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SpongeBob SquarePants

 Voiced by: Tom Kenny

An outgoing sea sponge who lives in a pineapple under the sea, as the show's Theme Tune implies. Works as a fry cook at the Krusty Krab. Although not very bright, he has a good heart and constantly strives to help his friends...even when they don't really want it.

 Mr. Krabs: From now on the Krusty Krab is open 24 hours a day.

Squidward: But Mr. Krabs...!

Spongebob: Wooow! Now we never have to stop working!

Patrick Star

 Voiced by: Bill Fagerbakke

A not-quite-bright starfish who is SpongeBob's best friend.

Squidward Tentacles

 Voiced by: Rodger Bumpass

A cranky perfectionist octopus who works as a cashier at the Krusty Krab.

 Customer #1: You call this food!? My sandwich tastes like a fried boot!

Customer #2: My sandwich is a fried boot!

    • Don't forget this:

 Customer #1: He burnt my Krabby Patty.

Customer #2: He burnt my fries!

Customer #3: He burnt my shake.

  • Magma Man: As Captain Magma in Mermaid Man and Barnacle Boy V.
  • "No Respect" Guy: One episode revolves around Spongebob thinking Squidward has died and is now haunting him. When he arranges a funeral for him, where the guests have this to say:

  Mr. Krabs: Oh, Squidward...we came as soon as we were sure you were dead.

  • Only Sane Man
    • Not So Above It All: If Squidward does partake in Spongebob's tomfoolery, he'll end up taking the games too seriously, ruining them for everyone else.
  • Perpetual Frowner: In a stark contrast to Spongebob.
  • Pet the Dog: Sometimes shows compassion for others. "Pizza Delivery" is the most obvious where a fish pretty much crushes SpongeBob's spirit for no good reason and Squidward gets ticked off and shoves the pizza down the offender's throat. Interestingly, episodes like this downplay his Butt Monkey status considerably.
  • Red Eyes, Take Warning
  • Red Oni, Blue Oni: The blue to SpongeBob's red.
  • Small Name, Big Ego: Just to give you an idea -- all of Squidward's art projects are self-portraits.
  • The Spock
  • Straw Loser: Let's face it, it takes one heck of a Butt Monkey to make the likes of SpongeBob and Patrick look like winners.
  • Surrounded by Idiots
  • This Loser Is You: Probably the most Closer to Earth character in the show, though despite his superior logic and sanity over the rest of the cast, he is often depicted as a Small Name, Big Ego who is talentless and unexceptional in reality.
  • Ungrateful Bastard: In Squidtastic Voyage when he told SpongeBob and Patrick to leave his body without even a thank you for getting the reed out of his throat.
    • Also on Good Neighbors, Squidward had set up a security alarm in his house as SpongeBob and Patrick come in without any problem to give him an apology cake and apologize for unknowingly ruining his Sunday. But Squidward tries to get them kicked out instead of accepting their apology.
  • Voluntary Shapeshifting: Into a non-anthro octopus ("Squid's Day Off") and an amorphus liquid ("Suction Cup Symphony").

Mr. Krabs

 Voiced by: Clancy Brown

A scheming skinflint crustacean and owner of the Krusty Krab. His over-the-top greed and cheapness is played for laughs.

Sheldon Plankton

 Voiced by: Doug Lawrence

Krabs' business rival and arch-enemy. Is always after the formula for the Krabby Patty, the burger that SpongeBob fries up to the customers. Barring that, he ultimately aims for crushing all of Bikini Bottom beneath his feet.

  • Evil Laugh
  • Failure Is the Only Option: With an exception in 'Wishing You Well'.
  • Glad I Thought of It: He's guilty of this, especially when he takes an idea Karen says to him.
  • Harmless Villain: In FUN and Spy Buddies, he does nothing really evil.
  • Henpecked Husband: Has shades of this around Karen.
  • Impossible Thief: In one episode, Mr. Krabs tempts a "reformed" Plankton with a krabby patty. Despite the fact that the patty is always visible and untouched on the table throughout the exchange, it somehow ends up replaced with a cardboard cutout, which Krabs should have seen from his angle, even when it was propped up.
  • Ineffectual Sympathetic Villain: In later seasons, but it varies, as sometimes he manages to be the clear cut villain. Depending on the Writer.
  • Jerk with a Heart of Jerk: In the first season episode "FUN".
  • Last-Name Basis: Though in his case, he considers Sheldon an Embarrassing First Name. Unlike Mr. Krabs, he's simply called Plankton instead of Mr. Plankton (sans one episode where he sees what it's like if they switch places).
  • Laughably Evil
  • Lethal Chef: The reason why he doesn't have customers.
  • Likes Older Women: He is attracted to Mr. Krabs's mother in one episode.
  • The Napoleon -- Being constantly literally stepped on and flung around like a piece of trash will mess with a plankton's mind, man.
  • Nice Guys Finish Last: Says this word-for-word in "Walking Small".
  • Not So Harmless: In the movie and "Plankton's Army". There are other episodes that demonstrate this though.
  • Red Eyes, Take Warning
  • Smug Snake
  • Species Whole Name
  • Take Over the World: His secondary goal, Depending on the Writer.
  • Took a Level In Badass: After stint of Villain Decay Plankton returned to his threatening and menacing self by Season 7 and became much more competent villain. Particulary in episodes "Frozen Face-Off", "Spongebob's Last Stand" and even "One Coarse Meal'. In "Frozen Face-Off" he he organized entire race as a distraction just so he could steal Krabby Patty formula without trouble and to throw off the suspicion he placed his robot doppelganger to participate in the race and it took all the main characters to stop his evil plans. In "Spongebob's Last Stand" where he built a super highway, which directly led to Chum Bucket, and it drove away all jellyfish from their fields and took over entire town and almost all of Bikini Bottom's population supported him. It was so bad that Mr. Krabs was going to give him secret formula willingly. This and "Frozen Face-Off" are more dramatic and action packed episodes of the series. Even in "One Coarse Meal', where he was Driven to Suicide due to Krabs masquerading as Pearl and scaring him, Plankton was very effective villain. To clarify: he drops a powerful explosive the size of a TV remote on the Krusty Krab's roof; he is said to build a transmutator (a machine with the power to make an element in nature into another element, like iron into gold, fire into air, etc.); and a robotic bomb-shaped object that is actually a disguised, robotic, telescopic claw that can crush a sea creature. And during the end of episode, Plankton uses mime to scare Mr. Krabs, who is very afraid of mimes, as the revenge for Mr. Krabs scaring him and driving him to suicide and from looks of it, Mr. Krabs' fear of mimes is bigger than Plankton's fear of whales, since Plankton managed to remain rational while being scared by whales, while Mr. Krabs was completely irrational.
  • Took a Level In Dumbass: Sometimes. He varies from being on Sandy's level in terms of intelligence to being barely smarter than other characters.
  • Unknown Rival: Sometimes SpongeBob doesn't acknowledge him as an enemy.

Karen Plankton

 Voiced by: Jill Talley

A talking supercomputer who is Plankton's sidekick and wife. She provides him with evil plans to steal the Krabby Patty formula.

  • Actually Pretty Funny: Sometimes laughs with the good guys against Plankton.
  • AI Is a Crapshoot: Due to Flanderization, she becomes more of a Jerkass in the later seasons.
  • All There in the Script: Her name wasn't mentioned at all in the "Plankton!" episode, but it was listed in the credits.
  • Armless Biped: In the movie and most episodes from season 5-9, her mobile form does not have arms. From season 10 onwards, however, her mobile form always has them.
  • Beleaguered Assistant: She mostly averts this as she is generally the dominant one in the relationship.
  • Breakout Character: As mentioned above, Mr. Lawrence was responsible for turning the Planktons from one-off characters into main characters.
  • Character Development: She shows no signs of sentience in "Plankton!" but gains her personality in "F.U.N."
  • Cuteness Proximity: She gets so excited over how adorable Spot's puppies are in "Spot Returns" that she shuts down and spends several hours needing to be rebooted. When she comes back online and discovers even more puppies, she's even happier.
  • Deadpan Snarker: In the post-movie episodes, she snarks at Plankton all the time.
  • Equippable Ally: She is equippable with lasers, screensavers, and various software.
  • Flanderization: Her sentience and, to a lesser but still noticeable extent, her mannerisms. In the first season, she was always supportive of Plankton and focused on the mission. In the first movie, she became deadpan almost all of the time. While she has mostly reverted to her more cheerful demeanor as of season 9, she still shows signs of getting fed up with Plankton's ignorance at times.
    • One aspect of her personality that was completely phased out was her unquestioning servitude to Plankton. She always helps with his plans and gives them to him in most cases, but she no longer does whatever he says when he demands it.
    • An example of her unquestioning servitude can be seen in the Season 3 episode "The Algae's Always Greener". Plankton orders Karen to make him some dinner, so she gives him holographic meatloaf while saying—in a completely serious, non-sarcastic manner—"Yes, your majesty."
  • Green Eyes: Whenever she has eyes.
  • Hypercompetent Sidekick: She successfully stole a Krabby Patty the first time she tried alone, with near zero effort (then again, it was against Squidward).
  • Interspecies Romance: If a computer counts as a species, her and Plankton counts as a relationship between people of different species.
  • Jerkass Has a Point: Has her moments.
  • Just a Stupid Accent: Had a very obvious Brooklyn accent even before she had a personality.
  • Lack of Empathy: She even says to SpongeBob that she cannot feel for others because she physically does not have a heart.
  • No Celebrities Were Harmed: She vaugley sounds like Janeane Garofalo.
  • Non-Indicative Name: Her full name is Karen Plankton, but she's a computer, not a plankton.
  • Non Standard Character Design: Karen is the only one who is regularly drawn with wavy-lined borders instead of clean lines. This is because backgrounds and items in the show are normally drawn with wavy borders while characters aren't.
  • Pet the Dog/Jerk with a Heart of Gold: She is a computer but nevertheless has a very strong love for Plankton deep down.
  • Punch Clock Villain: Averted. See Beleaguered Assistant above.
  • Ridiculously-Human Robots: Played with. She supposedly has no heart but still feels a wide range of emotions. However, she still has some limitations such as being unable to eat (though she is turned into a Krabby Patty zombie in "Krabby Patty Creature Feature" when she is force-fed bits of the Krabby Patty zombies by having them stuffed into her disc drive).
  • Robotic Spouse: Yes and no. Yes, Karen is a robot and she married her creator. But no, Plankton did not create her just to marry her. She was originally just the security system for the business he and Mr. Krabs ran together, before they began dating naturally. Their romance even began before Plankton became evil, and Karen was so faithful to him that she became evil as well.
  • Satellite Character: She usually only interacts with Plankton and whoever else comes into the Chum Bucket. Justified, seeing as she's a mostly immobile computer who was permanently stationed in the Chum Bucket for the first four seasons.
  • Satellite Love Interest: Averted, since she wasn't written as Plankton's wife until Season 3 and is actually a formidable villain rather than just a love interest, having come up with almost all of Plankton's schemes herself.
  • Sir Not-Appearing-In-This-Trailer: She plays crucial roles in both movies (authoring and telling Plankton about "Plan Z" in the first, powering the time machine in the second) but did not have much screen time in the trailers for them. However, she was featured in the associated merchandise, such as the Mega Bloks time machine playset for the 2015 movie.
  • Snarky Inanimate Object: She's a computer and is pretty snarky in the later episodes.
  • Snarky Non-Human Sidekick: She's a computer who aids Plankton in his plans and is prone to making snide remarks toward him.
  • Talking Weapon: She has robotic abilities like lasers and death rays that make her a talking, walking weapon sometimes.
  • Tiny Guy, Huge Girl: The huge girl to Plankton's tiny guy.
  • Tuckerization: Named after the wife of series creator Stephen Hillenburg.
  • TV Head Robot: The head of her mobile unit looks a lot like a CRT television.
  • Women Are Wiser: She is much more clever and competent than her husband Plankton.

Sandy Cheeks

 Voiced by: Carolyn Lawrence

An athlete/scientist squirrel from Texas.

Mrs. Puff

 Voiced by: Mary Jo Catlett

SpongeBob's patient but paranoid teacher at boating school, who is a pufferfish.

  • Ambiguous Disorder: Several episodes demonstrate that SpongeBob's antics have taken quite the toll on her mental health. "Doing Time" ends with her having repeated hallucinations of the episode's beginning, and in "Krusty Love", she has a very PTSD-like reaction by just hearing SpongeBob's voice. Though she's still able to calm down when he points out they're not driving.
  • Adults Are Useless: Sort of. She's far more level headed than Spongebob, but she shows occasional incompetance as a teacher.
  • Ax Crazy: In "Demolition Doofus" when she becomes obsessed with attempting to get SpongeBob killed in a demolition match, and tries to kill him herself when that fails.
  • Butt Monkey
  • Closer to Earth: Despite the occasional dark tint, she's more level-headed than most of the other main characters. SpongeBob is constantly grating on her sanity however.
  • Dark and Troubled Past: According to at least one conversation, she has previously skipped town under a different name.
  • December-December Romance: She and Mr. Krabs are close to being senior citizens and have each been married before, but that doesn't stop them from falling in love and continuing to date (for nearly two decades, as revealed in Whirly Brains).
  • Didn't Think This Through: She falls victim to this in the episode "No Free Rides". Sick and tired of having to go through SpongeBob's chaotic driving tests, she comes up with a bogus extra credit test to just give him his driver's license and get him out of her classroom. It's only after she does so that it hits her that she has just given SpongeBob free reign to drive on public streets and wreak havoc there.
  • Establishing Character Moment: The first time we see her, in "Boating School" (episode 4), she is at her school watching SpongeBob dance around and says "I'm not ready..."
  • Nervous Wreck
  • Stepford Smiler

Pearl Krabs

Voiced by: Lori Alan

Mr. Krabs' beloved teenage daughter, who is a sperm whale.

  • Animals Not to Scale: She is a whale who's only twice the size of miniature creatures like starfish and crabs. Some international dubs justify this by claiming she is a baby whale, but she is 16 (mentally, at least).
  • Bratty Teenage Daughter: Depending on the writer in the more modern episodes.
  • Can't Get in Trouble For Nuthin': In "Bossy Boots", she goes to work for the Krusty Krab during her summer vacation, and makes multiple changes to the restaurant that effectively ruin her father's business. As it turns out, all the changes she made were because she was deliberately trying to get fired, but Krabs simply didn't have the heart to fire his own daughter. So SpongeBob, who was sent to fire her anyway, "pretends" to fire her so she could go and enjoy her summer vacation.
  • Distressed Damsel: in Dunces and Dragons
  • The Dreaded Pretend Tea Party: When SpongeBob enters her dream in "Sleepy Time" and sees that she's having a fake tea party, he asks her how to get to Mr. Krabs' dream instead.
  • Give Geeks a Chance: Her boyfriend was (unexpectedly) a nerdy little baitfish...although she describes him as incredibly "long, tan, and handsome"
  • Huge Schoolgirl: Considering she's a whale among little animals like starfish and squirrels.
  • Non Standard Character Design: She's the only one with monocular vision: eyes on the sides of her head rather than in front.
  • Out of Focus: In later seasons.
  • Valley Girl: Borderline Case -- she actually falls somewhere between this and a deconstruction of the Alpha Bitch.


 Voiced by: Tom Kenny

SpongeBob's pet snail, who meows like a cat.

Patchy the Pirate

 Voiced by: Tom Kenny

  • The Bus Came Back: He returns in "Feral Friends" after years of only appearing in commercials and in stop-motion form ("It's a SpongeBob Christmas!").
  • Butt Monkey: He gets a lot of misfortunes in the segments featuring him.
  • The Chew Toy: If something bad happens during his segments, it's usually him it'll happen to.
  • Dressed to Plunder: Wears the typical parts of a pirate costume, though he doesn't really do any actual plundering.
  • Excited Kids' Show Host: Especially since he's played by Tom Kenny.
  • Fanboy: He's the president of the SpongeBob fan club.
  • ManChild: He's a fully-grown man who's more obsessed with SpongeBob than most of the kids watching the show could ever be.
  • The Pirates Who Don't Do Anything: Despite being a pirate, we never see him doing any actual looting or plundering.
  • Pirate Parrot: Has an obnoxious parrot on his shoulder named Potty.
  • Straw Loser: He's an immature fanboy who has no life outside of SpongeBob. Nothing ever goes right for him, and Potty only seems to hang around him to make wisecracks at his expense. Even the narrator calls him a loser at the end of The Lost Episode.
  • Talk Like a Pirate: The accent and outfit go along well with it.
  • Token Human: Notably the only recurring character who is a live-action person.

Mermaid Man

 Voiced by: Ernest Borgnine

Barnacle Boy

 Voiced by: Tim Conway

The Flying Dutchman

 Voiced by: Brian Doyle-Murray

Realistic Fish Head

Larry the Lobster

 Voiced by: Doug Lawrence

Grandma SquarePants

 Voiced by: Marion Ross

Man Ray

 Voiced by: Bob Joles

Squilliam Fancyson

 Voiced by: Dee Bradley Baker

Squidward's rival from high school. Squilliam is essentially everything Squidward dreamed of being. Whereas Squidward is a middleclass jackass stuck in a deadend job and considered a joke by everyone except SpongeBob and Patrick, Squilliam is a successful, filthy stinking rich jackass beloved by all. He loves rubbing his success in Squidward's face.
  • Alternate Company Equivalent: To Remy Buxaplenty from The Fairly Odd Parents. Both are arrogant and insufferable millionaires who brag their lifestyle to the main characters.
  • The Bad Guy Wins: Won twice, but normally his appearences are a sign Squidward will win this one.
  • Eviler Than Thou: Well neither are exactly evil, but he's this to Squidward. Take Squidward, add some Smug Snake and several levels in jerkass, and remove any redeeming qualities. That's Squilliam.
  • Hate Sink: Squilliam has virtually no sympathetic qualities about him, making it all the easier for one to root for the normally jerkassy Squidward.
  • Hoist by His Own Petard: In "Band Geeks" and "House Fancy"
  • Humiliation Conga: In the iconic scene of "Band Geeks"
    • Gets another one at the end of "House Fancy".
  • Jerkass
  • Red Eyes, Take Warning
  • The Rival: To Squidward.
  • Screw the Rules, I Have Money
  • Shadow Archetype:
    • To Squidward of all people. Both are arrogant and snobbish cephalopods, but are opposites to each other in every way. On a positive light, he represents Squidward would be if SpongeBob wasn't around to bug him. In general, Squilliam is basically Squidward with no redeeming qualities.
    • To Mr. Krabs. While Krabs has an obsession with money and will go further lengths to satisfy his greed, Squilliam is a millionaire to begin with. He embodies Mr. Krabs' utter Lack of Empathy.
  • Smug Snake
  • Villainous Breakdown: At the end of "Band Geeks", he has one. Seeing Squidward completely succeed in an absolutely epic way causes him to have a heart attack!. Has another one at the end of "House Fancy" were Squidward's house being declared even fancier than his leaves Squilliam laying on the ground crying his eyes out.

Bubble Bass

 Voiced by: Dee Bradley Baker


 Voiced by: Dee Bradley Baker

SpongeBob and Patrick's creation, a crude doodle of SpongeBob come to life, and on an Unstoppable Rage.


An undead surfer fish who appears mostly in the background, but has some major roles.

The Dirty Bubble


A fish well known for saying "CHOCOLATE!"

Betsy Krabs

 Voiced by: Sirena Irwin

Uncle Sherm SquarePants


  • Catch Phrase: MY LEG!!! and DEAUUGH!!
  • Demoted to Extra: The blue version is rarely seen after the second movie.
    • Except in Season 7, the blue version is seen very commonly.
  • Palette Swap: He is in both brown and blue versions.
    • There is a brown-green version used only once, in Professor Squidward.

Blackjack SquarePants

 Voiced by: John Dimaggio

Grandpa Redbeard

 Voiced by: Dennis Quaid


 Voiced by: Thomas F. Wilson



The Cyclops

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