List of SpongeBob SquarePants characters
The characters in SpongeBob SquarePants were created by artist, animator and former marine biologist Stephen Hillenburg. In addition to the series' main cast, various celebrities have voiced roles in SpongeBob SquarePants. Notably, Ernest Borgnine and Tim Conway voice the roles of recurring characters Mermaid Man and Barnacle Boy respectively (Joe Whyte assumed the role of Mermaid Man shortly after Ernest Borgnine's death in 2012), while others have taken a cameo part.
Creation and conception
Stephen Hillenburg conceived the characters for SpongeBob SquarePants in 1984, while he was teaching and studying marine biology at what is now the Orange County Ocean Institute. During this period, Hillenburg became fascinated with animation, and wrote a comic book titled The Intertidal Zone starring various anthropomorphic forms of sea lives, many of which would evolve into SpongeBob SquarePants characters, including "Bob the Sponge", who was the co-host of the comic and resembled an actual sea sponge as opposed to SpongeBob. In 1987, Hillenburg left the institute to pursue his dream of becoming an animator.
- SpongeBob SquarePants (voiced by Tom Kenny) is the series' title character and protagonist. He is a yellow anthropomorphic sea sponge who physically resembles an artificial, rectangular, kitchen-type cleaning sponge clad in brown short pants, a white shirt, and a red tie. He lives in a pineapple house and is employed as a fry cook at a fast food restaurant called the Krusty Krab. SpongeBob's hobbies include practicing karate with Sandy, as well as jellyfishing, blowing bubbles, playing games with his best friend, a starfish named Patrick Star, and unintentionally irritating his other neighbor, Squidward Tentacles. He attends Mrs. Puff's Boating School but has never passed; his lack of a driver's license is a running gag throughout the series. Green and purple were early color choices for the character before yellow was chosen. He is usually seen as weak and fragile, and he first appears in "Help Wanted".
- Patrick Star (voiced by Bill Fagerbakke) is a starfish who lives under a rock, and whose most prominent character trait is his extremely low intelligence. He is best friends with SpongeBob and often encourages activities that get the two into trouble, especially when Squidward Tentacles is involved. While typically unemployed throughout the course of the series, Patrick holds various short-term jobs as the storyline of each episode requires. He is generally good-natured and is "the tough one" of the two who is often called to fight SpongeBob's battles for him (although he usually gets distracted). Patrick is shown to have a mean temper in certain episodes. He first appears in "Help Wanted".
- Squidward Tentacles (voiced by Rodger Bumpass) is a octopus with a large nose. He is SpongeBob and Patrick's ill-tempered neighbor with a dry, sarcastic sense of humor. He has no artistic or musical ability but believes himself to be extremely talented. He plays the clarinet and loves to paint self-portraits in different artistic styles, which he hangs up around the walls of his moai-shaped house. He loathes SpongeBob and Patrick and Squilliam (although they are oblivious to his animosity, and consider him a close friend) as well as his current occupation at the Krusty Krab. He regularly acts condescendingly toward customers and is often seen sleeping on the job. This character may be slightly based off of Stephen Riendeau
- Sandy Cheeks (voiced by Carolyn Lawrence) is a squirrel from Texas. She has a number of athletic interests, such as "sand-boarding" and karate, and is a rodeo champion. She also works as a scientist (Mainly after the movie), explorer, and inventor. Being from the surface, she lives in a tree inside a glass dome so she can breathe. To survive underwater, she wears a diving suit and helmet to travel outside of her treedome. Whenever any aquatic creatures enter her air-filled dome, they must wear helmets filled with water to breathe.
- Mr. Krabs (voiced by Clancy Brown) is a red crab scammer who owns and operates the Krusty Krab restaurant where SpongeBob works. He is self-content, intelligent, and obsessed with the value and essence of money. He lives in an anchor with his daughter Pearl, who is a whale. The Krusty Krab was originally a retirement home called "The Rusty Krab", which he bought after returning from fighting in a nondescript war; when it went bankrupt, he turned it into a restaurant and renamed it "The Krusty Krab". He takes pride in making money, his invention of the Krabby Patty, and his superiority over his rival Plankton's restaurant, The Chum Bucket.
- Gary (voiced by Tom Kenny) is SpongeBob's pet sea snail. Within the series, snails are analogous to kitty cats and are usually kept as pets throughout the cartoon series. Gary almost always vocalizes like a kitty cat. Despite this, other characters can understand and communicate with him. Depicted as a level-headed character, Gary sometimes serves as a voice of reason for SpongeBob, and solves problems that his owner cannot.
- Sheldon Plankton (voiced by Mr. Lawrence) is a plankton who owns the Chum Bucket, the rival restaurant to the Krusty Krab. As the self-proclaimed archenemy to Mr. Krabs, he constantly tries to steal Krabs' secret recipe for Krabby Patties, but is always unsuccessful (except, temporarily, in The SpongeBob SquarePants Movie). Sometimes, not only does he wish to run Mr. Krabs out of business, but he also wishes to rule the world. His wife is Karen, a computer of his creation. Though he is considered the main antagonist of the series, he has been portrayed as a protagonist or anti-hero on several occasions.
- Karen (voiced by Jill Talley) is Plankton's nagging computer W.I.F.E. (as in an acronym for "Wired Integrated Female Electroencephalograph") and voice of reason. She apparently has a mind of her own to the point of making fun of Plankton. Karen usually helps Plankton in his schemes to steal the Krabby Patty secret formula, although on occasions Plankton rejects her ideas and then takes them as if they were his own. She has a sarcastic attitude towards Plankton, and it is revealed in The SpongeBob SquarePants Movie that she never agreed to marry Plankton.
- Mrs. Puff (voiced by Mary Jo Catlett) is a pufferfish with blonde hair, who is the owner and teacher of a boating school (analogous to driving school, as the "boats" are underwater equivalents to cars). Her first appearance within the episode "Boating School", which first aired on August 7, 1999. She dreads instructing SpongeBob due to his inability to drive without crashing. As a running gag, she frequently gets in trouble with the police due to SpongeBob's inability to drive without causing public damage. She can also change her voice to need.
- Pearl Krabs (voiced by Lori Alan) is Mr. Krabs' teenage sperm whale daughter. The series has yet to explain their disparity in species, although in the book SpongeBob's Trivia Book, Mr. Krabs explains that Pearl takes after her mother, suggesting that her mother is a whale. Her mother is never seen or mentioned in the series. Pearl is frequently embarrassed by her father's cheap attitude and often forces him to try and change his habits.
- Mermaid Man (voiced by Ernest Borgnine (1999–2012)/Tom Kenny (young)/Adam West)Joe Alaskey (young) and his sidekick Barnacle Boy (voiced by Tim Conway/Burt Ward (young)) are two elderly and partially senile superheroes who live in a retirement home and are stars of SpongeBob and Patrick's favorite television show. Mermaid Man is known for completely forgetting things, yelling a prolonged "EVIL!" whenever he hears the word, while Barnacle Boy seems to be the smarter, more sensible (but also much more irritable) of the two. The 3rd season episode "Mermaid Man and Barnacle Boy V" reveals that Barnacle Boy's given name is Kyle, but it is changed to Tim in the 8th season episode "Mermaid Man Begins", where it is also revealed that Mermaid Man's given name is Ernie. Since Borgnine's death (besides their appearance in "Patrick-Man!"), neither Mermaid Man nor Barnacle Boy has appeared, and are rumored to have been discontinued from the show. Aquaman artist Ramona Fradon drew the Mermaid Man and Barnacle Boy comic book adventures.
- Larry the Lobster (voiced by Mr. Lawrence) is a lobster lifeguard of the Goo Lagoon. Larry is a bodybuilder and workout fanatic, and has occasionally been seen hanging out with SpongeBob and Patrick
- The Flying Dutchman (voiced by Brian Doyle-Murray) is an irascible pirate ghost named after a ghost ship, The Flying Dutchman. His first appearance is in the Halloween-themed "Scaredy Pants", though he is first mentioned in "Squidward the Unfriendly Ghost", in which SpongeBob and Patrick discover that he haunts the seven seas because his unburied corpse was used as a window display. Included in his arsenal of supernatural powers are intangibility, levitation, teleportation, energy projection, shapeshifting, interdimensional travel, matter transmutation, and wish-granting. He lives underwater in a giant ship and collects souls, though he also resides in a cavern containing the Davy Jones' Locker, a literal locker stuffed with countless smelly socks, which within the series seems to be analogous to Hell; it is the place where one who trades their souls for wishes go, while "Who the Davy" (analogous to "Who the hell") is once used as a curse word. He is a Satanlike or Satanist character.
- Patchy (portrayed by Tom Kenny) is a live-action character who is a pirate and the president of the SpongeBob Fan Club. He lives in an unnamed suburb of Encino, California, and is normally present in specials, often in a dual narrative with the animated SpongeBob, although sometimes he merely introduces the episode. He made a special guest star appearance on Big Time Rush in the episode "Big Time Beach Party" with Carlos Pena Jr. and Logan Henderson. Many People believe that he may be similar to Captain Feathersword from "the Wiggles" franchise (due to the fact they're both Live-action pirates).
- Potty (voiced by Stephen Hillenburg/portrayed by Paul Tibbitt) is Patchy the Pirate's "annoying" pet green parrot. Potty is a crudely made puppet controlled by very obvious strings. He is obnoxious and often annoys or talks back to Patchy.
- Officer Nancy (Sirena Irwin) and Officer John (Dee Bradley Baker/Thomas F. Wilson/Mr. Lawrence) are partners and the two most commonly seen police in Bikini Bottom, appearing most prominently in Season 3. Nancy is a purple female police fish with blonde hair and John is a male police fish, whose colour varies. Although John still regularly appears on the show, Nancy has been mostly retired from the series.
- Dr. Gilligan Scales (voiced by Rodger Bumpass) is a purple Doctor fish Bikini Bottom doctor.
- Elaine (voiced by Mr. Lawrence/Tom Kenny) is a live-action announcer and news anchor fish, resembling a cut-out of a bass fish. Elaine appears in numerous episodes, including the intro to the show. His name is revealed to be Elaine in "The Great Patty Caper", though he has been called Johnny in Battle for Bikini Bottom, although this is only in the video game series, making his canonical name Elaine.
- Perch Perkins is a Yellow perch and field news reporter. His name was first revealed in "The SpongeBob SquarePants Movie" as he announced the arrival of the Krusty Krab 2.
- Harold SquarePants (Tom Kenny) and Margaret SquarePants (née BubbleBottom) (Sirena Irwin) are SpongeBob's parents, who more resemble sea sponges rather than SpongeBob's shape as a kitchen sponge. Harold is brown with glasses and a moustache, while Margaret is dark orange. They seem to live outside of Bikini Bottom, since SpongeBob says "Goodbye Bikini Bottom!" when he almost moves back to his parents' home in "Home Sweet Pineapple".
- Squilliam Fancyson (Dee Bradley Baker) is Squidward Tentacles's arrogant and wealthy arch-rival who has been able to succeed in everything Squidward has only dreamed of doing. He and Squidward quarrel in the series on many occasions and Squidward normally does not win over his rival. Though sometimes mistaken as a relative of Squidward due to their similarities, they were band classmates in high school and are not related. Squilliam owns a ridiculously large, almost castle-like four-stories mansion including an elevator with a built-in bathtub, toilets with gold toilet paper, and an expansive garden on the rooftop.
- Mrs. Betsy Krabs (Paul Tibbitt first two appearances/Sirena Irwin subsequent appearances) is Mr. Krabs' overbearing mother who still treats him slightly like a kid and first appeared in "Sailor Mouth". Plankton has a small crush on her in "Enemy in Law".
- Man Ray (John Rhys-Davies/Bob Joles) and the Dirty Bubble (Charles Nelson Reilly/Tom Kenny) are villains against Mermaid Man and Barnacle Boy. Man Ray has a man's body with a helmet shaped to look like a stingray's head, which hides the fact that he does not have a head, while the Dirty Bubble is a giant dirty bubble with a villainous face. Man Ray retires as supervillain in the episode he is introduced in, "Mermaid Man and Barnacle Boy III", and seems to have taken a benevolent path as seen in "Shuffleboarding", though he sometimes takes the job again, such as in "Mermaid Man and Barnacle Boy V". Charles Nelson Reilly originally voiced the Dirty Bubble, but Tom Kenny has portrayed the character since Reilly's death in 2007.
- Grandma SquarePants (Marion Ross) is SpongeBob's paternal grandmother. She has six children with her late husband, whose wisdom SpongeBob sometimes cites when he plans something. She is a stereotypical grand mom, always spoiling SpongeBob whenever he visits her house with cookies, milk, sweater, and bedtime stories, even though SpongeBob, as he puts it, is already an adult.
- Old Man Jenkins (Tom Kenny/Doug Lawrence/Dee Bradley Baker) is an elderly fish who used to live in the Rusty Krab rest home before it became the Krusty Krab restaurant. He currently resides at Shady Shoals Retirement Home along with Mermaid Man and Barnacle Boy. His appearance changes in almost every episode he appears. One of his critical appearances is in "The Sponge Who Could Fly" wherein he plays a farmer, a sailor, and finally, a human cannonball. He is friends with Mama Krabs, as revealed in "Sailor Mouth" and "Friend or Foe?" He believe SpongeBob is a Bran Flakes box
- King Neptune (John O'Hurley/Kevin Michael Richardson/Jeffrey Tambor/Billy West) is a nigh-omnipotent, trident-wielding merman god who rules the sea, based on the mythological deity of the same name. In the series, Neptune lives in a palace in Atlantis with his wife, Amphitrite, and son, Triton. He is usually portrayed as arrogant and selfish, showing little sympathy for the sea's fish populace. For example, he challenges SpongeBob to a cooking duel designed to be impossible for SpongeBob to win in "Neptune's Spatula", and he corrupts his son Triton, who does care about the fish populace at first, to become like him in "Clash of Triton". Neptune has a mostly blue-green color scheme with a long brown beard and hair. A different King Neptune is featured in The SpongeBob SquarePants Movie. In the film, he resides near Bikini Bottom with his daughter, Mindy, and he resembles a green-skinned, Western European king with stereotypical king's robes, neatly-trimmed hair, a domed crown to cover his bald spot, and powers limited to what can be exercised through his trident.
- The French Narrator (Tom Kenny) is the one who narrates in certain episodes, usually at the beginning and the end, and also the time cards. He has a thick French accent, a reference to French ocean explorer Jacques Cousteau. So far, he has only been seen on screen once in the episode "No Free Rides", in which SpongeBob hits a scuba diver with a camera, who is heavily implied to be the narrator. In "Can You Spare a Dime?", the narrator is briefly replaced by an English-accented narrator who reads a transition card with this caption: "So much later that the old narrator got tired of waiting and they had to hire a new one".
- The Alaskan Bull Worm (voiced by Dee Bradley Baker) is a giant worm that terrorizes Bikini Bottom in "Sandy, SpongeBob, and the Worm".
- Angry Jack (voiced by Dee Snider) is the owner of a pet emporium in "Shell Shocked". He initially puts up his angry demeanor as a marketing stint, but when SpongeBob accidentally destroys his emporium, he becomes very angry.
- The Atomic Flounder is a villain, known for blasting radioactive beams from his mouth.
- Blackjack SquarePants (voiced by John DiMaggio) is SpongeBob's cousin who has bullied him since childhood. In his lone appearance, Blackjack was imprisoned for littering but has since been released.
- Bubble Bass (voiced by Dee Bradley Baker) is an obese green bass who appears in the episode "Pickles". He challenges SpongeBob's ability to cook when the latter apparently forgets to place pickles on his Krabby Patty (he actually hides them under his tongue), making SpongeBob briefly doubt himself.
- Bubble Buddy (Mr. Lawrence) is a humanoid bubble created by SpongeBob in "Bubble Buddy". His apparent inanimateness annoys other people of Bikini Bottom, but he is later revealed to be a sentient being before moving out of the town by a taxi-shaped bubble.
- Bubbles (voiced by Matt Berry, Jeff Bennett in the video game SpongeBob HeroPants) is a god-like dolphin who is the overseer of the universe, watching them from a triangular building in the space. SpongeBob and Plankton accidentally end up in his audience while using the time machine in The SpongeBob Movie: Sponge Out of Water.
- Burger-Beard the Pirate (portrayed by Antonio Banderas) is a pirate who, upon discovering a book capable of rewriting reality, steals the Krabby Patty formula to open up a fast food drive-in while also changing Bikini Bottom into a wasteland. He appeared as the main antagonist of The SpongeBob Movie: Sponge Out of Water.
- Charlie is a fish often as a background character in the show. His name was revealed in while he was in a TV commercial with Mr. Magic endorsing a product called "Mr. Magic's Magical Magic Kit".
- Clamu (voiced by Frank Welker) is a giant clam who only appeared in "The Smoking Peanut".
- Craig Mammalton (voiced by Dee Bradley Baker) is a seal who is popular among the Goo Lagoon-goers for his tanned skin and golden caramel brown bones. In "Sun Bleached", he holds parties during the night that only permits those with tanned skin to enter, the highest level of which is bleached skin. He is a parody of George Hamilton.
- The Cyclops (voiced by Neil Ross and portrayed by Aaron Hendry) is a marine diver who is always seen wearing a diving suit and helmet, appearing only in The SpongeBob SquarePants Movie. He is actually a normal adult man; however, because humans tower virtually all sea life, Mindy describes him as "the worst of all hazards". He is the owner of "Shell City", which is really the name of a seaside gift and souvenir shop.
- Dennis (voiced by Alec Baldwin) is a hitman hired by Plankton to assassinate SpongeBob and Patrick before they are able to retrieve King Neptune's Crown from Shell City. Before he manages to do that, however, he is first stomped by the Cyclops, then hit by a pier. He only appeared in The SpongeBob SquarePants Movie.
- Deauuugggh a blue fish known for his line that appears in "Something Smells".
- DoodleBob (voiced by Paul Tibbitt) is a hand-drawing created by SpongeBob in his image using a human pencil, which is seemingly able to animate anything it draws. He is known to act and speak like a stoner often known to say "Me Hoy Minoy" and other words like "Noy". He appears in "Frankendoodle", serving as the antagonist until SpongeBob manages to trap him inside a book. He also featured as the main villain to defeat in the Drawn to Life: SpongeBob SquarePants Edition video game.
- Flatts the Flounder (voiced by Thomas F. Wilson) is a green flounder who is a classmate of SpongeBob in the Boating School as revealed in "The Bully". He wants to kick SpongeBob's "butt" for no apparent reason, though SpongeBob takes it as if he wants to murder him.
- Frankie Billy is an olive green fish and another character model for the series. His first name was revealed in "Sun Bleached" and his last name was revealed in "Professor Squidward" when Squidward asks how he likes putting his name on the board. He first appears in the Season 2 episode, "Life of Crime", and eventually a couple Season 3 episodes and appears more and more in Season 4-present episodes.
- Fred Rechid (voiced by Mr. Lawrence/Dee Bradley Baker/Jim Cummings), better known as the character who shouts "MY LEG!" when injured (alone or in a group), is a brown fish who was one of the first of the generic character models to appear in the series. He first appears in "Reef Blower", but his famous line, a running gag in the series, is not heard until "Boating School".
- Friend (voiced by Dee Bradley Baker) is a blue jellyfish and the only one among the jellyfishes who is not captured by SpongeBob in "Jellyfish Hunter" due to his intelligence. SpongeBob initially calls him "No Name", but later changes it to "Friend" after helping him free the captured jellyfishes from Mr. Krabs.
- Gene Scallop (voiced by Gene Shalit) is a food critic who critiques Krusty Krab in "The Krusty Sponge". He gives a bad review on everything save SpongeBob, whose popularity is exploited by Mr. Krabs by remaking Krusty Krab to have a SpongeBob theme. He is modeled after his voice actor, a real-life book and film critic.
- Gordon (voiced by Ian McShane) is the leader of a band of Vikings who kidnaps SpongeBob and Squidward in "Dear Vikings". Apparently, except for himself, all of his crewmen are named "Olaf".
- Grandpa Redbeard (voiced by Dennis Quaid) is Mr. Krabs' pirate paternal grandfather. In "Grandpappy the Pirate", he visits his grandson, thinking that the latter is also a pirate instead of the owner of a restaurant, and Mr. Krabs as such tries hard to disguise the Krusty Krab as a pirate ship during his visit.
- Granny (voiced by Amy Poehler) is an elderly fish who appeared in "Have You Seen This Snail?" She lives in Bass Vegas and has taken in many snails so she could eat them and take their shells, first by force-feeding them (similar to the witch in Hansel and Gretel). She "adopts" Gary as her new victim, but the latter manages to escape.
- Grubby Grouper (voiced by Corky Carroll) is a green fish wearing a white tank top and a red hat who appeared in Bubble Buddy. He is a stereotypical beach bum-esque character who is Pearl's crush.
- Harold (Mr. Lawrence/Dee Bradley Baker/Clancy Brown) is a blue fish with a shark-like fin, spiky teeth, a white T-shirt and a red speedo. His name was revealed in both Have You Seen This Snail? and in "Roller Cowards" when Tina Fran says his name. His first appearance was in Ripped Pants.
- The Hash Slinging Slasher is a fictional fry cook created by Squidward to scare SpongeBob in "Graveyard Shift". According to him, the Slasher was SpongeBob's predecessor in Krusty Krab who replaced his hand with a spatula after it burned, was hit by a bus, and was fired on his funeral. Three signs are said to herald his coming: lights flickering on and off; unanswered phone ringing; and the bus that hit him arriving to deliver him.
- Herb and Margie Star are Patrick's parents. Their identities are temporarily taken by another starfish couple, Marty and Janet (voiced by Susan Boyajian) in "I'm With Stupid". In "Rule of Dumb", it is revealed that Herb is a brother of Gary's father, Sluggo, making Patrick and Gary first cousins.
- The Invicibubble, Mr. Superawesomes, Sour Note, Sir Pinch-A-Lot, The Rodent and Plank-Ton (voiced by Tom Kenny, Bill Fagerbakke, Rodger Bumpass, Clancy Brown, Carolyn Lawrence, and Mr. Lawrence) are SpongeBob, Patrick, Squidward, Mr. Krabs, Sandy and Plankton's superheroes who appeared only in "The Spongebob Movie: Sponge Out of Water".
- Jack Kahuna Laguna (voiced by Johnny Depp) is a legendary human-like surfer who appeared in "SpongeBob SquarePants vs. The Big One". He teaches SpongeBob and his friends how to surf so they can go back home and fend off from "The Big One" tidal wave.
- Jim (voiced by Patton Oswalt) is Krusty Krab's original fry cook, as revealed in "The Original Fry Cook", whose cooking is legendary throughout Bikini Bottom. Though he cooks better than SpongeBob, Mr. Krabs decided to hire the latter since SpongeBob is willing to accept anything, in contrast to Jim's demand for a high salary.
- Junior (voiced by Dee Bradley Baker) is a baby scallop whom SpongeBob and Patrick adopt in "Rock-a-Bye Bivalve". He matures at the end of the episode and leaves the two, having gained the ability to fly.
- King Jellyfish (voiced by Tom Kenny) is a giant purple jellyfish and the king of all jellyfishes in Jellyfish Fields and Kevin's enemy who appeared in "I'm Your Biggest Fanatic".
- Lord Royal Highness (voiced by David Bowie) is the king of Atlantis in "Atlantis Squarepantis". He invites SpongeBob and his friends for a visit to Atlantis after they find the lost piece of the coin, but eventually regrets it since they (especially Patrick) end up wrecking his treasury.
- Mama Tentacles (voiced by Rodger Bumpass) is Squidward's elderly mother. In earlier episodes, she only appeared as hallucinations tormenting Squidward in "Fools in April" and "Ghost Host", though she later appeared in person in "Krusty Towers", where she is shown to live in a moai-shaped house like Squidward, but with a womanish curly hair-like structure and on its head and earring-like balls hanging from its ears.
- Mary - An elderly fish who lives in Bikini Bottom with her even more elderly, grumpy mother, about whom she is annoyed. Her premiere appearance was in "Chocolate with Nuts", wherein SpongeBob and Patrick trick Mary's mother into buying some chocolate to apply to her skin and achieve immortality.
- Master Udon (voiced by Pat Morita) is an old karate master who appeared in "Karate Island". He is actually a scammer who wants people to invest in his condominium project, disguising it as the "King of Karate" crowning that he presents to SpongeBob.
- Monroe Timmy (Dee Bradley Baker/Sara Paxton) is one of the few children on the show. He is a small, orange fish who wears a pair of green shorts. His name was revealed in "Krabby Land". He has also been seen in "Mid-Life Crustacean", "Born Again Krabs", and "Giant Squidward".
- The Moth (voiced by Mark Hamill) is a supervillain moth and an enemy of Mermaid Man and Barnacle Boy who appeared in "Night Light". Even though he is minuscule, he has the strength to carry both SpongeBob's house and a lighthouse.
- Mystery (voiced by Frank Welker) is a stray green neighing seahorse whom SpongeBob adopted in "My Pretty Seahorse". SpongeBob is forced to abandon her as she causes too much trouble for the Krusty Krab.
- Nancy Suzy Fish (Sirena Irwin/Grey DeLisle/Carolyn Lawrence) - an often seen, but infrequently heard, yellow dress-wearing, white-haired fish with gray skin. Her name was originally revealed as Nancy in "MermaidMan and BarnacleBoy V", but in "Good Ol' Whatshisname" her name is Suzy Fish.
- Nat Peterson (voiced by Dee Bradley Baker/Tom Kenny/Rodger Bumpass/Daran Norris) - A male yellow fish that is a common background character on the show. His last name is revealed in "Missing Identity", and his first name was revealed in "Plankton's Regular" and "House Fancy", his biggest role to date.
- Nicholas Withers (voiced by Alton Brown) is the presenter of the popular lifestyle TV show, "House Fancy". He is pending on an award for Best Architecture during the episode that features Squilliam's house; he eventually gives it to Squidward due to the "creative" design of his ruined house.
- Painty The Pirate (voiced by Patrick Pinney and Peter Shukoff) is the painting of a pirate at the beginning of every SpongeBob episode to date. Peter Shukoff voiced Painty once, in The Spongebob Movie: Sponge Out of Water in the rap battle.
- PanSponge and SimiPatrick (voiced by Tom Kenny and Bill Fagerbakke) are SpongeBob and Patrick's prehistoric ancestors. They learn jellyfishing from Squidward, which ends up passing over to their current descendants.
- Princess Mindy (Scarlett Johansson) is King Neptune's daughter. She is Patrick's love interest and the future queen of Bikini Bottom. She is a motherly and friendly person and a very good friend of SpongeBob and Patrick. Her look and behavior are very similar to The Little Mermaid. Her only appearance was in The SpongeBob SquarePants Movie
- Prince Triton (voiced by Sebastian Bach) is the teenage son of King Neptune who appeared in "The Clash of Triton". He initially wants to be a normal fish like everyone else, but his father convinces him otherwise.
- Queen Amphitrite (voiced by Victoria Beckham) is King Neptune's wife and Triton's mother who is worried by her son's attitude of not wanting to inherit the throne.
- Queen Jellyfish (voiced by Tom Kenny) is a large pink jellyfish and is presumably the spouse of King Jellyfish. She appeared in "Jellyfishing", where she electrocutes Squidward twice.
- Sadie Rechid (Carolyn Lawrence) An orange fish who is another common background character on the show.
- Sally (Sirena Irwin/Carolyn Lawrence/Doug Lawrence) is a light yellow butterfly tang fish.
- Sandals Fishbowl (Doug Erholtz/Dee Bradley Baker) is a light olive green colored fish.
- Scooter (Carlos Alazraqui/Clancy Brown) - A parrotfish who enjoys surfing. He allegedly died and became an angel in the second-season episode "Bubble Buddy", though he returned for future episodes. Scooter spoke like a stereotypical Southern Californian but soon he started speaking normal, and he is most often seen at Goo Lagoon.
- The Sea Bear (Dee Bradley Baker) is a creature that appears in the episode "The Camping Episode". During that episode, SpongeBob and Patrick say that the sea bear exists while Squidward does not believe that sea bears exist. There is also a sea rhino
- Sea Monster (voiced by Gene Simmons) is a lizard-like sea monster who appeared in "20,000 Patties Under the Sea", having slept for 79 years and demands SpongeBob and Patrick to sell him food in exchange for giant dollar bucks.
- The Sea Rhinoceros (Dee Bradley Baker) is a creature that appears in the episode "The Camping Episode".
- Sergeant Roderick (voiced by Robin Sachs) is a strict drill sergeant who temporarily replaces Mrs. Puff as driving instructor for her boating school in "Mrs. Puff, You're Fired".
- Uncle Sherm SquarePants is SpongeBob's uncle and Stanley's father.
- Snellie the Snail (voiced by Dee Bradley Baker) is a female purebred snail with a purple shell, blue eyes, and a large pink bow who appeared in "The Great Snail Race". She is bought by Squidward for $1,700 to compete in the Great Snail Race, but ends up losing the competition to save the injured Gary, whom she fell in love with.
- SpongeBuck SquarePants, Patrick Revere, Pecos Patrick, Rosie Cheeks, Dead Eye Plankton, William Krabs, Hopalong Tentacles, and Polene Puff (voiced by Tom Kenny, Bill Fagerbakke (both Patrick and Pecos), Carolyn Lawrence, Mr. Lawrence, Clancy Brown, Rodger Bumpass, and Mary Jo Catlett) are SpongeBob, Patrick (both Patrick and Pecos), Sandy, Plankton, Mr. Krabs, Squidward, and Mrs. Puff's wild west ancestors who appeared in "Pest of the West".
- SpongeGar, Patar, and Squog (voiced by Tom Kenny, Bill Fagerbakke, and Rodger Bumpass, respectively) are SpongeBob, Patrick, and Squidward's neolithic ancestors, respectively, who appeared in "Ugh". While still not be able to speak intelligibly, they are more advanced than the primitive ancestors in "SB-129", as they are shown to use stone tools and later, fire. Also appearing in the episode are Primitive Gary (voiced by Tom Kenny), Gary's gigantic ancestor and SpongeGar's pet, and Primitive Krabs (voiced by Clancy Brown), Mr. Krabs' tiny ancestor who repeatedly chants "money".
- SpongeTron and Patron (voiced by Tom Kenny and Bill Fagerbakke, respectively) are SpongeBob and Patrick's robotic descendants who appear in "SB-129". SpongeTron has 486 clones, each one named after a letter of the English alphabet from 2,000 years in the future, while Patron has two heads.
- The Squidasaurus Rex (Rodger Bumpass) is a dinosaur form of Squidward. He appeared only in "The Spongebob Movie: Sponge Out of Water"
- Squidly Tentacles, King Krabs, Princess Pearl, Dark Knight, Planktonamor, and Karen the Crystal Ball (voiced by Rodger Bumpass, Clancy Brown, Lori Alan, Carolyn Lawrence, Mr. Lawrence, and Jill Talley, respectively) are the medieval counterparts of Squidward, Mr. Krabs, Pearl, Sandy, Plankton, and Karen, respectively, in "Dunces and Dragons". Planktonamor additionally keeps a pet, the Dragon Jellyfish, who is a giant jellyfish with a mane and a tail.
- Stanley SquarePants (voiced by Christopher Guest) is SpongeBob's cousin. He has so far only made one appearance in the series. SpongeBob receives Stanley in a package sent by one of his uncles, who is relieved to have sent Stanley, since he would destroy anything he touches. True to this, despite SpongeBob trying to teach him, Stanley constantly destroys everything and almost makes SpongeBob lose his job. To counteract this, Mr. Krabs sends Stanley to work with Plankton, destroying Chum Bucket in the process.
- Tattletale Strangler (voiced by Thomas F. Wilson) is a criminal fish who is detained for repeatedly strangling someone and promises to strangle SpongeBob when the latter has him arrested in "SpongeBob Meets the Strangler".
- Tina Fran is a pretty light red fish who wears a blue dress and skirt. She is one of Pearl Krabs' friends seen in "Squeaky Boots". Her name is revealed in "Hall Monitor", where she attended Mrs. Puff's Boating School.
- Tom (Mr. Lawrence/Dee Bradley Baker/Mark Camacho) is a green fish who wears a purple shirt and who serves as another generic character model for the show. He plays a heightened role, however, in the episode "Chocolate with Nuts".
- Warden (voiced by R. Lee Ermey) is the head prison warden of the Inferno Island prison, appearing in "The Inmates of Summer". His demeanor is a stereotype of a drill sergeant: strict, demanding, and always speaking in a loud tone.
- What Zit Tooya (voiced by Dee Bradley Baker) is a middle-aged fish who appeared in "Good Ol' Whatshisname". He is the last customer whose name SpongeBob and Squidward need so they could receive Mr. Krabs' promised tour guide. His name rhymes with "What's it to ya?", which causes confusion on Squidward's part.
- The Yeti Crab Is a crab in one of Mr. Krab's stories, but turns out to be real.
The characters of SpongeBob SquarePants have been well-received overall. The titular character SpongeBob has become very popular with children and adults. The character's popularity has spread from Nickelodeon's original demographic of two- to eleven-year-olds, to teenagers and adults, including college campuses and celebrities such as Sigourney Weaver and Bruce Willis. The popularity of SpongeBob translated well into sales figures. In 2002, SpongeBob SquarePants dolls sold at a rate of 75,000 per week, which was faster than Tickle Me Elmo dolls were selling at the time. SpongeBob has gained popularity in Japan, specifically with Japanese women. Nickelodeon's parent company Viacom purposefully targeted marketing at women in the country as a method of building the SpongeBob SquarePants brand. Skeptics initially doubted that SpongeBob could be popular in Japan as the character's design is very different from already popular designs for Hello Kitty and Pikachu. However, the characters have also attracted negative reception, including SpongeBob himself, who was listed as number four on AskMen's Top 10: Irritating '90s Cartoon Characters. Nevertheless, SpongeBob SquarePants was ranked ninth on TV Guide's top 50 cartoon characters.
Appearances in other media
The characters of SpongeBob SquarePants have been parodied various times in popular culture. In 2007, the Amsterdam-based company Boom Chicago created a SpongeBob parody called "SpongeBob SquarePants in China", in which a stereotypically Chinese Patrick refuses to go to work and advocates freedom of speech, rights of leisure, and income. During the same year, production company Camp Chaos created a SpongeBob parody titled SpongeBong HempPants, which features five of the series' characters parodied in the form of various drugs. The show was seen on VH1 and Comedy Central. The series has received mixed reviews from television critics; Adam Finley of TV Squad believed the series sounded "hilarious on paper", but ultimately did not demonstrate its full potential. SpongeBob and Patrick were also referenced in Phineas and Ferb, when the characters of the Disney show dug a hole and found a sponge and a seastar. SpongeBob and Patrick also have an appearance in the Disney show Good Luck Charlie when Charlie's parents have a pink square and a yellow star puppet and are performing a potty training show on a fake television set. SpongeBob has made some appearances in TV shows such as The Simpsons, Family Guy, Robot Chicken, Mad, South Park, Futurama, and The Cleveland Show. Wooldoor Sockbat from Comedy Central's Drawn Together is a parody of SpongeBob, and he even has theme music similar to the background music from SpongeBob.
- Banks, Steven (September 24, 2004). SpongeBob Exposed! The Insider's Guide to SpongeBob SquarePants. Schigiel, Gregg (Illustrator). Simon Spotlight/Nickelodeon. ISBN 978-0-689-86870-2.
- Banks, pp. 8–9
- Banks, p. 9
- Hillenburg, Stephen (2003). The Origin of SpongeBob SquarePants. SpongeBob SquarePants: The Complete First Season (DVD). Paramount Home Entertainment.
- Neuwirth, Allan. Makin' Toons: Inside the Most Popular Animated TV Shows and Movies. Allworth Press. p. 51.
- "Meet the Characters: Mr.Krabs". Nickelodeon. Retrieved 2014-06-28.
- "Meet the Characters: Gary". Nickelodeon. 2008. Retrieved 2008-11-08.
- Mary Jo Catlett as the voice of Mrs. Puff via behindthevoiceactors.com
- "SpongeBob SquarePants: Naughty Nautical Neighbors/Boating School". Internet Movie Database. Retrieved 2012-07-31.
- L. A. Johnson (July 2, 2002). "'SpongeBob SquarePants' is soaking up viewers". Pittsburgh Post-Gazette. Retrieved 2009-02-07.
- Glen Weldon; Michael Kantor. Superheroes!:Capes cowls and the creation of comic book culture. p. 167.
- Park, Michael Y. (2002-10-09). "SpongeBob HotPants?". Fox News Channel. Retrieved 2008-11-09.
- Gary Strauss (May 17, 2002). "Life's good for SpongeBob". USA Today. Retrieved 2016-09-25.
- Kageyama, Yuri (2007-01-24). "SpongeBob Goes Trendy to Win Japan Fans". San Francisco Chronicle. Archived from the original on December 19, 2008. Retrieved 2008-11-08.
- Murphy, Ryan. "Top 10: Irritating '90s Cartoon Characters". AskMen. Retrieved 2008-11-08.
- Brown, Arthur (2008). Everything I Need to Know, I Learned from Cartoons!. Arthur Brown. p. 85. ISBN 978-1-4357-3248-3.
- "Official Boom Chicago "Back to Work!" page". Boomchicago.tv. Retrieved 2011-08-20.
- Finley, Adam (2007-01-01). "SpongeBong the banned". TV Squad. Retrieved 2009-11-13.