Jill Riley (Shawn Weatherly); (season 1); was the most experienced female lifeguard on the service, she trained Shauni McClain on how to become a better lifeguard and was respected by all of her friends at Baywatch. She died from an blood embolism caused by a shark attack.
Eddie Kramer (Billy Warlock); (seasons 1–3); Eddie began life on Baywatch as a teenager with a complicated background. Being an orphan, he learned from a very early age to defend himself - a theory that got him into trouble quite a few times while in his first year on Baywatch. He likes to keep himself fit and likes to box. This helps him in some situations. Eddie is homeless during this time and is helped out by fellow Lifeguard Craig Pomeroy (Parker Stevenson). Eddie eventually managed to secure a place of his own. He developed a relationship with Shauni McClain. They eventually married and moved to Australia. In Season 2, Billy was moved from a regular cast member to supporting lead, replacing Stevenson. He would remain there until his departure along with Erika in the beginning of Season 3. After his departure in 1992, Warlock explained his departure was voluntary as he had been unhappy with the direction Baywatch had taken. Warlock later reprised his character for one episode in the spin-off series, Baywatch Nights in 1996 and also in the 2003 television movie, Baywatch: Hawaiian Wedding.
Shauni McClain (Erika Eleniak); (seasons 1–3); Shauni was a complete rookie when she started out as a lifeguard with Baywatch, being scared of people drowning and freezing up when people needed CPR, she was put under the wing of experienced lifeguard Jill Riley, where she became confident in her abilities.In her time at Baywatch she fell for and married her long term colleguee Eddie Kramer played by Billy Warlock. Their onscreen Chemistry and romance became real for a time. Erika Eleniak played in 44 episodes of the first and second seasons, and first two episodes of the third season, she was the show's female mainstay from 1989 until 1992. It was reported by both producers and Erika herself that her departure was down to her dislike for the direction the show was taking.
Trevor Cole (Peter Phelps); (season 1); became the first male Baywatch sex-symbol. Phelps was the first main cast member to exit the series. His character's disappearance was never addressed onscreen, but he had previously expressed interest in returning home to Sydney, Australia.
Hobie Buchannon (Brandon Call, season 1; and Jeremy Jackson, seasons 2–9); the son of Mitch Buchannon; he forms a romantic relationship with his long-time crush, Summer Quinn. His parents are divorced and his mom, Gayle appears in several episodes. According to Hasselhoff, the role almost went to Leonardo DiCaprio.
Ben Edwards (Richard Jaeckel); (season 2, recurring seasons 3–4); Edwards was part of the first team of lifeguards at Baywatch (formed in the 1950s), known as 'The Red Knights'. He was the longest serving lifeguard at Baywatch and retired in 1994. Ben had a close relationship with Mitch Buchannon, and served as a mentor to him. Some time before the series started, Ben had crushed his hip when he jumped from a huge height to save a drowning fisherman. He was unable to swim after this injury and required the use of a walking cane. Captain Thorpe promoted Ben to lieutenant instead of firing him. He was eventually promoted to captain, after Thorpe's departure. The day he resigned, he made his final rescue when he jumped off a pier to save a young boy. He was then happy to 'go out on top'.
Kaye Morgan (Pamela Bach); (recurring seasons 2-3, 5–6). Pamela Bach portrayed two other characters in later seasons.
Summer Quinn (Nicole Eggert); (seasons 3–4); Summer and her mother, Jackie, moved to California to escape Jackie's abusive ex-boyfriend. They traveled across the country in their trailer and set up home in a local trailer park. Summer was a star athlete in her hometown winning many awards for swimming. Her mother's ex-boyfriend tracked them down and confronted Summer. When he began to get physical with her, Matt Brody stepped in and stopped him. This was the start of a long friendship between the two. Later, with the help of C.J. Parker, Summer overcame bulimia.
Matt Brody (David Charvet); (seasons 3–5, recurring season 6); Matt had a long-term relationship with Summer Quinn in the fourth season, and pursued a similar relationship with C.J. Parker in the fifth and sixth seasons. He was forced to resign because of a phony sexual harassment lawsuit filed by series 'bad girl,' Neely Capshaw.
Jimmy Slade (Kelly Slater); (season 3, recurring season 4); Jimmy Slade was a main character during the third season and had a gift for surfing. He was constantly trying to become a professional surfer and had a romantic relationship with Summer Quinn. He had a very strict military father, who he did not get along with, and a mother who abandoned him. Due to his family circumstances, he lived alone on the beach in his van. He eventually did break into the professional circuit and left Baywatch to move to Hawaii.
Stephanie Holden (Alexandra Paul); (seasons 3–7); when Stephanie was seven years old her father died in a helicopter crash in Vietnam. This affected her deeply and she developed a huge fear of helicopters. Stephanie was eventually abandoned by her mother and was raised by her grandmother. She developed a romantic relationship with Mitch Buchannon, and the two became very serious. The relationship ended abruptly when Stephanie left Mitch without explanation (she was married). Stephanie and Mitch eventually got over their differences and formed a strong friendship. She dies in season 7 from a lightning strike while at sea. Paul later reprised her role as the late Stephanie in a second season episode of the spin-off series, Baywatch Nights in 1997. In 2003, Paul played a Stephanie doppelganger named Alison Ford in the TV-movie, Baywatch: Hawaiian Wedding.
Logan Fowler (Jaason Simmons); (seasons 5–6, recurring season 7); first appearance was in the season 5 premiere. The character had just recently arrived in California from Tasmania as part of a lifeguard exchange program. He had a reputation as being a top lifeguard in Australia but immediately began to cause problems once he arrived at Baywatch. He did not work well in a team or obey orders from his superiors, this caused him to clash with many of his fellow lifeguards, including Matt Brody and C.J. Parker.
Cody Madison (David Chokachi); (seasons 6–9); an aspiring Olympic swimmer sidelined by an irregular heartbeat. He had relationships with fellow lifeguards, C.J. Parker and Lani McKenzie.
Neely Capshaw (Heather Campbell (season 5); Gena Lee Nolin seasons 6–8; and Jennifer Campbell, recurring season 9); Neely was the show's resident 'bad girl,' being in constant conflict with her fellow employees and her boss, Mitch Buchannon. She was re-made as a 'good girl' in season 7, and got her lifeguard re-certification after Mitch and Donna Marco (Donna D'Errico) learn of her saving an elderly heart attack victim with CPR following a botched drugstore robbery. Neely became romantically involved with Mitch and they eventually got married, after which she returned to her conniving ways. However, during the Baywatch reunion movie, Neely redeemed herself and she and Mitch were re-married.
Mike "Newmie" Newman (Michael Newman); (seasons 7–9, recurring seasons 1–6) played a caricature of himself and continued onto Baywatch Hawaii.
Samantha Thomas (Nancy Valen); (season 7); was a lifeguard captain and had an elevated position at Baywatch headquarters.
Manny Gutierrez (José Solano); (seasons 7–8, recurring season 9); Manny was one of the younger members of Baywatch. He was taken on permanently by Mitch Buchannon following an outstanding physical test. Manny was in a life-threatening accident and was in a wheelchair for a significant amount of time.
Donna Marco (Donna D'Errico); (seasons 7–8); D'Errico originally joined the cast of the spin-off series, Baywatch Nights mid-way through its first season in 1996. Her character became the new owner of the nightclub/bar, Nights, while aspiring to become a lifeguard at Baywatch. During the second season of Baywatch Nights, D'Errico also joined the cast of the parent series, Baywatch, simultaneously appearing on both series during the 1996-1997 season. After the cancellation of Baywatch Nights in 1997, she continued on the original Baywatch series for the 1997-1998 season.
J.D. Darius (Michael Bergin); (seasons 8–9); was one of the few characters to continue into the Baywatch Hawaii era and also appeared in the 2003 reunion movie, Baywatch: Hawaiian Wedding. A failed pier rescue by J.D. resulted in a victim getting crushed and dying in J.D.'s arms. Blaming himself for the death, he suffered PTSD and took time off to deal with it.
Lani McKenzie (Carmen Electra); (season 8); Electra crossed-over her Baywatch character, Lani, to another series, Pacific Blue for one episode during the 1997-1998 season.
April Giminski (Kelly Packard); (seasons 8–9); the only female character to cross over between Season 8 & Season 9 after the rest of the female Baywatch cast were all let go during what was described as the "Baywatch Bloodbath."
Jessie Owens (Brooke Burns); (season 1, recurring season 2)
J.D. Darius (Michael Bergin); (seasons 1–2)
Sean Monroe (Jason Brooks); (seasons 1–2); a dedicated lifeguard, who thinks that he is making a difference in the world as a lifeguard. Mitch chooses him to be in charge of Baywatch Hawaii. Despite Sean's emotional strength, he has his demons. He blames himself for the death of his son, which led to a divorce from his wife. After taking a charge of Baywatch Hawaii, Sean successfully manages a good team of lifeguards.
Michael Newman (Michael Newman); (season 1, recurring season 2)
Jason Ioane (Jason Momoa); (seasons 1–2); originally from Hawaii, Jason moved to Texas with his mother when he was very young after his father disappeared. At nineteen years old, he was the youngest of the lifeguards at Baywatch Hawaii. Jason found it hard to work as part of a team, being very headstrong. He was often cited as the best water person on the team. Jason was introduced to a wise Hawaiian man named Ko Lani, who helped put him in touch with his Hawaiian heritage, something that Jason became very passionate about. Eventually, he was accepted as one of the Hawaiian people and went through a traditional ceremony to mark it.
Kekoa Tanaka (Stacy Kamano), (seasons 1–2); half Japanese, half Hawaiian; her father is a wealthy Japanese businessman with a high standard of living and morals.
Jenna Avid (Krista Allen); (season 2, recurring season 1); Jenna was the series' femme fatale. She is an extremely selfish character and can be particularly vindictive, especially to Sean Monroe, whom she taunts throughout the series. Eventually, however, the two fall in love.
Zach McEwan (Charlie Brumbly); (season 2); a close friend of Jason Ioane, has an inflated opinion of himself. He sports an extreme quiff-style of surfer hair and Elvis-style aviator sunglasses and Hawaiian clothing.