!Main Characters
[[folder:Jimmy Neutron]]
->Voiced by: Creator/DebiDerryberry

-->'''Full Name''': James Isaac Neutron

The main protagonist. He is a boy with a stunning IQ and a love for science. From Hypercubes to Hypnorays, Jimmy can whip up the most amazing inventions. However, things have a way of going awry, and more often than not, Jimmy has to save the day from himself. But with friends, family, and a secret lab, there's no problem this boy genius can't handle. Right?
* AdaptationPersonalityChange: In the movie, he was awkward, childlike, naive, clumsy and shy. In the series, he's the arrogant, well-meaning, show-offy, know-it-all genius we know and love. Basically he was WesternAnimation/JacobTwoTwo if he was a boy genius.
* {{Adorkable}}: An adorable and dorky boy genius, who happens to be the main character. This was more evident in the movie and shorts.
* AdorablyPrecociousChild: During the movie (and to a degree, season one).
* AesopAmnesia: At least half of the episode plots wouldn't happen if Jimmy would remember how often his inventions backfired or that using his genius for his own ends has its consequences.
--> '''Cindy''': Jimmy, haven't you learned from the Yolkian incident not to talk to intergalactic strangers?
* AllOfTheOtherReindeer: Jimmy's brains and brilliance (along with him endangering the town) make him unpopular with the other kids and as a result, he's made fun of and bullied by them.
* AnimeHair: Lampshaded consistently.
* AntiHero: Jimmy is a complex character, often prone to arrogance and mischief, although the good side of his personality usually outweighs the bad one.
* BelligerentSexualTension: With Cindy.
* BigDamnHeroes: ALL THE TIME. Often Lampshaded, in fact.
* BigNo: Whenever Jimmy comes to any shocking realization, you can bet the whole of Retroville will know about it instantaneously.
** In ''The Tomorrow Boys'', after learning he gets married to Cindy. In a bit of LeaningOnTheFourthWall, the scream cuts to a commercial. When the show comes back on, Sheen and Carl comment that he had been screaming for four minutes straight.
** Another Cindy-related moment is when he finally succeeded in asking Cindy on a date, only then he realized what he'd done
--->'''Jimmy''': *jumping and pumping fist to the air* "I did it! She likes me! She's gonna go out with me! I made a date with Cindy!" *beat* [[BigNo "NOOOOOOOOOOOOOOOOOO!"]] [[SkywardScream *shot of him from up, and then zooms out to Retroville and Earth*]]
** It even happens with a similar situation where in VideoGame/JimmyNeutronVsJimmyNegatron, where Cindy falls in love with Negatron.
--->'''Jimmy''': Not that! Anything but that! [[BigNo "NOOOOOOOOOOOOOOOOOO!"]]
* BlackSheep: In one episode, most of the Neutron extended family views him as such, correctly pointing out that, while Jimmy may have saved the day quite often, more often than not, it was one of his inventions that [[NiceJobBreakingItHero caused the problem in the first place]]. Luckily at the end, they realize Jimmy saved the entire Neutron clan and learn to appreciate him.
* BrainyBrunette: Brown hair? Check. Incredibly intelligent? Check.
* BrilliantButLazy: Why do something as simple as neatly put away your piles of pants when you can implant chips in them that do it for you? Carl and Sheen call him out on this, though.
* BreakTheCutie: He becomes a victim of this whenever something really bad happens to someone he deeply cares about. Especially Goddard. This also happens when his insecurities are shown.
* BreakoutCharacter: During the time of the film and the early run of the series, Jimmy became the mascot for {{Creator/Nickelodeon}}.
* BunglingInventor: While he's undoubtedly a genius, the plots of most episodes are kicked off when his inventions go haywire.
* ButtMonkey: His inventions usually cause troubles. And when it doesn't come to his inventions, he's picked on by those left and right.
* CassandraTruth: In the episode, "The Eggpire Strikes Back", no one believes Jimmy when he says that the Yolkians, the villains from the film, are still just as evil as ever, until the Yolkians trap them in the park and sic Poultra on them.
* CatchPhrase: Originally "Gotta blast!" "Think, think, THINK!" and "Brain blast!". The show eased off on these as it went on, eventually getting rid of them entirely. (One exception is "And now, my latest invention, the (insert plot-related-device here!)", which stayed for most of the series' run.)
* ChickMagnet: He gets a lot of attention from girls both in-universe and in fandom.
* ChildProdigy: A teenage boy genius who has an impossible IQ of 210.
* CheatersNeverProsper:
** In "Maximum Hugh", he and Hugh are disqualified from the picnic games along with the other families for cheating.
** Jimmy finds this out the hard way in "The Retroville 9" when he and his friends lose the baseball championships without scoring a single point. Then, Tremendous Jackson offers this hilarious line:
--> '''Tremendous Jackson''': Somewhere in the Rytridian Galaxy, Ultra Lord weeps.
** In "Jimmy for President", he gets caught cheating to win the election and is disqualified.
* CrazyPrepared: His watch, whose powers depend mainly on the plot. Can include lasers, freeze rays, magno-rays, GPS, tracking devices…you name it, there's probably a gadget for it tucked away in there.
* DeadpanSnarker: In season three's Carl Wheezer Boy Genius.
--> '''Jimmy''': *science babble about a spider*
--> '''Sheen''': Fascinating! Can you make it do the hokey pokey?
--> '''Jimmy''': Sheen, go home.
* DepartmentOfRedundancyDepartment: Has a tendency to do this a lot.
* DitzyGenius: He's undeniably smart, but has a lack of common sense and can be arrogant.
* DrunkWithPower: In "Hall Monster".
* {{Expy}}: He's very similar to [[WesternAnimation/DextersLaboratory Dexter]], being a diminutive and easily frustrated boy genius who has his own laboratory which leads to hilarious mishaps. One wonders what it would have been like if he had to deal with Dee Dee.
* FatalFlaw: Jimmy's greatest flaws are a combo of {{Pride}} and his lack of common sense; in fact, many of the conflicts in the show are born out of this.
* TheFriendNobodyLikes: However, even though it is shown that while his friends don't like him, it doesn't mean they don't care about him especially in Lights Camera Danger.
* FutureLoser: In the 'BadFuture' of ''The Tomorrow Boys'', Jimmy is a slack-jawed loser, wanted by the evil dictator Libby, with a five-o'clock shadow and Cindy as a wife. Naturally, Jimmy is [[FutureMeScaresMe less than impressed]].
* GadgeteerGenius: He is only a kid, but he has already surpassed any known scientist in capablity. Each episode focuses on one of his invention although his inventions usually fall prey to FlowersForAlgernonSyndrome.
* GetBackToTheFuture: Jimmy's dad screwed up with one of his inventions, leaving him, Carl and Sheen in the past.
* HeCleansUpNicely:
** When Jimmy shows up in a tux for Jet Fusion's wedding to Beautiful Gorgeous in "My Big Fat Spy Wedding", Cindy promptly gets little hearts in her eyes.
--> '''Cindy''': So Neutron's the best man? Yeah, more like the best NERD! I bet he'll look like a total… ''(Jimmy shows up outside the church in a tux. Cue fade to pink background, [[WingdingEyes eye-hearts]] and hair patting)'' …HUNKMUFFIN.
** During ''Love Potion #976-J'', when Jimmy cleans up for his date with Cindy. Said almost word-for-word by Cindy.
* HeightAngst: He's shorter that the main casts (and Retroville kids his age in general), and he loses his temper when someone mentions or ridicule his short stature.
* HellYesMoment: Often. Especially when he's given up all hope...and then his friends forgive him for being arrogant/apologize for being stupid/come back to save him.
* HulkOut: His actual superpower in "The N-Men". He becomes ComicBook/TheIncredibleHulk with elements of The Thing of the ComicBook/FantasticFour, granting him inhuman strength, agility, and a HealingFactor.
* GiveGeeksAChance: He gets a lot of attention from girls both in and out of universe.
* IdiotHero: For a genius, Jimmy sure makes a lot of utterly stupid decisions. In fact, most of the conflict that goes on in this show is the result of Jimmy making a questionable judgment call in the first place regarding his experiments. But then again, Jimmy's lack of common sense is arguably one of the main points of the series. He may be a "genius," but he's still a child.
* ImYourWorstNightmare: His quote when first introducing himself and the others as N-Men.
-->'''Jimmy''': "Who am I? I'm your worst nightmare."
-->'''Cindy''': "By the way Neutron, who said you can issue a corny battle cry and where do you come up with N-Men?"
* InsufferableGenius: At times, but often more pronounced when Cindy's around. He doesn't mean to be.
* IntelligenceEqualsIsolation: Sometimes intelligence isolates him, often he sets the (horrible) events of the plot in motion causing him to be isolated, sometimes the characters realize they need his intellect &/or like him more than they let on, and sometimes he's just an insufferable genius. He actually purposely made himself stupid in one episode to end his misery, but the machines accidentally set his intelligence so low he became a complete moron.
* JerkWithAHeartOfGold: Jimmy tends to be arrogant and snarky, creating various inventions for his own selfish intentions. However, in the end, he will do the right thing.
* KidHero: Jimmy is only an elementary school student but always saves the day from trouble, albeit caused by his own mistakes.
* LittleProfessorDialogue: Well he does actually have an IQ of ''210''.
* LovableNerd: Which is why girls in and out-of universe love him.
* NerdsAreInnocent: He's an adorable and dorky child prodigy who loves and excels at science...and still believes in cooties.
* NerdsLoveToughSchoolwork: Completely averted - in fact, Jimmy hates school, just like any normal kid.
* NeverMyFault: He gives this treatment to Cindy towards the end of the series. A good example would be in "King of Mars".
* NiceJobBreakingItHero: 99 out of 100 times, his inventions end up causing problems for everyone in Retroville, leading him to fix what he broke. As revealed in one episode, the majority of the Neutron extended family views him as the BlackSheep as a result. In "The Incredible Shrinking Town", Libby remarks that Jimmy's endangered the town so often that she's just StoppedCaring.
* NoSocialSkills: He's not very social. He keeps telling himself to work on them.
* OddFriendship: An adorable boy genius who is best friends with an asthmatic hefty boy who's obsessed with llamas, a hyperactive Aztecan kid who's obsessed with a superhero, a skateboarding bad boy, his academic rival, a sassy girl who loves music and a ditzy dumb blonde.
* PetsHomageName: Jimmy designed and built his robot dog and named him Goddard in honor of rocket science physicist and inventor Robert Goddard. Especially apt when, in his first animated feature film, Jimmy is able to ride upon Goddard like a space bike.
* ProperlyParanoid: He knew better than to trust the Yolkians in "The Eggpire Strikes Back."
* PuppyLove: With Cindy.
* RidiculouslySuccessfulFutureSelf: In the 'good future' of ''The Tomorrow Boys'', Jimmy is the first person to ever win the Nobel Prize in bulk. However, that was just a prediction, only Jimmy can make it happen.
* RivalTurnedEvil: In ''The N-Men''...
* ScienceHero: He embodies this trope for kids shows, along with [[WesternAnimation/DextersLaboratory Dexter]].
* SensitiveGuyAndManlyMan: The sensitive guy to Nick's manly man in the film.
* SesquipedalianLoquaciousness: A frequent user and abuser.
* SlapSlapKiss: With Cindy.
* TeensAreShort: Well, Jimmy at least. Though sometimes he appears to be the same height as some of his friends, possibly an animation error.
* TookALevelInDumbass: He tends to let his overconfidence and arrogance get the best of him quite a few times.
* TookALevelInJerkass: Towards season three, he becomes more irritable and hostile towards his friends, probably due to all those years of insults and them being uncooperative particularly in Carl Wheezer Boy Genius and The N Men.
* TVGenius: He is a teenage boy genius who is not only excessively prone to TechnoBabble and SesquipedalianLoquaciousness, but has invented time travel, faster-than-light warp engines, and the best candy in the history of all existence and everything.
* VocalEvolution: In the pilot, the shorts and the movie, you'll notice that his voice was more nasally, scratchy and high pitched to match his {{Adorkable}} personality and sounded a lot more like [[WesternAnimation/TheGrimAdventuresOfBillyAndMandy Nergal Junior]]. Now his voice is more deep and clear.
* YankTheDogsChain: One of Jimmy's signature flaws. When some of his inventions start off good, then backfire on him right afterwards.

[[folder:Carl Wheezer]]
->Voiced by: Creator/RobPaulsen, Creator/WallyWingert (Jimmy Neutron Boy Genius console game)

-->'''Full Name''': Carlton Ulysses Wheezer

Jimmy's shy, asthmatic best friend who has an unhealthy obsession with llamas and Jimmy's mom.
* BigEater: You'd think having so many allergies would limit this, but no. Carl can chow down with the best of 'em and has a stomach of steel. Occasionally overlaps with ExtremeOmnivore for laughs:
-->'''Sheen:''' Carl, you're supposed to play with your toys, not eat them.
-->'''Carl:''' I know. But they always look so chewy and colorful.
* BringMyBrownPants: Carl has a tendency to soil himself.
--> '''Carl''': Mrs. Neutron, may I use your restroom? Because I really have to...never mind.
* ButtMonkey: He's the Guinea pig to all of Jimmy's experiments.
* CharacterizationMarchesOn: He eventually goes from being Jimmy's shy, asthmatic and introverted best friend to a more whiny and childish person.
* CowardlySidekick: To Jimmy.
* CatchPhrase: [[OwMyBodyPart "My scapula..."]]
* ExtremeOmnivore: He eats newspapers and toys.
* {{Fartillery}}: Gets this in "The N-Men" (see {{Gasshole}} below).
* FatBestFriend: Generally a straight mixture of a Type C (though not as big of a {{Cloudcuckoolander}} as Sheen) and a Type B (being shy). Which one dominates depends on the episode.
* {{Gasshole}}: He has burped more than anyone else on the show (except for Jimmy's dad). In "The N-Men", he gets hit by some cosmic radiation that turns him into "Belch Boy", allowing him to unleash [[MakeMeWannaShout sonic blast]] burps by drinking seltzer or shaking himself really hard.
* GreenEyedMonster: It is shown in "I Dream of Jimmy" and "Carl Wheezer, Boy Genius" that [[IJustWantToBeYou he'd really like to have Jimmy's life.]]
* HollywoodToneDeaf: His most attempts at singing something.
* {{Hypocrite}}: Out of the entire trio he is the one most outspoken about how boys should not take interest in girls even though he has hots for them just as often as Jimmy and Sheen do.
* ItRunsInTheFamily: His allergies. Turns out his mother and father have various allergies too.
* InnocentlyInsensitive: Carl tries to give Jimmy a pep talk, but only says something that makes him upset.
* JerkassBall: Carl takes it in "Carl Wheezer, Boy Genius", which starts out as a standard "I lied to my pen pal" farce, then quickly escalates as we learn Carl lied about having ''Jimmy's'' life. It goes downhill as Carl not only has to masquerade as a boy genius, but he forces Jimmy to be his lowly assistant. Then Carl starts milking the moment by blaming him for everything. Even by the end, when Jimmy has saved his life at least three times, Carl is ''still'' blaming him and projecting his own insecurities onto Jimmy to boot.
* LikesOlderWomen: Carl has a crush on Jimmy's mom since ''Love Potion #976-J''. He's also attracted to the class's teacher, Miss Fowl, who's in her fifties. At ''least''.
* LooseLips: Sheen helps him a lot with this one. They're often the ones to reveal the secret plan to the enemy, generally via SuspiciouslySpecificDenial.
* MinorInjuryOverreaction: Even the smallest tap on any part of his body will cause him great physical pain. He pretty much inherits this from the rest of his family as well.
* NerdGlasses: Wears a pair of big glasses.
* NerdsAreInnocent: He's a nerdy boy who's shy, sensitive, and often serves (or at least tries to) as the moral compass in his group of friends.
* NerdyInhaler: Carl uses an inhaler very frequently and is also allergic to almost everything.
* NeverMyFault: He gives this treatment to Jimmy in "Attack of the Twonkies" and "Carl Wheezer: Boy Genius".
* OwMyBodyPart: He seems to have a really tender scapula.
* PrecociousCrush: On Jimmy's mom.
* ShrinkingViolet: He's generally shy and nervous, at least before his Flanderization.
* SensitiveGuyAndManlyMan: The shy, cowardly Sensitive Guy to Sheen's superhero obsessed Manly Man.
* SicklyNeuroticGeek: What else can you expect with a surname like 'Wheezer'?
* StalkerWithACrush: To Jimmy's mom.
* VoiceChangeling: In The Incredible Shrinking Town, It was said he could do this from a ventriloquism lesson. The result was awesome. He was capable of impersonating Cindy's Mom's and Zix's voice perfectly.
* VocalEvolution: In the pilot, shorts, movie and early episodes, his voice was more deep, nasally and melancholy.
* WithFriendsLikeThese: He and Sheen can act like this way towards Jimmy by laughing with Cindy & Libby when they bully Jimmy and the one time when Jimmy told him and Sheen not to tell the other kids about his weather invention going haywire, but they told the kids anyway, causing the kids to be (albeit understandably) angry with Jimmy. Jimmy has, however, used Carl countless time as a guinea pig for his invention, so it pretty much balances out.
* YouthfulFreckles: Has many freckles that match his red hair.

[[folder:Sheen Estevez]]
->Voiced by: Jeff Garcia

One of Jimmy's best friends who is obsessed with the comic book superhero Ultra Lord.
* AccentAdaptation: In the Latin American dub, he speaks with a Japanese accent, possibly because the translators thought that he's Japanese-American, instead of Hispanic, and his name should be pronounced "Shin". Funnily enough though, Sheen ''was'' supposed to be Japanese, but since nobody could do anything Japanese sounding, Jeff Garcia came in and he was made Mexican.
* AttentionDeficitOohShiny: More or less made explicit in "Sheen's Brain", wherein his ability to learn is limited by his concentration difficulties and hyperactive demeanor. This is what basically dooms his chances to pass the test that'll secure him staying in fourth grade, prompting Jimmy to fix it scientifically (temporarily).
* BadassBoast: In ''Sheen's Brain''.
-->I control the wind, and I shall rain fire down from the heavens! Goodbye Sheen the overlord. [[AGodAmI Hello Sheen the God!]]
* BerserkButton: Do NOT call Ultra-Lord a doll. Or mock Ultra-Lord in any way. And definitely don't mess with his precious Libby.
--> '''Sheen''': [to Jimmy, Cindy and Libby] [[ComicallyMissingThePoint Guys, what're you so worried about? Ultra Lord's going to be here any minute]].
--> '''Cindy''': Ultra Lord's not coming you ding-dong! The Yolkians lied to you!
--> '''Sheen''': [gasps] WHAT?! Then they have awakened the wrath of Sheen! What're your orders Jimmy?!
* BetaCouple: With his sweet princess, Libby.
* BewareTheSillyOnes: He actually cares about Libby more than Ultra Lord and was more than willing to fight Yoo-Yee to get her back.
* ButtMonkey: He suffers a fair amount of physical abuse. He is also sometimes used to test Jimmy's experiments, but he actually enjoys this.
* CharacterExaggeration: Some people may not know this, but in the movie, he was fairly intelligent and less hyperactive. In season three, he's more loud and ignorant. In ''WesternAnimation/PlanetSheen'', all of his serious traits are totally erased; changing him from his nerdy and hyperactive self to an obnoxious prick.
* {{Cloudcuckoolander}}: In a minor but interesting play off of the idiot sidekick shtick. Sheen isn't exactly stupid (at least before Flanderization set in); he's just very, very scatterbrained.
* TheDitz: His IQ is 32.
* DrunkWithPower: When his intelligence is increased in ''Sheen's Brain''.
* EarlyInstallmentWeirdness: He mentions a sister in "I Dream of Jimmy" but WordOfGod has said since to disregard it. Canonically, Sheen is an only child who lives with his father and grandmother (at least until ''WesternAnimation/PlanetSheen'').
* ExtravertedNerd: An eccentric comic book-loving nerd.
* TheFriendNobodyLikes: Sheen constantly annoys everyone with his ramblings about Ultra Lord, low intelligence, annoying shouting and the fact that he can be insensitive.
--> '''Sheen''': Hey Robot! If the Junkman turns your parents into gravadiscs, can I have one?
--> '''Jimmy''': Sheen!
--> '''Sheen''': But they look so cool.
--> '''Robot''': [to Carl] I don't like Sheen.
--> '''Carl''': Tell me about it.
* GeniusDitz: He wrote the entire Ultra Lord website, which claims that he's the father of our country.
* GoofyPrintUnderwear: Limited Edition Ultra Lord Underwear! Only available in Japan!
* HollywoodToneDeaf: His singing is so bad, it actually puts the music-hating Twonkies to sleep.
* InnocentlyInsensitive: Thanks to his short attention span and low intelligence, Sheen tends to say very insensitive things to Jimmy and Carl.
* JerkassBall:
** In "Sheen's Brain", he becomes arrogant and rude towards everyone after becoming a genius and that's before he gains telekinetic powers, plots to plunge all of Retroville into darkness and sadistically tortures Jimmy and Carl. When he brutally strikes them with a lightning bolt, he realizes his new powers have turned him into a monster and decides to go back to his normal self.
** In "Jimmy for President", he blackmails Carl with an embarrassing photo from Ike's birthday party if he doesn't vote for him. When Sheen's plot is exposed, he is disqualified from the election.
** Sheen is often insensitive to people's feelings, though it alternates between his being too scatterbrained to pick up on emotional ques or too thick-skinned to take much note of them.
* {{Keet}}: He's very energetic.
* LoonyFan: He's obsessed with cartoon superhero Ultra Lord.
* MetaGuy: A RunningGag in the later seasons has him predict that an adventure is imminent before any of the other characters even get to that point (so much so that him saying [[SharePhrase "to the lab!"]] early becomes kind of a catchphrase). In ''Stranded,'' for example, he can tell it just from the fact that Jimmy and Cindy are arguing:
--> '''Sheen:''' "Just a little longer, Carl. Our adventure should start at any minute."
--> '''Carl:''' "What adventure?"
--> '''Sheen:''' "You'll see..."
* MissingMom: According to [[WordOfGod the creators]], [[TearJerker she died when Sheen was too young to remember her]].
* NoIndoorVoice: Especially in season three.
* PluckyComicRelief: He serves as the funny sidekick on the show.
* PuppyLove: With Libby.
* RedOniBlueOni: The red to Nick's blue.
* SensitiveGuyAndManlyMan: The superhero obsessed Manly Man to Carl's shy, cowardly Sensitive Guy.
* TheSlacker: Watches Ultra-Lord while trying to do his homework.
* WideEyedIdealist: He believed that there was goodness in Tee and was proven right.
* WithFriendsLikeThese: He and Carl can act like this way towards Jimmy by laughing with Cindy & Libby when they bully Jimmy and the one time when Jimmy told him and Carl not to tell the other kids about his weather invention going haywire, but they told the kids anyway, causing the kids to be (albeit understandably) angry with Jimmy.
* WithGreatPowerComesGreatInsanity: When he becomes a genius, he gains telekinetic and psychic powers and plots to destroy all of Retroville. Not to mention he nearly kills Jimmy and Carl.

[[folder:Cindy Vortex]]
->Voiced by: Carolyn Lawrence

-->'''Real name''': Cynthia Aurora Vortex

Jimmy's rival and female counterpart, who has a crush on him. Not that she'll admit it.
* AbusiveParents:
** Hinted at throughout the show, although the full picture is mostly ambiguous. While it's certain that Mrs. Vortex is a rather strict parent (not much is known about her husband, him being TheVoiceless and all) who probably played the key role in developing Cindy's vast ambitions as well as had her enroll in an overwhelming number of extracurricular activities, she genuinely cares for her daughter and supports her at every turn, most notably shown in "Win, Loose, Kaboom" where she is [[MamaBear the first to suggest that the Retroville parents start working on helping their children instead of just standing and watching]].
** Both [[WesternAnimation/JimmyNeutronBoyGenius the movie]] and [[VideoGame/JimmyNeutronBoyGenius its video game adaptation]] confirm that the Vortex family members genuinely love each other.
* AcademicAlphaBitch: She lost her reputation as the smartest kid at her old school when she moved into the house across the street from Jimmy, whereupon Cindy, now second runner up, began a rivalry with him.
* AcademicAthlete: The smartest student after Jimmy and knows karate enough to kick asses.
* ActionGirl: Cindy practices karate.
* {{Adorkable}}: Particularly in the movie when she's explaining to Libby how she is mixing ta chi with purple flurp.
* BadassBookworm: Other than being a genius, Cindy is more athletic than Jimmy and practices a lot of martial arts sports.
* BadLiar: Cindy is the worst liar in the world.
* BareYourMidriff: As Special Girl.
* BelligerentSexualTension: With Jimmy.
* CannotSpitItOut: Cindy's extremely cautious when it comes to saying things she might regret afterwards so she usually avoids it when she can. And when she knows she should apologize to Jimmy or otherwise acknowledge his intellect or skill, it's bound to come out after a prolonged period of awkward silence or "Neutron, I hate to say it but...". Obviously applies to revealing her true feelings about him as well.
* ClingyJealousGirl: She doesn't like seeing Jimmy showing any interest in other girls, most notably Betty.
* TheCorruptible: She tends to get easily flattered by the villains into helping them.
* DeadpanSnarker: She's often prone to sassy remarks.
** For example "Beach Party Mummy" has this exchange:
-->'''Jimmy''': I don't understand it. I can't seem to find the lost tomb!\\
'''Cindy''': Duh! That's why they call it the "''lost'' tomb", not the "here it is tomb, come inside and have a milkshake"!
* DefrostingIceQueen: Towards Jimmy over the course of the show, as her affection towards him becomes more evident.
* DistaffCounterpart: To Jimmy.
* {{Expy}}: Of [[WesternAnimation/HeyArnold Helga Pataki]]. Both of these tomboyish blonde lasses each harbor crushes on the main protagonist but act villainous and bully them whenever they're present, to hide it.
* {{Flanderization}}: In the movie, she was revealed to be a lot kinder than she seemed and she and Jimmy got along better as result by films end. In the series, she's become more stubborn and she and Jimmy fight more. In the cancelled season four, Cindy would've been de-Flanderized, since she and Jimmy would become official.
* GirlishPigtails: In the movie and shorts before trading it to a ponytail.
* GoofyPrintUnderwear: Polka dot panties.
* GreenEyedMonster:
** She was the smartest kid in her old school until she moved into town and met Jimmy.
** It is also shown that she feels inferior to Betty Quinlan, and not just because Jimmy likes her. This would've been further explored in Season 4.
** In "Beach Party Mummy", she suspiciously asks "What's going on?" when Jimmy [[HoldingHands holds Libby's hand]] (after he figures out that she can trick the mummies into sparing them due to being a descendant of a female Pharaoh).
* HintDropping: Unfortunately, Jimmy seems to permanently be holding the IdiotBall when it comes to interpersonal relations.
* HypnotizeThePrincess: Gets hit with this in the Halloween special, courtesy of Vampire!Carl.
* IdiotBall: Whenever the villains try to manipulate her into helping them with false flattery.
* IJustWantToBeSpecial: She actually admires Jimmy, is very fond of him and secretly wants to be as brilliant and smart as him. Also counts as InferioritySuperiorityComplex.
* ItsAllMyFault: In "The N Men", when she realizes that her mistreatment towards Jimmy has turned him into a hulking jerk monster.
* JerkassFacade: She's spoiled, stubborn, arrogant and bossy, but uses them to cover up her insecurities.
* JerkWithAHeartOfGold:
** She's bossy, spoiled, stubborn and arrogant, but underneath all that, she is a genuinely good person, but doesn't want anyone to know that.
** She is deeply infatuated with Jimmy, looks up to him and wants to be as brilliant as him. This is pretty much the main reason why she always tries to poke fun at him or otherwise make him angry. [[BelligerentSexualTension Works both ways]].
** She enjoys taking care of pets, plants and little babies.
** She doesn't like it when Jimmy is emotionally crushed, heartbroken or depressed and usually goes to comfort him.
* KungFuKid: Cindy practices karate. She goes to competitions, is sometimes seen in her gi, and although we're never told what level she's at, based on some of her flips, she's probably a black belt.
* LaserGuidedKarma: In the ChristmasEpisode "Holly Jolly Jimmy", she and Libby get coal for Christmas as punishment for turning Retroville against Jimmy after he accidentally ruins Christmas by scrambling Santa's atoms. It helps that Jimmy did his best to fix his mistake and that Cindy and Libby kept on ragging on Jimmy even after he apologized for his blunt arguments that Santa doesn't exist.
* LastNameBasis: Even though she uses Jimmy's first name plenty of times, she often calls him by his last name (or the "Nerdtron" nickname she came up with) and even when she warms up to him towards the end of the show, it's not usual to hear a "Jimmy" coming out of her mouth, possibly because old habits die hard or possibly because he's gotten a bit more irritable around her. In all fairness, Jimmy himself does call Cindy "Vortex" every once in a while, mainly when he's annoyed.
* LaughOfLove: She sometimes laughs when she's having romantic moments with Jimmy, most notably in the episodes "Love Potion 976/J" and "Stranded".
* LittleMissSnarker: In "Trading Faces":
-->'''Jimmy in Cindy's body''': Don't give Cindy my astounding ability to create and build pioneering technologies, okay?\\
'''Cindy in Jimmy's body''': Oh yeah, like I'd want to invent toilet in a briefcase!
* LovingBully: She picks on Jimmy but she only does this to mask her love for him.
* NeverMyFault: She gives this treatment to her friends when she causes the problem. Particularly in "Vanishing Act".
* NiceJobBreakingItHero:
** In "The Egg-Pire Strikes Back" she tells King Goobot how to get inside Jimmy's lab after learning it from Carl and Sheen. Partly subverted since for all she knows they just want to help her in being able to compete with Jimmy on an equal footing by means of building a lab of her own, though she is dumb enough to trust the Yolkians (and so is everybody else in town, except Jimmy). When she realizes that her actions put the whole Retroville in danger, she is the first to call on the others to believe Jimmy and help him bring down Poultra.
** "The N Men" has her acting uncharacteristically harsh to Jimmy and she refuses to listen to his warnings about misusing her powers. Fed up with Cindy's nasty attitude and how she treated him, Jimmy transforms into a hulking jerk monster. When she sees that the army is after him, she realizes that this is all her fault and decides to make amends by helping him. Later as she's falling unconcious, she gets down on her knees and apologizes to Jimmy for hurting his feelings and attempts to tell him how she really feels, changing Jimmy back to normal.
** "Vanishing Act" has her resentment towards Betty going critical and she causes Jimmy's magic box to overload and send herself, Betty, Carl, Jimmy and Sheen into some strange world.
** "King of Mars" has her defecting from the gang to join Eustace. Again, subverted because the only reason why she does it (and the very argument Eustace uses to convince her) is to make Jimmy finally take notice of her, even though she was TooDumbToLive. That is also why she is EasilyForgiven later on.
* NotSoDifferent:
** She constantly makes fun of Jimmy being super smart, when in fact, she is a genius just like him, but not as big a genius as him.
** Also, while her {{Alpha Bitch}}y demeanor would suggest otherwise, she and Jimmy are both TheFriendNobodyLikes and the townsfolk even consider her just as much a nuisance as Jimmy.
* NiceMeanAndInBetween: The mean one with Libby and Brittany.
* OutOfCharacterMoment: In the ''WesternAnimation/FairlyOddParents'' crossover trilogy, she acts totally unrealistic and airheaded when Timmy is around and is blind to all of his lies and [[InsaneTrollLogic she even makes stupid assumptions]]. She doesn't even care that Jimmy and Timmy were practically killing themselves because of her.
* PinkMeansFeminine: Wears pink sneakers and, as seen in the first episode, [[PantyShot light-pink panties]]. Also wore a pink shirt in the shorts and movie. She also decorates her room pink.
* {{Pride}}: Like Jimmy, this is one of her trademark flaws. She pretends to dislike Jimmy so people won't laugh at her and doesn't even admit why she resents Betty.
* PuppyLove: With Jimmy.
* RichBitch: She's rich and is rather greedy when it comes to diamonds and jewels.
* TheRival: To Jimmy.
* RivalryAsCourtship: Jimmy and Cindy each have their own respective crushes in the beginning of the series (Betty and April for Jimmy, and Nick Dean and Timmy Turner for Cindy) while nursing their own rivalry with each other. By the end of the series, though, it's clear [[OfficialCouple where their relationship stands.]]
* SlapSlapKiss: With Jimmy.
* SpoiledBrat: Kind of like [[WesternAnimation/TheLandBeforeTime Cera]] as a human.
* TomboyAndGirlyGirl: The Tomboy to Libby's Girly Girl.
* TomboyishPonytail: In the TV series.
* TrueCompanions: With Libby and Brittany.
* {{Tsundere}}: Type A, obviously. In the movie she explains that she only became one to Jimmy, because she was jealous of his better grades and she hates his tendency to show off his intelligence on every given occasion.
* WomenAreWiser: Every once in a while, especially seeing as Jimmy tends to lose the sight of the bigger picture and waste time using his inventions even when simpler means would suffice. However, since she's at least just as stubborn as Jimmy, her taking the helm doesn't always prove to be the best idea either.
* YankTheDogsChain:
** In "The Science Fair Affair", she loses the trophy even after she helped save the day.
** In "Win, Lose and Kaboom", April ruins her and Jimmy's big chance to kiss.
** In "Attack of the Twonkies", after Jimmy and Sheen save the town, Sheen steals her spot in the school chorus.

[[folder:Libby Folfax]]
->Voiced by: Crystal Scales, Carolyn Lawrence (Jimmy Neutron Vs. Jimmy Negatron)

-->'''Real name''': Liberty Danielle Folfax

Cindy's best friend and Sheen's girlfriend. The love of Libby's life? Music, the funkier the better. And she doesn't just listen, she also plays the keyboard, DJ's, and can throw a high note that would give most opera singers a run for their money.
* BetaBitch: She plays this role to her best friend Cindy.
* BetaCouple: With Sheen.
* BigSisterMentor: Libby serves as a big sister to Jimmy and is always trying to get him to come out of his shell.
* BlackBestFriend: To Cindy.
* CannotTellALie: Which usually makes it hard for her to keep secrets or for her to go with Jimmy's brilliant plans. However, Libby [[OutOfCharacterMoment does lie]] in "Jimmy for President" and "Attack of the Twonkies". Naturally, her friends are shocked by this.
* CharacterDevelopment: Libby used to be more of a sidekick to Cindy, but she soon enough became more distinct and evolved into the group's DeadpanSnarker and [[OnlySaneMan most sensible and levelheaded member]].
* CheatersNeverProsper: In "Jimmy for President", she tries to buy Carl's vote and even lies to him. At the end, Libby (along with Jimmy and Sheen) is disqualified from the election as a result.
* DeadpanSnarker:
-->'''Sheen''': Don't worry, Libby. When I'm elected, you can still be my First Lady.
-->'''Libby:''' Get a life, Sheen.
* {{Gasshole}}: Becomes one after eating the Belch Boy packet in "The League of Villains", even to the point of making a ''dance'' out of her burps.
* GiveGeeksAChance: Both in telling Cindy to be honest with Jimmy and her own involvement with Sheen.
* ImportantHaircut: Libby gets one in the ''Beach Party Mummy'' episode to fool a bunch of mummies that were chasing the gang. She keeps the new look for the remainder of the series.
* IncrediblyLongNote: Turns this into a ChekhovsGun in "The Great Egg Heist."
* {{Invisibility}}: She gained this power along with ability to [[BarrierWarrior generate force fields]] in "The N-Men" episode.
* NiceMeanAndInBetween: The in-between one with Cindy and Brittany.
* NotSoAboveItAll:
** Just like Cindy does with her feelings for Jimmy, Libby sometimes denies her feelings for Sheen.
** Sometimes, she is shown to like Ultra Lord as well.
** When she gets her music taken from her, she starts sobbing like a baby.
* OOCIsSeriousBusiness: Whenever she lies.
* OnlySaneWoman: She's the most levelheaded character in the series (along with Judy).
* PinkMeansFeminine: Her new design includes a pink long-sleeved shirt.
* PromotedToOpeningCredits: Libby is in the title lineup at the end of the opening credits of season three.
* PuppyLove: With Sheen.
* SassyBlackWoman: She's Cindy's sassy BlackBestFriend.
* ShipperOnDeck: She's FOREVER pleading with Cindy to just tell Jimmy how she feels and get it over with! Can you blame her?
* TokenMinority: The only black girl in her group of friends.
* TomboyAndGirlyGirl: The Girly fashionista to Cindy's athletic Tomboy.
* TomboyWithAGirlyStreak: She adjusts really quickly to becoming "Burp Girl" in "The League of Villains", even proving better at using the sonic-blast burps than Carl did in "The N-Men". She's sassy, loves hip-hop and electronic gadgets, and wears jeans (as opposed to the movie, where she has more a GirlyGirl design), but she also likes fashion and has a pink shirt.
* TookALevelInJerkass: In "Lady Sings the News", she betrays her friends, exploits their secrets to the press and even blackmails people into waiting on her. Later, when she finds out the town is gonna kill Carl, she sees the error of her ways and apologizes to her friends.
* TrueCompanions: With Cindy and Brittany.
* WomenAreWiser: Compared to her boyfriend, Sheen.

->Voiced by: Creator/FrankWelker

Jimmy's robot dog and lab assistant.
* ABoyAndHisX: A Boy And His Robot Dog. Goddard is without a doubt, Jimmy's best friend and favorite invention.
* ADayInTheLimelight: Goddard is by all means a main character, but the only episode that gives him the focus is "Best in Show", one of the last ever aired.
* DoAnythingRobot: He does eleven billion and four things! Except clean up after himself.
* EatingMachine: There's several occasion where he also eats human foods like ice cream.
* JawDrop: He has this moment after seeing Jimmy dressed up for his date with Cindy. Being a robot, his jaw literally dropped.
* NonHumanSidekick: To Jimmy.
* RobotBuddy: Jimmy's mechanical canine and best friend.
* RobotDog: A robotic dog invented by Jimmy himself.
* SelfDestructMechanism: His "plays dead" command is this. Goddard can reassemble himself despite his core combustion. This ability is vital to defeat Eustace's [[PowerCopying Robo Adaptoy]].
* TheSpeechless: Except in the movie, where his options for Jimmy are read in a robotic voice.
* TeamPet: A robot dog, who happens to be the gangs mascot.

[[folder:Hugh Neutron]]
->Voiced by: Mark [=DeCarlo=]

--> '''Real names''': Hubert Beaumont Neutron

Jimmy's father. Averts Father Knows Best. Nevertheless, he's a chipper, upbeat family man who always has time to dispense words of wisdom for Jimmy, even if most of the time those words are better left ignored. Has an obsession with ducks.
* AdaptationalPersonalityChange: Hugh is very much like a normal, well-meaning, loving father in the movie. To give him more of a distinct personality, the series made him more bumbling and naive.
* AdultsAreUseless: Hugh is probably one of the biggest idiots in the city. In fact, he messes with Jimmy's inventions all the time.
* BumblingDad: Many times, Hugh would screw up one of Jimmy's inventions.
* {{Cloudcuckoolander}}: Quite possibly the largest one in the series.
* TheDitz: The typical dim-witted bumbling father.
* {{Gasshole}}: Even without drinking the Burping Soda, Hugh has burped more than anyone else in the series, including Carl.
* HappilyMarried: To Judy.
* IdiotBall: Holds it consistently, like it's his firstborn child.
* JerkassBall: Twice as a result of Jimmy's inventions.
** The first is when Jimmy altered the past so that his dad would invest his only money ($50) into then non-popular restaurant [=McSpankies=], to make his parents rich and allowing him to get an expensive set of encyclopedias that he wants. Unfortunately along with Judy, he becomes a snobby rich man with no interest in his son, forgetting his name and offering him some money to leave. He even refuses help pay for a lifesaving operation for his father merely because he does not want to lose any money.
** The second is when Jimmy uses a machine to turn him cool (and prevent him from embarrassing him at the Fathers Day performances at school). He becomes super popular with the town, but never wants to spend time with Jimmy or Judy anymore and plans to leave them to go on a World Tour as a popstar. He even initially ''refuses to save his son's life'' before his parental instincts finally kick in and revert him back to normal.
* TrademarkFavoriteFood: Pie.
* JumpOffABridgeRebuttal: Twisted.
--> '''Jimmy''': "Aw, but Dad! All my friends are going!"
--> '''Hugh:''' "Now, Son, [[IceCreamKoan if all your friends were named Cliff, would you jump off them?]]"
* ManChild: Probably the least intelligent person in Retroville, rivaling even Carl and Sheen. The guy's obsessed with ducks and pies, come up with childish theories and acts as if he is a ten year old. The only person who could rival his childishness is probably Timmy Turner's dad.
* NeverMyFault: He gives this treatment to Judy when he sends the town back in time using Jimmy's Wormhole Generator. She does call him out on this.
* NiceJobBreakingItHero: Sometimes he causes the episodes problem.
* ObliquelyObfuscatedOccupation: Eventually averted when we learn he's a car salesman.
* UglyGuyHotWife: With Judy.

[[folder:Judy Neutron]]
->Voiced by: Megan Cavanagh

Jimmy's mother. She's happy to cook and clean and run the household, but does want some appreciation for all she does. After all, without her, Jimmy and Hugh's lives fall to pieces.
* ADayInTheLimelight: In "Maternatron Knows Best".
* ActionMom: She's incredibly athletic, coordinated, intelligent, and she keeps a plasma rifle in her utility closet (for those tough ground-in stains!)
* BeautyMark: Has one near her mouth.
* DeadpanSnarker
-->'''Judy''': Hugh, are you aware that most of the things you say don't make any sense?
-->'''Hugh''': I know honey. I know.
* DitzyGenius: Not ditz per se (she's certainly the intelligent one in her marriage with Hugh and more rational than he is) but she has her moments of ditziness. There are also numerous moments where she demonstrates it's definitely from her side of the gene pool that Jimmy gained his intellect.
* FullNameUltimatum: "James Issac Neutron!"
* {{Gasshole}}: Becomes this after chugging some of Jimmy's Burping Soda.
* HappilyMarried: To Hugh.
* HypnotizeThePrincess: Ever noticed she gets hypnotized quite a bit on this show?
* MamaBear: "'''Get away from my family, you ugly bucket of bolts!'''"
* MundaneUtility: Use a de-molecular cannon beam to clean difficult stains.
* OnlySaneWoman: Along with Libby.
* StacysMom: Carl has a crush on her.
* TookALevelInJerkass: In season three, she's more hostile towards Jimmy.
* UglyGuyHotWife: With Hugh.
* WomenAreWiser: Compared to her bumbling husband.

!Supporting Characters

[[folder:Bolbi Stroganovsky]]
->Voiced by: Creator/PhilLaMarr

A foreign exchange student from the country of Backhairistan, he's a happy-go-lucky, friendly, well-meaning kid who's always there when his friends need him.
* BunnyEarsLawyer: As silly and strange as he is, he's an excellent actor.
* ButtMonkey: In "El Magnifico" he pays a slapstick-heavy price so that Mr. Estevez can pull of his superhero hoax in front of Sheen. Not that anyone asked him to.
* {{Cloudcuckoolander}}: He makes ''Sheen'' look sane by comparison.
* DanceSensation: The "Slap Dance" from his homeland. [[EarWorm "Slap slap slap! Clap clap clap! Slap slap slap! Clap clap clap!"]]
* TheDitz: Though he seems like just a goofy foreigner at first.
* FunnyForeigner: Kind of like [[Series/That70sShow Fez]] meets [[WesternAnimation/EdEddNEddy Rolf]]. The difference is that Bolbi's country is actually named ([[PunnyName Backhairistan]]).
* HiddenDepths: He's a very good actor and has monologues committed to memory.
* KilledOffScreen: [[ImpliedTrope Implied]]. His last on-screen appearance in the series was being chased by a rampaging monster unleashed by Professor Calamitus.
* {{Ruritania}}: His homeland of Backhairistan.
* StrongFamilyResemblance: His sister is just a slightly shorter version of him in blonde braids and make up.
* ThrowTheDogABone: In "Jimmy for President" and "Out Darn Spotlight".
* TrademarkFavoriteFood: Kebabs. They appear to be standard cuisine in his country.
* TookALevelInBadass: In "Win, Lose and Kaboom", he manages to help defeat Meldar's robots.
* VocalEvolution: Had a slightly deeper voice and heavier accent in his first appearance.

[[folder:Betty Quinlan]]
->Voiced by: Creator/KathSoucie

The girl of Jimmy's dreams, and sometimes the motivation for hi-jinks in his efforts to impress her. Cindy doesn't care for her... for ''some'' reason.
* ADayInTheLimelight: She's the main protagonist and focus of "Out Darn Spotlight" and "Vanishing Act".
* BareYourMidriff: When she played Lady Macbeth.
* BettyAndVeronica: Quite literally the sweet natured Betty to Cindy's Veronica. Ironically, Betty looks like Veronica and Cindy looks like Betty.
* BewareTheNiceOnes: In her later appearances, when we see that she has her limits.
* BeautyMark: Located under her right eye.
* DistaffCounterpart: To Nick.
* TheRival: Unintentionally to Cindy. Had the series continued, there would have been an episode that focused on them. In said episode, Cindy and Betty would've finally opened up to each other and the two would've become friends.
* SatelliteLoveInterest: Sort of. She's ''not'' oblivious to Jimmy's crush on her or Cindy's crush on Jimmy for that matter. It is also implied that while she might be flattered by Jimmy's affections, she knows he belongs with Cindy and is fully supportive of it.

[[folder:Ms. Fowl]]
->Voiced by: Andrea Martin

The cast's homeroom teacher.
* AnimalMotifs: Birds. Not just her name, but her appearance (long pointy nose, motioning her arms like wings, squawking, etc.).
* BunnyEarsLawyer: As odd as she is, she has proven many times to be a ReasonableAuthorityFigure.
* {{Cloudcuckoolander}}: Occasionally teaches subjects that really aren't pertinent to a fourth grade education ("And that's why cowboys are bow-legged" anyone?).
* DeathGlare: Unlike the other staff members at the school, she doesn't require a weapon to take down the unruly substitute teacher parents in "How To Sink A Sub". She uses her "skunk eye", which immediately intimidates people into backing down.
* DubNameChange: She is named "Señorita Ave" (Ms. Bird) in the Latin American dub.
* GagNose: Resembling a beak, taking her whole bird motif much further.
* KavorkaMan: A rare female example. She attracted Thomas Edison, went dancing with President Hoover, flirts with Sam and was once married to a werewolf.
* LastNameBasis: Being a teacher, everyone just calls her Ms. Fowl but in "Substitute Creature" General Ernest Abercrombie states her name is "Winifred".
* MeaningfulName: Fowl is another term for bird, in which fits her AnimalMotifs. Her latin american name, "Señorita Ave", is more literal. (It means Ms.Bird).
* NoodleIncident: She was once married to a werewolf. She refers to it as "a story for another day".
* SternTeacher: She has her moments.
* VagueAge: Okay, she's old. But ''how'' old is she?
** In one episode, she implies that 58 is ''young'' for her.
** In "Make Room for Daddy-O", she mentions that it is the 82nd annual Father's Day Follies and states that she still remembers the first one like it was yesterday.
** Lampshaded in "Attack of the Twonkies".
--> '''Sheen''': She is getting on in years, but I'm sure she's not a thousand.
* VerbalTic: Tends to end sentences with a squawk-like noise.

[[folder:Nick Dean]]
->Voiced by: Creator/CandiMilo

Another one of Jimmy's friends, who is the cool guy that everybody loves at school, especially the girls.
* AdaptationalNiceGuy: He's much nicer and fleshed out than he was in the movie.
* AdaptationalWimp: In the movie, Jimmy takes backseat as Nick leads the charge against the Yolkians, and the class BadButt even manages to take out a couple of Yolkian guards by hijacking one of their spears... only to lose momentum upon seeing the giant alien-chicken, at which point he becomes completely useless and Jimmy has to lead the charge himself. Nick's later PaperTiger characterization suggests he would balk at even taking on the guards, if he had to do it again.
* AllGirlsWantBadBoys: Which is why all the girls at his school dig him.
* AttentionWhore: He'll do anything for love and attention.
* BadButt: Before his later characterization took hold.
* BigBrotherMentor: Nick's like a big brother to Jimmy and often gives him advice to help him out when he's in a jam (even though Jimmy ends up in trouble because of it).
* BigManOnCampus: The coolest guy in Jimmy's class.
* BookDumb: He never got a 95 in his life.
* BreakTheHaughty: In "The League of Villains", it is implied he now hates himself.
* TheChewToy: All of his appearances in season three consist of him breaking his leg while skateboarding. Jimmy lampshades this during one of his news segments in "Lady Sings the News."
* TheCharmer: Thanks to his AllGirlsWantBadBoys charm.
* ChickMagnet: All the girls find him attractive.
* DeadpanSnarker
-->'''Sheen:''' Libby's right. We can't give up hope. We need to ask ourselves what Ultra Lord would do.
-->'''Nick''': That's actually a good question, Sheen. Maybe he'll just sit on the shelf because he's a doll!
-->'''Sheen:''' He's not a doll! He's an action figure!
* DemotedToExtra: He used to be an important character, but in the last two seasons, he barely shows up at all except to break his leg skateboarding. Had the series continued, Nick would've rejoined the main cast and continued to develop his relationships with Jimmy and the gang.
* EvenBadMenLoveTheirMamas: He is a bit of a mama's boy.
* GratuitousGerman: He sang a lullaby in German to his twonkie, and knowing how twonkies respond to song, it's expected what happened to him.
* HiddenDepths: He only acts like a tough guy because he's insecure and afraid.
* JerkWithAHeartOfGold: Nick may be cynical, egotistical and snarky, but he's also one of Jimmy's best friends and he's actually a really good person.
* LovableJock: One of Jimmy's best friends and the most athletic one (next to Cindy).
* MeaningfulName: His last name is a reference to James Dean who is best known for playing similar "bad boy" roles.
%%* MommasBoy: See above.
%%* MrFanservice: Why else would the chicks love him?
%%* NobleMaleRoguishMale: Roguish to Jimmy’s Noble
* OddFriendship: He and Jimmy have a strong bond and get along well.
* PaperTiger: He's the ultimate cool dude, the girls all dig him, and he's supposed to be tough. In the movie, his part of the plan is to take care of the BigBad while the others rescue their parents. One look at his competition, though, and he goes screaming like a little girl.
* PrettyBoy: Which is why all the girls love him.
* RedOniBlueOni: The blue to Sheen's red.
* SavvyGuyEnergeticGirl: The savvy guy to Brittany's energetic girl.
* ScreamsLikeALittleGirl: Whenever something frightens him, especially once he first saw Poultra's eyes.
* SensitiveGuyAndManlyMan: The manly man to Jimmy's sensitive guy.
* TroubledButCute: A supposed tough kid who is considered cool and is popular with girls.

[[folder:Brittany Tenelli]]
->Voiced by Creator/CandiMilo

Cindy's other best friend, who is often seen hanging out with her and Libby as a third member of Cindy's friend circle.
* {{Adorkable}}: She's clumsy, naive, innocent, downright adorable and as sweet as a jellybean. Especially when Nick's around.
* AgeInappropriateDress: The elementary school sure has a [[NoDressCode lousy dress code]] for letting her wear shirts that show off her belly button.
* AscendedExtra: Would've become one in season four.
* BareYourMidriff: She wears a pink and white midriff shirt.
* BookDumb: In "Raise of the Oozy Scab", Brittany is revealed to be illiterate.
* CloudCuckooLander: She's a comic foil to the otherwise brainy Cindy and Libby.
* CuteClumsyGirl: Pretty as she may be, she is kind of a klutz.
* TheDitz: Of Cindy's circle of friends.
%%* DoggedNiceGirl: To ''some'' extent, maybe Jimmy.
* DumbBlonde: Like a miniature [[ComicBook/JosieAndThePussycats Melody Valentine]].
* TheFriendNobodyLikes: Cindy and Libby often treat her like this.
* GeniusDitz: She may be doofy, but she's also an awesome dancer.
* GenkiGirl: You can hear a lot of [[WesternAnimation/MayaAndMiguel Maya Santos]] in her.
* GirlishPigtails: She wears her hair in two pigtails, like Cindy did in the movie and shorts.
* HairOfGoldHeartOfGold: One of the nicest characters in the series.
* KindheartedSimpleton: She's a ditz, but is the kindest character on the show.
* MoralityPet: To Nick.
* NeverLearnedToRead: Which she sometimes denies.
* NiceGirl: One of the few characters who doesn't antagonize Jimmy in any way and she actually seems to admire him.
* NiceMeanAndInBetween: The nice one with Cindy and Libby.
* NoCelebritiesWereHarmed: [[Music/BritneySpears "Um, I didn't do it!"]]
* SavvyGuyEnergeticGirl: The energetic girl to Nick's savvy guy.
* SimpletonVoice: Candi Milo at her best.
* TrueCompanions: With Cindy and Libby.

->Voiced by: Creator/BillyWest

Owner of the local hangout joint, The Candy Bar.
* BullyingADragon: Does so in the superhero episode the N-Men. Jimmy is a [[IncredibleHulk rampaging orange monster]] but upon seeing his parents, he starts calming down. Until Sam [[TooDumbToLive decides to throw fruit]] in Hulk/Jimmy's face. Needless to say, the mutated Jimmy doesn't take too kindly to it. This also came up in the HalloweenEpisode, though he had an angry mob to back him up.
* DeadpanSnarker: One particular instant is in "Krunch Time", when he sarcastically remarks the suspense is killing him when Carl is unable to decide what kind of candy he wants.
* {{Jerkass}}: N-Men episode again. [[JerkassHasAPoint He was right that something should have been done to try to help the kids control their new found powers.]] However, calling the military up to ''imprison'' them and then telling the kid's parents they were just ''freaks'' was beyond the pale.
* ShipTease: Sometimes has these with Ms. Fowl.
* UngratefulBastard: He even says that Jimmy still owes him $1.80 for the heavy seltzer, even after the N-Men thank him for his help.
* VerbalTic: Has a habit of ending his sentences with, "Yeah!".

[[folder:King Goobot the Fifth]]
->Voiced by: Creator/PatrickStewart (movie), S. Scott Bullock (TV series), Joe Whyte (video game)

King of the Yokians, and Jimmy's first archenemy.
* ArchEnemy: To Jimmy.
* BigBad: He is the main villain in the movie.
* GreaterScopeVillain: Of the PC Jimmy Neutron game.
* LegionOfDoom: He created "The League of Villains" consisting of several villains from numerous episodes including some of the Rogue Galleries.
* TaughtByExperience: Goobot learned from past experiences that Goddard, Jimmy's inventions and friends were things that foiled his plans so he cut down Jimmy's access to them before catching him in the series finale.
* TrappedInThePast: What becomes his ultimate fate in the series finale.

->Voiced by: Martin Short (movie), Paul Greenberg (TV series), Mark [=DeCarlo=] (video game)

King Goobot's less than competent assistant.
* AffablyEvil: He's unfailingly polite even when he helps Goobot with his wicked whims.
* {{Cloudcuckoolander}}: He's not too bright.
* MinionWithAnFInEvil: Though he does come close to killing Goddard in the movie and mentions that he likes seeing people being [[ThrownOutTheAirlock spaced]].
* PutOnABus: Goobot apparently traded him for sulfur butter prior to "League of Villains".

[[folder:Yokian Fleet Commander]]
->Voiced by: Creator/RobPaulsen

An important asset of King Goobot's forces and leader of the king's fleet.
* CanonForeigner: He is made for the PC Jimmy Neutron game.
* CreepyMonotone: His voice is full of this.
* DarthVaderClone: His shell is mostly black and an important figure for the true main villain. In fact, he even QUOTED Darth Vader.
* DragonWithAnAgenda: He is just after Jimmy Neutron, rather than human life compared to his superior.
* KarmaHoudini: [[spoiler:He let Jimmy and his friends go, without punishment.]]
* NoNameGiven: His name is yet to be revealed.
* RedAndBlackAndEvilAllOver: His black shell, red eyes and cape signify this.
* RejectedApology: [[spoiler:He rejected his lieutenant's apology for not finding Jimmy before destroying his shell.]]
* SeekerArchetype: A villainous example, where he longs to find Jimmy Neutron.
* SuddenlyShouting: "Bring me that human boy, NOW!"
* VerbalTic: "Human boy."
* WeWillMeetAgain: [[spoiler:His last words before he lets Jimmy and his friends leave.]]
* YouHaveFailedMe: Said word-for-word after he got angry [[spoiler: at his lieutenant.]]


The Yokians' "god[[AmbiguousGender (ess)]]", a gigantic chicken monster.
* AmbiguousGender: In the film, he's referred to as male and a "god", but in "Return of the Yolkians", she's referred to by female pronouns. This ''may'' be justified because the Poultra who appeared in "Return of the Yolkians" wasn't the same one as the original, but the episode words it in a way that suggests that Poultra has ''always'' been female.
* BackFromTheDead: Possible subversion--she was killed in the movie, but in the TV special "Return of the Yolkians" she's brought back. The reason it's possibly a subversion is because she's more or less cloned back to life and Jimmy implies that the cloned Poultra isn't the same as the original one.
* FeatheredFiend: A giant killer chicken.
* ShoutOut: Her second death is a shout out to [[https://en.wikipedia.org/wiki/Wawel_Dragon the Wawel Dragon]], of all things.

[[folder:Professor Finbarr Calamitous]]
->Voiced by: Creator/TimCurry

Jimmy's other arch-nemesis and the show's main antagonist.
* AbsentMindedProfessor: Calamitous when introduced was never able to finish anything, even his own sentences. From his second appearance onwards, he can now talk in complete sentences thanks to self-help classes. However, this habit appears again in "The League of Villains".
* AffablyEvil: Sure, he's got evil scheme after evil scheme, but he's still a pretty friendly guy.
* ArchEnemy: Seems to have taken this role up from King Goobot, as he's one of Jimmy's most recurring enemies.
* BewareTheSillyOnes: Even before he took self-help classes to help him finish things, he was still as threatening as he was forgetful in his first appearance.
-->'''Jimmy:''' "For a bumbling genius, he's pretty dangerous."
* BigBad: Expect him to fall into this role a lot, especially during crossovers.
* DopeSlap: Often gets these from his daughter.
* EvilCounterpart: To Jimmy, although he's much older.
* InTheirOwnImage: After being fused with [[WesternAnimation/TheFairlyOddParents Jorgen von Strangle]], he intended to recreate all reality as he saw fit.
* LoopholeAbuse: His mini-mecha is basically the only functional piece of equipment he has because he technically never put in a bathroom; everything else he has is usually missing a key component of some sort. It's implied that the whole bathroom bit is how he mentally got over not "completing" it.
* MadScientist: He even has the look, the EvilLaugh, and a [[MadScientistsBeautifulDaughter beautiful daughter.]]
* MiniMecha: A humanoid red model was his best work in his debut. The only thing he hadn't finished was putting in a bathroom.
* TakeOverTheCity: In his first appearance. Jimmy assumes he's just gonna take over the world, but he says he's going for something smaller.
* WouldHurtAChild: Considering the showdown he usually has with Jimmy, this trope suits him. In crossover with WesternAnimation/TheFairlyOddParents, he ouright tried to kill him using Jorgen's magic. Thankfully, fairy magic is not made to harm.

[[folder:Beautiful Gorgeous]]
->Voiced by: Wendie Malick

Professor Calamitous's daughter. Her real name's Georgia Calamitous. Jimmy, Carl, and Sheen are easily seduced by her looks.
* AffablyEvil: Much like her dad.
* AnnoyingLaugh: Snorting variation in every full, uninterrupted EvilLaugh. Sheen even lampshades it.
* BeautyMark: On her right cheek near the upper lip.
* BeleagueredAssistant: In ''Operation: Jet Fusion''. She often bemoans having to do Calamitous's dirty work and put up with his eccentricities.
* BondVillainStupidity: She devised a death trap for Jimmy and Jet Fusion instead of killing them directly like majority of Bond villain. Considering her debut is in an episode parodying spies film, it's to be expected.
* DeadpanSnarker: She often has something snarky to say.
* DudeMagnet: How every guy in the show reacts towards her.
* IKnowKarate: To be accurate, she knows 112 forms of martial arts. She proved her prowess by getting the upper hand on Jet Fusion.
* ImpossibleHourglassFigure
* InterspeciesRomance: With the Junkman due to Jimmy's LovePotion.
* MadScientistsBeautifulDaughter: Her name is half James Bond Reference, half beating this trope over your head.
* MeaningfulName: Her dad wasn't exactly very creative with the name. Or subtle.
* MindControlDevice: She made one to hypnotize Jet Fusion in the form of a box candy. Also did this Jimmy with his HypnoRay.
* MsFanservice: Understatement of the year.
* RunningGag: Every time she mentions she wanted to have a certain career other then villainy, she always gets interrupted or cut off. [[spoiler: It was to make [[WhatTheHeckIsAnAglet aglets]] for a living.]]
* ThenLetMeBeEvil: Apparently she never wanted to be evil; just felt obligated to because her father was doing it. [[InTheBlood Then comes "My Big Fat Spy Wedding"...]]
* TrappedInThePast: Which becomes her fate at the end of the series.
* UglyGuyHotWife: With Junkman.
* TheUglyGuysHotDaughter: Presumably, she got her looks from her mother.

[[folder:Jimmy Negatron]]
->Voiced by: Debi Derryberry

An evil boy genius who lives in the Evil Dimension.
* BeardOfEvil: He has a goatee, even for a preteen.
* BigBad: Of "Jimmy Neutron vs. Jimmy Negatron".
* CanonForeigner: Made for the Jimmy Neutron vs. Jimmy Negatron game.
* CanonImmigrant: Downplayed. His traits served as the inspiration for fellow villain Evil Jimmy.
* EvilTwin: Of Jimmy Neutron.
* FauxAffablyEvil: He seemed gentle to Neutron at first, but he is evil after all.
* ForTheEvulz: He is an EVIL Boy Genius.

[[folder:The Herminator]]
->Voiced by: Rob Paulsen

A creation of Jimmy Negatron who can travel through time.
* TheAhnold: Thanks to the fact he is a spoof of the Terminator.
* CanonForeigner: Made for the Jimmy Neutron vs. Jimmy Negatron game.
* CoolShades: In a loading screen for the game, he is seen wearing them.
* TheDragon: For Negatron.
* {{Expy}}: Of the T-800 from Film/TheTerminator.
* {{Foil}}: To Goddard. Both are robots made by their respective creators.
* HeelFaceTurn: [[spoiler:He redeems himself to imprison Negatron.]]
* InUniverseNickname: Hermin.
* LockedInARoom: Hermin likes to get locked up in the broom closet.
* MinionWithAnFInEvil: Hermin isn't bright for an evil creation.
* SkeleBot9000: He is a robotic skeleton.

[[folder:The Nanobots]]
->Voiced by: Daran Norris (01) and Tom Kenny (02)

A duo of nanobots created by Jimmy to operate several of his inventions. They almost immediately go haywire and become increasingly insane and fanatical as the series goes on.
* BewareTheSillyOnes: Their personalities and bickering is mostly comical. However, these two are easily among the most dangerous antagonists in the series as their second appearance was literally seconds away from the extinction of the human race.
* FatAndSkinny: 01 is shorter and rounder while 02 is tall and lanky.
* KnightsTemplar: They take their anti-bullying directive (and whatever other task Jimmy gives them) VERY seriously and well beyond the point of overkill.
* LogicBomb: How they are typically defeated. Their first appearance Jimmy abused their directive to protect him from attackers by beating himself up in front of them. In their second appearance (after Jimmy's first attempt at this made things much [[KillAllHumans MUCH worse]]) Jimmy overloaded them by forcing them to calculate the exact value of pi. In addition, when Jimmy repurposes them to proofread his artistic classwork, his attempts at poetry is so bad it also has this effect.
* ObliviouslyEvil: To them, they're not doing anything wrong. They're simply carrying out Jimmy's orders to protect him/correct errors. And in Fundemonium, they're convinced that the townsfolk they are terrorizing are enjoying the mayhem they cause.
-->'''01:''' It warms my dials to bring such joy to the world.\\
'''02:''' (sighs happily) I too feel the love. KEEP FIRING!

->Voiced by: Creator/TimAllen, Creator/JessHarnell (singing voice)

The host of the hit game show "Intergalactic Showdown" and [[BigBad the main villain]] of the TV movie "Win Lose and Kaboom".
* BigBad: Of "Win Lose And Kaboom".
* DoingInTheWizard: His seemingly supernatural hold over reality, time and space is actually caused by a pair of matrix generators hidden in his cuff links.
* FauxAffablyEvil: Rarely drops his cheery, hammy attitude even while threatening to ''blow up people's planets''. At the end, he finally stops and decides to [[LetsGetDangerous get serious]].
* {{Hypocrite}}: Insists during the race that there's no cheating allowed, but permits the Brains to put Jimmy and the gang into a LotusEaterMachine. Later he panics at the idea of his quadrant being blown up despite the fact that his entire show is about blowing up completely innocent planets simply because their species [[DisproportionateRetribution lost a game]].
* KnightOfCerebus: He is more than capable of destroying planets and transmitting matter and energy, courtesy of his matrix generators.
* LaserGuidedKarma: He is forced to hand over his show to the Brain aliens and advertise an exercise machine that implements ElectricTorture, which he says is extremely painful.
* LargeHam: He's a GameShow host. It comes with the territory.
* OmnicidalManiac: "Winner gets a brand new car! Loser gets their home planet ''destroyed!''"
* TheOmnipotent[=/=]RealityWarper: Thanks to the matrix generators in his cuff links.
* SmugSnake: He's definitely dangerous, but his pride makes him rather short-sighted.
* TimeAbyss: Implied, as April states that his show has existed for eons.
* VillainousBreakdown: Loses it when he discovers that his show is about to be destroyed.

[[folder:Zix, Travoltron, and Tee]]
->Voiced by: Creator/MauriceLaMarche (Zix), Creator/JeffBennett (Travoltron), Creator/KevinMichaelRichardson (Tee)

A trio of space bandits Jimmy and friends met when they tried to dig for Asterubies. Later, they tried to sell shrunken Retroville townspeople as toys and joined the League of Villains.
* ArmorPiercingQuestion: After having a HeelFaceTurn of his own, Tee uses one of these on Zix and Travoltron to make them undergo one.
-->'''Tee:''' Well why ya gotta be villains?!\\
''(Both Zix and Travoltron stammer trying to find an answer and failing)''
* ButtMonkey: Tee was treated as this by his fellows in the League of Villains. This and Sheen's willingness to hear his story out were what triggered his HeelFaceTurn.
* GoodFeelsGood: What Zix and Travoltron thought after helping Jimmy and friends, showing that their HeelFaceTurn would be permanent.
* FingerGun: All three of them use this motion when shooting some kind of gooey substance used in sealing Jimmy's lab.
* HeelFaceTurn: Tee during Jimmy and Sheen's imprisonment. Zix and Travoltron followed during the casts' time in Cretaceous Era.
* ManHug: Tee really likes to give this. [[CuddleBug Well, a bit too much]]. Travoltron too, to a lesser extent.
* NoCelebritiesWereHarmed:
** Tee is an alien who talks and acts like Creator/MrT.
** Travoltron acts like Creator/JohnTravolta. Or at least his character in ''Film/SaturdayNightFever''. His name is even a parody of John Travolta's last name.
** The third one, Zix, talks like Creator/JonLovitz. A bit more devious than Jon Lovitz though...
* RealMenHateAffection: In contrary to Tee and Travoltron, Zix hates the ManHug, but he will accept a handshake with his teammates.
* RealMenWearPink: Tee mentions in "The Incredible Shrinking Town" that he dreams of opening a dress shop.
* SpeaksFluentAnimal: They can only understand and speaks lizards' language, since they said they were in the same family as them. They used this ability to distract and send a T-rex away from eating Jimmy and his friends.
* VerbalTic: Tee tends to have "Fool!" in most of his sentences.

[[folder:The Twonkies]]
->Voiced by: Creator/RobPaulsen
* BerserkButton: '''''MUSIC'''''. Seems to have stopped after their first appearance, though, as one can be seen during a big musical number at one point.
* TheCameo: They can be seen appearing in a brief time in several episodes, can even be seen several times in one episode.
* {{Expy}}: They're very reminiscent of the titular monsters from ''Film/{{Gremlins}}'' (starting out as harmless and cute creatures before morphing into dangerous monsters) as well as the Crites from ''Film/{{Critters}}'' (they're aliens and they often get around by rolling into balls).
* FishEyes: They have them.
* KillerRabbit: And how?
** VillainDecay: After their first appearance, Twonkies are treated as if they were normal rabbits.
* MonsterOfTheWeek: In ''Attack of the Twonkies''. They later became {{Recurring Extra}}s.

[[folder:The Junkman]]
->Voiced by: Creator/CharlieAdler
* DirtyCoward: He breaks his promise to Jimmy, Carl, Sheen, Goddard and the Brobot's and leaves them on the ship to die.
* EvenBadMenLoveTheirMamas: Subverted. He sold his mother and took the best offer for her due to the fact that he "couldn't put a price on her".
* ExtraEyes: Has an additional set of eyes on the back of his head.
* FatBastard: He's a fat jerk who only cares about the profits that can be made from what he can sell.
* FauxAffablyEvil: Surprisingly laid back for a repulsive alien creature that runs a shady business, but at his core is positively ruthless.
* InterspeciesRomance: With Beautiful Gorgeous.
* LargeHam: Charlie Adler at his best.
* MultiArmedAndDangerous: He has four arms and is really evil.
* PetTheDog: Subverted:
** He mentions that his alien dog, Roxie, is the only thing in the galaxy that ever showed him love, loyalty and affection...then offers to sell her for a ludicrously high price.
** He's also not pleased when she [[DefectingForLove falls in love with Goddard]] and calls her a traitor.
* TrappedInThePast: His fate in the series finale.
* UnholyMatrimony: Parodied when Jimmy uses a love potion on him and Beautiful Gorgeous. Their hatred for each other promptly becomes love.

[[folder:Baby Eddie]]
->Voiced by: Mark [=DeCarlo=]

Jimmy's 17.5-month-old cousin. Despite his infantile appearance, he's actually very devious and a genius; capable of walking, speaking fluently, and devising a plan to kill all of the Neutron family members. He later joined Goobot's League of Villains.
* BrainyBaby: A baby capable of reading, walking, talking and various things human adults can do, except changing his own diapers and controlling his excretion/digestive system.
* BitchInSheepsClothing: His first appearance. Since his identity had been uncovered, he dropped the nice facade in subsequent appearances.
* CasanovaWannabe: Tried flirting with Beautiful Gorgeous, with negative results.
* CharlieBrownBaldness: Has one visible gravity-defying strand of hair only. Justified, in that he's still a baby.
* CoolBike: His motorcycle can frickin' ''bring him to space''. Too bad it only appeared in the "bad guys assemble montage" at the beginning of the "League of Villains" episode.
* EnfantTerrible: Duh.
* EvilGenius: Who knows how a 17.5-month-old baby can outsmart Jimmy at first, and almost succeed in killing his family members using Jimmy's own things?
* EvilSoundsDeep: He has a really deep voice, a clear contrast to [[VocalDissonance his small appearance]].
* {{Expy}}: He has several similarities with [[WesternAnimation/FamilyGuy Stewie Griffin]], both are [[BrainyBaby baby geniuses]] wih a rather unbabylike attitude.
* OnlySaneMan: Putting aside his need to change diapers, he's mostly this with King Goobot.
* RunningGag: He kept asking his fellow teammates to change his diaper with no success. The joke came in full circle when he took off his own 5-day-old diaper to chase a T-rex away.
* StatingTheSimpleSolution: While other members of the League of Villains debated on how to kill Jimmy and Sheen using convoluted (or even silly) ways, he stepped up and said "Just blow him into deep space!" to which everyone agreed.
* TrappedInThePast: His official defeat.

[[folder:Eustace Strych]]
-> Voiced by: Creator/RobPaulsen

A snobby rich kid who buys all of his gadgets from his dad. He's one of the members of the League of Villains created by Goobot.
* BadBoss: He uses his personal butler, Blix as an abuse dummy.
* EvilBrit: Has a UsefulNotes/{{British Accent|s}} to go with his rich jerk persona.
* EvilCounterpart: To Jimmy. They both have a lot of high-tech gadgets, but while Jimmy is usually well-behaved and makes them himself, Eustace has his inventions bought and is a spoiled brat.
* EvilIsPetty: He is a petty, sadistic jerk.
* HateSink: Just look at his tropes.
* {{Jerkass}}: He's very rude to everyone, especially Jimmy, and he used Cindy's love to emotionally crush Jimmy and then, he forced Jimmy to watch Goddard die.
* KickTheDog: He does many in his first appearance:
** First, he steals Jimmy's friends with gifts.
** Second, he says mean things to Jimmy in front of his friends and Hugh.
** Finally, he makes Jimmy bet Goddard in a battle against his robot cat and when he reveals his true colors, he throws Cindy to the ground and insults her.
* PragmaticVillainy: Forms an EnemyMine with Jimmy and his pals in "King of Mars" when [[SiliconBasedLife the Martians]] try to destroy it. Not because of any moral reasons, mind you, but because Earth is where he keeps all his stuff.
* RichBastard: While his billionaire dad is a decent guy, Eustace himself is a selfish jerk.
* SanitySlippage: Later episodes imply that his vendetta against Jimmy has left him with a few screws loose. He even lampshades this trope ''while [[LaughingMad laughing insanely]]!''
* SmugSnake: Probably one of the less threatening antagonists Jimmy has faced.
* SoreLoser: Whenever he loses a competition, he has Blix bend down while he kicks him in the rear repeatedly.
* SpoiledBrat: His father has difficulty disciplining him until Hugh encourages him to do so. When his dad finally punishes him for his misbehavior, he just yells at him while crying when he's sent to his room.
* TantrumThrowing: Done when he's kicking his butler.
* TrappedInThePast: His fate in the series finale.

[[folder:Grandma Taters]]
->Voiced by: Edie [=McClurg=]
* AffablyEvil: One of the best examples in the show. She has a friendly, pleasant and sugary-sweet demeanor, despite being an evil alien being that wants to hypnotize all of humanity.
* BlackEyesOfEvil: Can make her eyes look like this at will.
* HumanAliens: Her entire species apparently looks like a bunch of identical old ladies. They also all have the same AffablyEvil demeanor.
* MassHypnosis: Her debut episode, she uses a TV series to hypnotize the whole world into becoming {{Stepford Smiler}}s.
* ToServeMan: She apparently likes to drink brain juice and in "League of Villains" she tells Baby Eddie that she could ''literally'' "eat him up" if she wanted to.
* TrappedInThePast: With the other villains.