History Characters / CaptainUnderpants

* [[Characters/CaptainUnderpantsMainCharacters George Beard, Harold Hutchins, Mr. Krupp and Captain Underpants]]

* [[Characters/CaptainUnderpantsGeorgeBeardAndHaroldHutchins George Beard and Harold Hutchins]]
* [[Characters/CaptainUnderpantsMrKruppAndCaptainUnderpants Mr. Krupp and Captain Underpants]]

* [[Characters/CaptainUnderpantsOthers Others]]

* [[Characters/CaptainUnderpantsStudentsOfJeromeHorwitz The Students of Jerome Horwitz]]

[[foldercontrol]]

[[folder:Sulu]]
[[quoteright:122:https://static.tvtropes.org/pmwiki/pub/images/screen_shot_2016_02_07_at_74657_pm.png]]
[[caption-width-right:122:That's one badass hamster!]]
----
* BadassAdorable: He's a hamster who can lift objects twenty times his size with ease and singlehandedly beat down Melvin after he turned into a monster.
* BrainwashedAndCrazy: For a time thanks to [[EvilCounterpart Evil! George and Harold's]] 3D Hypno Ring.
* ComboPlatterPowers: Melvin programmed in a lot of powers into the robo-hamster he fused Sulu with. Once he became cybernetic, he gained SuperStrength, SuperSpeed, SuperToughness, EyeBeams, and {{Flight}}.
* {{Cyborg}}: A cyborg ''hamster''.
* FluffyTheTerrible: A little hamster who can beat people up and fight rampaging monsters.
* InterspeciesRomance: [[spoiler:He fathered some hamster-pterodactyl babies with Crackers.]]
* KilledOffForReal: [[spoiler:In Book 10 alongside Crackers when they [[HeroicSacrifice sacrifice themselves to save the world]] by sending Tippy to the time of the Big Bang while he was holding a bomb, resulting in all of them dying.]]
* LoyalAnimalCompanion: To George and Harold, when they take him in after he's abandoned by Melvin.
* RidiculouslyCuteCritter: An adorable hamster.
* TeamPet: Along with Crackers.
[[/folder]]

[[folder:Crackers]]
[[quoteright:205:https://static.tvtropes.org/pmwiki/pub/images/screen_shot_2016_02_07_at_74724_pm.png]]
[[caption-width-right:205:[[Film/JurassicPark Clever]] [[SamusIsAGirl girl.]]]]
----
* EverythingsBetterWithDinosaurs: A pterodactyl.
* InterspeciesRomance: [[spoiler:Revealed to have mated with Sulu and laid three eggs which hatched into hamster-pterodactyl babies.]]
* KilledOffForReal: [[spoiler:In Book 10 alongside Sulu. They both die in the explosion of Tippy holding a bomb while they were in the Big Bang.]]
* LoyalAnimalCompanion: To George and Harold, saving their lives on a number of occasions.
* SamusIsAGirl: [[spoiler:The reason why Evil!George and Harold's 3D Hypno-Ring didn't affect her when she and Sulu were captured by them in Book 8, though this only became truly obvious after Book 11]].
* TastesLikeFriendship: It became friendly to George and Harold after being lured with crackers, hence its name.
* TeamPet: Along with Sulu.
[[/folder]]

[[folder:Students of Jerome Horwitz Elementary]]


[[/folder]]
----

The children that attend the same school as George and Harold who were [[CanonForeigner introduced in the movie and animated series]]. They each have their own quirky personalities that help round out the cast and make school life at Jerome Horwitz more interesting.
!!Erica Wang
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/tumblr_pbzdmzxlpr1u86juso2_400.png]]
[[caption-width-right:200:The 'Strong Female Character' this show deserves]]
--> '''Voiced by:''' Erica Luttrel

A cool and confident girl who is often involved in the adventures of George and Harold. Erica often gives words of wisdom for the boys to follow and is always three steps ahead of everyone on different occasions.
----
* TheAce: Based on Melvin's account, she's one of the top students at Jerome Horwitz and is involved in various clubs along with being president of several of them. Based on George and Harold's account, they think of her as being on a whole different level of cool. They even describe her as Batman [[TakeThat without the angry grumbling]].
* AmbiguousSituation: [[spoiler:In episode 11, she somehow remembers (and keeps an object from) the "Krupp is a CorruptCorporateExecutive" timeline, hinting that there's more to her than we thought.]]
** In the season 2 finale, it's implied that [[spoiler: she knows so much thanks to receiving help from her future self]].
* BadassNormal: As [[spoiler: Plungerina. Even though she lacks Captain Underpants' powers, she can still kick major villain butt]].
* BigGood: [[spoiler: Her future self is revealed to be this since she ends up becoming the President of Earth and manages to achieve world peace 2 years into her presidency. She also tells Melvin that he can guarantee himself a successful future if he makes the effort to change himself for the better]].
* BrutalHonesty: Erica's unafraid to voice her opinions when it comes to George and Harold's antics. She openly tells them that their writing of female characters is offensive and is infuriating the female demographic. She also tells them that they don't have what it takes to get away with suspension like her.
* {{Catchphrase}}: When she isn’t pulling a StealthHiBye, she usually says “I’m out” whenever she leaves.
* CoolBigSis: She fills out this role to the other kids in the BadFuture timeline. She also has these moments when interacting with George and Harold.
* TheCowl: [[spoiler: She takes on the identity ''Plungerina'' to try her hand at superheroics and proves to be very great at it]].
* DarkHorseVictory: [[spoiler:Pulls this in the season 2 finale; George, Harold, and Melvin are so preoccupied with the nanobots and each other that they don't realize that they're not the only students left in the dome, and as a result she steals victory from them at the last moment.]]
* FutureBadass: [[spoiler:Apparently grows up to become the President of Earth and achieve world peace.]]
* [[EvilCounterpart Good Counterpart]]: To Melvin. While Erica is one of the most intelligent kids at Jerome Horwitz who cares about her academic career, she has a good heart and is always looking out for her friends; unlike Melvin who only cares about himself. And while she does make critical remarks towards George and Harold regarding their shenanigans (just like Melvin), it usually comes out of genuine concern and the desire to help them learn from their mistakes (unlike Melvin who only criticizes just for the sake of feeling superior). This even extends to [[spoiler: their future counterparts. Future!Erica had little involvement in the present timeline but helped just enough so that Present!Erica could succeed on her own; Future!Melvin was overbearing towards his present self and made many decisions on his own to ensure that Present!Melvin would enter Elitenati Academy]].
* {{Main/Hammerspace}}: Where is she getting all that ice cream from?
* TheLeader: More often then not she'll lead the student body during times of crisis. In the bad timeline episode, George and Harold state that getting her to help will mean that everyone else will help too.
* MixedAncestry: She's clearly African American but her last name suggests that she has a Chinese parent.
* [[OnlySaneMan Only Sane Girl]]: Out of the rest of the cast, she’s the most level-headed.
* ThePerfectionist: An amicable example. She's responsible with her academics and wouldn't do anything dangerous or stupid to jeopardize her current standing. She even admits that she intends to be a senator when she grows up.
* TheSmartGirl: She's hyper intelligent and knows more about a given situation then the others. Lampshaded when the boys hire her to be the ''Thinks'' for M.I.S.F.A.R.T.S.
* StealthHiBye: She has a habit of popping in and out of scenes much to the confusion of the boys.
* {{Main/Tritagonist}}: Arguably the most prominent character in the series after the boys and Krupp/CU as she often plays a role in their adventures and [[spoiler: is implied to be more than what she appears to be]].
* {{Main/Troll}}: She likes to pull pranks on the boys, especially in episodes 4 and 9, claiming that the best way to make a prank is to 'prank a prankster'. [[spoiler: She even admits in episode 9 that she was never suspended at all and just wanted to mess with them]].
* UnwittingInstigatorOfDoom: She was the one who [[spoiler:suggested to George and Harold that they go to Superintendent Vil Endenemys to try to get Mr. Krupp fired before he can expel them, not knowing that Vil Endenemys is actually Melvin Sneedly’s future self, who not only fires Krupp, but expels George and Harold and then takes over the school with Melvin]].
* WomenAreWiser: She's one of the more level headed girls on the show and the boys often go to her for help during their misadventures.

!!Jessica Gordon and the Sophies
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/cap_pd101_01063605_rgb.JPG]]
[[caption-width-right:350:Left to Right (Other Sophie, Jessica, Sophie 1)]]
--> '''Voiced by:''' Dayci Brookshire

The popular girls of the school. Jessica and her crew often engage in their own girly affairs but will more often then not become involved in the wild antics of the show.
----
* AscendedExtra: Jessica has more speaking lines in Season 2.
* BeehiveHairdo: It’s bigger than ''her entire body''!
* TheChick: She and the other Sophies fill this role when they join M.I.S.F.A.R.T.S.
* GirlPosse: Jessica is always shown in the company of Sophie 1 and Other Sophie.
* HeroOfAnotherStory: In episode 10, after getting amnesia from the memory wipes, she and her crew become involved in [[spoiler: protecting the whales. They end up ditching school to protect them from whale hunters and even get to ride with them in the end]].
* ImprobableHairStyle: There's no way she can get her hair to be that big everyday and walk around like it's no big deal.
* ItIsPronouncedTroPAY: She pronounces “hair” as ''haar''.
* TheLeader: She takes on this role when the school is attacked by an angry swarm of Butt-erflies.
* LovableAlphaBitch: She has her mean girl moments, especially towards [[ButtMonkey Other Sophie]], but she's still very likable.
* MonsterOfTheWeek: Thanks to [[{{Main/Jerkass}} Melvin]] using her as a test subject for his new ray gun, Jessica turns into ''Messica Gorgon'' the [[OurVampiresAreDifferent Vimpire]].
* PinkMeansFeminine: Befitting her archetype, her main color is hot pink.
* RaceLift: In the book series she was white. Here, she's African American.
* RapunzelHair: [[CaptainObvious Try to guess]].
* [[SatelliteCharacter Satellite Characters]]: The Sophies only exist to serve as Jessica's clique. They haven't even spoken a single word in their appearances.
* ValleyGirl: Speaks in this tone of voice.

!! Steve "Gooch" Yamaguchi
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/tumblr_pbze2mmqgy1u86juso4_250.png]]
--> '''Voiced by:''' Evan Kishiyama

An adorable boy [[ButtMonkey who attracts misfortune to himself]] and is a good friend of the boys.
----
* {{Main/Adorkable}}: He definitely has these moments.
* AnimalsHateHim: Season 2 often features the poor boy in the jaws of a vicious animal.
* AsianAndNerdy: Played with. He's of Japanese descent and pretty dorky, but he defies the stereotype since studying isn't his strength or something he enjoys.
* ButtMonkey: The most likely to suffer some sort of physical abuse in an episode.
* GadgeteerGenius: Subverted. The boys give him the role as tech genius for M.I.S.F.A.R.T.S. by process of elimination. And Gooch makes it constantly clear that he has no tech skills to save himself or anyone for that matter.
* HeroOfAnotherStory: Gooch is shown to be involved in some peculiar situations while the boys are in the middle of their adventures.
* HiddenDepths: He knows how to play the organ along with the pan flute.
* InSeriesNickname: His real name is Steve but everyone calls him ''Gooch''.
* InTouchWithHisFeminineSide: He wears a pink collared shirt and isn't afraid to cry or express how he's feeling.
* {{Main/Keet}}: He's a very cheerful child.
* SuspiciouslySimilarSubstitute: Appearance-wise, Gooch bears alot of similarities to [[spoiler: Billy Doanbee-Ahiro, Harold's future husband]] if he were a child.
* WhatTheHellHero: He calls out the boys for going too far in representing Erica as a monster vampire for their comics.

!!Dressy Killman
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/tumblr_pegnah32mb1v5r6c4o3_250.png]]
--> '''Voiced by:''' Dayci Brookshire

A mellow and cheerful young girl who could very well pass for a hippie and is another friend of the boys.
----
* CharacterTic: She has a habit of singing out the last word of a sentence she's speaking.
* DidYouJustFlipOffCthulhu: She threw a dodgeball directly at Krupp's face to keep him from taking her comic book and faced no consequences for it.
* NeatFreak: [[WordOfGod According to the official guidebook]], she despises pranks, mischief, and messes.
* NewAgeRetroHippie: Her outfit, and the music she plays when auditioning as DJ for the school dance in episode 2, makes her come off as this.
* QuirkyCurls: Her orange hair is long and fluffy to portray her free spirit.
* WickedCultured: In episode 2 of Season 2, Dressy shows alot of knowledge when it comes to Ecuador since she and her parents often travel.
* YouthfulFreckles: She sports some on her face.

!!Bo Hweemuth
[[quoteright:234:https://static.tvtropes.org/pmwiki/pub/images/babyboy.JPG]]
[[caption-width-right:234:Baby boy. Baby.]]
--> '''Voiced by:''' Brennan Murray

A talented, good-hearted sculptor who wishes to have friends. He was initially alone because of all the rumors that painted him as a powerful but dangerous legend which made everyone afraid of him.
----
* AscendedFanboy: He's a huge fan of Captain Underpants and was flattered when George and Harold made him the villain in their comic book. [[spoiler: By the end of the episode, he now works with the boys in making Captain Underpants toys for the student body]].
* TheBigGuy: Because of Bo's large size, he's given the role of ''Bigs'' for the M.I.S.F.A.R.T.S.
* BlindingBangs: We don't know what his eyes look like thanks to these.
* FaceOfAThug: His gruff appearance makes him come off as a bully figure.
* FriendToAllLivingThings: At one point, Dressy tells George and Harold that she saw him save a ladybug from a spider’s web.
* GentleGiant: He’s quite a bit bigger than most of his classmates, but is a soft-hearted soul who wouldn't hurt a fly.
* HiddenDepths: Along with being a gifted sculptor, he knows how to play the banjo. It’s also hinted that he has some mechanical knowledge, as he helped Gooch fix a bicycle.
* IJustWantToHaveFriends: He earnestly wishes for this and is touched when George and Harold still want to be friends with him even after his rampage as ''Claylossus''. [[spoiler: They even have him involved in Treehouse Comix Inc. by making him the head of toy development]].
* MisunderstoodLonerWithAHeartOfGold: Before befriending George and Harold, he spent most of his time in the school’s abandoned ceramics studio, and there were enough rumors about him to make a whole horror movie franchise, but he’s really just a big sweetie.
* MonsterOfTheWeek: Was turned into the clay monster ''Claylossus'' against his will, courtesy of [[{{Main/Jerkass}} Melvin]].
* NiceHat: He wears an orange toque for a hat.
* PunnyName: His name is a play on the word “behemoth”.
* UnwittingPawn: Mr. Krupp uses Bo's reputation as an unworldy bully in order to terrorize the other kids into submission as “scared children are good children”.

!!Stanley Peets
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/download_132.jpg]]
--> '''Voiced by:''' Jorge Diaz

A sweaty farm boy who is known for having plants growing out of his armpits.
----
* BodyHorror: Stanley has avocado plants growing out of his armpits. Apparently it's a common trait among his family.
* DeepSouth: He has a thick Southern accent.
* DemotedToExtra: He hardly has a presence in Season 2. The most he gets is a silent cameo in a single episode.
* FarmBoy: He and his family run a successful farm that specializes in bountiful produce.
* YouGottaHaveBlueHair: His hair is dark green, and it’s as soaked in sweat as the rest of him.

!!Tommy
[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/tumblr_ow0uq3ohua1u86juso5_250.png]]
--> '''Voiced by:''' David Soren

A boy who is seen frequently throughout the movie hiding in his own locker.
----
* CanonForeigner: He's the only named minor student from the movie.
* TheEeyore: He's depressed for a majority of the movie.
* RunningGag: Throughout the movie, he locks himself in his locker to wallow in despair.
* SmallRoleBigImpact: Tommy's existence is to remind George and Harold, and the viewers, as to what can happen to the children of Jerome Horwitz who succumb to Krupp's totalitarian rule.
* [[WhenSheSmiles When He Smiles]]: He gives a very heartwarming smile when the atmosphere of the school changes for the better.
* YouthfulFreckles: Has some across his face.

[[folder:Melvin Sneedly]]
[[quoteright:184:https://static.tvtropes.org/pmwiki/pub/images/f739f0a8_df01_4c75_b65d_6d57a2e4771d.png]]
[[caption-width-right:184: Grade-A Suck Up]]
-->'''Voiced by:''' Creator/JordanPeele (movie), Jorge Diaz (animated series)

George and Harold's brainy classmate, he first appeared in book 2 and as a background character in later books, before he became more integral to the plot (and TookALevelInJerkass to boot).

* TheAce: The smartest student in Jerome Horwitz Elementary school.
* AdaptationalHeroism: While still annoyed with George and Harold's antics in the movie, Melvin has no plans on making them his slaves or is as much of a major villain as his book counterpart. His most evil moments is mostly his [[UnwittingPawn assistance with Professor Poopypants' anti-laughter machine for extra credit.]]
* AdaptationalVillainy: However, he ends up on the other side of the scale in the animated series. He's more selfish, arrogant, petty and ill tempered towards the boys and everyone else at the school. Most of the chaos that ends up happening in a given episode is more often then not because of his involvement.
* AnArmAndALeg: [[spoiler: The reason as to why Future!Melvin is a cyborg is because he was attacked by a swarm of Butt-erflies, sent to the future by George and Harold, that led to a fatal car crash that ruined the right side of his body]].
* ArchEnemy: He hates George and Harold as much as Mr. Krupp, if not more, because of their pranks constantly disrupting his need to uphold the rules. In fact, Book 6 has him fantasizing about making them his personal slaves.
* ArcVillain: He arguably fits this role in the first season of the animated series as every catastrophic event, along with several of the [[MonsterOfTheWeek villains of the week]], can be traced back to his inventions, his selfish desires, or ''both''. [[spoiler: He continues this role in season 2 after he and his future counterpart take over the school and do everything in their power to try and get present!Melvin accepted into Elitenati Academy]].
* BadPeopleAbuseAnimals: He tries to spank his pet hamster Sulu with a ping-pong paddle for not obeying his orders. Since he has just used a fusion machine to combine Sulu with a robot hamster and given him super strength, [[TheDogBitesBack this ends badly.]]
** This carries on in the animated series aswell. For a science project, Melvin is given a hyper intelligent chimp named 'Edwin' whom he trains to perform various intelligence themed challenges without properly rewarding him for his efforts. [[spoiler: This bites him in the butt at the end where Edwin forfeits the first place ribbon Melvin ''supposedly'' won and gives it to George and Harold for their own project. And earlier Edwin did attack him after being fed up with Melvin teasing him with the promise of ice cream]].
* BerserkButton: As the Bionic Booger Boy, he's still mostly the normal Melvin up until tissues are mentioned. [[HulkOut Things quickly went downhill from there]].
* ButtMonkey: Gets put through a HumiliationConga in Book 6 by George and Harold out of a RevengeByProxy for what he did to them. Even besides that, he tends to be on the receiving end of George and Harold's pranks.
* CassandraTruth: In ''Captain Underpants and the Attack of the Talking Toilets,'' he shows George and Harold his newest invention, the Photo-Atomic Trans-Somgobulating Yectofantriplutoniczanziptomiser (PATSY 2000), which can convert 2D images into living beings, and demonstrates by using it to turn a photo of a mouse into a real mouse. They don't believe him, and think that it's just a regular photocopier that he put a real mouse into so he could trick them. Lo and behold, when they use the "photocopier" to try and print copies of their newest comic book about Captain Underpants and the Talking Toilets, it ends up creating an army of evil Talking Toilets and the Turbo Toilet 2000. OhCrap.
* {{Catchphrase}}: "You're so immature."
** In George and Harold's comics, he has a couple: "I'm telling", and "I'm a dumb nerd".
** The movie has him saying, "I don't get it." whenever a joke occurs that the other kids find funny in which he does not.
* ChildProdigy: Vastly intelligent despite his elementary school age, and seemingly smarter than his parents.
* ADayInTheLimelight: Book 6 and 7 center around him.
* DisappearedDad: In the animated series. Unlike in the books, it’s heavily implied that it’s only him and his mother in the Sneedly household, as [[ChuckCunninghamSyndrome his father is inexplicably never seen or mentioned]].
* DitzyGenius: As impossibly smart as he is, he wasn't able to tell Mr. Krupp wore a toupee over his bald head. George sarcastically states he thought Melvin was supposed to be gifted. He also [[LawfulStupid always falls for]] the signs that George and Harold change around, including one that told him to ''[[{{Squick}} wash his hands in the toilet]]''.
* TheDragon: Frequently to Mr. Krupp whenever he's at odds with George and Harold.
** He serves this role to not only Mr. Krupp in the movie, but to Professor Poopypants.
** In the animated series, he’s served this role to at least three people so far! Most of the time, it’s Mr. Krupp, like always. Then in episode 10, he served as this to Ted Murdsley, and ''then'' at the end of the Season 1 finale, becomes this to [[spoiler:''[[MyFutureSelfAndMe his own future self]]'']]!
* EnemyMine: [[spoiler: In the season 2 finale, after learning that George and Harold aren't interested in Elitenati Academy and only want to go to summer camp, Melvin decides to stop antagonizing them for the rest of the finale and helps them defeat the out of control nanobots along with his future self]].
* EveryoneHasStandards: Despite [[ProfessionalButtKisser his constant sucking up to the teachers,]] even he looked less than pleased when Mr. Krupp and Ms. Ribble were announced to be getting married in Book 5.
** In the Season 2 finale, [[spoiler: he is horrified when his future self plans to betray George and Harold (after they just saved the day, no less) and basically ''leave them to die''.]]
* EvenBadMenLoveTheirMamas: He does love his parents and gets happy to see them in book 7 safe.
* EvilRedhead: Made more obvious in the movie, due to the book illustrations being black and white
* FreudianExcuse: It's implied that the reason why Melvin likes to kiss up to his teachers and authority figures at his elementary school is because his own parents don't pay much attention to him at home. So him getting close to the adults at his school is probably him trying to find a replacement parental figure.
* FusionDance: Book 6 has him deciding to combine himself with a KillerRobot. Unfortunately for him, he accidentally sneezes at the last second, adding his boogers to the mix and turning himself into the Bionic Booger Boy.
* FutureMeScaresMe: It's actually more along the lines of Future Me [[spoiler: ''Infuriates'' Me. As Season 2 progresses, Melvin begins to lose patience with his future self because of his complicated plans that always backfire and how he always underestimates George and Harold despite their success rate. It gets to the point that he's had enough of himself and [[FateWorseThanDeath wipes him out of existence]]]].
* GloryHound: He really enjoys having Captain Underpants' powers and being seen as the hero.
* HorribleJudgeOfCharacter: In the movie. He sucks up to and helps Professor Poopypants with his plan to eliminate laughter, despite the fact that the man is clearly ''insane''!
** In the animated series, [[spoiler: his future self is this. No matter how many times George and Harold successfully foil his convoluted schemes with their abilities and dumb luck, MelvinBorg doesn't think much of it and brushes them off as hopeless children. This is something that his present self is aware of and constantly chastises him for it]].
* HulkSpeak: In his Bionic Booger Boy form.
* ImpossibleGenius: His inventions are not only advanced, but sometimes scientifically impossible (though given what series he's in, the laws of physics and science probably only apply slightly more than they do in a Bugs Bunny cartoon). He can effortlessly create killer robots, a photocopier that turns 2D images into ''living beings,'' a [[FusionDance fusion machine]], a separation machine, a [[LaserGuidedAmnesia memory-wiping machine,]] and a time machine (which apparently was easy to build).
* InsufferableGenius: He was based off of an annoying nerd that Pilkey knew back in middle school.
* {{Jerkass}}: He has his legitimate points, but he can be a complete dick.
* JerkassHasAPoint: While he went about it in his typical obnoxious way, Melvin was pretty justified in snitching on George and Harold for ruining the science fair in book 2.
* LaserGuidedKarma: He does become a victim of this often. In book 7, for selfishly putting himself over the fate of the planet, he gets misblamed for the things that Captain Underpants did in his body & gets chased by an angry mob.
* MuggingTheMonster: In book 11, he angrily shouts at the Turbo Toilet 2000 to be quiet. Cue the Turbo Toilet 2000 chasing after Melvin.
* NerdGlasses: He's the school nerd, so it's expected that he would have glasses.
* NoSenseOfHumor: As mentioned above, he is the only one who doesn't get the joke whenever the other kids find something funny. [[spoiler: In [[WesternAnimation/CaptainUnderpantsTheFirstEpicMovie the movie]], this is because his brain lacks a "Haha-Guffaw-Chucklotamus", the part of a child's brain that controls the ability to laugh. Professor Poopypants uses him as a tool to wipe out the kids' happiness and joy.]]
** Subverted in the animated series. It’s not that he has no sense of humor, it’s that he has a '''dull''' sense of humor. According to him, videos of ''rotting food'' are “can’t miss comedy”.
* NotSoAboveItAll: In Book 4, he is seen laughing with all the other fourth graders when Professor Poopypants introduces himself to the class.
* ParentsAsPeople: Melvin's parents are shown to be too busy to spend time with their son. Melvin does, however, still love them. This is one of his redeeming qualities.
* PlotAllergy: In Book 6. Even though it’s only briefly mentioned, it’s his allergy to his family’s cat, Danderella, that causes him to sneeze when attempting to use his Combine-O-Tron 2000 on himself, turning him into the Bionic Booger Boy.
* TheRival: Comes off as this to George & Harold.
* SignificantBirthDate: According to [[WordOfGod Dav Pilkey]], Melvin was born on December 25.
* SkewedPriorities: In Book 7, [[spoiler: when he steals Captain Underpants' superpowers, he refuses to fight the Booger Bots due to his childish concern of his depiction in George & Harold's comics. Unless the boys change how Melvin is depicted, Melvin would leave the world to die]].
** In the movie, there's a moment where he actually has a hard time choosing between getting extra credit and ''surviving''.
%% * SmugSnake:
* TheStoolPigeon: Melvin is also known to be a snitch.
** He is usually the Petty Peter or the Snobby Simon depending on the book. He was the Concerned Corey (along with the Snobby Simon because while justified, he still enjoyed seeing George and Harold get into trouble) in book 2 when George and Harold sabotaged a science fair out of spite because they were not allowed to participate.
** In the movie, he even invents a device called the "Tattle Turtle 200," which exposed George and Harold for causing his Turbo Toilet 2000 invention to malfunction.
* TookALevelInJerkass: Oh yeah. He wasn't wholly unlikable in Book 2 and him breaking his deal with George and Harold was somewhat justified. Fast forward to books 6 and 7 and he's a complete {{jerkass}} when he finds out, whilst trapped in Mr. Krupp's body, about Captain Underpants' real identity and blackmails George and Harold in transferring his powers into him. Once he does manage to steal the Captain's superpowers, he refuses to help fight the Booger Bots unless George and Harold changed the comic to have him defeating Captain Underpants.
** This is TurnedUpToEleven in the animated series. [[spoiler:In the second half of the first season, he becomes so obsessed with attending his dream school, Eliteanati Academy, that he is willing to do just about ''anything'' to get accepted into it. He even [[MakeYourOwnMonster turns Bo Hweemuth into a literal monster so the kids will still fear him]], all so Mr. Krupp would write a recommendation letter to said academy for him, but [[EvenEvilHasStandards even]] ''[[EvenEvilHasStandards Mr. Krupp]]'' [[EvenEvilHasStandards thought Melvin had gone too far]]! Then in the season finale, [[WhamEpisode he gets Mr. Krupp fired, George and Harold expelled, and takes over the school with his future self]]!]]
* VillainousCrush: Has one on [[CanonForeigner Erica Wang]] in the animated series. But given his reputation, it’s highly unlikely that she reciprocates it.
[[/folder]]


[[/folder]]

[[folder:Professor Pippy P. Poopypants/Tippy Tinkletrousers]]
[[quoteright:206:https://static.tvtropes.org/pmwiki/pub/images/latest__3_jpg.png]]
[[caption-width-right:206:[[BerserkButton Don't make fun of]] [[SchmuckBait his name.]]]]
-->'''Voiced by:''' Nick Kroll

A brilliant scientist from New Swissland who turned to villainy after being made fun of because of his ridiculous name one too many times by the world and children of all ages. He is a recurring villain that the boys and Captain Underpants have to face on various occasions.

* AdaptationNameChange: Renamed "Pee Pee Diarrheastein Poopypants Esquire" in the movie, which, props to the creators of the film for taking a name like "Professor Poopypants," and somehow making it ''so much worse.''
* AdaptationalVillainy: In the movie, he isn't [[SanitySlippage driven to craziness]] from George and Harold's tricks, he is already a villain to begin with. His backstory reveals he'd already snapped when [[spoiler:the presenters at the Nobel prize ceremony were too busy laughing at his name to give him his well-deserved award]].
* AffablyEvil: In the movie, he's quite cheery as far as mad scientists go, even if he wants to wipe laughter off the face of the planet. Until you make fun of his name...
* AlasPoorVillain: Sympathy for him may vary since he does lose sight of his goal (as well as his sanity) as the books go on. But when it all comes down to it, he was a legitimately brilliant man with actual qualifications. Heck, he designed a shrink ray and a growth ray to get rid of the world's garbage problems (by shrinking it to nothingness) and ''solve world hunger'' (by making all the food super-sized). All he originally wanted was to teach people about science, only for them to not give two shits because he had a funny sounding name. Even George and Harold themselves had to admit that his villain origins could have been avoided if they didn't make fun of him.
* AlliterativeName: Pippy Pee Pee Poopypants, and later Tippy Tinkletrousers.
* AsLongAsItSoundsForeign: Hails from the country of New Swissland, where everybody has ridiculous names.
* BagOfHolding: His briefcase in TheMovie.
* BeenThereShapedHistory: His meddling with time was what inadvertently wiped out the dinosaurs, caused the Ice Age, and creates the Big Bang that stated the universe.
* BerserkButton: He doesn't take people making fun of his name very well, as the whole of Jerome Horvitz learned the hard way. In the movie, the woman presenting Nobel Prizes learned this ''much'' earlier.
** In the movie, he doesn't like children laughing to the point that it becomes part of his EvilPlan to stop kids from laughing forever.
* BigBad: Of Book 4, 9, and 10 and in TheMovie.
* ButtMonkey: Constantly made fun of in his debut. He's also a ButtMonkey in the movie.
* CardCarryingVillain: He doesn't even ''try'' to be subtle in the movie. [[HorribleJudgeOfCharacter Captain Underpants has a good feeling about him anyway.]]
* ChronicBackstabbingDisorder: During his reappearance, he abuses time-travel twice to solve his problems, creating "clones" of himself. All three clones betray the others at the first opportunity. When Harold and George are arguing about how to get home, one of them points out that they can't trust him, since '''he can't trust ''himself'''''.
* ComicallyMissingThePoint: At the end of Book 4, he decides to take George and Harold's advice to change his name so people won't laugh at him anymore. He decides to rename himself "Tippy Tinkletrousers".
* TheComicallySerious: He wants to be taken seriously by the scientific community, but it's not exactly easy with a name like "Pippy P. Poopypants". It really doesn't help that he doesn't ''realize'' it's an {{Unfortunate Name|s}}, since everyone in his country has a silly name.
* TheCynic: In the movie. He claims that a student's dream of world peace is "unattainable", and scoffs at Melvin's claim that "real power comes from within".
* DeadpanSnarker: The movie gives him a few snarky moments when he's not ChewingTheScenery like it's going out of style.
--> "Oh, look at this. We've got a grade-A suck-up. Good to know, good to know."
* EinsteinHair: He has poofy hair that matches his MadScientist look.
* EvilIsHammy: See LargeHam.
* FreudianExcuse: People laughing at his name all the time led him to villainy.
* GenreBlindness: In the books, he took up a position as a teacher at an elementary school, believing that children were sweet and innocent and wouldn't laugh at his name. He was wrong. ''So very, very wrong.''
* HerrDoktor: The movie gives him a heavy German accent.
* {{Hypocrite}}: He wants to rid the world of laughter, yet he frequently indulges in [[EvilLaugh evil laughter]], and even has a film of bloopers that he finds amusing.
* AnIcePerson: He created a freeze ray in Book 8.
* ImpossibleGenius: Has mastered sizechanging technology and time travel.
* InsufferableGenius: He's pretty egotistical about his inventions.
* KarmicDeath: [[spoiler: For attempting to blow up the planet, Tippy gets killed off permanently]].
* KilledOffForReal: [[spoiler:In book 9, three separate times at that.]]
* LargeHam: Voiced by Nick Kroll, and it shows.
* MadScientist: He likes to invent, but he's not so mad until his SanitySlippage.
** Played straight in TheMovie at his insistence:
-->'''George:''' (''reading his resume'') It says here that you were a "genius inventor"?
-->'''Poopypants:''' (''slamming a mace down into the desk'') '''''Mad''''' genius inventor!
* MakeMyMonsterGrow: His Goosy-Grow 4000 can make things bigger, including his MiniMecha which he turns into a HumongousMecha.
* MeaningfulRename: After attempting to give everyone in the world silly names, Professor Poopypants is advised by George and Harold to change his own name instead. Calling himself Tippy Tinkletrousers did not improve his situation.
* NiceJobFixingItVillain: When he goes back in time, he accidentally prevents Captain Underpants from ever existing, resulting in a BadFuture where all of the threats that Captain Underpants had stopped are now in play. He realizes his mistake and goes to fix it.
** In the movie, [[spoiler:He does this ''twice in a row''. The first time was when he had the Turbo Toilet 2000 "eat" Captain Underpants. In doing so, he exposed CU to the pretty much radioactive leftovers from the school cafeteria, and it ultimately results in him getting ''real'' superpowers. The second time is when he's seemingly won after erasing George and Harold's sense of humor. He mentions the planet Uranus, which triggers the memory of how George and Harold first met, and gets them laughing again, which destroys the Anti-Humor machine and undoes its effects on the rest of the school]].
* OmnicidalManiac: Attempted to [[spoiler: destroy the planet in book 10]].
* OverarchingVillain: The most recurring villain of the books.
* RecurringBoss: He's the one villain who keeps coming back over and over.
* SanitySlippage: From well-meaning, brilliant scientist hoping to solve all the problems in the world or at least to teach young children the joy of science, to a crazy person hoping to give everyone in the world a name as silly as his, [[spoiler: to a balls-out lunatic willing to do anything necessary to kill Harold and George, to an OmnicidalManiac]]. Whoa! This is even more prominent in the movie, where [[spoiler: he wants to eliminate all humor so no one will ever laugh at his name.]]
* ShrinkRay: His Shrinky-Pig 2000.
* SignificantBirthDate: Of the ironic variety in the movie. Thanks to a FreezeFrameBonus, you see on his resumé that he was born on ''AprilFoolsDay'', of all days!
* ShutUpKirk: In the movie, when George and Harold try to talk him down.
-->'''George:''' Your problem isn't that people laugh at you, but that you can't laugh at yourself.\\
'''Poopypants:''' Oh, really, [[Series/TheOprahWinfreyShow Oprah]]? Is that my problem?!
* StatingTheSimpleSolution: It takes two fourth graders to point out that it ''might'' have been easier to just change his name instead of holding the world hostage with shrink rays and HumongousMecha. He claims he never even thought of that.
* ThenLetMeBeEvil: George and Harold write a comic book about him trying to take over the world, and he finds a copy of it, suffers a psychotic break after reading it, and decides to actually take over the world. [[NiceJobBreakingItHero Nice job breaking it, George and Harold!]]
** In the movie:
-->'''Poopypants:''' So George and Harold want a super villain, huh? Well ask and he shall ''RECEIVE''!!
** In the movie, he even changes his outfit to match the one that George and Harold made for the comics.
* UnfortunateNames: Just read it. The new name he gives himself (Tippy Tinkletrousers) is only slightly less embarrassing.
** In the movie, it's [[AdaptationNameChange changed]] to Pee Pee Diarrheastein Poopypants Esquire, which is ''even worse.''
* VillainProtagonist: Of Book 9.
* WouldHurtAChild: He was all too willing to hurt George & Harold in book 4, 9, and 10.
[[/folder]]

[[folder:Evil George, Evil Harold, and Captain Blunderpants]]
[[quoteright:185:https://static.tvtropes.org/pmwiki/pub/images/nice_krupp_is_now_the_mean_captain_blunderpants.png]]
[[caption-width-right:185:[[{{Film/Us}} "We are our own worst enemy."]]]]

The Purple Potty counterparts of our heroes. Rotten to the core, they enjoy using their supervillain creation to do whatever sinister schemes they want.

* EvilCounterpart: Evil George and Harold are mean-spirited and wicked children who make their own comic books. However, they are actually more talented than their good counterparts, creating much better drawn comics with proper spelling and grammar. Inverted with Mr. Krupp, who is a nice principal with a good sense of humor.
* EvilTwin: That pretty much goes without saying.
* KarmaHoudini: [[spoiler: Even after being defeated by the Arthritic Avengers and being sent back to their universe, it's more than likely that they'll go back to terrorizing their world with Captain Blunderpants. They even manage to get their good counterparts arrested for the crimes they committed in the main universe]].
* WeaksauceWeakness: Probably even moreso than Captain Underpants. All you have to do is snap your fingers to turn Captain Blunderpants back into Nice Krupp.
* WouldHurtAChild: Captain Blunderpants was about to utterly pulverize George and Harold... but then [[spoiler:[[BigDamnHeroes Harold’s grandfather and George’s great-grandmother came to the rescue]]]].

[[/folder]]

[[folder:Kipper, Bugg, Loogie and Finkstein]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/kipper.PNG]]
[[caption-width-right:350:Kipper is the boy on the right with the smug grin and a key for a necklace. Bugg is the boy on the far right with dark hair, Loogie has the baseball cap and Finkstein has bangs covering his face. [[TagLine Remember that now]]]]

A group of bullies who used to torment Harold when he was in kindergarten. They've been able to get away with their despicable crimes since Kipper, the ringleader of the group, is the spoiled nephew of Mr. Krupp.

* AlliterativeName: '''K'''ipper '''K'''rupp.
* BlackBestFriend: Bugg is technically this to the other boys.
* BlindingBangs: The book illustrations show Finkstein with these.
* BringMyBrownPants: Finkstein wets his pants after finding dozens of spiders in his locker, courtesy of George and Harold.
* {{The Bull|y}}ies: They get cheap thrills off of tormenting kindergartners.
* {{Butt Monkey}}s: Kipper & his stooges always fall victim to Kindergarten George & Harold's pranks.
* TheDividual: The four of them are always seen together and don't have many distinct personality traits aside from being sadistic jerks.
* DrivenToMadness: When Tippy Tinkletrousers travels back in time to the exact moment and location of their HeelFaceTurn in the original timeline, they see his time-travel machine (which is shaped like a giant pair of pants). They immediately think they're seeing "The Haunted Pants of Wedgie Magee" in the flesh, and go completely insane.
* DumbJock: Kipper is a jock, but he's an idiot as well.
* DumbMuscle: Clearly more brawn than brain--they beat up kids left and right, but get outwitted by a pair of prank-pulling kindergartners. George notes that Kipper's only weakness is that he's "kinda dumb".
* HeelFaceTurn: After being [[ScareEmStraight scared straight]] by "The Haunted Pants of Wedgie Magee", they return all of the stolen money to the kindergartners they robbed and never bully anyone else for as long as they live.
* HumiliationConga: They get put through a long extended one throughout Book 9 by George and Harold as retribution for bullying the kindergartners.
* {{Jerkass}}: They are assholes, especially to kindergartners.
* JerkJock: Kipper is on the school wrestling team and enjoys beating up kindergartners.
* KarmaHoudiniWarranty: Up until George moved to Piqua, Ohio, they would get away with tormenting kindergartners because Mr. Krupp was not at all suspicious of them. They did, however, [[LaserGuidedKarma fall victim to George & Harold's pranks]].
* MindRape: See DrivenToMadness above.
* NiceHat: Loogie wears a baseball cap.
* ScareEmStraight: George and Harold put them through a series of increasingly brutal pranks to make them think they've been cursed by a ghost called Wedgie Magee as punishment for their bullying.
* ScrewTheRulesIHaveConnections: Kipper and his gang get away with bullying smaller kids out of their lunch money and giving them wedgies because his uncle is Mr. Krupp.
* SmallRoleBigImpact: They only have a significant appearance in Book 9 but their presence is an important factor in George and Harold's lives; they not only become best friends because of the bullies but they also would develop their lifelong careers as comic book creators and professional pranksters.
* StarterVillain: Chronologically, they were the first "villains" defeated by George and Harold. They don't actually appear until Book 9.
* TeensAreMonsters: Preteens, actually. They're sixth graders who take pleasure in bullying younger kids.
* UnmanlySecret: Kipper doesn't actually have one, but George and Harold [[InvokedTrope make it look like he does]] by secretly putting dolls, dresses and a friendship bracelet kit in his locker, getting his friends to laugh at him.
* VillainousGlutton: They intimidate a pizza delivery guy into giving them the pizza that "Wedgie Magee" bought for the kindergartners and [[KickTheDog gleefully eat it all in front of them.]] George and Harold get wise to this and trick them into eating pizza with [[BlazingInfernoHellfireSauce double ghost chili peppers]] on each slice.
* VitriolicBestBuds: Bugg, Loogie and Finkstein find it hilarious when Kipper becomes the target of several pranks by "Wedgie Magee". They stop thinking it's funny when [[MoralMyopia weird things start happening to]] ''[[MoralMyopia them.]]''
* WouldHurtAChild: All four of them are notorious bullies whose favorite targets are kindergartners.

[[/folder]]

[[folder:Edith the Lunch Lady]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/3d22d800_14e6_4de1_a12c_efc79dd71c01.png]]
[[caption-width-right:350:“Oh, Edith... get your head out of the clouds!”]]
-->'''Voiced by:''' Creator/KristenSchaal

A sweet-hearted lunch lady who works at the school. She has a not-so-obvious crush on Mr. Krupp but she's too insecure to express how she feels about him.

* {{Adorkable}}: Acts shy and awkward whenever she's near Mr. Krupp. He more than returns the favor.
* AlienAmongUs: According to director David Soren, [[http://jackie-sugarskull.tumblr.com/post/170987514201/oh-my-god-david-soren-left-this-comment-on-an there was a scene in an early draft of the film]] revealing that she would've been the movie's equivalent to the Alien Lunch Ladies from the third book.
* AllGirlsWantBadBoys: She has a crush on Mr. Krupp, a mean, disagreeable, child-hating principal.
* BigBeautifulWoman: Her body shape is similar to her overweight colleagues and is beautiful both inside and out.
* CanonForeigner: Only appears in TheMovie, replacing the lunch ladies from the third book, who were AdaptedOut.
* CovertPervert: When Mr. Krupp snaps his fingers at the end of the movie to summon a waiter [[ItMakesSenseInContext so they can leave a restaurant being attacked by Talking Toilets]], he turns into Captain Underpants... meaning he rips off all of his clothes. While Edith is shocked at first, her gaze soon turns appreciative.
* HatesMySecretIdentity: {{Averted}}. From the moment we’re introduced to her, it is clear as day that she’s got it ''bad'' for Mr. Krupp, and if the ending of the movie is anything to go by, she [[LovesMyAlterEgo seems to like his other side just as much]].
* LethalChef: Zig-zagged. She does seem fully capable of making something edible, as seen with her casseroles for Mr. Krupp, but her leftover cafeteria food is so toxic it [[BrokeTheRatingScale breaks Poopypants' toxicity counter]].
* NiceGirl: Edith is shy and awkward, but she's a kind lady.
* OneSteveLimit: {{Averted| Trope}}; Edith is also the first name of Ms. Anthrope, although the latter's first name isn't mentioned in TheMovie.
* PeekABangs: One eye is covered as Mr. Krupp points out her blue eye.
* ShrinkingViolet: Especially when she's near Mr. Krupp.
* SignificantBirthDate: According to WordOfGod, it’s February 14th. ''Valentine’s Day''.
* StealthHiBye: She performs the "hi" on a few occasions, startling others.
* ThroughHisStomach: Bless her heart, she tries. She gives Mr. Krupp a tuna casserole with his name spelled on it in jalapeño peppers. Unfortunately, he doesn't know how to properly show his mutual feelings for her.
* TokenGoodTeammate: One of the only ones in the faculty who isn't mean towards any of the kids. That doesn't make her good at her job, though, as she keeps a vat of leftovers in the kitchen that can apparently be used as nuclear superfuel.
[[/folder]]

[[folder:Mr. Ree]]
[[quoteright:186:https://static.tvtropes.org/pmwiki/pub/images/rhee.JPG]]
-->'''Voiced by:''' Creator/ClancyBrown

The school janitor (who [[SuspiciouslySpecificDenial totally doesn’t have a secret past]]) that was [[CanonForeigner introduced in the animated series]].

* AlmightyJanitor
* BadassInDistress[=/=]BrainwashedAndCrazy: [[spoiler: By the Splotch in the latter's second episode.]]
* CanadaEh: He’s French-Canadian.
* ComeWithMeIfYouWantToLive: Basically says this to George and Harold after rescuing them from the T.P. Mummy.
* DarkAndTroubledPast: [[spoiler:He was a part of a government waste disposal program that went horribly wrong, which he blames himself for.]]
* DeadpanSnarker: He isn’t afraid to snark at Mr. Krupp every now and again.
-->'''Mr. Ree:''' (''to Mr. Krupp about the new French teacher, Ms. Yewh'') So, you got a crush on the “Ooh-La-La”?\\
'''Mr. Krupp:''' What? That’s ridiculous! (''proceeds to swoon a little'') [[SuspiciouslySpecificDenial It’s not like I want to take long walks at the movies, trading… butterfly kisses… or-or anything!]]\\
'''Mr. Ree:''' Whatever floats your boat, chief.\\
'''Mr. Krupp:''' My boat floats fine!\\
'''Mr. Ree:''' (''smirking'') …Liar.\\
'''Mr. Krupp:''' WHAT?!\\
'''Mr. Ree:''' Yeah, you heard me.
* PunnyName: His name is a pun on the word “mystery”.
* TraumaButton: [[spoiler: He panics when he starts to think about his past job along with the mention of 'jiggling' the toilet]].

[[folder:Students of Jerome Horwitz Elementary]]
The children that attend the same school as George and Harold who were [[CanonForeigner introduced in the movie and animated series]]. They each have their own quirky personalities that help round out the cast and make school life at Jerome Horwitz more interesting.
!!Erica Wang
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/tumblr_pbzdmzxlpr1u86juso2_400.png]]
[[caption-width-right:200:The 'Strong Female Character' this show deserves]]
--> '''Voiced by:''' Erica Luttrel

A cool and confident girl who is often involved in the adventures of George and Harold. Erica often gives words of wisdom for the boys to follow and is always three steps ahead of everyone on different occasions.
----
* TheAce: Based on Melvin's account, she's one of the top students at Jerome Horwitz and is involved in various clubs along with being president of several of them. Based on George and Harold's account, they think of her as being on a whole different level of cool. They even describe her as Batman [[TakeThat without the angry grumbling]].
* AmbiguousSituation: [[spoiler:In episode 11, she somehow remembers (and keeps an object from) the "Krupp is a CorruptCorporateExecutive" timeline, hinting that there's more to her than we thought.]]
** In the season 2 finale, it's implied that [[spoiler: she knows so much thanks to receiving help from her future self]].
* BadassNormal: As [[spoiler: Plungerina. Even though she lacks Captain Underpants' powers, she can still kick major villain butt]].
* BigGood: [[spoiler: Her future self is revealed to be this since she ends up becoming the President of Earth and manages to achieve world peace 2 years into her presidency. She also tells Melvin that he can guarantee himself a successful future if he makes the effort to change himself for the better]].
* BrutalHonesty: Erica's unafraid to voice her opinions when it comes to George and Harold's antics. She openly tells them that their writing of female characters is offensive and is infuriating the female demographic. She also tells them that they don't have what it takes to get away with suspension like her.
* {{Catchphrase}}: When she isn’t pulling a StealthHiBye, she usually says “I’m out” whenever she leaves.
* CoolBigSis: She fills out this role to the other kids in the BadFuture timeline. She also has these moments when interacting with George and Harold.
* TheCowl: [[spoiler: She takes on the identity ''Plungerina'' to try her hand at superheroics and proves to be very great at it]].
* DarkHorseVictory: [[spoiler:Pulls this in the season 2 finale; George, Harold, and Melvin are so preoccupied with the nanobots and each other that they don't realize that they're not the only students left in the dome, and as a result she steals victory from them at the last moment.]]
* FutureBadass: [[spoiler:Apparently grows up to become the President of Earth and achieve world peace.]]
* [[EvilCounterpart Good Counterpart]]: To Melvin. While Erica is one of the most intelligent kids at Jerome Horwitz who cares about her academic career, she has a good heart and is always looking out for her friends; unlike Melvin who only cares about himself. And while she does make critical remarks towards George and Harold regarding their shenanigans (just like Melvin), it usually comes out of genuine concern and the desire to help them learn from their mistakes (unlike Melvin who only criticizes just for the sake of feeling superior). This even extends to [[spoiler: their future counterparts. Future!Erica had little involvement in the present timeline but helped just enough so that Present!Erica could succeed on her own; Future!Melvin was overbearing towards his present self and made many decisions on his own to ensure that Present!Melvin would enter Elitenati Academy]].
* {{Main/Hammerspace}}: Where is she getting all that ice cream from?
* TheLeader: More often then not she'll lead the student body during times of crisis. In the bad timeline episode, George and Harold state that getting her to help will mean that everyone else will help too.
* MixedAncestry: She's clearly African American but her last name suggests that she has a Chinese parent.
* [[OnlySaneMan Only Sane Girl]]: Out of the rest of the cast, she’s the most level-headed.
* ThePerfectionist: An amicable example. She's responsible with her academics and wouldn't do anything dangerous or stupid to jeopardize her current standing. She even admits that she intends to be a senator when she grows up.
* TheSmartGirl: She's hyper intelligent and knows more about a given situation then the others. Lampshaded when the boys hire her to be the ''Thinks'' for M.I.S.F.A.R.T.S.
* StealthHiBye: She has a habit of popping in and out of scenes much to the confusion of the boys.
* {{Main/Tritagonist}}: Arguably the most prominent character in the series after the boys and Krupp/CU as she often plays a role in their adventures and [[spoiler: is implied to be more than what she appears to be]].
* {{Main/Troll}}: She likes to pull pranks on the boys, especially in episodes 4 and 9, claiming that the best way to make a prank is to 'prank a prankster'. [[spoiler: She even admits in episode 9 that she was never suspended at all and just wanted to mess with them]].
* UnwittingInstigatorOfDoom: She was the one who [[spoiler:suggested to George and Harold that they go to Superintendent Vil Endenemys to try to get Mr. Krupp fired before he can expel them, not knowing that Vil Endenemys is actually Melvin Sneedly’s future self, who not only fires Krupp, but expels George and Harold and then takes over the school with Melvin]].
* WomenAreWiser: She's one of the more level headed girls on the show and the boys often go to her for help during their misadventures.

!!Jessica Gordon and the Sophies
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/cap_pd101_01063605_rgb.JPG]]
[[caption-width-right:350:Left to Right (Other Sophie, Jessica, Sophie 1)]]
--> '''Voiced by:''' Dayci Brookshire

The popular girls of the school. Jessica and her crew often engage in their own girly affairs but will more often then not become involved in the wild antics of the show.
----
* AscendedExtra: Jessica has more speaking lines in Season 2.
* BeehiveHairdo: It’s bigger than ''her entire body''!
* TheChick: She and the other Sophies fill this role when they join M.I.S.F.A.R.T.S.
* GirlPosse: Jessica is always shown in the company of Sophie 1 and Other Sophie.
* HeroOfAnotherStory: In episode 10, after getting amnesia from the memory wipes, she and her crew become involved in [[spoiler: protecting the whales. They end up ditching school to protect them from whale hunters and even get to ride with them in the end]].
* ImprobableHairStyle: There's no way she can get her hair to be that big everyday and walk around like it's no big deal.
* ItIsPronouncedTroPAY: She pronounces “hair” as ''haar''.
* TheLeader: She takes on this role when the school is attacked by an angry swarm of Butt-erflies.
* LovableAlphaBitch: She has her mean girl moments, especially towards [[ButtMonkey Other Sophie]], but she's still very likable.
* MonsterOfTheWeek: Thanks to [[{{Main/Jerkass}} Melvin]] using her as a test subject for his new ray gun, Jessica turns into ''Messica Gorgon'' the [[OurVampiresAreDifferent Vimpire]].
* PinkMeansFeminine: Befitting her archetype, her main color is hot pink.
* RaceLift: In the book series she was white. Here, she's African American.
* RapunzelHair: [[CaptainObvious Try to guess]].
* [[SatelliteCharacter Satellite Characters]]: The Sophies only exist to serve as Jessica's clique. They haven't even spoken a single word in their appearances.
* ValleyGirl: Speaks in this tone of voice.

!! Steve "Gooch" Yamaguchi
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/tumblr_pbze2mmqgy1u86juso4_250.png]]
--> '''Voiced by:''' Evan Kishiyama

An adorable boy [[ButtMonkey who attracts misfortune to himself]] and is a good friend of the boys.
----
* {{Main/Adorkable}}: He definitely has these moments.
* AnimalsHateHim: Season 2 often features the poor boy in the jaws of a vicious animal.
* AsianAndNerdy: Played with. He's of Japanese descent and pretty dorky, but he defies the stereotype since studying isn't his strength or something he enjoys.
* ButtMonkey: The most likely to suffer some sort of physical abuse in an episode.
* GadgeteerGenius: Subverted. The boys give him the role as tech genius for M.I.S.F.A.R.T.S. by process of elimination. And Gooch makes it constantly clear that he has no tech skills to save himself or anyone for that matter.
* HeroOfAnotherStory: Gooch is shown to be involved in some peculiar situations while the boys are in the middle of their adventures.
* HiddenDepths: He knows how to play the organ along with the pan flute.
* InSeriesNickname: His real name is Steve but everyone calls him ''Gooch''.
* InTouchWithHisFeminineSide: He wears a pink collared shirt and isn't afraid to cry or express how he's feeling.
* {{Main/Keet}}: He's a very cheerful child.
* SuspiciouslySimilarSubstitute: Appearance-wise, Gooch bears alot of similarities to [[spoiler: Billy Doanbee-Ahiro, Harold's future husband]] if he were a child.
* WhatTheHellHero: He calls out the boys for going too far in representing Erica as a monster vampire for their comics.

!!Dressy Killman
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/tumblr_pegnah32mb1v5r6c4o3_250.png]]
--> '''Voiced by:''' Dayci Brookshire

A mellow and cheerful young girl who could very well pass for a hippie and is another friend of the boys.
----
* CharacterTic: She has a habit of singing out the last word of a sentence she's speaking.
* DidYouJustFlipOffCthulhu: She threw a dodgeball directly at Krupp's face to keep him from taking her comic book and faced no consequences for it.
* NeatFreak: [[WordOfGod According to the official guidebook]], she despises pranks, mischief, and messes.
* NewAgeRetroHippie: Her outfit, and the music she plays when auditioning as DJ for the school dance in episode 2, makes her come off as this.
* QuirkyCurls: Her orange hair is long and fluffy to portray her free spirit.
* WickedCultured: In episode 2 of Season 2, Dressy shows alot of knowledge when it comes to Ecuador since she and her parents often travel.
* YouthfulFreckles: She sports some on her face.

!!Bo Hweemuth
[[quoteright:234:https://static.tvtropes.org/pmwiki/pub/images/babyboy.JPG]]
[[caption-width-right:234:Baby boy. Baby.]]
--> '''Voiced by:''' Brennan Murray

A talented, good-hearted sculptor who wishes to have friends. He was initially alone because of all the rumors that painted him as a powerful but dangerous legend which made everyone afraid of him.
----
* AscendedFanboy: He's a huge fan of Captain Underpants and was flattered when George and Harold made him the villain in their comic book. [[spoiler: By the end of the episode, he now works with the boys in making Captain Underpants toys for the student body]].
* TheBigGuy: Because of Bo's large size, he's given the role of ''Bigs'' for the M.I.S.F.A.R.T.S.
* BlindingBangs: We don't know what his eyes look like thanks to these.
* FaceOfAThug: His gruff appearance makes him come off as a bully figure.
* FriendToAllLivingThings: At one point, Dressy tells George and Harold that she saw him save a ladybug from a spider’s web.
* GentleGiant: He’s quite a bit bigger than most of his classmates, but is a soft-hearted soul who wouldn't hurt a fly.
* HiddenDepths: Along with being a gifted sculptor, he knows how to play the banjo. It’s also hinted that he has some mechanical knowledge, as he helped Gooch fix a bicycle.
* IJustWantToHaveFriends: He earnestly wishes for this and is touched when George and Harold still want to be friends with him even after his rampage as ''Claylossus''. [[spoiler: They even have him involved in Treehouse Comix Inc. by making him the head of toy development]].
* MisunderstoodLonerWithAHeartOfGold: Before befriending George and Harold, he spent most of his time in the school’s abandoned ceramics studio, and there were enough rumors about him to make a whole horror movie franchise, but he’s really just a big sweetie.
* MonsterOfTheWeek: Was turned into the clay monster ''Claylossus'' against his will, courtesy of [[{{Main/Jerkass}} Melvin]].
* NiceHat: He wears an orange toque for a hat.
* PunnyName: His name is a play on the word “behemoth”.
* UnwittingPawn: Mr. Krupp uses Bo's reputation as an unworldy bully in order to terrorize the other kids into submission as “scared children are good children”.

!!Stanley Peets
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/download_132.jpg]]
--> '''Voiced by:''' Jorge Diaz

A sweaty farm boy who is known for having plants growing out of his armpits.
----
* BodyHorror: Stanley has avocado plants growing out of his armpits. Apparently it's a common trait among his family.
* DeepSouth: He has a thick Southern accent.
* DemotedToExtra: He hardly has a presence in Season 2. The most he gets is a silent cameo in a single episode.
* FarmBoy: He and his family run a successful farm that specializes in bountiful produce.
* YouGottaHaveBlueHair: His hair is dark green, and it’s as soaked in sweat as the rest of him.

!!Tommy
[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/tumblr_ow0uq3ohua1u86juso5_250.png]]
--> '''Voiced by:''' David Soren

A boy who is seen frequently throughout the movie hiding in his own locker.
----
* CanonForeigner: He's the only named minor student from the movie.
* TheEeyore: He's depressed for a majority of the movie.
* RunningGag: Throughout the movie, he locks himself in his locker to wallow in despair.
* SmallRoleBigImpact: Tommy's existence is to remind George and Harold, and the viewers, as to what can happen to the children of Jerome Horwitz who succumb to Krupp's totalitarian rule.
* [[WhenSheSmiles When He Smiles]]: He gives a very heartwarming smile when the atmosphere of the school changes for the better.
* YouthfulFreckles: Has some across his face.

[[/folder]]

[[folder:Ms. Tara Ribble]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/ribble.JPG]]
[[caption-width-right:350:From Left to Right (Movie, Book/Wedgie Woman, Cartoon)]]
-->'''Voiced by:''' Dee Dee Rescher (movie), Laraine Newman (animated series)

George and Harold's homeroom teacher as well as the Wicked Wedgie Woman in Book 5. She, like many of the faculty members, enjoys being cruel to her students by having them complete long and difficult assignments that meet her standards.

* ADayInTheLimelight: Gets one in book 5.
* BaldWoman: This happens to her twice. First in book 5 and again in book 12 (she did have a mohawk, but still).
* BeeAfraid: In the animated series; her stint as a MonsterOfTheWeek involves turning into the queen of a horde of [[{{Pun}} "zom-bees"]] consisting of mutated students and staff.
* BeehiveHairdo: Carries this in the books, the movie, and the animated series.
* BorrowedCatchphrase: She called Mr. Krupp "bub" in one book.
* ButtMonkey: She's this in George & Harold's comic book. She also falls victim to George & Harold's pranks (once in the movie) and even loses her hair twice.
* ChildHater: Like every other teacher at Jerome Horwitz, she hates her students. Book 5 shows that she has a framed certificate in her house for winning the "Meanest Teacher of the Year Award".
* DemotedToExtra: In the movie.
* DisproportionateRetribution: After George and Harold unintentionally trick Mr. Krupp into marrying her in Book 5, she deliberately changes all their grades to Fs and Gs so they'll flunk fourth grade.
* DistaffCounterpart: Is practically a female Mr. Krupp in design. It's lampshaded in book 5 when she makes fun of Krupp's stubby, pig-like nose ([[HypocriticalHumor which she also has]]). Also, Mr. Krupp became the superhero Captain Underpants as a result of hypnosis GoneHorriblyRight, while Ms. Ribble became the supervillainess Wedgie Woman due to hypnosis GoneHorriblyWrong.
* FMinusMinus: As explained above, in Book 5 she changes the boys’ grades to Fs and ''Gs'' after the marriage proposal prank so they’ll flunk fourth grade. Then in episode 3 of the animated series she gives the boys’ essays the grade of H for “Horrendous”.
* FatBitch: She is as chubby as Mr. Krupp and she is very unfair to the students.
* FriendToAllChildren: Post-HeelFaceTurn, she turns into a kind teacher who bakes chocolate chip cookies for her students every day. This is until Book 12 at least, when she goes back to her old ways.
* HeelFaceBrainwashing: After the events of the fifth book, Harold and George brainwash Ms. Ribble into becoming the sweetest teacher at Horwitz elementary, but she seems to go back to her old ways in the final book.
* HypnoFool: George and Harold ''try'' to hypnotize her into changing their grades back, [[TemptingFate and to not do anything crazy like turn into Wedgie Woman]]. Given that the Hypno-Ring was revealed to have opposite effects on women immediately beforehand, this goes about as well as you'd expect.
* HypocriticalHumor: She calls Mr. Krupp's nose stupid even though her nose looks exactly like his.
* IconicItem: In all three incarnations, she's always shown with her pointy glasses and pearl necklace.
* {{Jerkass}}: At least until her HeelFaceBrainwashing. But during the final book she turns evil again for no given reason.
* NeverMyFault: While it was immature & wrong for George & Harold to trick her & Mr. Krupp into (almost) getting married, Ms. Ribble decides to put the whole blame on the boys for the wedding & changes their grades to failing grades to get them to flunk the fourth grade. She ignores the fact that she and Mr. Krupp had a whole week to simply tell the other staff members that neither of them wanted to get married to each other and that they were a victim of a prank. It doesn't help that the prank George & Harold did was intended to be a small prank that people will just laugh at & then move on.
* PowerMakesYourHairGrow: And become prehensile, when she's Wedgie Woman.
* PunnyName: Ms. Ribble is a pun on "Miserable" while her full name Tara Ribble is pun on "Terrible".
* RecurringBoss: She's been the MonsterOfTheWeek more times out of all the faculty members. She was the main head for the ''Homework Hydra'', the Queen of the [[BeeAfraid Zombees]], and the Wicked Wedgie Woman if you count the book series.
* SadistTeacher: Prior to the events of book 5. Her animated counterpart also counts but her sadism is not as high as her book self.
** Subverted in the movie. She's just apathetic and uncaring about the information she's teaching to her students.
* SuperpoweredEvilSide: Make that Superpowered Evil''er'' Side, when she gains the Wedgie Woman persona in book 5. Granted, she didn't initially have super powers, but after getting a load of [[PowerUpFood Super-Power Juice]] dumped in her hair...
* TookALevelInJerkass: In the final book, she goes back to being just as evil as the other teachers for some unexplained reason.
* TookALevelInKindness: Thanks to some [[HypnoFool reverse hypnotism]], George and Harold alter her into a kind teacher who loves to have fun with her students.
* TrademarkFavoriteFood: Her favorite flavor of ice cream is chunky tofu, which she forces the students to eat at her retirement party.
* WomanChild: After her HeelFaceTurn, she has tendencies of this. An example is in book 6 when she joins the kids in pulling "squishies" prank on the other staff members.
** Before she was brainwashed, she even joins the teachers into bullying children, especially George & Harold.
* WouldHurtAChild: She was all too willing to harm George & Harold in book 5 when they unintentionally tricked her and Mr. Krupp into marrying each other.
-->'''Ms. Ribble:''' ''I'M GONNA GRIND THOSE KIDS INTO HEAD CHEESE!!!''
* YouGottaHaveBlueHair: As Wedgie Woman, she gets bright blue hair.
** In the animated series, her hair is teal-grey.

[[folder:Mr. Kenny B. Meaner]]
[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/mr_meaner_the_epic_tales_of_captain_underpants_151.jpg]]
[[caption-width-right:210:"Yeah-yeah-yeah-yeah"]]
-->'''Voiced by:''' David Koechner

The main gym teacher of Jerome Horwitz. Despite being as bright as a sack of bricks, he torments his students by making gym a living hell for them.

* ADayInTheLimelight: He's the villain of the 12th book.
* AssholeVictim: In the comics that George and Harold write.
* BigBad: Of Book 12.
* BlobMonster: As Sir Stinks-a-Lot, a giant blob of energy.
* BookDumb: Academics aren't his forte. His alter ego ''Sergeant Boxers'' is even worse since he admits that he can't read.
* ButtMonkey: He's always this in the comics that George and Harold write, where he's the "Gym teacher" who's the victim of the latest villain, only for the principal to not care.
* ChekhovsGunman: Mr. Meaner has been around from the very beginning of the series, but never really did anything significant aside from [[ItMakesSenseInContext getting eaten by a toilet]] in the second book. That is, until Book 12 came along.
* EmbarrassingFirstName: According to WordOfGod, his name is Kenny.
* FatBastard: Overweight? Check. SadistTeacher? Check. He's second only to Mr. Krupp in both departments.
* GymClassHell: His gym class is very difficult.
* HiddenDepths In episode 3 of Season 1, he admits that he was interested in becoming a surgeon but couldn't apply since he never finished high school and used to be a non-U.S. resident.
* {{Hypocrite}}: He is overweight yet he picks on students for not performing well nor being fit in his classes.
* JerkJock: He's a gym teacher who mistreats the kids.
* KarmaHoudini: Despite [[spoiler: capturing the Chupabacra's lover]], Meaner gets away scot-free after [[spoiler: she finds a new partner in Poopacabra]].
* MyGrandmaCanDoBetterThanYou: Heck, his comic depiction pretty much quotes the trope name verbatim at one point.
* OneWingedAngel: Near the end of Book 12, he turns into the titular Sir Stinks-A-Lot after eating an egg-salad and dill-pickle relish sandwich that supercharges the minerals that boosted his intelligence in the first place.
* PunnyName: "Misdemeanour". And his full name is a pun of "can he be meaner".
* SadistTeacher: Picks on the out of shape kids.
* StarterVillain: In the cartoon, he's the first villain the boys face under the alter ego ''Flabby Flabulous'', which is ironic considering that he's the FinalBoss in the book series.
* SuperIntelligence: In Book 12, he becomes a supergenius after eating a chunk of what used to be Smart Earth.
* SuperPowersForADay: With Captain Underpants unavailable to help them in the Season 2 premiere, George and Harold hypnotize Meaner by turning him into ''Sergeant Boxers'', a meatheaded athlete hero who is able to take on an army of Teachertrons without breaking a sweat.
* VerbalTic: Has one in the animated series. Tends to go “Yea-Yea-Yea-Yea” in a stutter-like fashion frequently.
* WhyDidItHaveToBeSnakes: In episode 7 of the animated series, it’s revealed that he’s terrified of {{Chupacabra}}. It's revealed in Season 2 that [[spoiler: Meaner ended up capturing Chupacabra's lover while on vacation and had him taken to the authorities. [[WomanScorned She's been after his tail for vengeance ever since]]]].

[[folder:Ms. Edith Anthrope]]
[[quoteright:310:https://static.tvtropes.org/pmwiki/pub/images/anthrope.JPG]]
[[caption-width-right:310:"Did you call me?"]]
-->'''Voiced by:''' Patty Mattson

The school secretary. She often gives Mr. Krupp a hard time with just about anything.

* CreepyMonotone: Her tone of voice in the animated series.
* DeadpanSnarker: In the books, she loves to snark at Mr. Krupp. She also has a few moments in the animated series, with a lot more emphasis on the “deadpan” part.
* {{Jerkass}}: Like the other staff members, she is mean to students.
** In the books only. In the movie and animated series, she’s honestly just indifferent to everything around her.
* MonsterOfTheWeek: In Season 2, the boys accidentally turn her into ''Clogneta'', a powerful, ego-maniacal villain who can control all forms of clogs and sewage.
* PetTheDog: It was rather generous of her to take care of the preparations for Mr. Krupp and Ms. Ribble's "wedding" in Book 5. Even if it backfired spectacularly.
** In the animated show, she wanted to bring balloons and colors to make the school dance more enjoyable.
* PunnyName: Ms. Anthrope is a pun on "misanthrope", while her full name, Edith Anthrope, is a pun on "eat it and throw up".
* RaceLift: In the movie and the animated series, she's African American.
* RunningGag: In the animated series, she has a habit of walking into a room where Krupp is having a moment asking if 'he called her'. Following Krupp being frustrated by her appearance along with a {{Main/Beat}}, she says something off topic or random.
* SassySecretary: She does not put up with Mr. Krupp’s crap at all.
-->'''Mr. Krupp:''' Where's my coffee, Edith?\\
'''Ms. Anthrope:''' Get it yourself, tubby!\\
'''Mr. Krupp:''' I don't need your lip today, woman! I just want my coffee and I want it NOW!\\
'''Ms. Anthrope:''' Well, get me a cup, too, while you're at it.
* ShipTease: With Captain Underpants. After he saves her in book 6, she kisses him several times, gives him a hug, and wishes him good luck.
-->'''Ms. Anthrope:''' (''coyly'') Now go get him, tiger.
* ShipperOnDeck: In book 5, she seems way too eager to plan Mr. Krupp and Ms. Ribble's wedding.

[[folder:Mr. Morty Fyde]]
[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/mr_fyde_the_epic_tales_of_captain_underpants_158.jpg]]
[[caption-width-right:210: [[{{Series/TheIncredibleHulk}} You wouldn't like him when he's angry.]]]]
-->'''Voiced by:''' Mel Rodriguez (movie), Stephen Root (animated series)

The main science teacher of the school. A timid and fragile man who often has the worst of luck.

* AmbiguouslyBrown: His animated counterparts have a darker skin complexion compared to the books.
* AndThenJohnWasAZombie: [[spoiler: He turns into an avocado tree at the end of his episode]].
* BerserkButton: He loses his composure when it comes to loud noises.
* ButtMonkey: In all three incarnations, he suffers some form of misfortune.
** In the books, the chaotic events from books 1-3 are too much for Mr. Fyde's mental health that he decides to quit and goes to live at "Piqua's Home for the Reality Challenged".
** In the movie, Mr. Krupp fires him after he requests to take a Saturday off to spend time with his family.
** In the animated series, even though he came back from Piqua's mental ward, he still hasn't adjusted to loud noises and is very fragile. And he turns into ''Avocadwoe''.
* MonsterOfTheWeek: Using Melvin's machine, the boys accidentally turn him into ''Avocadwoe''; a giant avocado monster who intends to destroy all noises no matter the cost.
* PunnyName: Mr. Fyde is a pun for "mystified" while his full name, Morty Fyde, is a pun for "mortified".
* PutOnABus: In all three versions, he leaves his job as a teacher at Jerome Horwitz for the reasons listed above and below.
* RaceLift: He has a dark skin tone in the animated incarnations.
* ThrowTheDogABone: [[spoiler: Even though he is now a tree, Mr. Fyde is perfectly content since he was planted in a calm and tranquil forest]].

[[folder:Professor Pippy P. Poopypants/Tippy Tinkletrousers]]
[[quoteright:206:https://static.tvtropes.org/pmwiki/pub/images/latest__3_jpg.png]]
[[caption-width-right:206:[[BerserkButton Don't make fun of]] [[SchmuckBait his name.]]]]
-->'''Voiced by:''' Nick Kroll

A brilliant scientist from New Swissland who turned to villainy after being made fun of because of his ridiculous name one too many times by the world and children of all ages. He is a recurring villain that the boys and Captain Underpants have to face on various occasions.

* AdaptationNameChange: Renamed "Pee Pee Diarrheastein Poopypants Esquire" in the movie, which, props to the creators of the film for taking a name like "Professor Poopypants," and somehow making it ''so much worse.''
* AdaptationalVillainy: In the movie, he isn't [[SanitySlippage driven to craziness]] from George and Harold's tricks, he is already a villain to begin with. His backstory reveals he'd already snapped when [[spoiler:the presenters at the Nobel prize ceremony were too busy laughing at his name to give him his well-deserved award]].
* AffablyEvil: In the movie, he's quite cheery as far as mad scientists go, even if he wants to wipe laughter off the face of the planet. Until you make fun of his name...
* AlasPoorVillain: Sympathy for him may vary since he does lose sight of his goal (as well as his sanity) as the books go on. But when it all comes down to it, he was a legitimately brilliant man with actual qualifications. Heck, he designed a shrink ray and a growth ray to get rid of the world's garbage problems (by shrinking it to nothingness) and ''solve world hunger'' (by making all the food super-sized). All he originally wanted was to teach people about science, only for them to not give two shits because he had a funny sounding name. Even George and Harold themselves had to admit that his villain origins could have been avoided if they didn't make fun of him.
* AlliterativeName: Pippy Pee Pee Poopypants, and later Tippy Tinkletrousers.
* AsLongAsItSoundsForeign: Hails from the country of New Swissland, where everybody has ridiculous names.
* BagOfHolding: His briefcase in TheMovie.
* BeenThereShapedHistory: His meddling with time was what inadvertently wiped out the dinosaurs, caused the Ice Age, and creates the Big Bang that stated the universe.
* BerserkButton: He doesn't take people making fun of his name very well, as the whole of Jerome Horvitz learned the hard way. In the movie, the woman presenting Nobel Prizes learned this ''much'' earlier.
** In the movie, he doesn't like children laughing to the point that it becomes part of his EvilPlan to stop kids from laughing forever.
* BigBad: Of Book 4, 9, and 10 and in TheMovie.
* ButtMonkey: Constantly made fun of in his debut. He's also a ButtMonkey in the movie.
* CardCarryingVillain: He doesn't even ''try'' to be subtle in the movie. [[HorribleJudgeOfCharacter Captain Underpants has a good feeling about him anyway.]]
* ChronicBackstabbingDisorder: During his reappearance, he abuses time-travel twice to solve his problems, creating "clones" of himself. All three clones betray the others at the first opportunity. When Harold and George are arguing about how to get home, one of them points out that they can't trust him, since '''he can't trust ''himself'''''.
* ComicallyMissingThePoint: At the end of Book 4, he decides to take George and Harold's advice to change his name so people won't laugh at him anymore. He decides to rename himself "Tippy Tinkletrousers".
* TheComicallySerious: He wants to be taken seriously by the scientific community, but it's not exactly easy with a name like "Pippy P. Poopypants". It really doesn't help that he doesn't ''realize'' it's an {{Unfortunate Name|s}}, since everyone in his country has a silly name.
* TheCynic: In the movie. He claims that a student's dream of world peace is "unattainable", and scoffs at Melvin's claim that "real power comes from within".
* DeadpanSnarker: The movie gives him a few snarky moments when he's not ChewingTheScenery like it's going out of style.
--> "Oh, look at this. We've got a grade-A suck-up. Good to know, good to know."
* EinsteinHair: He has poofy hair that matches his MadScientist look.
* EvilIsHammy: See LargeHam.
* FreudianExcuse: People laughing at his name all the time led him to villainy.
* GenreBlindness: In the books, he took up a position as a teacher at an elementary school, believing that children were sweet and innocent and wouldn't laugh at his name. He was wrong. ''So very, very wrong.''
* HerrDoktor: The movie gives him a heavy German accent.
* {{Hypocrite}}: He wants to rid the world of laughter, yet he frequently indulges in [[EvilLaugh evil laughter]], and even has a film of bloopers that he finds amusing.
* AnIcePerson: He created a freeze ray in Book 8.
* ImpossibleGenius: Has mastered sizechanging technology and time travel.
* InsufferableGenius: He's pretty egotistical about his inventions.
* KarmicDeath: [[spoiler: For attempting to blow up the planet, Tippy gets killed off permanently]].
* KilledOffForReal: [[spoiler:In book 9, three separate times at that.]]
* LargeHam: Voiced by Nick Kroll, and it shows.
* MadScientist: He likes to invent, but he's not so mad until his SanitySlippage.
** Played straight in TheMovie at his insistence:
-->'''George:''' (''reading his resume'') It says here that you were a "genius inventor"?
-->'''Poopypants:''' (''slamming a mace down into the desk'') '''''Mad''''' genius inventor!
* MakeMyMonsterGrow: His Goosy-Grow 4000 can make things bigger, including his MiniMecha which he turns into a HumongousMecha.
* MeaningfulRename: After attempting to give everyone in the world silly names, Professor Poopypants is advised by George and Harold to change his own name instead. Calling himself Tippy Tinkletrousers did not improve his situation.
* NiceJobFixingItVillain: When he goes back in time, he accidentally prevents Captain Underpants from ever existing, resulting in a BadFuture where all of the threats that Captain Underpants had stopped are now in play. He realizes his mistake and goes to fix it.
** In the movie, [[spoiler:He does this ''twice in a row''. The first time was when he had the Turbo Toilet 2000 "eat" Captain Underpants. In doing so, he exposed CU to the pretty much radioactive leftovers from the school cafeteria, and it ultimately results in him getting ''real'' superpowers. The second time is when he's seemingly won after erasing George and Harold's sense of humor. He mentions the planet Uranus, which triggers the memory of how George and Harold first met, and gets them laughing again, which destroys the Anti-Humor machine and undoes its effects on the rest of the school]].
* OmnicidalManiac: Attempted to [[spoiler: destroy the planet in book 10]].
* OverarchingVillain: The most recurring villain of the books.
* RecurringBoss: He's the one villain who keeps coming back over and over.
* SanitySlippage: From well-meaning, brilliant scientist hoping to solve all the problems in the world or at least to teach young children the joy of science, to a crazy person hoping to give everyone in the world a name as silly as his, [[spoiler: to a balls-out lunatic willing to do anything necessary to kill Harold and George, to an OmnicidalManiac]]. Whoa! This is even more prominent in the movie, where [[spoiler: he wants to eliminate all humor so no one will ever laugh at his name.]]
* ShrinkRay: His Shrinky-Pig 2000.
* SignificantBirthDate: Of the ironic variety in the movie. Thanks to a FreezeFrameBonus, you see on his resumé that he was born on ''AprilFoolsDay'', of all days!
* ShutUpKirk: In the movie, when George and Harold try to talk him down.
-->'''George:''' Your problem isn't that people laugh at you, but that you can't laugh at yourself.\\
'''Poopypants:''' Oh, really, [[Series/TheOprahWinfreyShow Oprah]]? Is that my problem?!
* StatingTheSimpleSolution: It takes two fourth graders to point out that it ''might'' have been easier to just change his name instead of holding the world hostage with shrink rays and HumongousMecha. He claims he never even thought of that.
* ThenLetMeBeEvil: George and Harold write a comic book about him trying to take over the world, and he finds a copy of it, suffers a psychotic break after reading it, and decides to actually take over the world. [[NiceJobBreakingItHero Nice job breaking it, George and Harold!]]
** In the movie:
-->'''Poopypants:''' So George and Harold want a super villain, huh? Well ask and he shall ''RECEIVE''!!
** In the movie, he even changes his outfit to match the one that George and Harold made for the comics.
* UnfortunateNames: Just read it. The new name he gives himself (Tippy Tinkletrousers) is only slightly less embarrassing.
** In the movie, it's [[AdaptationNameChange changed]] to Pee Pee Diarrheastein Poopypants Esquire, which is ''even worse.''
* VillainProtagonist: Of Book 9.
* WouldHurtAChild: He was all too willing to hurt George & Harold in book 4, 9, and 10.

[[folder:Evil George, Evil Harold, and Captain Blunderpants]]
[[quoteright:185:https://static.tvtropes.org/pmwiki/pub/images/nice_krupp_is_now_the_mean_captain_blunderpants.png]]
[[caption-width-right:185:[[{{Film/Us}} "We are our own worst enemy."]]]]

The Purple Potty counterparts of our heroes. Rotten to the core, they enjoy using their supervillain creation to do whatever sinister schemes they want.

* EvilCounterpart: Evil George and Harold are mean-spirited and wicked children who make their own comic books. However, they are actually more talented than their good counterparts, creating much better drawn comics with proper spelling and grammar. Inverted with Mr. Krupp, who is a nice principal with a good sense of humor.
* EvilTwin: That pretty much goes without saying.
* KarmaHoudini: [[spoiler: Even after being defeated by the Arthritic Avengers and being sent back to their universe, it's more than likely that they'll go back to terrorizing their world with Captain Blunderpants. They even manage to get their good counterparts arrested for the crimes they committed in the main universe]].
* WeaksauceWeakness: Probably even moreso than Captain Underpants. All you have to do is snap your fingers to turn Captain Blunderpants back into Nice Krupp.
* WouldHurtAChild: Captain Blunderpants was about to utterly pulverize George and Harold... but then [[spoiler:[[BigDamnHeroes Harold’s grandfather and George’s great-grandmother came to the rescue]]]].

[[/folder]]

[[folder:Kipper, Bugg, Loogie and Finkstein]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/kipper.PNG]]
[[caption-width-right:350:Kipper is the boy on the right with the smug grin and a key for a necklace. Bugg is the boy on the far right with dark hair, Loogie has the baseball cap and Finkstein has bangs covering his face. [[TagLine Remember that now]]]]

A group of bullies who used to torment Harold when he was in kindergarten. They've been able to get away with their despicable crimes since Kipper, the ringleader of the group, is the spoiled nephew of Mr. Krupp.

* AlliterativeName: '''K'''ipper '''K'''rupp.
* BlackBestFriend: Bugg is technically this to the other boys.
* BlindingBangs: The book illustrations show Finkstein with these.
* BringMyBrownPants: Finkstein wets his pants after finding dozens of spiders in his locker, courtesy of George and Harold.
* {{The Bull|y}}ies: They get cheap thrills off of tormenting kindergartners.
* {{Butt Monkey}}s: Kipper & his stooges always fall victim to Kindergarten George & Harold's pranks.
* TheDividual: The four of them are always seen together and don't have many distinct personality traits aside from being sadistic jerks.
* DrivenToMadness: When Tippy Tinkletrousers travels back in time to the exact moment and location of their HeelFaceTurn in the original timeline, they see his time-travel machine (which is shaped like a giant pair of pants). They immediately think they're seeing "The Haunted Pants of Wedgie Magee" in the flesh, and go completely insane.
* DumbJock: Kipper is a jock, but he's an idiot as well.
* DumbMuscle: Clearly more brawn than brain--they beat up kids left and right, but get outwitted by a pair of prank-pulling kindergartners. George notes that Kipper's only weakness is that he's "kinda dumb".
* HeelFaceTurn: After being [[ScareEmStraight scared straight]] by "The Haunted Pants of Wedgie Magee", they return all of the stolen money to the kindergartners they robbed and never bully anyone else for as long as they live.
* HumiliationConga: They get put through a long extended one throughout Book 9 by George and Harold as retribution for bullying the kindergartners.
* {{Jerkass}}: They are assholes, especially to kindergartners.
* JerkJock: Kipper is on the school wrestling team and enjoys beating up kindergartners.
* KarmaHoudiniWarranty: Up until George moved to Piqua, Ohio, they would get away with tormenting kindergartners because Mr. Krupp was not at all suspicious of them. They did, however, [[LaserGuidedKarma fall victim to George & Harold's pranks]].
* MindRape: See DrivenToMadness above.
* NiceHat: Loogie wears a baseball cap.
* ScareEmStraight: George and Harold put them through a series of increasingly brutal pranks to make them think they've been cursed by a ghost called Wedgie Magee as punishment for their bullying.
* ScrewTheRulesIHaveConnections: Kipper and his gang get away with bullying smaller kids out of their lunch money and giving them wedgies because his uncle is Mr. Krupp.
* SmallRoleBigImpact: They only have a significant appearance in Book 9 but their presence is an important factor in George and Harold's lives; they not only become best friends because of the bullies but they also would develop their lifelong careers as comic book creators and professional pranksters.
* StarterVillain: Chronologically, they were the first "villains" defeated by George and Harold. They don't actually appear until Book 9.
* TeensAreMonsters: Preteens, actually. They're sixth graders who take pleasure in bullying younger kids.
* UnmanlySecret: Kipper doesn't actually have one, but George and Harold [[InvokedTrope make it look like he does]] by secretly putting dolls, dresses and a friendship bracelet kit in his locker, getting his friends to laugh at him.
* VillainousGlutton: They intimidate a pizza delivery guy into giving them the pizza that "Wedgie Magee" bought for the kindergartners and [[KickTheDog gleefully eat it all in front of them.]] George and Harold get wise to this and trick them into eating pizza with [[BlazingInfernoHellfireSauce double ghost chili peppers]] on each slice.
* VitriolicBestBuds: Bugg, Loogie and Finkstein find it hilarious when Kipper becomes the target of several pranks by "Wedgie Magee". They stop thinking it's funny when [[MoralMyopia weird things start happening to]] ''[[MoralMyopia them.]]''
* WouldHurtAChild: All four of them are notorious bullies whose favorite targets are kindergartners.

[[/folder]]

[[folder:Edith the Lunch Lady]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/3d22d800_14e6_4de1_a12c_efc79dd71c01.png]]
[[caption-width-right:350:“Oh, Edith... get your head out of the clouds!”]]
-->'''Voiced by:''' Creator/KristenSchaal

A sweet-hearted lunch lady who works at the school. She has a not-so-obvious crush on Mr. Krupp but she's too insecure to express how she feels about him.

* {{Adorkable}}: Acts shy and awkward whenever she's near Mr. Krupp. He more than returns the favor.
* AlienAmongUs: According to director David Soren, [[http://jackie-sugarskull.tumblr.com/post/170987514201/oh-my-god-david-soren-left-this-comment-on-an there was a scene in an early draft of the film]] revealing that she would've been the movie's equivalent to the Alien Lunch Ladies from the third book.
* AllGirlsWantBadBoys: She has a crush on Mr. Krupp, a mean, disagreeable, child-hating principal.
* BigBeautifulWoman: Her body shape is similar to her overweight colleagues and is beautiful both inside and out.
* CanonForeigner: Only appears in TheMovie, replacing the lunch ladies from the third book, who were AdaptedOut.
* CovertPervert: When Mr. Krupp snaps his fingers at the end of the movie to summon a waiter [[ItMakesSenseInContext so they can leave a restaurant being attacked by Talking Toilets]], he turns into Captain Underpants... meaning he rips off all of his clothes. While Edith is shocked at first, her gaze soon turns appreciative.
* HatesMySecretIdentity: {{Averted}}. From the moment we’re introduced to her, it is clear as day that she’s got it ''bad'' for Mr. Krupp, and if the ending of the movie is anything to go by, she [[LovesMyAlterEgo seems to like his other side just as much]].
* LethalChef: Zig-zagged. She does seem fully capable of making something edible, as seen with her casseroles for Mr. Krupp, but her leftover cafeteria food is so toxic it [[BrokeTheRatingScale breaks Poopypants' toxicity counter]].
* NiceGirl: Edith is shy and awkward, but she's a kind lady.
* OneSteveLimit: {{Averted| Trope}}; Edith is also the first name of Ms. Anthrope, although the latter's first name isn't mentioned in TheMovie.
* PeekABangs: One eye is covered as Mr. Krupp points out her blue eye.
* ShrinkingViolet: Especially when she's near Mr. Krupp.
* SignificantBirthDate: According to WordOfGod, it’s February 14th. ''Valentine’s Day''.
* StealthHiBye: She performs the "hi" on a few occasions, startling others.
* ThroughHisStomach: Bless her heart, she tries. She gives Mr. Krupp a tuna casserole with his name spelled on it in jalapeño peppers. Unfortunately, he doesn't know how to properly show his mutual feelings for her.
* TokenGoodTeammate: One of the only ones in the faculty who isn't mean towards any of the kids. That doesn't make her good at her job, though, as she keeps a vat of leftovers in the kitchen that can apparently be used as nuclear superfuel.
[[/folder]]

[[folder:Mr. Ree]]
[[quoteright:186:https://static.tvtropes.org/pmwiki/pub/images/rhee.JPG]]
-->'''Voiced by:''' Creator/ClancyBrown

The school janitor (who [[SuspiciouslySpecificDenial totally doesn’t have a secret past]]) that was [[CanonForeigner introduced in the animated series]].

* AlmightyJanitor
* BadassInDistress[=/=]BrainwashedAndCrazy: [[spoiler: By the Splotch in the latter's second episode.]]
* CanadaEh: He’s French-Canadian.
* ComeWithMeIfYouWantToLive: Basically says this to George and Harold after rescuing them from the T.P. Mummy.
* DarkAndTroubledPast: [[spoiler:He was a part of a government waste disposal program that went horribly wrong, which he blames himself for.]]
* DeadpanSnarker: He isn’t afraid to snark at Mr. Krupp every now and again.
-->'''Mr. Ree:''' (''to Mr. Krupp about the new French teacher, Ms. Yewh'') So, you got a crush on the “Ooh-La-La”?\\
'''Mr. Krupp:''' What? That’s ridiculous! (''proceeds to swoon a little'') [[SuspiciouslySpecificDenial It’s not like I want to take long walks at the movies, trading… butterfly kisses… or-or anything!]]\\
'''Mr. Ree:''' Whatever floats your boat, chief.\\
'''Mr. Krupp:''' My boat floats fine!\\
'''Mr. Ree:''' (''smirking'') …Liar.\\
'''Mr. Krupp:''' WHAT?!\\
'''Mr. Ree:''' Yeah, you heard me.
* PunnyName: His name is a pun on the word “mystery”.
* TraumaButton: [[spoiler: He panics when he starts to think about his past job along with the mention of 'jiggling' the toilet]].
[[/folder]]

[[folder:Students of Jerome Horwitz Elementary]]
The children that attend the same school as George and Harold who were [[CanonForeigner introduced in the movie and animated series]]. They each have their own quirky personalities that help round out the cast and make school life at Jerome Horwitz more interesting.
!!Erica Wang
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/tumblr_pbzdmzxlpr1u86juso2_400.png]]
[[caption-width-right:200:The 'Strong Female Character' this show deserves]]
--> '''Voiced by:''' Erica Luttrel

A cool and confident girl who is often involved in the adventures of George and Harold. Erica often gives words of wisdom for the boys to follow and is always three steps ahead of everyone on different occasions.

* TheAce: Based on Melvin's account, she's one of the top students at Jerome Horwitz and is involved in various clubs along with being president of several of them. Based on George and Harold's account, they think of her as being on a whole different level of cool. They even describe her as Batman [[TakeThat without the angry grumbling]].
* AmbiguousSituation: [[spoiler:In episode 11, she somehow remembers (and keeps an object from) the "Krupp is a CorruptCorporateExecutive" timeline, hinting that there's more to her than we thought.]]
** In the season 2 finale, it's implied that [[spoiler: she knows so much thanks to receiving help from her future self]].
* BadassNormal: As [[spoiler: Plungerina. Even though she lacks Captain Underpants' powers, she can still kick major villain butt]].
* BigGood: [[spoiler: Her future self is revealed to be this since she ends up becoming the President of Earth and manages to achieve world peace 2 years into her presidency. She also tells Melvin that he can guarantee himself a successful future if he makes the effort to change himself for the better]].
* BrutalHonesty: Erica's unafraid to voice her opinions when it comes to George and Harold's antics. She openly tells them that their writing of female characters is offensive and is infuriating the female demographic. She also tells them that they don't have what it takes to get away with suspension like her.
* {{Catchphrase}}: When she isn’t pulling a StealthHiBye, she usually says “I’m out” whenever she leaves.
* CoolBigSis: She fills out this role to the other kids in the BadFuture timeline. She also has these moments when interacting with George and Harold.
* TheCowl: [[spoiler: She takes on the identity ''Plungerina'' to try her hand at superheroics and proves to be very great at it]].
* DarkHorseVictory: [[spoiler:Pulls this in the season 2 finale; George, Harold, and Melvin are so preoccupied with the nanobots and each other that they don't realize that they're not the only students left in the dome, and as a result she steals victory from them at the last moment.]]
* FutureBadass: [[spoiler:Apparently grows up to become the President of Earth and achieve world peace.]]
* [[EvilCounterpart Good Counterpart]]: To Melvin. While Erica is one of the most intelligent kids at Jerome Horwitz who cares about her academic career, she has a good heart and is always looking out for her friends; unlike Melvin who only cares about himself. And while she does make critical remarks towards George and Harold regarding their shenanigans (just like Melvin), it usually comes out of genuine concern and the desire to help them learn from their mistakes (unlike Melvin who only criticizes just for the sake of feeling superior). This even extends to [[spoiler: their future counterparts. Future!Erica had little involvement in the present timeline but helped just enough so that Present!Erica could succeed on her own; Future!Melvin was overbearing towards his present self and made many decisions on his own to ensure that Present!Melvin would enter Elitenati Academy]].
* {{Main/Hammerspace}}: Where is she getting all that ice cream from?
* TheLeader: More often then not she'll lead the student body during times of crisis. In the bad timeline episode, George and Harold state that getting her to help will mean that everyone else will help too.
* MixedAncestry: She's clearly African American but her last name suggests that she has a Chinese parent.
* [[OnlySaneMan Only Sane Girl]]: Out of the rest of the cast, she’s the most level-headed.
* ThePerfectionist: An amicable example. She's responsible with her academics and wouldn't do anything dangerous or stupid to jeopardize her current standing. She even admits that she intends to be a senator when she grows up.
* TheSmartGirl: She's hyper intelligent and knows more about a given situation then the others. Lampshaded when the boys hire her to be the ''Thinks'' for M.I.S.F.A.R.T.S.
* StealthHiBye: She has a habit of popping in and out of scenes much to the confusion of the boys.
* {{Main/Tritagonist}}: Arguably the most prominent character in the series after the boys and Krupp/CU as she often plays a role in their adventures and [[spoiler: is implied to be more than what she appears to be]].
* {{Main/Troll}}: She likes to pull pranks on the boys, especially in episodes 4 and 9, claiming that the best way to make a prank is to 'prank a prankster'. [[spoiler: She even admits in episode 9 that she was never suspended at all and just wanted to mess with them]].
* UnwittingInstigatorOfDoom: She was the one who [[spoiler:suggested to George and Harold that they go to Superintendent Vil Endenemys to try to get Mr. Krupp fired before he can expel them, not knowing that Vil Endenemys is actually Melvin Sneedly’s future self, who not only fires Krupp, but expels George and Harold and then takes over the school with Melvin]].
* WomenAreWiser: She's one of the more level headed girls on the show and the boys often go to her for help during their misadventures.

!!Jessica Gordon and the Sophies
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/cap_pd101_01063605_rgb.JPG]]
[[caption-width-right:350:Left to Right (Other Sophie, Jessica, Sophie 1)]]
--> '''Voiced by:''' Dayci Brookshire

The popular girls of the school. Jessica and her crew often engage in their own girly affairs but will more often then not become involved in the wild antics of the show.

* AscendedExtra: Jessica has more speaking lines in Season 2.
* BeehiveHairdo: It’s bigger than ''her entire body''!
* TheChick: She and the other Sophies fill this role when they join M.I.S.F.A.R.T.S.
* GirlPosse: Jessica is always shown in the company of Sophie 1 and Other Sophie.
* HeroOfAnotherStory: In episode 10, after getting amnesia from the memory wipes, she and her crew become involved in [[spoiler: protecting the whales. They end up ditching school to protect them from whale hunters and even get to ride with them in the end]].
* ImprobableHairStyle: There's no way she can get her hair to be that big everyday and walk around like it's no big deal.
* ItIsPronouncedTroPAY: She pronounces “hair” as ''haar''.
* TheLeader: She takes on this role when the school is attacked by an angry swarm of Butt-erflies.
* LovableAlphaBitch: She has her mean girl moments, especially towards [[ButtMonkey Other Sophie]], but she's still very likable.
* MonsterOfTheWeek: Thanks to [[{{Main/Jerkass}} Melvin]] using her as a test subject for his new ray gun, Jessica turns into ''Messica Gorgon'' the [[OurVampiresAreDifferent Vimpire]].
* PinkMeansFeminine: Befitting her archetype, her main color is hot pink.
* RaceLift: In the book series she was white. Here, she's African American.
* RapunzelHair: [[CaptainObvious Try to guess]].
* [[SatelliteCharacter Satellite Characters]]: The Sophies only exist to serve as Jessica's clique. They haven't even spoken a single word in their appearances.
* ValleyGirl: Speaks in this tone of voice.

!! Steve "Gooch" Yamaguchi
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/tumblr_pbze2mmqgy1u86juso4_250.png]]
--> '''Voiced by:''' Evan Kishiyama

An adorable boy [[ButtMonkey who attracts misfortune to himself]] and is a good friend of the boys.

* {{Main/Adorkable}}: He definitely has these moments.
* AnimalsHateHim: Season 2 often features the poor boy in the jaws of a vicious animal.
* AsianAndNerdy: Played with. He's of Japanese descent and pretty dorky, but he defies the stereotype since studying isn't his strength or something he enjoys.
* ButtMonkey: The most likely to suffer some sort of physical abuse in an episode.
* GadgeteerGenius: Subverted. The boys give him the role as tech genius for M.I.S.F.A.R.T.S. by process of elimination. And Gooch makes it constantly clear that he has no tech skills to save himself or anyone for that matter.
* HeroOfAnotherStory: Gooch is shown to be involved in some peculiar situations while the boys are in the middle of their adventures.
* HiddenDepths: He knows how to play the organ along with the pan flute.
* InSeriesNickname: His real name is Steve but everyone calls him ''Gooch''.
* InTouchWithHisFeminineSide: He wears a pink collared shirt and isn't afraid to cry or express how he's feeling.
* {{Main/Keet}}: He's a very cheerful child.
* SuspiciouslySimilarSubstitute: Appearance-wise, Gooch bears alot of similarities to [[spoiler: Billy Doanbee-Ahiro, Harold's future husband]] if he were a child.
* WhatTheHellHero: He calls out the boys for going too far in representing Erica as a monster vampire for their comics.

!!Dressy Killman
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/tumblr_pegnah32mb1v5r6c4o3_250.png]]
--> '''Voiced by:''' Dayci Brookshire

A mellow and cheerful young girl who could very well pass for a hippie and is another friend of the boys.
----
* CharacterTic: She has a habit of singing out the last word of a sentence she's speaking.
* DidYouJustFlipOffCthulhu: She threw a dodgeball directly at Krupp's face to keep him from taking her comic book and faced no consequences for it.
* NeatFreak: [[WordOfGod According to the official guidebook]], she despises pranks, mischief, and messes.
* NewAgeRetroHippie: Her outfit, and the music she plays when auditioning as DJ for the school dance in episode 2, makes her come off as this.
* QuirkyCurls: Her orange hair is long and fluffy to portray her free spirit.
* WickedCultured: In episode 2 of Season 2, Dressy shows alot of knowledge when it comes to Ecuador since she and her parents often travel.
* YouthfulFreckles: She sports some on her face.

!!Bo Hweemuth
[[quoteright:234:https://static.tvtropes.org/pmwiki/pub/images/babyboy.JPG]]
[[caption-width-right:234:Baby boy. Baby.]]
--> '''Voiced by:''' Brennan Murray

A talented, good-hearted sculptor who wishes to have friends. He was initially alone because of all the rumors that painted him as a powerful but dangerous legend which made everyone afraid of him.
----
* AscendedFanboy: He's a huge fan of Captain Underpants and was flattered when George and Harold made him the villain in their comic book. [[spoiler: By the end of the episode, he now works with the boys in making Captain Underpants toys for the student body]].
* TheBigGuy: Because of Bo's large size, he's given the role of ''Bigs'' for the M.I.S.F.A.R.T.S.
* BlindingBangs: We don't know what his eyes look like thanks to these.
* FaceOfAThug: His gruff appearance makes him come off as a bully figure.
* FriendToAllLivingThings: At one point, Dressy tells George and Harold that she saw him save a ladybug from a spider’s web.
* GentleGiant: He’s quite a bit bigger than most of his classmates, but is a soft-hearted soul who wouldn't hurt a fly.
* HiddenDepths: Along with being a gifted sculptor, he knows how to play the banjo. It’s also hinted that he has some mechanical knowledge, as he helped Gooch fix a bicycle.
* IJustWantToHaveFriends: He earnestly wishes for this and is touched when George and Harold still want to be friends with him even after his rampage as ''Claylossus''. [[spoiler: They even have him involved in Treehouse Comix Inc. by making him the head of toy development]].
* MisunderstoodLonerWithAHeartOfGold: Before befriending George and Harold, he spent most of his time in the school’s abandoned ceramics studio, and there were enough rumors about him to make a whole horror movie franchise, but he’s really just a big sweetie.
* MonsterOfTheWeek: Was turned into the clay monster ''Claylossus'' against his will, courtesy of [[{{Main/Jerkass}} Melvin]].
* NiceHat: He wears an orange toque for a hat.
* PunnyName: His name is a play on the word “behemoth”.
* UnwittingPawn: Mr. Krupp uses Bo's reputation as an unworldy bully in order to terrorize the other kids into submission as “scared children are good children”.

!!Stanley Peets
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/download_132.jpg]]
--> '''Voiced by:''' Jorge Diaz

A sweaty farm boy who is known for having plants growing out of his armpits.
----
* BodyHorror: Stanley has avocado plants growing out of his armpits. Apparently it's a common trait among his family.
* DeepSouth: He has a thick Southern accent.
* DemotedToExtra: He hardly has a presence in Season 2. The most he gets is a silent cameo in a single episode.
* FarmBoy: He and his family run a successful farm that specializes in bountiful produce.
* YouGottaHaveBlueHair: His hair is dark green, and it’s as soaked in sweat as the rest of him.

!!Tommy
[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/tumblr_ow0uq3ohua1u86juso5_250.png]]
--> '''Voiced by:''' David Soren

A boy who is seen frequently throughout the movie hiding in his own locker.
----

[[folder:George Beard & Harold Hutchins]]
[[quoteright:324:https://static.tvtropes.org/pmwiki/pub/images/kids_5.png]]
[[caption-width-right:324:Two usually responsible kids. If something goes wrong, they're usually responsible.]]
-->'''Voiced by:''' Creator/KevinHart (George in the movie)[=/=]Ramone Hamilton (George in the animated series), Creator/ThomasMiddleditch (Harold in the movie)[=/=]Jay Gragnani (Harold in the animated series)

-->''George is the one on the right with the tie and the flat-top. Harold is the one on the left with the T-shirt and the bad haircut. Remember that now.''

* AdaptationalHeroism: While both versions of the duo are portrayed as mischievous pranksters, the movie portrays them as more noble; pulling pranks on the teachers and faculty to make school-life more tolerable for them and their fellow classmates. Their book counterparts pull pranks and make jokes at everyone's expense, and are usually the only ones laughing at the end.
* AdaptationalNiceGuy: They are still pranksters in the animated movie adaptation, but are given more heroic moments compared to their borderline-DesignatedHero counterparts. While they were still heroic and likable in the books, they are more creating humor to brighten others days rather than using it for their own amusement. This leads to the plot point in the movie that is nearly absent in the books, [[spoiler:George and Harold deciding to be nicer to Mr. Krupp because he doesn't have anyone who cares about him. This never happens in the books, where Krupp stays a fairly two-dimensional villain.]]
** This also extends to the animated series where [[spoiler: they willingly go to Krupp's office, knowing that doing so would result in their expulsion from Jerome Horwitz, in order to return his rule book since they know that [[SympathyForTheDevil his job is the only thing that makes him happy in life]] and [[WhatYouAreInTheDark taking that away would make them just like him]]]].
* {{Adorkable}}: Both of them have their moments thanks to their love for comic books and dumb jokes.
* AfraidOfBlood: Near the end of the movie, it’s implied that George is this.
-->'''George:''' You know what? Let's do a blood oath! But minus the blood! I don't wanna see the blood, no blood!
* AlliterativeName: '''H'''arold '''H'''utchins.
* ArchEnemy: These fun-loving pranksters are always finding themselves at odds with their cruel child-hating principal, Mr. Krupp, and the school snitch and teacher's pet, Melvin.
* AttentionDeficitOohShiny: The two have been diagnosed with it by second grade, but they don't mind, even treating it as a badge of honor thanks to them being one of the more creative ones diagnosed with it.
-->"All of the 'experts' at Jerome Horwitz Elementary School had their opinions about George and Harold. Their guidance counselor, Mr. Rected, thought the boys suffered from A.D.D. The school psychologist, Miss Labler, diagnosed them with A.D.H.D. And their mean old principal, Mr. Krupp, thought they were just plain old ''B.A.D.!''"
* AuthorAvatar: Their love of pranks, writing comic books and generally rebellious attitudes make them similar to Dav Pilkey himself as a child.
* BatmanGambit: [[spoiler:In book 5, they defeat Wedgie Woman by running by with a big box of hair remover spray and yelling that they hope she doesn't get her hands on their giant box of "Extra Strength Spray Starch" (Captain Underpants' one weakness). She falls for it, steals the cans and sprays them everywhere, which renders her completely bald and powerless, as her powers come from her PrehensileHair.]]
* BlackAndNerdy: George.
* BlackBestFriend: George to Harold, technically. The trope is actually subverted, as both boys are treated equals in terms of characterization -- George is not there to make Harold look good.
* BookDumb: They don't get good grades and don't particularly care about doing well in school, although they at least put in the effort to keep their grades at Bs and Cs.
* BorrowedCatchphrase: They sometimes use the word "bub" towards other characters, like Melvin and Captain Underpants.
* BrilliantButLazy: George has been stated to be smarter than kids twice his age, but he clearly doesn't see himself as a role model student.
* BullyHunter: Kindergartener George in book 9, when he witnessed Kindergartner Harold being bullied by Kipper & his goons. This prompts Kindergartner George to beat up the bullies "Indiana Jones" style.
* {{Catchphrase}}:
** '''Harold:''' Oh, No!\\
'''George:''' HereWeGoAgain
** In [[WesternAnimation/TheEpicTalesOfCaptainUnderpants the animated series]], Harold tends to say “So good!” a lot.
* ClassClown: They are known for disrupting classes and pranking others.
* ClassicalAntiHero: They are genuinely good kids; they just happen to go to a school where most of the staff are terrible, lousy people and their pranks are meant to act out against the terrible establishment. When something goes too far or it results in a supervillain, they go clean up their mess.
** Of worthy note is that they actually learn their lesson when they do something bad, such as when they realize that it's not nice to make fun of people at the end of book 4. They consider their (admittedly cruel-hearted) teachers and InsufferableGenius Melvin AcceptableTargets, however.
* CloudCuckoolander: Both of them to a certain extent, but in TheMovie, Harold constantly inserts dolphins into their comics and when he thinks about the BadFuture where he and George aren't friends anymore, it ends with a robot apocalypse, just because "it's the future, there have to be robots".
* ComplexityAddiction: In Book 9, when it comes to neutralizing resident school bully Kipper Krupp. At the beginning, he is already afraid of George due to a previous incident. Instead of [[MundaneSolution using this fact to scare Kipper into giving up his bullying ways,]] George and Harold devise a complicated plan that involves playing a series of elaborate pranks on Kipper to make him think he's being cursed by "The Haunted Pants of Wedgie Magee".
* CoolAndUnusualPunishment: In the film, Mr. Krupp decides to punish George and Harold by placing them in separate classes, hoping that doing so will annihilate their friendship. Despite the two living ''right next door to each other'', they deeply dread this punishment and react as if doing so will genuinely ruin their friendship as Krupp intended.
* DeadpanSnarker: Both of them can be pretty dry-witted.
* DisappearedDad: Harold. In the ninth book, it's revealed that his parents divorced and his dad moved to Nevada when he was 6.
* TheDividual: Really don't have any distinct personality traits that differentiate each other. George is maybe ''slightly'' smarter than Harold, but that's about it.
** The ninth book gave them individual characterizations when they were shown as kindergartners. Little Harold was shy and lonely, and spent time coming up with and drawing various superheroes to cope with the stress of being bullied and having a DisappearedDad. Little George was outgoing, quick-thinking, a prolific writer of silly stories and [[CurbStompBattle curb-stomped]] four sixth graders who were bullying Harold without breaking a sweat.
** The movie additionally elaborated on emphasizing George being bolder and more outgoing, with Harold as more reserved and more emotionally sensitive.
** Their individual characterization is actually quite similar to the way [[ThoseTwoGuys those two]] TricksterTwins [[Literature/HarryPotter Fred and George]] are different. Fred and George had some subtle ones that had to be confirmed by WordOfGod, such as Fred generally being the one who tended to take the lead and be bolder. Overall in the books, Harold is shown to be more CloudcuckooLander and sentimental (prominently when the boys disagree on whether to keep their new pterodactyl as a pet and names it Crackers, or take it back to its own time period), whereas George is more pragmatic and tends to take the lead (such as speaking first or controlling the science device on hand). Concerning their [[EvilCounterpart Evil Counterparts]], Evil!Harold seems to be the one to take the lead in general.
* DumbBlonde: Averted or maybe downplayed by Harold. He's a little more foolish and [[CloudCuckoolander odd]] than George, but he's not ''dumb''. He is, after all, one half of the creative force behind Treehouse Comix, Inc., and he and George are on about equal footing when it comes to dealing with the mayhem of Captain Underpants.
* EveryoneHasStandards: In the end of book 4, they felt remorse for making fun of Professor Poopypants.
** In an episode of the animated series, even they thought a certain idea for a prank was just crossing the line, said prank being giving all the teachers diarrhea and locking all the bathroom doors so they couldn’t get in.
* FunnyAfro: George had one when he was in kindergarten, but he shaved it off in order to disguise himself as Wedgie Magee.
* FutureMeScaresMe: In Book 10, after realizing all the trouble they caused with their pranks and time-traveling shenanigans, they swear off comic books and all fun things, deciding to be more responsible and act like grown-ups. They immediately renege on that vow after going 30 years into the future and seeing their adult selves as mean, overweight, fun-hating SadistTeacher[=s=] working for an elderly Mr. Krupp.
* GayBestFriend: [[spoiler:Future Harold to Future George.]]
* HairOfGoldHeartOfGold: Harold has blonde hair and is one of the most heroic characters (if constantly mischievous).
* HappilyMarried: [[spoiler:In the future, George has a wife and Harold has a husband.]]
* HasTwoMommies: [[spoiler:Future Harold has a husband, and they have twins named Owen and Kei.]]
* HeterosexualLifePartners: They always do everything together. In the movie, Mr. Krupp plans to break up their friendship by putting them in ''"SEPARATE CLASSES!!"'' [[spoiler:The heterosexual part is eventually subverted with Harold, however.]]
* IntergenerationalFriendship: With Captain Underpants.
* ItsAllMyFault: In book 4, they take responsibility for the role they played in Professor Poopypants' SanitySlippage. They admit that Professor Poopypants probably wouldn't have become evil if they just didn't make fun of him.
* KidHero: Not every pair of fourth-grade best friends gets to save the world with Captain Underpants.
* LaserGuidedKarma: George and Harold get hit by this a few times in the series.
** In the first book, they pull pranks that ruin everybody's day, so Mr. Krupp punishes them by blackmailing them ([[DisproportionateRetribution even though said punishment was disproportionate, though]]).
** In book 2, after ruining their peers' inventions for the Invention Convention out of spite due to [[JerkassHasAPoint Mr. Krupp justifiably banning them from participating]], Mr. Krupp puts them in detention for the rest of the school year (this is reversed in the end, though).
** In book 3, their pranks influence the lunch ladies ([[TokenGoodTeammate who aren't actually jerks to the children]]) to resign. So Mr. Krupp punishes them by not allowing them to eat school lunch and making them sit in his office. (Although it's PlayedWith in that they don't really see the first half of the punishment as a punishment, and considering that one of the lunch ladies stated during their resignation that she once ate their own cafeteria food and ''[[DamnedByFaintPraise barely got sick at all]]'', they clearly are about as good as their jobs as everyone else at the school.)
* LimitedWardrobe: Harold always wears a striped T-shirt, and George always wears a white collared shirt and tie.
* LovableRogue: They are good-natured kids with a fondness for tricks, tricks that, in the movie at least, are meant to brighten their classmates' days.
* MadLibsCatchphrase: At the beginning of every introductory comic that starts each book, George always says some variation of "We are cool!" and Harold always says "Me, too!"
* MeaningfulName: George and Harold got their names from two of Dav Pilkey’s favorite childhood books; ''Literature/CuriousGeorge'' and ''Literature/HaroldAndThePurpleCrayon''.
* MessyHair: Harold has poofy hair. The first chapter of every book always introduces him as "the one with the T-shirt and the bad haircut".
* MrImagination: They conceived many in-universe fictional superheroes such as Dog Man, Super Diaper Baby and Diaper Dog, The Amazing Cow Lady and of course, Captain Underpants. Unfortunately for them, they go to [[SuckySchool Jerome Horwitz Elementary School,]] where imagination is not only forbidden, but discouraged...
* NaughtyIsGood: They're consistently mischievous and show active disdain for the authority figures around Jerome Horwitz Elementary. However, they're also consistently portrayed in much better lights than the school's SadistTeachers, the authoritarian Principal Krupp, or smug nerd Melvin; and most of their antagonism seems to stem from the fact that the school lives to stamp out the creativity and imagination that they value above all else.
* NeverMyFault: In book 2, Mr. Krupp (rightfully) bans George & Harold for participating in the Invention Convention due to a prank the duo pulled on all the staff and students when they participated in the previous Invention Convention. Rather than admitting they were wrong for pulling such a stunt, the boys just play the victim, get angry, and sabotage the other kids’ inventions out of spite.
* {{Nice Guy}}s: Despite them being {{designated hero}}es at times, they are genuinely good kids. This is amped up in the movie and animated series, as they are shown to be popular amongst their peers (except [[TheStoolPigeon Melvin]] [[InsufferableGenius Sneedly]], of course).
* NiceJobBreakingItHero: In some form or another, all of their pranks have resulted in the mayhem that unfolds in each book. They were responsible for the majority of chaos in books 1-5.
* NotMeThisTime: In Book 6, Mr. Krupp blames them for him and the other students (except the 4th graders) getting their pants messed up with ketchup packets. While the boys were responsible for the fads, they weren't the ones who took the time to put those ketchup packets under a lot of toilets.
* OhCrap: Any time someone snaps their fingers within hearing range of Mr. Krupp, turning him into Captain Underpants.
* OlderSidekick: Harold is the older one by three months, but George is the leader of the two.
* OnlySaneMan: George is the more reasonable one at times when it comes to certain choices the duo makes.
* {{Phrase Catcher}}s: "Bubs!" by Mr. Krupp.
* RedOniBlueOni: They're both pretty rambunctious, but in general George is the bold, leader-ly Red to Harold’s calmer, more sensitive Blue.
* RidiculouslySuccessfulFutureSelf: [[spoiler:After RetGone-ing their evil future SadistTeacher selves, they travel to a different and much happier future where they've successfully published the ''Dog Man'' comic books together, and are HappilyMarried to their partners, with two children each.]]
* SaltAndPepper: Harold and George, respectively.
* ScreamsLikeALittleGirl: George in the animated series. He has a high-pitched shriek that could rival [[WesternAnimation/TheAmazingWorldOfGumball Darwin Watterson]].
* ShipperOnDeck: [[spoiler:At the end of the movie, they set up Mr. Krupp with Edith the lunch lady.]]
* SignsOfDisrepair: Their favorite prank is rearranging the letters on signs to spell something silly. [[SkewedPriorities Even when running for their lives from giant booger monsters.]]
* StatingTheSimpleSolution: In book 4, Professor Poopypants is DrivenToMadness over people constantly making fun of his name and uses {{Shrink Ray}}s and HumongousMecha to hold the world hostage, threatening to shrink everyone in the world unless they change their names to ones just as silly as his. When Captain Underpants defeats him and he's being taken away by the police, George and Harold point out that he could have simply changed his own name instead, to which the Professor confesses that such a solution had never occurred to him. Sadly, the name he chooses to change to, Tippy Tinkletrousers, is just as [[UnfortunateName unfortunate]].
* StraightGay: [[spoiler: Future Harold. Apart from having a husband, he shows absolutely no stereotypical gay traits.]]
* ThoseTwoGuys: Rare examples of the ''protagonists'' being this trope. The two have almost identical personalities.
* TrademarkFavoriteFood: George's is chocolate chip cookies and Harold's is gum, implying that they have a mutual SweetTooth.
* TraumaticHaircut: In ''Wrath of the Wicked Wedgie Woman,'' they set up a BatmanGambit to de-power Wedgie Woman (whose powers come from her PrehensileHair) by tricking her into spraying hair remover everywhere. It works, but they get caught in the blast too.
-->'''Harold:''' ''(screams)'' My mom's gonna lay hard-boiled eggs when she sees me!\\
'''George:''' Relax. Our hair will grow back.\\
'''Harold:''' That's easy for you to say. Your hair was only half an inch long!
* TheTrickster: They like to cause mischief.
* TrueCompanions: They're best friends and always do everything together, so much that a driving plot point in the movie is their fear of being placed in separate classes.
* WhatCouldPossiblyGoWrong: Their most FatalFlaw.
* WhoWritesThisCrap: [[NoFourthWall Being self-aware they are in a fictional story]], George and Harold constantly take jabs at the author whenever the plot gets weird or stupid.

[[folder:Mr. Benjamin "Benny" Krupp]]
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/mrbennykrupp.png]]
[[caption-width-right:250: The worst principal in the world.]]
-->'''Voiced by:''' Creator/EdHelms (movie), Nat Faxon (animated series)

* AbusiveParents: He has this in the animated series in the form of his mother, Bernice. She calls him a “major disappointment”, had a hand in publicly humiliating him at his 4th grade talent show, and even hung up ''pictures'' of the aforementioned public humiliation in her living room!
* ActuallyPrettyFunny: [[spoiler: In TheMovie, he admits liking the comics]].
* AdaptationalHeroism: The Movie gives him ''some'' sympathetic qualities whereas he had virtually none in the original books, [[spoiler: such as giving him a crush on Edith the lunch lady and suggesting that he's only a {{Jerkass}} because he's secretly lonely at heart. He also (secretly) likes George and Harold's comics, which was long speculated by fans (after all, how else would his hypnotized self know how to act as Captain Underpants, and about various comic plot points?)]].
* AdultsAreUseless: While competent as a principal, Mr. Krupp refused to punish Kipper and his friends in book 9 for bullying the kindergartners.
* {{Adorkable}}: Surprisingly, he shows shades of this in the movie. Whenever around Edith, he gets all stuttery. It's endearing.
* AlternateIdentityAmnesia: Neither he nor Captain Underpants can remember the other.
* ArchEnemy: Nobody in the entire school is a bigger pain in his child-hating arse than the prank-playing duo of George and Harold.
* BaldOfEvil: Which he hides under a DodgyToupee. Subverted in that his baldness only comes out when he becomes Captain Underpants.
* BigNo: [[spoiler:A rare heartwarming example in the Season 1 finale of the animated series. After George and Harold give him back his rule book (after originally planning to give it to the Superintendent to get him fired before he can expel them), apologize and are willing to accept their fate, he lets out one of these as he has a minor HeelRealization that he can’t bring himself to expel them now.]]
* TheBully: Him, along with the staff members of Jerome Horwitz, have tendencies to pick on the students. His favorite targets, however, are George and Harold.
* BurningWithAnger: You see him quite literally become “steaming mad” a few times in the books, and at least once in the movie.
* ByNoIMeanYes: When asked by George and Harold if he has plans in the evening (that they set up, unbeknownst to Mr. Krupp), he tells them it's none of their business... except that he does.
* CardCarryingVillain: He takes great pleasure in crushing the hopes and dreams of his students. In the movie and animated series, his desk is decorated with a gold plaque that reads "Hope Dies Here."
* {{Catchphrase}}: "Hey, bubs!"
* ChildHater: Stated in the first book, but it seems he hates George and Harold more than anybody else.
* DeanBitterman: He's an incredibly cruel and sadistic principal who hates his students.
* DidntThinkThisThrough: In the movie, he seems to believe that having George and Harold put in seperate classes will destroy their friendship, never taking into consideration the fact that they're neighbours, and can still see each other when they're not in class (he actually gets angry whenever he sees them together when they're outside of class).
* DodgyToupee: A black one.
* EmbarrassingFirstName: Benny, as revealed in Book 4.
* EvenEvilHasLovedOnes: He may hate kids, but there is no denying that he does care about his nephew Kipper, to the point that he won’t even punish him or his friends for bullying the kindergarteners.
* EvenEvilHasStandards: In episode 7 of the animated series, even he thought Melvin had gone too far when he turned [[GentleGiant Bo]] [[MisunderstoodLonerWithAHeartOfGold Hweemuth]] into a mindless clay monster, all so Krupp would give him a recommendation letter to attend Eliteanati Academy.
-->'''Mr. Krupp:''' When I said “make him a monster”, I didn’t ''mean'' make him a monster!
* FangsAreEvil: In the books, he's frequently and randomly drawn with [[https://realphoebejudd.tumblr.com/post/160733916302/mr-krupps-sharp-toothed-appreciation-post sharp teeth]] when he gets mad.
* FatBastard: Overweight and cruel.
* FreudianExcuse:
** [[spoiler:In the movie, it's shown that he lives alone, and has no-one who cares about him, which is implied to be the reason for his bad attitude.]]
** The animated series adds a bit more onto this. He has a [[AbusiveParents less-than-supportive mother]], who had a hand in publicly humiliating him after he did poorly at his 4th grade talent show.
* FunHatingConfiscatingAdult: In the movie, he has a drawer full of things he confiscated from George and Harold, including several of their comics. [[spoiler:He gives the comics back at the end of the movie after admitting that they were ActuallyPrettyFunny.]]
* HairTriggerTemper: Mr. Krupp is shown to get angry a lot in the books, usually at George and Harold. Apparently, it's also in the movie.
* HelplessGoodSide: Inverted. Mr. Krupp is a complete {{Jerkass}} while Captain Underpants is a good guy.
* HeyYou: He calls George and Harold "bubs".
* HypnoFool: How he gained the Captain Underpants persona in the first place. He reverts every time he hears someone snapping their fingers, due to George and Harold improperly undoing the hypnosis.
* InformedJudaism: Judging from the fifth book where he nearly gets married and there is a rabbi at the almost-wedding, Mr. Krupp is Jewish. Of course, this might just have been an excuse to have Harold tell the rabbi "Silly rabbi, tricks are for kids!"
* IronicBirthday: AprilFoolsDay (April 1), and he hates pranks, jokes and mischief.
* JekyllAndHyde: Zigzagged. His regular personality is a jerk, while the Captain is sunny and cheerful.
* {{Jerkass}}: He's unreasonable, disagreeable, and mean in every way.
* JerkassHasAPoint: While Mr. Krupp is a ''major'' {{jerkass}} and ChildHater, he has every right to be angry at George and Harold for pulling pointless (and even dangerous) pranks on staff members and their fellow students. For example, merely having the boys pack their own lunch to school and eat in his office for influencing the lunch ladies to resign in book 3 comes off as a lenient punishment (considering how there would have been no lunch ladies to prepare school lunch for the students on the day after the lunch ladies resigned, and also due to the fact that it would be difficult to find a replacement on such short notice).
** His plan for getting back at George and Harold is less evil in the movie. In the first book, he blackmails them into essentially being his slaves, complete with forced personality alterations. In the movie, he makes the much more reasonable decision to try to put them in separate classes. That said, his ultimate hope is that putting them in separate classes will also cripple them emotionally due to how close the two are, thus breaking them into the miserable drones he tries to make of all his students.
** He also justifiably banned George & Harold from participating in the Invention Convention competition in Book 2. This is due to their prank from the previous year: they invented a type of glue that was activated by warmth & applied it on the chairs, getting the whole student body & staff members stuck on them when they sat down. He was also later justified in giving George & Harold permanent detention for the rest of that school year due to them sabotaging everybody else's inventions & ruining the Invention Convention competition.
* JerkWithAHeartOfGold: [[spoiler:He becomes this at the end of the movie]].
* LargeHam: Especially in the movie, courtesy of Creator/EdHelms.
** Nat Faxon actually manages to [[TurnedUpToEleven take it to another level]] in the animated series.
* LoveRedeems: Movie only. When George and Harold snoop around in his house, they find out that he lives alone and correctly deduce that he's so bitter all the time because he's lonely. [[spoiler:At the end of the movie, they set him up on a date with Edith the lunch lady to make him happier. And it works--he's in such a good mood that he [[PetTheDog gives them back their confiscated comics]] and admits that they were ActuallyPrettyFunny. Awww.]]
* MadeOfIron: As a result of him drinking Super Power Juice as Captain Underpants, Mr Krupp has displayed, particularly in the later books, superhuman endurance, such as being able to fall from a large tree without injury.
** In the movie, he's capable of taking a beating, such as getting hit by a car, getting bounced around by a giant purple gorilla balloon, and falling at least three to five stories without taking a scratch (and that's before getting powers!)
* ManchurianAgent: His encounter with the Hypno-Ring (and then getting splashed with water) has left him like this.
* NeverMyFault: He gets in on this in book 5, by blaming George & Harold for tricking them into (almost) getting married. While George & Harold did play a role in this, neither him or Ms. Ribble speak up & say that they did not want to marry each other.
* NotSoDifferent: In the flashback in the ninth book, he shows enough technical know-how about a prank pulled on his nephew Kipper, to imply that he just might have been as much of a prankster as George and Harold when he was young.
* OOCIsSeriousBusiness: When he smiles at George and Harold in the first book, the boys are immediately unnerved, having never seen him do so and realizing he's on to them. In the film, the sight of him smiling actually freaks them out and gives them chills. Then in Book 11, he happily greets George and Harold the day after they take an important test, and even ''hugs them''. They immediately know something’s up.
* PerpetualFrowner: In sharp contrast to his Captain Underpants form, who is a PerpetualSmiler. If he does smile, it's usually a [[SmugSmiler smug smile]] or a SlasherSmile.
* PrematurelyBald: In the animated series. If what Captain Underpants says in episode 4 is true, Krupp started going bald in his ''teens''.
* PunnyName: His real name-- Benny Krupp-- is a pun on the word "bankrupt."
* SadistTeacher: A sadist principal, rather.
* ScaryTeeth: Has a tendency to spawn fangs on occasion.
* ScrewThisImOuttaHere: After getting caught in a rainstorm during battle in Book 8.
* SignificantDoubleCasting: In the movie, Creator/EdHelms voices both him and Captain Underpants, his superhero alter-ego. He separates the two characters by giving Mr. Krupp a deeper, more gravelly voice while Captain Underpants is higher pitched and smoother.
* SlouchOfVillainy: A [[http://celebi9.tumblr.com/post/161751457895/some-pictures-of-the-captain-underpants-artbook subtle]] one in the movie, to differentiate his body language from Captain Underpants, who stands up tall and straight with confidence.
* SourOutsideSadInside: He may be a mean, bullying principal, but the movie reveals that he lives by himself in a lonely house, with nobody who cares about him. [[spoiler:George and Harold fix his problem by hooking him up with Edith the lunch lady.]]
* StoutStrength: Despite his chubby frame, he's surprisingly strong. In the second book, he kicked open a door so hard, he ripped it '''right off its hinges'''. And this was ''before'' Captain Underpants got superpowers!
* TokenEvilTeammate: Of the few times he has been forced to team up with George and Harold.
* TookALevelInKindness: [[spoiler:At the end of the movie, when he returns the comics he confiscated from George and Harold. And while he lightly criticizes the comics at first, he then remarks that he found them ActuallyPrettyFunny. It's not much, but it's a start.]]
* TrademarkFavoriteFood: Episode 6 of the animated series gave him a rather... ''bizarre'' one; guacamole.
* VillainProtagonist: He's the evil civilian alter-ego of TheHero.
* WeWantOurJerkBack: Downplayed. It's not that George and Harold ''like'' (or even miss) having him around -- it's just that Captain Underpants is too dumb to be useful, and often causes more problems than he solves. Lampshaded in the movie, where the boys comments that the Captain is a bigger problem than Krupp ''ever'' was. At the end of the books, the boys always turn the Captain back into Krupp once the Captain's done his thing.
* WhenHeSmiles: [[spoiler:At the end of the movie, when he gets hooked up with Edith the Lunch Lady (no thanks to George & Harold), he's shown to be smiling and genuinely happy]].

[[folder:Captain Underpants]]
[[quoteright:260:https://static.tvtropes.org/pmwiki/pub/images/captain_underpants_flying__1.png]]
[[caption-width-right:260:The Waistband Warrior himself.]]
-->'''Voiced by:''' Creator/EdHelms (movie), Nat Faxon (animated series)

* {{Acrofatic}} Even before he gains superpowers, he does pretty well despite being out of shape.
* {{Adorkable}}: How positive he is can make him come off as this.
* AmusingInjuries: In the movie, when he attempts (and fails) at being a superhero.
* BadassCape: Usually improvised from a nearby red curtain with black polka dots. [[ContrivedCoincidence And there will always be one nearby when he transforms.]]
* BaldOfAwesome: As the Captain, he sheds Krupp's DodgyToupee.
* BewareTheNiceOnes: He's a good-natured sweetie but still incredibly badass.
* BewareTheSillyOnes: He's a goofy and jubilant hero who faces all threats with a smile; he'll also give you a good thrashing with his super strength.
* BigFun: Has these moments in both the movie and animated series.
* BroughtDownToNormal: [[spoiler:In Book 12, Sir Stinks-A-Lot drains the Super-Power Juice out of his DNA and wipes the brainwashing that turns him into Captain Underpants, causing him to revert back to Mr. Krupp for good]].
* CaptainSuperhero: Has TheCaptain in his title.
* CatchPhrase: "Tra-la-laaaaaaaa!"
** To a lesser extent in the movie: "Now it is time to FLY AGAIN!"
* TheCharmer: He shows shades of this in the movie, if the scene where he [[spoiler:flirts with Edith the Lunch Lady]] is any indication.
* ClapYourHandsIfYouBelieve: Captain Underpants loses his powers by putting on clothes, because that's how he believes his powers work.
* CuriousAsAMonkey: Has had moments of this in the books, but even more so in the movie.
* DoesNotLikeShoes: As he clearly did not wear any form of shoes when he is just in his cape and underpants.
* FlyingBrick: In the third book, he gains flight and super strength after drinking Super-Power Juice. It seems it only applies to the Captain Underpants identity since Mr. Krupp never demonstrates superpowers outside of superhuman durability.
* FriendToAllChildren: In comparison to Mr. Krupp the ChildHater. In TheMovie, [[spoiler: he goes as far as opening a carnival for the whole school]].
* FunPersonified: Especially in the movie. He is almost always in a good mood.
* GodzillaThreshold: Several books have George and Harold bring out Captain Underpants as a last resort, preferring to deal with the threat themselves before having to change him.
* GoodIsDumb: Mr. Krupp isn't too bright but at least some degree of common sense. Captain Underpants on the other hand is a full blown moron, but has a heart of gold.
* TheHero: The main hero of the books, though he gets sidelined a bit in Book 7 and 8.
* HeroicBuild / TemporaryBulkChange: In the film, when he gains superpowers, he briefly gains the body of ''Superman'' before reverting back to his normal, rotund physique.
* HorribleJudgeOfCharacter: In the film. While posing as Mr. Krupp, he hires Professor Poopypants as science teacher, having a good feeling about him even as the Professor makes no effort to hide being evil.
* HumanAlien: Only in the origin issue that George and Harold wrote for his backstory, where he was born on the planet Underpantyworld and raised on Earth as a human. Biologically, he is 100% human, due to being the alter-ego of the human Mr. Krupp.
* IdiotHero: He is a sweet-natured and determined hero but has the mind the size of a pebble.
* IntergenerationalFriendship: With George & Harold.
* InterspeciesAdoption: In the movie, his adoptive parents are a pair of anthropomorphic dolphins.
* LargeHam: You can be sure that Creator/EdHelms was enjoying himself a lot while voicing him.
* MagicFeather: Thanks to the PlaceboEffect, he believes he loses his powers when attacked with extra-strength spray starch. George and Harold retcon his backstory so that by saying "I summon the power of Underpantyworld," spray starch has no effect on him.
* ManChild: He's a grown man, running around in his underwear, and acts very childish and immature. This is turned UpToEleven in the movie, as George and Harold have to constantly keep an eye on him as if he is a child.
* MuggleFosterParents: In his backstory written by George and Harold, he was raised by a human couple after being sent away from Underpantyworld by his parents shortly before it was destroyed. His movie backstory is almost identical, except for the fact that his foster parents are now dolphins. For some reason (presumably because Harold likes dolphins and George saw no reason to tell him no since, hey, [[RuleOfFunny it's hilarious]]).
* NiceGuy: He likes to help out others and is protective of George and Harold.
* NonSequiturThud: [[spoiler:When he (temporarily) loses all of his superpowers and falls down three stories in Book 7]].
--> Mommy, my train has been swimming in the piano.
* PapaWolf: If George and Harold are in danger, he will do everything he can to get them out safely. Highlighted in the movie; [[spoiler: his superpowers don't kick in until he swallows some of the radioactive cafeteria leftovers after hearing George and Harold crying for help.]]
* RedIsHeroic: His red cape.
* RubberMan: In one episode of the animated series. In the alternate timeline in episode 11, he gets these powers after getting thrown into a vat of radioactive molten plastic.
* SecretIdentity: As noted in the first book, "His true identity is so secret, [[ManchurianAgent even HE doesn't know who he is]]!" In TheMovie however, [[spoiler: George and Harold convince him to take the identity of Mr. Krupp]].
* SignificantDoubleCasting: In the movie, Creator/EdHelms voices both him and Mr. Krupp, his civilian alter-ego.
* SkewedPriorities:
** He'll absolutely refuse to go fight crime without a cape; to the point where he ran out on George and Harold to go buy a cape once.
** He also very much values his look; he's reluctant to put clothes on at all.
** He was also extremely hesitant to give up his cape in book 6 even though it meant saving the life of Ms. Anthrope.
--> '''Ms. Anthrope:''' [[LampshadeHanging FORGET ABOUT YOUR STUPID CAPE]]!!
* SuperheroSobriquets: The Waistband Warrior.
* SuperPoweredAlterEgo: As of book 3.
* SuperpoweredEvilSide: Inverted. The alter ego is actually good, as opposed to the civilian personality which is evil.
* SuperNotDrowningSkills: [[spoiler:In the movie, he survives being submerged in liquid radioactive cafeteria leftovers for an extended length of time with no ill effects.]]
* UnderwearOfPower: Takes it a step further being it all that he wears.
* WalkingShirtlessScene: The only thing he wears is a cape and his underwear.
* WeaksauceWeakness: Believes that he loses his powers when in contact with starch [[spoiler: until George and Harold retcon his origin story in book 5 to make him immune to it]]. His true weakness however is getting splashed in the face with water, which makes him revert back to Mr. Krupp. Yes, this does mean that his only weakness is a substance that covers roughly seventy percent of the Earth's Surface.
[[/folder]]

[[folder:Sulu]]
[[quoteright:122:https://static.tvtropes.org/pmwiki/pub/images/screen_shot_2016_02_07_at_74657_pm.png]]
[[caption-width-right:122:That's one badass hamster!]]
----
* BadassAdorable: He's a hamster who can lift objects twenty times his size with ease and singlehandedly beat down Melvin after he turned into a monster.
* BrainwashedAndCrazy: For a time thanks to [[EvilCounterpart Evil! George and Harold's]] 3D Hypno Ring.
* ComboPlatterPowers: Melvin programmed in a lot of powers into the robo-hamster he fused Sulu with. Once he became cybernetic, he gained SuperStrength, SuperSpeed, SuperToughness, EyeBeams, and {{Flight}}.
* {{Cyborg}}: A cyborg ''hamster''.
* FluffyTheTerrible: A little hamster who can beat people up and fight rampaging monsters.
* InterspeciesRomance: [[spoiler:He fathered some hamster-pterodactyl babies with Crackers.]]
* KilledOffForReal: [[spoiler:In Book 10 alongside Crackers when they [[HeroicSacrifice sacrifice themselves to save the world]] by sending Tippy to the time of the Big Bang while he was holding a bomb, resulting in all of them dying.]]
* LoyalAnimalCompanion: To George and Harold, when they take him in after he's abandoned by Melvin.
* RidiculouslyCuteCritter: An adorable hamster.
* TeamPet: Along with Crackers.
[[/folder]]

[[folder:Crackers]]
[[quoteright:205:https://static.tvtropes.org/pmwiki/pub/images/screen_shot_2016_02_07_at_74724_pm.png]]
[[caption-width-right:205:[[Film/JurassicPark Clever]] [[SamusIsAGirl girl.]]]]
----
* EverythingsBetterWithDinosaurs: A pterodactyl.
* InterspeciesRomance: [[spoiler:Revealed to have mated with Sulu and laid three eggs which hatched into hamster-pterodactyl babies.]]
* KilledOffForReal: [[spoiler:In Book 10 alongside Sulu. They both die in the explosion of Tippy holding a bomb while they were in the Big Bang.]]
* LoyalAnimalCompanion: To George and Harold, saving their lives on a number of occasions.
* SamusIsAGirl: [[spoiler:The reason why Evil!George and Harold's 3D Hypno-Ring didn't affect her when she and Sulu were captured by them in Book 8, though this only became truly obvious after Book 11]].
* TastesLikeFriendship: It became friendly to George and Harold after being lured with crackers, hence its name.
* TeamPet: Along with Sulu.
[[/folder]]

[[folder:Melvin Sneedly]]
[[quoteright:184:https://static.tvtropes.org/pmwiki/pub/images/f739f0a8_df01_4c75_b65d_6d57a2e4771d.png]]
[[caption-width-right:184: Grade-A Suck Up]]
-->'''Voiced by:''' Creator/JordanPeele (movie), Jorge Diaz (animated series)

George and Harold's brainy classmate, he first appeared in book 2 and as a background character in later books, before he became more integral to the plot (and TookALevelInJerkass to boot).
----

[[Characters/CaptainUnderpantsGeorgeBeardAndHaroldHutchins George Beard and Harold Hutchins]]

[[https://tvtropes.org/pmwiki/pmwiki.php/Characters/CaptainUnderpantsGeorgeBeardAndHaroldHutchins George Beard and Harold Hutchins]]

* BerserkButton: He loses his composure when he it comes to loud noises.

* IJustWantToHaveFriends: He earnestly wishes for this and is touched when George and Harold still want to be friends with him even after his rampage as Claylossus. [[spoiler: They even have him involved in Treehouse Comix Inc. by making him the head of toy development]].

* MonsterOfTheWeek: Was turned into a clay monster against his will, courtesy of [[{{Main/Jerkass}} Melvin]].

[[caption-width-right:210: [[{{Series/TheIncredibleHunk}} You wouldn't like him when he's angry.]]]]

An adorable boy [[ButtMonkey who attracts misfortune to himself]] and a good friend of the boys.

A talented, good-hearted sculptor who wishes to have friends. He was initially alone because he was too shy to talk to anyone and there were tons of rumors that painted him as a powerful but dangerous legend among his peers.

A boy who is seen frequently throughout the movie climbing into his own locker and shutting the locker door behind him.

[[folder:Professor Pippy P. Poopypants/Tippy Tinkletrousers]]
[[quoteright:206:https://static.tvtropes.org/pmwiki/pub/images/latest__3_jpg.png]]
[[caption-width-right:206:[[BerserkButton Don't make fun of]] [[SchmuckBait his name.]]]]
-->'''Voiced by:''' Nick Kroll

A brilliant scientist from New Swissland who turned to villainy after being made fun of because of his ridiculous name one too many times by the world and children of all ages. He is a recurring villain that the boys and Captain Underpants have to face on various occasions.

A cool and confident girl who is often involved in the adventures of George and Harold. Erica often gives words of wisdom for the boys to follow and is always a step ahead of everyone on different occasions.

* WickedCultured: In episode 2 of Season 2, Dressy shows alot of knowledge when it comes to Ecuador since she and her parents often travel alot.

George and Harold's homeroom teacher as well as the Wicked Wedgie Woman in Book 5. She, like many of the faculty members, enjoys being cruel to the students by having them complete long and difficult assignments.

The Purple Potty counterparts of our heroes. Rotten to the core and enjoy using their supervillain creation to do whatever sinister schemes they want.

* BigGood: [[spoiler: Her future self is revealed to be this since she ends up becoming the President of Earth and manages to achieve world peace in 2 years time. She also tells Melvin that he can guarantee himself a successful future if he makes the effort to change himself for the better]].

* [[EvilCounterpart Good Counterpart]]: To Melvin. While Erica is one of the most intelligent kids at Jerome Horwitz who cares about her academic career, she has a good heart and is always looking out for her friends; unlike Melvin who only cares about himself. And while she does make critical remarks towards George and Harold regarding their shenanigans (just like Melvin), it usually comes out of genuine concern and the desire to help them learn from their mistakes (unlike Melvin who only criticizes just for the sake of feeling superior). This even extends to [[spoiler: her future self being a good counterpart to Melvin's future self. Future!Erica had little involvement in the present timeline but helped just enough so that Present!Erica could succeed on her own; Future!Melvin was overbearing towards his present self and made many decisions on his own to ensure that Present!Melvin would enter Elitenati Academy]].

* {{Main/Troll}}: She likes to pull pranks on the boys, especially in episodes 4 and 9, claiming that what better way to make a prank then to 'prank a prankster'. [[spoiler: She even admits in episode 9 that she was never suspended at all and just wanted to mess with them]].

George and Harold's homeroom teacher as well as the Wicked Wedgie Woman in Book 5.

[[caption-width-right:185: [[[[{{Film/Us}} "We are our own worst enemy"]]]]

* SadistTeacher: Prior to the events of book 5.
** Subverted in the movie and cartoon. In the former, she's just apathetic and uncaring about the information she's teaching to her students. In the latter, she's just as tough as in the books but lacks the twisted sadism from her book counterpart.

* BigBeautifulWoman: She's a large bodied woman and is beautiful both inside and out.

* AscendedExtra: She has more speaking lines in Season 2.

* MonsterOfTheWeek: Thanks to [[{{Main/Jerkass}} Melvin]] using her as a test subject for his new ray gun, Jessica turns into ''Messica'' the [[OurVampiresAreDifferent Vimpire]].

* {{Main/Adorkable}}: He definitely has these moments.

* DemotedToExtra: Doesn't have any lines in Season 2. The most he gets is a cameo in a single episode.

* EvilCounterpart: No real explanation as to who. Evil George and Harold are mean-spirited and wicked children who make their own comic books. However, they are actually more talented than their good counterparts, creating much better drawn comics with proper spelling and grammar. Inverted with Mr. Krupp, who is a nice principal with a good sense of humor.

* BigBeautifulWoman

* RecurringBoss: She's been the MonsterOfTheWeek more times out of all the faculty members. She was the main head for the''Homework Hydra'', the Queen of the [[BeeAfraid Zombees]], and the Wicked Wedgie Woman if you count the book series.

* KarmaHoudini: Despite [[spoiler: capturing the Chupabacra's lover]], Meaner gets away scott-free after [[spoiler: she finds a new partner in Poopacabra]].

!!Jessica Gordon

* SatelliteCharacter: The Sophies only exist to serve as Jessica's clique. They haven't even spoken a single word in their appearances.

* AsianAndNerdy: Played with. He's of Japanese origin and pretty dorky, but he defies the stereotype since studying isn't his strength or something he enjoys.

[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/download_132.jpg]]

[[quoteright:186:https://static.tvtropes.org/pmwiki/pub/images/tumblr_pbzdmzxlpr1u86juso2_400.png]]
[[caption-width-right:186:The 'Strong Female Character' this show deserves]]

* [[EvilCounterpart Good Counterpart]]: To Melvin. While Erica is one of the most intelligent kids at Jerome Horwitz who cares about her academic career, she has a good heart and is always looking out for her friends; unlike Melvin who only cares about himself. And while she does make critical remarks towards George and Harold regarding their shenanigans (just like Melvin), it usually comes out of genuine concern and the desire to help them learn from their mistakes (unlike Melvin who only criticizes just for the sake of feeling superior). This even extends to [[spoiler: her future self being a good counterpart to Melvin's future self. Future!Erica had little involvement in the present timeline but helped just enough so that Present!Erica could succeed on her own while Future!Melvin was overbearing towards his present self and made many decisions on his own to ensure that Present!Melvin would enter Elitenati Academy]].

[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/tumblr_pbzdmzxlpr1u86juso2_400.png]]
[[caption-width-right:350:The 'Strong Female Character' this show deserves]]

George and Harold's homeroom teacher as well as [[spoiler: Wedgie Woman in Book 5.]]

* RecurringBoss: She's been the MonsterOfTheWeek more times out of all the faculty members. She was the main head for the "Homework Hydra", the Queen of the Zombees, and the Wicked Wedgie Woman if you count the book series.

** Subverted in the movie and cartoon. In the former, she's just apathetic and uncaring about the information she's teaching to her students. In the latter, she's just as tough but lacks the extreme sadism from her book counterpart.

-->

* AsianAndNerdy