List of Hawaii Five-0 (2010 TV series) characters

This is a list of fictional characters in the television series Hawaii Five-0, which has aired on CBS since 2010. The article deals with the series' main, recurring, and minor characters.

Full cast of Hawaii Five-0 season 8 from left to right: Jorge Garcia as Special Consultant Jerry Ortega, Chi McBride as Captain Lou Grover, Beulah Koale as Officer Junior Reigns, Meghan Rath as Officer Tani Rey, Scott Caan as Detective Danny Williams, Alex O'Loughlin as Lieutenant Commander Steve McGarrett, Ian Anthony Dale as Adam Nishomuri, Kimee Balmilero as Medical Examiner Dr. Noelani Cunha, Dennis Chun as Sergeant Duke Lukela, and Taylor Wily as Kamekona Tupola

Main

Name	Portrayed by	Seasons
		1	2	3	4	5	6	7	8	9
Steve McGarrett	Alex O'Loughlin	Main
Danny Williams	Scott Caan	Main
Chin Ho Kelly	Daniel Dae Kim	Main
Kono Kalakaua	Grace Park	Main
Mary Ann McGarrett	Taryn Manning	Also starring	Guest			Archive Footage	Guest
Dr. Max Bergman	Masi Oka	Recurring	Main
Lori Weston	Lauren German		Also starring			Archive Footage		Archive Footage
Catherine Rollins	Michelle Borth	Recurring		Main		Guest	Recurring	Guest
Lou Grover	Chi McBride				Also starring	Main
Jerry Ortega	Jorge Garcia				Recurring	Main
Tani Rey	Meaghan Rath								Main
Kamekona Tupuola	Taylor Wily	Recurring							Main
Duke Lukela	Dennis Chun	Recurring							Main
Dr. Noelani Cunha	Kimee Balmilero							Recurring	Main
Junior Reigns	Beulah Koale								Main
Adam Noshimuri	Ian Anthony Dale		Recurring						Main

Steve McGarrett

Main article: Steve McGarrett

Danny Williams

Danny Williams
First appearance	Pilot (episode 1.01)
Portrayed by	Scott Caan
Other appearances	NCIS: Los Angeles
In-universe information
Nickname	Danno (by Grace, Charlie, and Steve) Jersey (by Kamekona and Melissa) Haole (by Kamekona)
Title	Detective Sergeant
Occupation	Member of the Five-0 Task Force Detective, Honolulu PD (formerly) Police officer/detective, Newark PD (formerly)
Family	Eddie Williams (father) Clara Williams (mother) Matthew Williams (brother; deceased) Stella Williams Russo (sister) Bridgett Williams (sister)
Spouse	Rachel (ex-wife)
Children	Grace Williams (daughter) Charles Edwards (son)
Relatives	Eric Russo (nephew) unnamed niece unnamed nephew

Detective Sergeant Daniel "Danny" "Danno" James Williams is a member of the Five-0 Task Force and the de facto second in command. He is an experienced detective whose police background and tendency to go "by the book" clashes with McGarrett's "shoot now, talk later" style.

It is established in Season 1 that Danny was from New Jersey, presumably around the New York metropolitan area, and was only living in Hawaii because his ex-wife Rachel had remarried and moved there with their daughter Grace to join her new husband Stan Edwards. He transferred from Newark PD to the Honolulu PD to be closer to Grace. In the Pilot, Danny had moved to Hawaii six months ago and was a "greener than grass" homicide detective with the HPD when he was assigned the murder investigation of John McGarrett. He comes into contact with John's son Lieutenant Commander Steve McGarrett, then still on active duty, who returns home to Hawaii seeking revenge and intending to take over the investigation into the murder of his father. The Governor had requested the younger McGarrett to set up a task force and Danny was his first recruit. They then recruit Chin Ho Kelly and Kono Kalakaua to form the Five-0 Task Force.

Danny often rants to McGarrett about his dislike for everything Hawaiian, from pineapples on pizza to surfing etiquette, while McGarrett would mock his affinity for wearing ties and loafers at work, a practice not common in Hawaii. Regarded as a haole for being a non-Hawaiian and not following island customs during the first season, Danny is often viewed as a curiosity or with disdain by the locals and other HPD cops and the first season sees the rest of the team often having to explain to him the idiosyncrasies of life in Hawaii. For example, his insistence on wearing what he deemed to be "professional attire" (tie and loafers) and disregard for surf etiquette or Native Hawaiian culture is met with ridicule and light-hearted derision from his co-workers. He eventually stops wearing ties and, in the season 5 premiere, admits that he feels at home in Hawaii and views his Five-0 co-workers as his extended family.

The son of Eddie and Clara Williams, he comes from a large working-class family and is the second oldest of four children. He has a younger brother Matt and two sisters (one of whom is older sister named Stella), both of whom are married. It is implied through his conversations with McGarrett that Danny is close to his family, although the rift between him and Matt never closed due to Matt drifting towards the criminal side of the business world. In season 3 Stella sends her son Eric Russo, who had dropped out of college, to Danny in a desperate attempt to set him straight. Eric, who calls Danny "Uncle D", spends the day tailing the Five-0 team on a case involving college professor and his students and finds his calling in forensics after providing some valuable insights which led to the arrest of the perpetrator. He moves to Hawaii and begins working in the forensics lab from season 5 onwards.

Danny began his career as a police officer with the Newark PD. When he was a patrol officer, he testified against his training officer, Rick Peterson (Peter Greene), under a subpoena during Peterson's trial for corruption. He worked his way up to become a respected homicide detective with 87 convictions before transferring to the Honolulu Police Department. In 2001, he witnessed the murder of his partner Grace Tilwell by a pair of gangsters they had been sent to apprehend. After barely making it out alive, he notices smoke billowing from the World Trade Center and was later ordered to New York City to assist the NYPD. That day still haunts Danny and his daughter Grace was named after Tilwell. He often describes his time with the Newark PD as a "happy time" of his life as he was still happily married to Rachel and Grace was born. Danny is portrayed as a loyal cop who is married to his job first and life second. As a consequence, he is often at odds with his ex-wife Rachel for sometimes not being on time to pick up Grace. He is very loyal to his friends and colleagues, once refusing to believe that his former HPD partner Meka was corrupt even when pitted against overwhelming evidence after the partner was found dead under suspicious circumstances. Likewise, he often gives Steve the benefit of the doubt even when the latter resorts to more "unorthodox" methods in an investigation as he trusts Steve's judgment.

A running gag in the show is the regular "carguments" between Danny and McGarrett. Much of Danny's interaction with McGarrett outside work usually involves an argument on the way to and from a crime scene or when interviewing suspects, resulting in characters commenting about the duo being like an "old married couple". Their partnership even being referred to as a marriage by Danny (and several other characters), and him even calling McGarrett "babe" on several occasions. Their polar opposite personalities and work styles are often a source of both friction and banter. For example, McGarrett is extremely neat and organized, likely a result of his military days, whereas Danny tends to be a slob, as evidenced by the appearance of their offices and homes. Danny's "by-the-book" style contrasts with McGarrett's "the ends justify the means" approach (which Danny calls "shoot now, ask questions later"). Lou Grover once described Danny as "the brains" to McGarrett's "brawn". Indeed, by season 2, he adopts some of McGarrett's crude and unorthodox interrogation techniques, prompting Chin to comment that he has been "hanging out with McGarrett too long".

In "Hana Keaka", it is mentioned that Danny attended Seton Hall University where he minored in business, which made him the ideal candidate to go undercover at Oahu State University as an economics professor.

In "No Ke Ali'i' Wahine A Me Ka Aina", Danny and Steve, along with an MI-6 officer (Chris Vance) are awarded the George Cross by Queen Elizabeth II for stopping a terrorist attack against Europe.

Danny's pistol is an H&K P30 although he carried a SIG Sauer SP2009 in the pilot.

He is a passionate football fan and has mentioned that he is a fan of the New York Jets and Super Bowl–winning quarterback Peyton Manning.

Chin Ho Kelly

Chin Ho Kelly
First appearance	Pilot (episode 1.01)
Last appearance	"Ua Mau Ke Ea O Ka Aina I Ka Pono" / "The Life of the Land is Perpetuated in Righteousness" (episode 7.25)
Portrayed by	Daniel Dae Kim
Other appearances	NCIS: Los Angeles MacGyver
In-universe information
Nickname	Chin
Title	Detective Lieutenant
Occupation	Head of the SFPD Five-0 Task Force Member of the Five-0 Task Force (formerly) Police officer/Detective, Honolulu PD (formerly)
Family	Kam Tong Kelly (father, deceased)
Spouse	Malia Waincroft (deceased)
Relatives	Sara Malia Diaz Waincroft (Niece; Ward) Keako (uncle) Mele (aunt, deceased) Kono Kalakaua (cousin) Gabriel Waincroft (brother-in-law, deceased)

Lieutenant Chin Ho Kelly is the third member of Five-0. He was a former Honolulu Police Department police officer who left the force due to false allegations of corruption. He is close friends with the McGarrett family as his late father Kam Tong was a long-time colleague of John in the HPD while Chin was trained by John during his rookie days patrolling the beat. In the pilot episode he was recruited by Steve for the new task force and often serves as the team's technical expert and designated sniper alongside his cousin Kono. Throughout the show, he is often seen manipulating the smart board in the office or fiddling with all things digital. He was married to Dr. Malia Waincroft, his long-time on-and-off girlfriend.

Chin attended Kukui High School and was the star quarterback until McGarrett broke his records as a sophomore. After that season, McGarrett was sent off to a military school on the mainland. As a high school student, Chin was described as being multi-talented with a wide variety of interests, having played football and was also in the math club and school band. Little is known about his early career with the Honolulu Police Department except that he had been assigned to District 5 (in real life, covering the areas from Kalihi to Salt Lake) and that Steve's father John was his training officer. He rose to the rank of Detective Lieutenant before leaving over false allegations that he had stolen money from the evidence locker. From his resignation up until Steve's return to Hawaii, Chin was working as a security guard. It is eventually revealed that it was his uncle, a retired cop himself, who had done it out of desperation over the expenses for his cancer-stricken wife's treatments. Kono confronts Chin about it but he flatly refused to turn his uncle in for fear that it would cause all the cases his uncle had solved to be reopened and the criminals would be released. After it became known that the allegations against Chin were false, he was reinstated to his rank and his badge returned to him.

In the season 2 finale cliffhanger, Chin is put in a difficult position after a group of corrupt ex-HPD cops simultaneously hold Kono hostage and threaten Malia in the couple's own house as part of a plot to free Frank Delano from Halawa. He chose to save his wife but Delano still orders his men to kill both women. Kono, bound and gagged, was pushed into the sea but was rescued by Adam, who was hiding nearby. The paramedics were unable to save Malia and she dies at home.

It is revealed in Season 4 that Chin's father was murdered fifteen years ago by his brother-in-law Gabriel Waincroft, who grew up to become a notorious drug lord despite Chin's efforts to set him straight. At that time, Chin and Malia, then rookies in their respective occupations, were dating and Malia had asked Chin to talk to her wayward younger brother, then a known juvenile delinquent. Kam Tong happened to be at the wrong place at the wrong time when Gabriel was ordered to kill someone as part of his gang initiation. Years later, at Kono and Adam's wedding, Gabriel confronts Chin and tells him that while he was sorry that Kam Tong was the unfortunate victim of his gang initiation, he blamed Chin for failing to protect Malia.

Unlike the other Five-0 members, Chin often rides a motorcycle to work. It has been said that "everyone" knew who Chin was and his intimate knowledge of the island of Oahu and Hawaiian culture, rapport with the locals and ability to speak Hawaiian often aids the team when dealing with locals who are often suspicious of haole cops (such as Danny). His "street smarts" and local knowledge complements Danny's experience as a detective and McGarrett's tactical know-how.

In Season 6 Chin starts a relationship with Detective Abby Dunn and that continued throughout the course of the season in to Season 7.

At the end of Season 7, Chin is offered a chance to run the Five-0 Task Force that is being established by the San Francisco Police Department; it is revealed in the Season 8 premiere that he accepted.

Chin's pistol of choice is the SIG-Sauer P229R. He previously used the HPD standard-issue Smith & Wesson Model 5906. He also has a niece through his wife, named Sara Malia Waincroft.

Kono Kalakaua

Kono Kalakaua
First appearance	Pilot (episode 1.01)
Last appearance	"Ua Mau Ke Ea O Ka Aina I Ka Pono" / "The Life of the Land is Perpetuated in Righteousness" (episode 7.25)
Portrayed by	Grace Park
Other appearances	MacGyver
In-universe information
Title	Officer
Occupation	Member of the Five-0 Task Force (formerly) Professional surfer (formerly)
Family	Ke'ano Kalakaua (father) Nani Kalakaua (mother)
Spouse	Adam Noshimuri
Relatives	Keako (uncle) Mele (aunt, deceased) Chin Ho Kelly (cousin)

Officer Kono Kalakaua is a fresh HPD academy graduate who was recruited by Steve for the new task force in the pilot episode. She is the cousin of Chin Ho Kelly. Despite her slight frame, she is well-versed in martial arts and is a skilled marksman (she is usually the designated sniper when the situation requires one).

Kono was a former professional surfer but a serious injury to her knee ended her career. She decides to join the "family trade" and was days away from graduating from the HPD academy when McGarrett recruited her for the new "Governor's Task Force", as Five-0 was initially called. In the first several episodes of season 1, she works under the watchful eye of her cousin and quickly wins the trust and confidence of the other team members. She is detained and questioned by the HPD, having been accused of stealing $10 million from an HPD asset forfeiture locker. While on suspension, she helps Chin and Danny go after Wo Fat, who was responsible for framing McGarrett for the murder of the Governor. To the members of the Five-0 task force and to the general public, Kono had been stripped of her badge by the Internal Affairs Department of the HPD, but it was later revealed to be a ploy for her to go undercover to bust a string of dirty ex-cops.

In Season 2, Kono began a relationship with Hiro Noshimuri's son, Adam. When Adam's brother, Michael, is released from prison, he kills someone with Kono's gun to frame her. She is cleared, but Adam has to kill Michael to protect her and Kono goes into hiding with Adam, skipping from one place to another to evade capture by vengeful yakuza members. At the beginning of Season 5, Adam starts to talk about marriage, and in the episode "Blackout" Kono accepts his proposal. They marry at the end of the season, but in the Season 6 pilot they are tortured by Chin's brother-in-law, Gabriel, who runs away with Adam's money. The money was to pay the yakuza to free Adam from his past. Without the money the yakuza's men persecute Adam and he is forced to kill them before discovering that Gabriel has paid off his debt with the yakuza. Upset, Adam goes to the police with Kono and he accords for an 18 months reclusion.

At the end of Season 7, Kono left Hawaii for Carson City, Nevada where she joined a multi-agency task force combating sex trafficking. In the season 8 episode I Ka Wa Ma Mua, I Ka Wa Ma Hope (The Future is in the Past) Danny dreams of the future and Kono has a child with Adam.

Mary Ann McGarrett

Mary Ann McGarrett
First appearance	Pilot (episode 1.01), (Deleted Scene) "Lankila" / "Victory" (episode 1.04), (Series Regular)
Last appearance	"Ke Kinohi" / "The Beginning" (episode 1.13), (series regular) "Ua ola loko i ke aloha" / "Love Gives Life Within" (episode 6.12), (Guest Star)
Portrayed by	Taryn Manning
In-universe information
Occupation	Flight Attendant (former) Caretaker (former)
Family	Steve McGarrett (Brother) John McGarrett (Father), (deceased) Doris McGarrett (Mother)
Children	Joan McGarrett (Adoptive Daughter)
Relatives	Debora McGarrett (Aunt), (deceased) Steven McGarrett (Grandfather), (deceased)

Mary Ann McGarrett is the younger sister of Steve McGarrett. She, along with her brother, were both sent to the mainland after their mother was (presumably) murdered. Steve went to the Army and Navy Academy in Carlsbad, California while she lived with their Aunt Deb several hours away. As a result, both siblings had harbored resentment over their father splitting up the family and drifted apart over the years; in the episode "Lanakila", she comments to her brother that the last time they met in person was at their mom's funeral over fifteen years ago. She is the "black sheep" of the family, wandering from job to job, and was said to be living in Los Angeles when Steve returns to Hawaii for good. In a scene deleted from the Pilot episode, Steve mentions bailing her out of trouble more than once and keeping it from their father to "let Dad go to his grave believing that you were his perfect little girl". She takes a job as a flight attendant but quit after her so-called friend Angela had betrayed her and took advantage of her naivete to be a mule for trafficking blood diamonds. In season 3 Mary returned to Hawaii working as a caretaker, originally not wanting to reconnect with Doris she later meets her after strong encouragement from Steve and the person she was caring after.

In season 4, Mary adopts a baby girl and names her Joan, after her father. Steve was initially against it but he comes to accept Joan after being forced to babysit her for the day. Since then, Mary and Steve have reconnected and she regularly sends him videos of Joan.

In the original show, Mary Ann only appeared in a two-episode arc. She was also estranged from her brother and was married and had an infant son who died of cancer. She was portrayed by Nancy Malone. In the reboot, the character features more in Steve's life and reconnected with him.

Dr. Max Bergman

Max Bergman
First appearance	"Nalowale" / "Forgotten/Missing" (episode 1.05), (Guest Star) "Haʻiʻole" / "Unbreakable" (episode 2.01), (Series Regular)
Last appearance	"Ua ho'i ka 'opua i Awalua" / "The Clouds Always Return to Alawua"" (episode 7.13)
Portrayed by	Masi Oka
In-universe information
Title	Doctor
Occupation	Chief Medical Examiner
Family	Mr. & Mrs. Bergman (adoptive parents)
Spouse	Sabrina Lane
Relatives	Machiyo Takeshita (Biological Mother)(deceased)
Religion	Judaism

Dr. Max Bergman is the Chief Medical Examiner. Bergman was initially billed as a recurring character but Oka joined as a series regular and has been part of the main cast since Season 2.

Dr. Bergman was first introduced to Five-0 by Governor Jameson. He was playing the piano and then wordlessly proceeded to explain the victim's cause of death to Danny and McGarrett, before finally greeting them and introducing himself. He has the tendency to rattle off trivia, prompting the Five-0 team to cut him off and tell him to get to the point. Danny often mocks him with medical jokes. Despite his lack of social skills, he does get along with the other members of Five-0. He has a Halloween tradition of dressing up as a character from a Keanu Reeves film.

In the season 2 episode "Haʻalele", it is revealed that his biological mother, Machiyo Takeshita, was murdered by the notorious "Trashman", a serial killer in Hawaii in the 1980s who earned the nickname because his victims were all found in trash bags or the dumpster. He was born to a Japanese-American mother but adopted by a Jewish family, the Bergmans, after a short stint in foster care, hence his last name. As an undergraduate at Arizona State University, he was a self-confessed party boy and earned the nickname "Beerman".

Dr. Bergman is dating Sabrina Lane, a bank teller at Hawaii National Bank. He first saw her in the episode "Haʻawe Make Loa / Death Wish" while at the bank and had a crush on her at first sight. A botched bank robbery took place minutes later resulting in Sabrina being shot and Dr. Bergman having to put his medical expertise to use while being held hostage. Following the incident, he eventually works up the nerve to ask her out. It is implied that they are in a relationship (as of Season 6 Episode 14) as she is mentioned by Dr. Bergman numerous times in conversations with other members of Five-0; Rumer Willis, who portrays Sabrina, has only appeared twice on the show. It is revealed in the season 7 episode "Ka hale ho'okauwel / House of Horrors" that he married Sabrina during his sabbatical.

Max retired from the Honolulu Medical Examiner's Office and from Five-0 in the season 7 episode "Ua ho'i ka 'opua i Awalua" and returned to Africa as a member of Doctors Without Borders.

Lori Weston

Lori Weston
First appearance	"Ua Lawe Wale" / "Taken" (episode 2.02), (Guest Star) "Maʻemaʻe" / "Clean" (episode 2.05), (Series Regular)
Last appearance	"I Helu Pu" / "The Reckoning" (episode 2.16), (Series Regular) "Ua ho'i ka 'opua i Awalua" / "The Clouds Always Return to Awalua" (episode 7.13), (Archive Footage)
Portrayed by	Lauren German
In-universe information
Title	Special Agent
Occupation	Special Agent, DHS Special Agent/Profiler, FBI (formerly)

Special Agent Lori Weston is a former DHS agent with a background as a profiler. Due to the circumstances of her assignment McGarrett initially views her with suspicion and assigns her to "babysit" the victim's parents in a kidnapping case on her first day on the job. A graduate of Pennsylvania State University, her background as a federal agent proves to be an asset, as she is able to take down suspects and quickly proves her worth. She returns to the DHS at Governor Denning's request when Five-0 get tangled in an incident with an employee of the Russian consulate.

As Catherine Rollins was deployed, she spends a lot of time with McGarrett, but the latter regards her a good friend rather than a romantic interest. She had developed a crush on him, but realizes that McGarrett has always been in love with Catherine. Before her departure, she hands him the UH season tickets she had bought.

Catherine Rollins

Catherine Rollins
First appearance	"Lanakila" / "Victory" (episode 1.04), (Guest Star) "La O Na Makuahine" / "Mother's Day" (episode 3.01), (Series Regular)
Last appearance	"O ka PiliʻOhana ka ʻOi" / "Family Comes First" (episode 4.21), (Series Regular) "He Lokomaika’I Ka Manu O Kaiona" / "Kind Is the Bird of Kaiona" (episode 8.20), (Guest Star)
Portrayed by	Michelle Borth
In-universe information
Nickname	Cath
Title	Lieutenant
Occupation	Member of the Five-0 Task Force (inactive) Private investigator (formerly) United States Navy officer (formerly)
Family	Unnamed parents

Lieutenant Catherine "Cath" Rollins, USN (Ret.) is the on-off lover of Steve McGarrett. How or when they met is never fully explained, but it has been implied that they have known each for a long time. It is likely they would have had to keep their relationship a secret due to strict fraternization rules in the U.S. military and the fact that McGarrett outranked her.

Cath is a "Navy brat" and moved around frequently due to her father's various assignments. During Pro Bowl weekend, when asked why she supported the Dallas Cowboys, she explained that had never stayed in any one place long enough to feel an affinity for an NFL team. She herself joined the Navy and is an Intelligence Officer. Like McGarrett, her military service record remains vague. She previously dated Billy Harrington, one of McGarrett's SEAL buddies whom she had worked with.

Cath is first introduced in the Season 1 episode "Lanakila", when McGarrett calls her for "a favor". Later in the season, she stays with him while on leave, resulting in Danny commenting on how McGarrett had "that stupid smile" despite being called in on a Saturday to work a murder-abduction case.

In the season 4 episode "Makani ʻolu a holo malie/Fair Winds and Following Seas", Cath persuades McGarrett to go with her to Afghanistan to find a young boy named Najib. Najib's father had saved her when she was injured and separated from her unit while deployed to Kabul. McGarrett was captured by Taliban insurgents and is nearly beheaded but a team of Navy SEALs rescue him in the nick of time. As a result, he escapes a court-martial and returns stateside with a stern warning that "these rogue ops of yours are over". Cath decides to remain in Afghanistan to continue her search for Najib and bids a tearful goodbye to McGarrett over the satellite phone. It was implied that McGarrett never really moved on, as he never indicated any interest in any of the women Danny or Ellie Clayton attempted to set him up with.

Cath makes a surprise return in the season 5 finale for Kono and Adam's wedding. Steve welcomes her with a hug when she surprises him at his backyard. She remained for the first three episodes of the series sixth season however she leaves once again before Steve is able to propose, saying that she had something to do. A heartbroken Steve tells her that he could not wait for her any longer if she decides to leave again, and she departs in tears. However, she makes a call to an unidentified person stating that Steve believed her story and that she was "ready". She once again returned in the series seventh season for the shows 150th episode to inform Steve that his mother had been detained following an attempt to break Wo Fat's father out of prison. She assists Steve and the rest of the Five-0 Task Force in rescuing Doris McGarrett and Wo Fat's father. She returns again in the eighth season's twentieth episode, getting Steve's help once again to find someone making dirty bombs out of an unused military bunker's depleted uranium.

Awards and decorations

The following are the awards and decorations worn by Lt. Rollins.

Personal decorations Navy & Marine Corps Commendation Medal, w/1 gold award star (2nd award) Navy & Marine Corps Achievement Medal, w/1 gold award star (2nd award) Unit awards Navy Unit Commendation, w/1 bronze service star (2nd award) Meritorious Unit Commendation Campaign and service medals National Defense Service Medal Armed Forces Expeditionary Medal, w/1 bronze service star (2nd award) Global War on Terrorism Expeditionary Medal Global War on Terrorism Service Medal Service and training awards Sea Service Deployment Ribbon, w/1 bronze service star (2nd award) Marksmanship awards Navy Expert Pistol Shot Medal

Other accoutrements Surface Warfare insignia

In "Kaʻoia iʻo Ma Loko", Catherine is honorably discharged from the United States Navy and is awarded her second Navy and Marine Corps Achievement Medal as an end-of-tour award.

Lou Grover

Lou Grover
First appearance	"Aloha Ke Kahi I Ke Kahi" / "We Need Each Another" (episode 4.01), (Guest Star) "Hoʻonani Makuakane" / "Honor Thy Father" (episode 4.10), (Series Regular)
Portrayed by	Chi McBride
In-universe information
Title	Captain
Occupation	Member of Five-0 Task Force Head of SWAT, HPD (formerly) Head of SWAT/police officer, CPD (formerly)
Spouse	Renée Grover
Children	Will Grover (son) Samantha Grover (daughter)

Captain Louis Purnell "Lou" Grover is the former head of the Honolulu Police Department SWAT Team. He was often at loggerheads with McGarrett over what he felt was Five-0's tendency to be trigger-happy with armed suspects and refusal to obey a "wait for SWAT" order, to the point where he lodges an official complaint with Governor Denning. The Governor dismissed Grover's complaint and then promptly orders the duo on an assignment to serve a warrant for a computer hacker. By the latter half of Season 4, he is fully accepted into the Five-0 ohana. In the season 4 finale, Grover's actions to rescue his daughter result in forced early retirement from HPD, but also allows McGarrett to recruit him to be part of the Five-0 team, which he accepts. The character was named after a Captain Grover (Scott Brady) from the original series.

A 25-year veteran of the force, Grover graduated from the Chicago Police Academy in 1989, and was promptly recruited by the FBI to go undercover in the Philadelphia Black Mafia. Upon the completion of the assignment, he returned to the Chicago Police Department. He left Chicago around 2012 or 2013, after an incident where he blames himself for having failed to save a boy who was taken hostage by his father, which ultimately resulted in a murder-suicide.

He and his wife Renée (portrayed by Michelle Hurd) have two adolescent children: daughter Samantha (portrayed by Paige Hurd) and son Will (portrayed by Chosen Jacobs). The Grovers are a close-knit family and Lou is shown to be a doting father who is fair but firm with his children. As Danny also has a daughter, Grover sometimes gives him tips and unsolicited advice on dealing with preteens. Although he loves his wife and vice versa, he has a tendency to forget important dates such as birthdays, anniversaries and Valentine's Day. In season 6, he forgets about Valentine's Day and hastily makes plans but Renée saw through it and he ends up in the doghouse as a result. The Grovers live in the Honolulu neighborhood of Manoa.

Despite Grover's rocky introduction to the Five-0 team, he has since become a valued member of the team. He has an ongoing good-natured rivalry with McGarrett. McGarrett would light-heartedly joke about Grover being a "city boy" out of his element on a tropical island while Grover would poke fun about McGarrett getting himself into trouble because of his refusal to ask for help. Unlike McGarrett, Danny Williams took longer to accept Grover but they bond over the fact that they are the only members of the team with children and would often vent their frustrations to one another about parenting issues. Their friendship becomes slightly awkward after both discover that Will and Grace had been dating behind their backs.

Grover's weapon of choice is the Kimber Custom TLE II.

Jerry Ortega

Jerry Ortega
First appearance	"Kaʻoia iʻo Ma Loko" / "The Truth Within" (episode 4.03), (Guest Star) "Aʻohe Kahi e Peʻe Ai" / "Nowhere to Hide" (episode 5.01), (Series Regular)
Portrayed by	Jorge Garcia
In-universe information
Title	Special Consultant
Occupation	Five-0 Task Force
Family	Unnamed father (deceased) Unnamed mother Isabel Ortega (younger sister)

Jerry Ortega is a conspiracy theorist who lives in his mother's basement (until she moves to Maui) who regularly assists the Five-0 Task Force with various cases. He was first introduced in the episode "Ka 'oia'i'o ma loko / The Truth Within". Jerry was classmates with Chin Ho Kelly at Kukui High and they were in the school band. A running gag in the show is the fact that he is either resistant or reluctant to use cellular technology to communicate with McGarrett (e.g. he once used a rotary phone to directly call McGarrett about updates for a case) and tends to ramble about conspiracies over everything. The Five-0 team largely tolerate and humor him as more often than not, his conspiracy theorist ramblings provide the team with a lead or valuable insight into a case. After much pestering, in season 6, McGarrett finally lets Jerry have his own "office"—an empty file storage room in the basement—and officially hires him as a "consultant".

Jerry is a fan of Elvis Presley, which was discovered when Five-0 was called to investigate a murder of an Elvis impersonator in the episode "Ua heleleʻi ka hoku / Fallen Star". In the same episode he shows off his musical talent by singing at the open mic when hanging out with the team for drinks after the case. While his job officially is a consultant, he operates behind the scenes as a technical operator, often providing information about the cases Five-0 investigates or technical support when they are in the field. In the episode 'Ua Malo'o Ka Wai', Jerry is awarded his very own Five-0 badge after he coordinates with Duke Lukela and HPD to rescue Five-0 from the Yakuza.

Tani Rey

Tani Rey
First appearance	"A'ole e 'olelo mai ana ke ahi ua ana ia" / "Fire Will Never Say that It Has Had Enough" (episode 8.01)
Portrayed by	Meaghan Rath
In-universe information
Title	Officer
Occupation	Police academy recruit (former), Lifeguard (former), Five-0 Task Force

Tani Rey was first introduced in the season 8 premiere as a lifeguard who was kicked out of the police academy for cheating. Steve asks her to go undercover to assist Five-0 on a case. She originally turned him down however she later changed her mind and eventually became an officer on the Five-0 Task Force. She cares deeply about her family even saving her brother from an HPD raid moments before he would've been arrested.

Kamekona Tupuola

Kamekona Tupola
First appearance	Pilot (episode 1.01), (Guest Star) "A'ole e 'olelo mai ana ke ahi ua ana ia" / "Fire Will Never Say that It Has Had Enough" (episode 8.01), (Series Regular)
Portrayed by	Taylor Wily (Jovan Armand as a teenager)
Other appearances	MacGyver Magnum P.I.
In-universe information
Title	Owner
Occupation	Waiola Shave Ice Kamekona's Shrimp Truck Kamekona's Helicopter Tours
Family	Maya Tupuola (Mother) Kanoa Tupuola (Brother)
Relatives	Flippa Tupuola (Cousin) Thomas Hoapili (Cousin) Maggie Hoapili (Niece)

Kamekona Tupuola is the owner of Waiola Shave Ice, Kamekona's Shrimp Truck and Kamekona's Helicopter Tours. Kamekona comes from a typically large Polynesian family and often mentions various relatives whenever one of the members of Five-0 needs a favor, whether for a personal matter or for an investigation. His late cousin, Thomas Hoapili, was a master of Kapu Kuʻialua, an ancient Hawaiian martial art, as is Thomas's daughter, Maggie (portrayed by Summer Glau). Another cousin, Flippa (Shawn Mokuahi Garnett), often helps Kamekona at the shrimp truck.

Kamekona was introduced in the Pilot as Chin's confidential informant and owner of a shave ice stall on the beach. His full background and how he first met Chin were only revealed in the season 6 episode "Kuleana / One's Personal Sense of Responsibility". As the elder son in an impoverished family, he would skip school to earn extra money to help his single mother. He gradually became a drug kingpin and did some time at Halawa. As a result of his younger brother's involvement with a noted drug dealer, whom Chin Ho Kelly was coincidentally investigating, he agreed to be a CI for the HPD on the condition his brother is let go without any charges. Chin visits Kamekona in prison and gives him Napoleon Hill's book Think and Grow Rich, beginning a friendship that continues to the formation of Five-0. He started his shave ice stand while getting back on his feet after being released. In the season 5 finale, he mentioned that his shrimp truck business is now in doubt, after Steve and Danny dropped a nuke into the sea to prevent it from blowing up on land. In season 3 he qualifies as a helicopter pilot with the help of McGarrett. Members of the Five-0 Task Force and their families are often seen patronizing his shrimp truck or asking him for favors (e.g. he babysat Grace Williams, Danny's daughter, and chaperoned Steve's sister Mary while they were at work).

Duke Lukela

Duke Lukela
First appearance	"Hana 'a'a Makehewa" / "Neighbor" (episode 1.12), (Guest Star) "A'ole e 'olelo mai ana ke ahi ua ana ia" / "Fire Will Never Say that It Has Had Enough" (episode 8.01), (Series Regular)
Portrayed by	Dennis Chun
In-universe information
Title	Sergeant
Occupation	HPD
Spouse	Nalani

An HPD Sergeant who often acts as a liaison to Five-0. He was one of the few HPD cops who was not antagonistic towards Danny or the other Five-0 members from the beginning, as he was colleagues with Steve's father and many of Chin and Kono's family members (they come from a family of cops). In "Hookman", he was shot by Curt Stoner (Peter Weller), but survived and recovered. He is married to Nalani (portrayed by Chun's real-life partner Laura Mellow).

Chun is the son of Kam Fong Chun, who played Chin Ho Kelly on the original Hawaii Five-O. The character Duke Lukela was portrayed by Herman Wedemeyer in the original series.

Noelani Cunha

Noelani Cunha
First appearance	"Makaukau 'oe e Pa'ani?" / "Ready to Play?" (episode 7.01), (guest star) "A'ole e 'olelo mai ana ke ahi ua ana ia" / "Fire Will Never Say that It Has Had Enough" (episode 8.01), (series regular)
Portrayed by	Kimee Balmilero
Other appearances	Magnum P.I.
In-universe information
Title	Doctor
Occupation	Medical examiner

Noelani was first introduced in season 7 working with Dr. Max Bergman as a medical examiner. Following his departure in season 7 Noelani took his place.

Junior Reigns

Junior Reigns
First appearance	"Na La 'Ilio" / "Dog Days" (episode 8.02), (series regular)
Portrayed by	Beulah Koale
In-universe information
Title	Officer
Occupation	Five-0 Task Force

Junior Reigns first introduced in the second episode of the eighth season. Junior came to Steve looking for a job on the Task Force. Steve initially turned him down however after Junior insists Steve tells him that before becoming a part of Five-0 he must finish the police academy. Junior eventually receives his badge and joins Five-0.

Adam Noshimuri

Adam Noshimuri
First appearance	"Pahele" / "Trap" (episode 2.11), (Guest Star) "Kau Ka ‘Onohi Ali’i I Luna" / "The Royal Eyes Rest Above" (episode 8.07), (series regular)
Portrayed by	Ian Anthony Dale
In-universe information
Title	Confidential Informant
Occupation	Head of Five-0 Task Force Special Division of Organized Crime Former head of the Japanese Yakuza
Family	Hiro Noshimuri (father) (deceased) Michael Noshimuri (brother) (deceased)
Spouse	Kono Kalakaua
Relatives	Noriko (half-sister)

Adam Noshimuri, Kono's husband who becomes a new head of the Japanese Yakuza after Wo Fat murders his father, Hiro. First introduced in the season 2 episode "Pahele / Trap", he has been trying to legitimize and clean up his organization with the intention of distancing himself from his father's criminal past. When he and Kono first started dating, the Five-0 team were extremely suspicious of him, particularly Steve and Chin – the former due to his father's history with the yakuza and the latter due to him seeing Kono as a younger sister. He is accepted into the Five-0 ohana after proving his love for Kono. After killing his brother Michael (Daniel Henney) to protect Kono, he and Kono leave Hawaii and go into hiding. He comes out of hiding after his brother's loyalists are no longer a threat. At the beginning of Season 5, Adam proposes to Kono and at the end of this season they marry. In "Mai ho`oni i ka wai lana mālie", Adam is shot by Gabriel Waincroft, who runs away with the money that Adam would use to distances himself from the Yakuza. Almost immediately after Adam killed two Yakuza thugs in "Piko Pau 'iole" to save himself and Kono, Gabriel buys off Adam's debt in order for his cartel to team up with the head of the Hawaiian Yakuza. He subsequently turns himself in to the Honolulu Police Department. After a short legal battle he is sentenced to 18 months in prison, which was agreed on since he had been acting in self-defense. He has been released on parole as of the season 7 episode "Ka 'Aelike / The Deal".

Adam is the elder son of Hiro Noshimuri and, with the introduction of his brother Michael, it becomes apparent that Adam was the brains who ran the legitimate business front of their father's operation out of New York while Michael was the brawn who usually took care of the "dirty" side. For example, when the Five-0 team uncover a yakuza burial site, it is revealed that he knew nothing about it. He is implied to be a Nisei (first generation American-born Japanese American) and his grandfather served in the Imperial Japanese Navy.

Dale was initially confirmed for a four-episode arc but following positive fan response, became a recurring guest star. His character had been written as a potential antagonist for McGarrett and the team as he saw the latter as a stumbling block in his quest for answers about his father's death. Like his character, Dale is of Japanese descent.

In the season 8 episode I Ka Wa Ma Mua, I Ka Wa Ma Hope (The Future is in the Past) Danny dreams of the future and Adam has a child with Kono. In the Season 8 episode Ka Hopu Nui 'Ana (The Round Up), after a devastating hit on Hawaii's crime bosses by a new crime syndicate, Steve asks Adam to head up a new special division within the Five-0 Task Force to focus specifically on organized crime.

Recurring

Name	Portrayed by	Seasons
		1	2	3	4	5	6	7	8
John McGarrett	William Sadler (2010-15; seasons 1-5)	Guest
	Ryan Bittle (2018; season 8)								Guest
Doris McGarrett	Christine Lahti			Special Guest Star		Archive Footage		Special Guest Star
Debora "Deb" McGarrett	Carol Burnett				Guest
Grace Williams	Teilor Grubbs	Recurring
Charlie Williams	Zach Sulzbach					Guest	Recurring
Will Grover	Chosen Jacobs						Recurring
Rachel Edwards (2010-2017) Rachel Hollander (2017-present)	Claire van der Boom	Recurring	Guest			Guest		Guest
Malia Waincroft	Reiko Aylesworth	Guest	Recurring	Guest		Archive Footage
Jenna Kaye	Larisa Oleynik	Recurring				Guest
Abby Dunn	Julie Benz						Recurring	Guest
Pat Jameson	Jean Smart	Recurring
Laura Hills	Kelly Hu	Recurring
Michael Noshimuri	Daniel Henney			Recurring
Joe White	Terry O'Quinn		Recurring	Guest					Guest
Mamo Kahike	Al Harrington	Guest
Samuel "Sam" Denning	Richard T. Jones		Recurring			Archive Footage
Nahele Huikala	Kekoa Kekumano					Recurring
Dr. Charles "Charlie" Fong	Brian Yang	Recurring
Ellie Clayton	Mirrah Foulkes					Recurring
Eric Russo	Andrew Lawrence			Guest			Recurring
Pua Kai	Shawn Anthony Thomsen			Guest	Recurring

Family members

John McGarrett

Portrayed by William Sadler and Ryan Bittle

Sergeant John McGarrett, HPD (Ret.) (1942-2010) is the father of Steve and Mary Ann McGarrett and (presumed) widower of Doris McGarrett. His own father, Ensign Steve McGarrett, was killed in action on the U.S.S. Arizona (BB-39) during the attack on Pearl Harbor and John was born three months later on March 15. John would follow in his father's footsteps into the navy, serving in the Vietnam War and reaching the rank of Lieutenant before becoming a Honolulu Police Department detective. After Doris' presumed death, he launched his own investigation and sent Steve, then a high school junior, to board at the Army and Navy Academy in Carlsbad, California and Mary to live with his older sister Deb, who lived several hours away from Steve's new school, for their safety. It is presumed that this was the last time the siblings ever saw him in person as they became estranged from their father for sending them away; Steve only learns the real reason why his father split up the family when he returns to Hawaii to head the new task force following John's murder. In light of the revelation, Steve and Mary were able to let go of their animosity and are often seen visiting his grave site.

John has been mentioned a number of times as Steve regularly works with HPD officers, many of whom were John's former colleagues. Even renowned diamond smuggler and fence August March (Ed Asner) paid tribute to John's sense of integrity by telling Steve about how John turned down his $100,000 bribe over three decades ago.

John McGarrett was murdered by Victor Hesse on September 20, 2010, as witnessed by Steve, who was overseas on a highly classified mission in South Korea, via satellite phone. He was buried at the National Cemetery of the Pacific with full military honors. In the 100th episode "Ina Paha" ("If Perhaps") he is never murdered by Hesse and is able to reconnect with Steve when he returns home.

Doris McGarrett

Portrayed by Christine Lahti

Doris McGarrett is the wife of the late John McGarrett and mother of Steve and Mary Ann McGarrett. She was presumably murdered by a car bomb when Steve was aged fifteen or sixteen. It is revealed in Season 3 that she was a former CIA operative who went by the alias "Shelburne" and had faked her own death as a cover to escape underground in order to protect her family.

In the Season 3 premiere, Joe White brings Steve to Suruga Bay in Japan where mother and son are reunited. Steve was hostile to his mother, even refusing to call her "Mom", due to the years of resentment over how the family was torn apart by her supposed death and watching his father grieve over her. Mary also initially refused to see her after learning the truth from Steve. For the rest of the season she constantly refuses to tell everything to Steve and he does not fully trust her. He sends Cath to "babysit" her at a safehouse but Wo Fat bypasses the security system and Cath into the house to confront Doris. Despite being a crack shot and armed, ballistic evidence showed that she had intentionally shot away from him, which she attributed to her nerves and shock over Wo Fat's sudden appearance, but Steve refuses to believe her story. In the third-season finale she leaves Hawaii with Kono and Adam to help them evade the Yakuza with her promising to Steve that her story is "To be continued.". Over the next two seasons, bits and pieces (and rumors) of Doris' connection to Wo Fat are revealed. Steve only learns the full truth after he was abducted and tortured by Wo Fat in the 100th episode. She is mentioned in the episode "Pono Kaulike / Justice for All" where she uses her contacts to keep her son safe from a rogue CIA agent who attempts to have Danny and Chin framed to cover his tracks. Steve was able to use the information she provided to Joe White to exonerate his co-workers. In the seventh seasons 150th episode Steve learns from Catherine that she was captured after attempting to break Wo Fat's father out of prison. Steve and Catherine along with the rest of the team (excluding Danny) go to Morocco to break her and Wo Fat's father out.

Aunt Deb

Portrayed by Carol Burnett

Debra "Deb" McGarrett is the late older sister of John McGarrett and aunt of Steve and Mary Ann McGarrett. She raised Mary when John had sent the kids away from Hawaii for their safety after Doris was presumed to be murdered by a car bomb. Steve and Mary both see her as a maternal figure and she, having never married or had children, treats them as her own. Deb had been a struggling singer on the cusp of a big break when she left a promising career to raise Mary. In season 4, she pays Steve a surprise visit for Thanksgiving and reveals that she had stage four cancer. In season 5, she agrees to go for chemotherapy and her brain tumor has shrunk. She marries Leonard Cassano (Frankie Valli), a retired defense lawyer with stage four leukemia whom met during chemo. In the episode "Ua Ola Loko I Ke Aloha / Love Gives Life Within" she returns to Hawaii with Leonard's ashes on the pretext of spending time with Steve, Mary and Joan but does not tell them that she was actually dying and trying to complete her bucket list. She passes away peacefully in Steve and Mary's childhood home (which Steve has lived in since his father's death) after fulfilling all but one thing on her bucket list—climb a tall mountain. Steve and Mary complete her list by scattering her ashes on the mountain top.

Grace Williams

Portrayed by Teilor Grubbs and portrayed by Erika Brown as an adult.

Grace Williams is the daughter of Danny Williams and Rachel Edwards. Her parents divorced in the timeline before the pilot and she moved to Hawaii with her mother and millionaire new stepfather. She attends the Academy of the Sacred Heart, a fictional private school, and participates in the cheerleading team. She calls her father "Danno" and is the only person he unconditionally allows to call him that; McGarrett would mock Danny using the nickname or with the tagline "Book 'em, Danno", much to Danny's exasperation. Grace is named after a former partner of her father's who was killed in the line of duty by a criminal.

Grace is well-liked by the rest of the Five-0 ohana. She took to "Uncle Steve", as she calls McGarrett, who affectionately calls her "Gracie". Whenever Danny was unavailable due to extenuating circumstances, McGarrett would be the one to pick her up from school or personally reassure her.

Grace was often the source of Danny's disputes with his ex-wife over his visitation rights. Rachel would use their daughter as leverage and make empty threats about rescinding or lessening his visitation days. Eventually, Danny takes the matter to court and is awarded joint custody, meaning that Grace cannot move away from Hawaii without Danny's approval.

As of season 7 Grace is dating Will Grover, Lou's son. In the season 8 episode "I Ka Wa Ma Mua, I Ka Wa Ma Hope" ("The Future is in the Past") Grace is shown as an adult marrying Will.

Charlie Williams

Portrayed by Zach Sulzbach and portrayed by Joey Defore as an adult.

Charlie is the second child of Danny and Rachel. Charlie was originally thought to be the son of Stan however it was revealed in season 5 that Danny is the true father. In the season 8 episode I Ka Wa Ma Mua, I Ka Wa Ma Hope (The Future is in the Past) Charlie is an adult and has become a member of the Honolulu Police Department. He is then offered a job by Tani Rey the now leader of the Five-0 Task Force.

Will Grover

Portrayed by Chosen Jacobs

Will Grover is the son of Lou Grover. Although not seen until season 6 he moved to Hawaii with his father, mother, and sister. He attends Academy of the Sacred Heart with Grace Williams. Will and Grace are often seen spending time together doing activities such as homework, eating breakfast, and dancing. As of season 7 Will is dating Grace. In the season 8 episode I Ka Wa Ma Mua, I Ka Wa Ma Hope (The Future is in the Past) Will is an adult is marrying Grace.

Rachel Edwards/Hollander

Portrayed by Claire van der Boom

Danny's ex-wife and mother of Grace and Charlie. She moves to Hawaii after marrying millionaire Stan Edwards. Early in Season 1, she and Danny are often seen bitterly arguing on the phone to the point where the whole team knew about the feud even before they had met Rachel or Grace in person. She often used Grace as leverage and threatened to further limit his visitation rights when his job prevented him from being punctual to their father-daughter dates but Danny successfully files for joint custody, meaning that Grace cannot leave Hawaii without his consent. They are now on friendly terms, particularly after her marriage with Stan hits a rocky patch and Danny was there to help with Charlie's birth (which he later discovers was actually his, not Stan's). In the seventh season of the series Rachel divorces Stan and takes her maiden name once again.

Malia Waincroft

Portrayed by Reiko Aylesworth

Chin's wife, Dr. Malia Waincroft was previously engaged to Chin before he broke up with her after losing his badge. The two reconnected after he joined Five-0, and then resumed their relationship. She marries Kelly in the episode "Alaheo Pauʻole / Gone Forever", but dies in "La O Na Makuahine", the third-season premiere episode, from injuries sustained after she was shot, leaving Chin devastated. She had a brother named Gabriel Waincroft who was revealed to be responsible for the murder of Chin's father 15 years earlier.

Other

Jenna Kaye

Portrayed by Larisa Oleynik

Jenna Kaye is an ex-CIA analyst, assistant to Five-0. She is later revealed to be an associate of Wo Fat. At the end of "Ha'i'ole", she is seen driving Wo Fat away from the prison after he murdered Victor Hesse. She leaves Five-0 to follow up on a lead that her fiancé, Josh, who she claimed had been killed by Wo Fat, might in fact be alive and asks Steve to go with her to North Korea to get him. It turns out to be a trap for McGarrett, from Wo Fat telling Jenna he would release Josh if she brought him McGarrett, explaining her association with him. Jenna later discovers that Josh had been dead the entire time and that it was also a trap for her. She is able to tell McGarrett she is sorry for setting him up and gives him a pin from Josh's knee repair to help him escape, moments before Wo Fat shoots and kills her. In the 100th episode she is seen in the same episode that Victor Hesse is in looking for her fiancé who was in a motorcycle accident.

Detective Abby Dunn

Portrayed by Julie Benz

Abby Dunn is a Detective for the HPD and is the girlfriend of Chin Ho Kelly. She held the rank of Inspector at the San Francisco Police Department and was temporarily assigned to the Five-0 task force as SFPD intended to start a similar task force. However, it is revealed that she had been forced by an FBI agent with a grudge against Five-0 to tail them and find a reason to shut the task force down. She discloses this information to Chin after starting a relationship with him and resigns from the SFPD as well as Five-0, transferring to the HPD to become a detective.

Governor Pat Jameson

Portrayed by Jean Smart

Pat Jameson was the Governor of Hawaii in Season 1. When Steve McGarrett returned home to Hawaii to bury his father, who was murdered by arms dealer Victor Hesse, she requests him to set up a task force with "full immunity and means" to apprehend criminals such as Hesse. McGarrett flatly turns her down as he felt she only asked him to do so for political reasons and boost her ratings. Once he realizes he had no jurisdiction over the investigation, he quickly accepts the job and sets the "Governor's Task Force", which came to be called "Five-0".

Over the course of season 1 it is revealed that Governor Jameson was actually colluding with Wo Fat and other criminals such as Adam's father Hiro. In the season 1 finale it is revealed that she was responsible for the murder of Laura Hills. McGarrett confronts her about it in her office and records her confession on his phone. Wo Fat sneaks in, tasers McGarrett and then shoots and kills the governor after she deletes the recording. Wo Fat attempts to frame McGarrett for the murder by placing the murder weapon in his hand.

Laura Hills

Portrayed by Kelly Hu

Laura Hills, Gov. Jameson's public safety liaison. In the season 1 finale it is revealed that she was sending McGarett evidence from his "Champ" box. She is killed in a car bomb by Wo Fat and Jameson. McGarrett is also framed for her murder after his fingerprints were found in her house.

Michael Noshimuri

Portrayed by Daniel Henney

Michael Noshimuri is Adam's brother who was released from prison during season three, and appears apprehensive about any plans to remake the Yakuza. He attempted to frame Kono for a murder he committed using her gun. In the season three finale, he was killed by his brother, Adam.

Joe White

Portrayed by Terry O'Quinn

Lieutenant Commander Joe White, USN (Ret.) (born July 9, 1954) is Steve McGarrett's former SEAL trainer and a long-time friend of John McGarrett and mentor to Steve. A Wisconsin native, he is a "mustang", having been a master chief petty officer before gaining a commission and retiring as a lieutenant commander. He appears to be well known amongst SEALs from his time as a trainer at the Naval Special Warfare Center, as McGarrett's former SEAL teammate Billy Harrington and SO2 Graham Wilson, who was a person of interest in the episode "Hoʻapono", both knew of him. In the season 2 episode "Kiʻilua / Deceiver", he is forced into retirement after leading an unsanctioned mission into North Korea to rescue McGarrett.

White was one of the few people who knew about Shelburne but he refused to disclose it to McGarrett as he knew it would only hurt him even more emotionally. He would repeatedly give excuses or evade McGarrett's persistent questions about the true identity of Shelburne. As a result, McGarrett, despite seeing him as a father figure, regards him with some distrust.

Mamo Kahike

Portrayed by Al Harrington

Mamo owns a surf rental shop at Waikiki Beach. During the off season he works a bus driver. A long-time friend of McGarrett's father and Chin and Kono's family, he taught Steve, Mary and Kono how to surf as children and is seen as a fatherly figure by them. He is also a history enthusiast and participates in historical reenactments of Ancient Hawaiian society.

Al Harrington is one of several actors who have appeared on the original series. He had a recurring role as Detective Ben Kokua.

Governor Sam Denning

Portrayed by Richard T. Jones

Governor Samuel "Sam" Denning was Lieutenant Governor of Hawaii, replacing Gov. Jameson after her death. He is much more "by the book" and withdraws his predecessor's assurance to the Five-0 Task Force of "full immunity and means". Instead, he brings in former federal agent Lori Weston as a "spy" to keep McGarrett and the rest of Five-0 in line, much to their displeasure. In season 3 he and McGarrett come to a mutual agreement to be open with one another about investigations, with McGarrett pointing out that Governor Jameson's dishonesty was what got her killed. Although not always agreeing with McGarrett's style, Governor Denning does vouch for and backs him when necessary. For example, he dismisses Lou Grover's complaint against McGarrett in season 4 and instead forces the both of them to serve a warrant together and work out their differences themselves.

Nahele Huikala

Portrayed by Kekoa Kekumano

In the episode "Poina ʻOle / Not Forgotten", Nahele was first introduced as a homeless juvenile delinquent who stole McGarrett's prized vintage Marquis and stripped it for scrap metal. McGarrett decides not to file charges after learning that Nahele was living on the streets after running away from his temporary guardian, his negligent uncle, and that his only parent, his father, has been in prison since he was eight. Kamekona agrees to let Nahele work for him as a waiter at the shrimp truck as part of the agreement that McGarrett will not file charges if Nahele keeps his end of the bargain to stay out of trouble. Since then he has looked up to McGarrett as a mentor and an older brother figure. In season 6, his father is released from prison and successfully files for custody of him. Distraught, Nahele confesses a long-buried secret to McGarrett explaining why he still refuses to see his father even though the latter turned his life around.

Dr. Charles "Charlie" Fong

Portrayed by Brian Yang

Charlie Fong is a forensic scientist with the Honolulu Police Department Crime Lab. He provides evidence analysis for the Five-0 Task Force. He attended the prestigious Punahou School and is a childhood friend of Kono.

Ellie Clayton

Portrayed by Mirrah Foulkes

Ellie Clayton is a lawyer and Deputy District Attorney introduced in the season 5 episode "Hoʻoilina / Legacy". She emigrated from Australia with her father Paul as a child. Her father owned a bar called "Aces High" but was shot and killed in a botched robbery nineteen years ago. She was upstairs in their flat and heard the kill shot. A homeless man was prosecuted but the case eventually went cold due to the lack of credible witnesses and evidence. She graduated from law school and returned to Hawaii. In several episodes she aided the Five-0 Task Force by securing arrest warrants or providing advice.

McGarrett meets her by chance when he sees her putting flowers on his father's grave and accosts her. She reveals that John was the uniformed officer who responded to the scene of her father's murder. Every Christmas since then he would visit her and give her a present. According to Chin, John made an effort to keep in contact with her, partly out of guilt and regret for sending his two children away. Ellie reveals that prior to his death, John had called her up to tell her that he had found new evidence. McGarrett recalls finding a "Aces High" matchbook in his father's Champ toolbox and decides to reopen the case in memory of his father. Five-solves the case with the help of a young drug runner whom Paul had tried to help back then (unsuccessfully) and wanted to repay Paul for his kindness. Danny proposed Ellie as a potential love interest, but McGarrett quickly shoots down the idea, saying that due to her connection to his father, they could only be friends. She tries to set a reluctant McGarrett up with various women out of concern that he was too consumed with his work. McGarrett eventually begins a relationship with one of the women, Lynn.

Eric Russo

Portrayed by Andrew Lawrence

Eric Russo (born 1984 or 1985) is the nephew of Detective Danny Williams; his mother Stella is one of Danny's younger sisters. He was first introduced in the episode "Kapu / Forbidden" when Stella sends him to his "Uncle D" in hopes that Danny would be able to set him straight. He dropped out of college and was still undecided about his future. In the episode, he follows McGarrett and the team around as they solve a case involving a college professor and his students. Eric provides some valuable insights which helped solve the case. To Danny's surprise, he decides to pursue forensics and joins the forensics lab as an assistant.

Minor

Commander Wade Gutches

Portrayed by David Keith, commanding officer of SEAL Team 9 and friend of Cmdr. White. He is stationed at Naval Station Pearl Harbor as an instructor.

Kawika

Portrayed by Kala Alexander, leader of the Kapu gang/civic pride group.

Clara Williams

Portrayed by Melanie Griffith, mother of Danny Williams. The character was brought back from the original series and was portrayed by Helen Hayes, the real-life mother of James MacArthur, who portrayed Danny Williams.

Leilani

Portrayed by Lindsay Price, Chin Ho Kelly's ex-girlfriend

Officer Pua Kai

Portrayed by Shawn Anthony Thomsen, an HPD rookie cop. He is often seen teasing Kono and is on friendly terms with the Five-0 team.

Odell Martin

Portrayed by Michael Imperioli, a New York City native and former attorney with a shady past who now owns a barber shop. McGarrett befriended him and is a regular customer.

Criminals and antagonists

Name	Portrayed by	Seasons
		1	2	3	4	5	6	7	8	9
Wo Fat	Mark Dacascos	Recurring	Guest	Recurring	Guest					Guest
Victor Hesse	James Marsters	Recurring	Guest	Archive Footage		Guest
Anton Hesse	Norman Reedus	Guest		Archive Footage		Archive Footage
Gabriel Waincroft	Christopher Sean				Guest	Recurring
Sang Min Soo	Will Yun Lee	Recurring

Main recurring characters

• Wo Fat (Mark Dacascos) was the principal antagonist and nemesis of Steve McGarrett. He is well known in the criminal world for his ruthlessness and ability to wriggle his way around the law. In the 100th episode, he kidnaps McGarrett and tortures him with a heated cattle rod and truth serum. After a bitter fight to the death, McGarrett kills him with a bullet to the head.
• Victor and Anton Hesse (James Marsters and Norman Reedus) are brothers and criminals heavily involved in the illegal arms trafficking trade. During his days as a SEAL, McGarrett was part of a task force which had been investigating and tracking the Hesse brothers for several years. He and his buddy Freddie Hart were sent into North Korea on a classified operation to kidnap Anton Hesse but Hart was killed and Anton was eventually killed when the convoy he and McGarrett were being transported in was attacked. In the pilot, McGarrett personally shoots Victor Hesse but his body was never found. Victor later resurfaces and is eventually caught and sent to prison where he is killed by Wo Fat who was posing as a corrections officer.
• Gabriel Waincroft (Christopher Sean) is the younger brother of Malia Waincroft, the late wife of Chin Ho Kelly. As an adolescent he repeatedly got into trouble with the law and Malia went to Chin, then her boyfriend, for help in setting him straight. Gabriel was initiated into a gang after killing Chin's father and rose through the ranks of the (fictional) Culiacan cartel based in Sinaloa, Mexico. With Wo Fat's death, Waincroft is now the team's primary antagonist. He has been described as daring and ambitious, particularly after he had his men attempt to assassinate the heads of three different criminal syndicates during a high-profile boxing match (the attempt was discreetly foiled by Five-0), in the episode "Ka Makau kaa kaua / The Sweet Science". In "Pa'a Ka 'ipuka I Ka 'Upena Nananana", he was badly wounded and died in surgery from cardiac arrest. His daughter Sarah is currently being cared for by Chin as her legal guardian.
• Michelle Shioma (Michelle Krusiec) is the daughter of the late Goro Shioma and his successor as head of the Hawaiian Yakuza. Introduced in season 6, she is seeking revenge after Gabriel Waincroft has her father assassinated in an attempt to gain control of the criminal underworld in Hawaii. She is married with two daughters. It is mentioned in season 8 that she had been murdered in prison.

Minor characters, ex-cops and informants

• Sang Min Soo (Will Yun Lee) is an informant and former snakehead who was associated with Wo Fat and imprisoned on the mainland for his safety after he testified against his former associates. He chooses to be transferred to Halawa to be nearer to his young son. His appearances are often met with annoyance by the Five-0 team as he would mock McGarrett and Chin, try to rile Danny up or crack inappropriate jokes at Kono (he calls her "Spicy Hot"). The team generally tolerate him as he does provide valuable and much-needed intel for the team on several occasions.
• Adam "Toast" Charles (Martin Starr) is one of Danny Williams' CIs. He is a highly skilled hacker who sometimes helps the Five-0 team with cases related to the cyber-crime underworld that require a more underhanded approach. He was killed in the Season 8 episode "E uhi wale no 'a'ole e nalo, he imu puhi" / "No Matter How Much One Covers a Steaming Imu, The Smoke Will Rise" after his identity as a CI was leaked.
• August March (Ed Asner) is a renowned diamond smuggler who was jailed for over three decades and had been released from prison for six months, according to Captain Fryer in the season 2 episode "Kalele / Faith". He committed a suicide in Season 3. Ed Asner portrayed the character in the original series and was one of several actors who returned to the 2010 reboot.
• Jason "JC" Dekker (Xzibit, credited by his real name Alvin Joiner) is a former gang leader and small-time arms dealer who was re-arrested for violating his parole. The Five-0 Task Force crossed paths with him while investigating the murder of an undercover ATF agent in the episode "Ua Nalohia / In Deep".
• Detective Kaleo (Jason Scott Lee) is a corrupt former Honolulu Police Department cop who was imprisoned for his involvement in the murder of fellow cop Detective Meka Hanamoa, who was the partner of Detective Danny Williams when the latter first joined the HPD. He was initially housed in protective custody due to his former occupation but was sent to "general population" after he aided his brother Daryl in the trafficking of conflict diamonds, indirectly causing McGarrett's sister to be coerced into becoming a mule.. His brother is killed in Season 2 and Kaleo is finally killed in Season 3 by Chin Ho Kelly when he tries to kill him.
• Frank Delano (William Baldwin) is a corrupt former HPD homicide detective who founded his own criminal syndicate composed exclusively of former cops. After Kono was "fired", Delano recruited her into the syndicate. Unbeknownst to him, it was part of Captain Fryer's plot to arrest Delano and his associates. Delano was killed by Chin after Five-0 cornered him and his crew in the season 3 premiere. His brother Paul (portrayed by William Baldwin's real-life brother Daniel) later seeks revenge by drugging and kidnapping Chin.
• Gerard Hirsch (Willie Garson) is a known conman who did time in Halawa after being arrested in the episode "Uaʻaihue" for stealing a Van Gogh painting and for forgery. The team encounter him again in season 6 during an investigation into a case involving a dead counterfeiter and his stash of counterfeit hundred-dollar bills found on several murder victims. Hirsch currently runs his own crime scene clean-up company as part of his plan to "reform" and live an honest life. His expertise as a highly skilled former forger and extensive knowledge of art history have come into handy at times.
• Jason Duclair (Randy Couture) is a serial arsonist and murderer who was notorious for picking married couples and setting their houses on fire, after ensuring that their doors, windows and any exits were locked. He was wanted for a series of deaths by arson throughout California but went into hiding for a period before resurfacing in Hawaii. He is imprisoned in the maximum security section of Halawa. He committed suicide in the Season 8 premiere.