[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/jimmy_neutron_8.png]]
[[caption-width-right:350:The gang's all here]]
[[foldercontrol]]

!Primary characters
[[folder:Jimmy Neutron]]
[[quoteright:263:http://static.tvtropes.org/pmwiki/pub/images/jimmyneutron.png]]
->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?
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* {{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 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.
* BerserkButton: Do NOT give Jimmy an F. [[WesternAnimation/TheFairlyOddParents Denzel Crocker]] in the [[CrossOver Jimmy Timmy Power Hour]] learns this the hard way.
* BewareTheNiceOnes: While Jimmy's hardly a stoic, it takes a lot of effort for his close friends to ''really'' piss him off.
** In "Carl Wheezer: Boy Genius", in which Carl's taking on Jimmy's genius identity just to impress a girl pushes Jimmy to the absolute limits of sanity. Considering that Carl is more than willing to abuse his lowly assistant, nobody can blame Jimmy for wanting to blow his friend's cover at any given time and for punching him in the face.
** In "The N-Men", where he gets turned into a big jerk monster after years of putting up with Cindy and her insults. It is also only when Cindy sees the army about to kill him, that she realizes this is all her fault and that the only way to stop Jimmy from rampaging through the city is to get down on her knees and beg for forgiveness.
* 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 instantenously.
** 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 comments 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*]]
* 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.
* 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: Happens 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 {{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 Poultra is bearing down on him.
* 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:
--> '''Jimmy''': *science babble about a spider*
--> '''Sheen''': Fascinating! Can you make it do the hokey pokey?
--> '''Jimmy''': Sheen, go home.
* DrunkWithPower: In "Hall Monster".
* {{Expy}}: He's very similar to [[WesternAnimation/DextersLaboratory Dexter]], being a diminiuitive and easily frustrated boy genius who has his own laboratory which leads to hillarious mishaps. Ones 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.
* {{Flanderization}}: 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 is he was a boy genius. In season three, he's more irritable, vain and hostile towards everyone. See below.
* FutureLoser: In the 'BadFuture' of ''The Tomorrow Boys'', Future!Jimmy is a slack-jawed loser, wanted by the evil dictator Libby, with a five-o'clock shadow and Cindy as a wife. Current!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.
* 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."
-->--later...--
-->'''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 tries not 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.
* KidHero: Jimmy is only an elementary school student but always saves the day from trouble, albeit caused by his own mistakes.
* LittleProfessorDialogue: Justified partially in that he does actually have an IQ of ''210''.
* NerdsAreInnocent: He's a an adorable and dorky child prodigy who loves and excels at science...and still believes in cooties.
* 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.
* OddFriendship: An adorable and dorky 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 black girl who loves music and electronic gadgets 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]].
* SensitiveGuyManlyMan: The sensitive guy to Nick's manly man.
* 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: For someone so smart he tends to let his overconfidence and arrogance get the best of him quite a few times.
* TookALevelInJerkass: Towards the end of season three, he becomes more irritable and hostile towards his friends.
* TVGenius: He is an elementary school student 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, sounding 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]]

[[folder:Carl Wheezer]]
[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/carl_85.png]]
->Voiced by: RobPaulsen
-->'''Full Name''': Carlton Ulysses Wheezer
Jimmy's shy, asthmatic best friend who has an unhealthy obsession with llamas and Jimmy's mom.
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* 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.
* CowardlySidekick: To Jimmy.
* CatchPhrase: "My scapula..."
* {{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.
* {{Flanderization}}: He eventually goes from being Jimmy's shy, asthmatic and introverted best friend to a more whiny and childish person.
* {{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 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. Finally, Jimmy gets fed up with Carl's ungratefulness and punches him in the face.
* 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.
* NerdyInhaler: Carl uses an inhaler very frequently and is also allergic to almost everything.
* OwMyBodyPart: He seems to have a really tender scapula.
* PrecociousCrush: On Jimmy's mom.
* ShrinkingViolet: He's generally shy and nervous.
* 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 coould do this from a ventriloquism lesson. The result was awesome. He was capable of impersonating Cindy's Mom's and Zix's voice perfectly.
* YouthfulFreckles: Has many freckles that match his red hair.
[[/folder]]

[[folder:Sheen Estevez]]
[[quoteright:250:http://static.tvtropes.org/pmwiki/pub/images/sheen_jimmy_neutron.png]]
->Voiced by: Jeff Garcia

One of Jimmy's best friends who is obsessed with the comic book superhero Ultra Lord.
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* 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". Sheen was supposed to be Japanese, but since nobody could do anything Japanese sounding, Jeff Garcia came in and he was made Mexican.
* 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 warth 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.
* BreakoutCharacter: Gets his own SpinOff, ''WesternAnimation/PlanetSheen''. That doesn't mean people liked it.
* ButtMonkey: He suffers a fair amount of physical abuse. He is also sometimes used to test Jimmy's experiments, but he actually enjoys this.
* {{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.
* {{Flanderization}}: In ''WesternAnimation/PlanetSheen'', all of his serious traits are totally erased; changing him from his nerdy and hyperactive self to an obnoxious prick. Some people may not know this, but in the movie, he was fairly intelligent and less hyperactive.
* TheFriendNobodyLikes: Sheen constantly annoys everyone with his ramblings about Ultra Lord, low intelligence, annoying shouting and the fact that he can be insensitive. Sure makes you wonder why they don't go looking for him in ''WesternAnimation/PlanetSheen''.
--> '''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. Finally, he brutally strikes them with a lightning bolt and actually kills them. When he sees their dead bodies, he realizes his new powers have turned him into a monster.
** 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.
* {{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 to remember her]].
* PluckyComicRelief: He serves as the funny sidekick on the show.
* PuppyLove: With Libby.
* RedOniBlueOni: The red to Nick's blue.
* TheSlacker: Watches Ultra-Lord while trying to do his homework.
* TookALevelInDumbass: He goes through some serious Flanderization in his infamous spin-off show.
* WideEyedIdealist: He believed that there was goodness in Tee and was proven right.
* WithGreatPowerComesGreatInsanity: When he becomes a genius, he gains telekinetic and psychic powers and plots to destroy all of Retroville. Not to mention he actually kills Jimmy and Carl.
[[/folder]]

[[folder:Cindy Vortex]]
[[quoteright:177:http://static.tvtropes.org/pmwiki/pub/images/cindyart_1.png]]
->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.
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* 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.
* BadassBookworm: Other than being smart, Cindy is more athletic than Jimmy and practices a lot of martial arts sports.
* BareYourMidriff: As Special Girl.
* BelligerentSexualTension: With Jimmy.
* BlatantLies: Cindy is the worst liar in the world.
* 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 interest in other girls.
* TheCorruptible: She tends to get easily flattered by the villains into helping them. See below.
* DefrostingIceQueen: Towards Jimmy over the course of the show, as her affection towards him becomes more evident.
* DependingOnTheWriter: You can't help but wonder how she is able to be a mean-spirited bitch in one episode, a genuine if respectable rival to Jimmy in the next and a totally likeable character in the third, only for the cycle to start all over again.
* DistaffCounterpart: To Jimmy.
* {{Flanderization}}: In the movie, she was a lot kinder and she and Jimmy got along better. In the series, she's become more arrogant, stubborn, snarky and spoiled and she and Jimmy fight more. It is up to fans to debate whether or not this was a good thing. In the cancelled season four, Cindy would've been de-Flanderized, since she and Jimmy would become official.
* TheFriendNobodyLikes: Mainly due to the fact that she's constantly a bitch towards Jimmy and his friends. Libby and Brittany are the only members of the gang who truly like her.
* GirlishPigtails: In the movie and shorts before trading it to a ponytail.
* GoofyPrintUnderwear: Polka dot panties.
* GreenEyedMonster: At least part of her problem with Jimmy stems from this. In the Movie, she says that ''she'' was the smartest kid in her old school until she moved into town and met Jimmy. It's a given that she didn't appreciate being knocked down to second best. It is also shown that she feels inferior to Betty Quinlan and not just because Jimmy likes her.
* 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.
* IJustWantToBeSpecial: She actually admires Jimmy, is very fond of him and secretly wants to be as brilliant and smart as him.
* 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.
* ItsAllMyFault: In "The N Men", when she realizes that her mistreatment towards Jimmy has turned him into a hulking jerk monster.
* 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), so it sometimes comes as a shock to other kids when she actually uses his first name as well 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. To be honest, Jimmy himself does call Cindy "Vortex" every once in a while but not even nearly as often as she calls him Neutron (and when he does, it usually means he's ''extremely'' pissed off with her).
* 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!
** "Beach Party Mummy" has this gem of an 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"!
* 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. While she is dumb to trust the Yolkians, so is everybody else in town except Jimmy. When she realizes that her actions put the whole Retroville in danger she is first to call on 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 army is after him, she realizes that this is all her fault and decides to make amends by helping him. Later as she dies, she gets down on her knees and apologizes to Jimmy for hurting him 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. That is also why she is EasilyForgiven later on
* NotSoDifferent: In regard to Jimmy. She constantly makes fun of his alleged nerdiness whereas in fact she loves science just as much as he does, she just can't compare to him in terms of IQ. Also, while her [[AlphaBitch Alpha Bitchy]] demeanor would suggest otherwise, she isn't really even that much more popular with other kids than Jimmy and aside from Libby and Brittany, she literally has no friends.
* NiceMeanAndInBetween: The mean one with Libby and Brittany.
* OnlySaneWoman: 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 taring the helm doesn't always prove to be the best idea either.
* 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]].
** In "The Incredible Shrinking Town", she acts uncharacteristically bitchy and mean spirited to Jimmy, even after he saves [[UngratefulBastard their lives]] from the Space Bandits. To make matters worse, Jimmy was being mercilessly tortured in that episode and at the end, she smashed his well-deserved trophy.
* PinkMeansFeminine: Wears pink sneakers and, as seen in the first episode, [[PantyShot light-pink panties]]. Also wore a pink shirt in TheMovie. 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: Played with. Her family does have a big mansion with a swimming pool (and even a butler) but Cindy herself is hardly a typical example of this trope: while it is shown in a couple episodes that she's rather greedy (to the point that she actually takes time to [[TheScrooge consider whether staying alive is worth of sacrificing her star ruby's]]), she isn't really seen wearing fancy clothes and never once boasts about her family's alleged wealth. In "Granny Baby" she even holds a yard sale. So, we may assume that while her parents are definitely above the national average in terms of income, she doesn't benefit from it too much.
* TheRival: To Jimmy.
* SlapSlapKiss: With Jimmy.
* SpoiledBrat: Think [[VideoGame/JumpStart Polly Spark]] meets [[ComicBook/ArchieComics Veronica Lodge]] and you've got Cindy Vortex.
* 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.
* UngratefulBitch: In "The Science Fair Affair", she doesn't win the blue ribbon after she clearly gave Carl, Sheen and Libby instructions on how to stop Jimmy's machine. Jimmy then tries to cheer her up, but she hits him instead.
* 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]]

[[folder:Libby Folfax]]
[[quoteright:191:http://static.tvtropes.org/pmwiki/pub/images/libby.png]]
->Voiced by: Crystal Scales
-->'''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, DJ's, and can throw a high note that would make most opera singers run for their money.
------
* BetaBitch: She plays this role to her best friend Cindy.
* BetaCouple: With Sheen.
* BigSisterInstinct: Libby serves as a big sister to Jimmy and is always trying to get him to come out of his shell.
* BlackBestFriend: To Cindy.
* 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.
* {{Fartillery}}: Gets this when she ate the Belch Boy packet in "The League of Villains" and proves to be ''better'' at it than Carl, given that she doesn't need seltzer or to be shaken to burp, and she can eventually control her burping to do it at will.
* {{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.
* OnlySaneWoman: She's the most levelheaded character in the series (along with Judy), much to her occasional frustration.
* PinkMeansFeminine: Her new design includes a pink long-sleeved shirt.
* PromotedToOpeningCredits: Libby is eventually in the title lineup at the end of the opening credits.
* 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.
* {{Tomboy}}: 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".
* 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.
[[/folder]]

[[folder:Goddard]]
[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/goddard.png]]
->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]]

[[folder:Hugh Neutron]]
[[quoteright:170:http://static.tvtropes.org/pmwiki/pub/images/hugh_neutron2_0.png]]
->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.
------
* AdultsAreUseless: Played straight with Jimmy's dad in the TV series, who 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?]]"
* 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]]

[[folder:Judy Neutron]]
[[quoteright:159:http://static.tvtropes.org/pmwiki/pub/images/judy_neutron2.png]]
->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.
* UglyGuyHotWife: With Hugh.
* WomenAreWiser: Compared to her bumbling husband.
[[/folder]]

[[folder:Nick Dean]]
[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/nick_jimmy_neutron.png]]
->Voiced by: Creator/CandiMilo

Another one of Jimmy's best friends, who is the cool guy that everybody loves at school, especially the girls.
------
* AllGirlsWantBadBoys: Which is why all the girls at his school dig him.
* 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.
* ButtMonkey: All of his later appearances 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.
* {{Flanderization}}: 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 Paper Tiger characterization suggests he would balk at even taking on the guards, if he had to do it again.
* 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 truly cares for Jimmy.
* 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.
* 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.
* ScreamsLikeALittleGirl: Whenever something frightens him.
* ManlyManSensitiveGuy: The manly man to Jimmy's sensitive guy.
* TheSixthRanger: He fits this role perfectly.
* TroubledButCute: A supposed tough kid who is considered cool and is popular with girls.
[[/folder]]

!Supporting characters
[[folder:Brittany Tenelli]]
[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/brittany_tenelli.PNG]]
->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.
* BareYourMidriff: She wears a pink and white midriff shirt.
* BookDumb: In "Raise of the Oozy Scab", she is said 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.
* TheChick: The prettiest female member of the gang.
* TheDitz: Of Cindy's circle of friends.
* DumbBlonde: Like a miniature [[ComicBook/JosieAndThePussycats Melody Valentine]].
* DumbIsGood: She's a ditz, but is the kindest character on the show.
* 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.
* HairOfGoldHeartOfGold: One of the nicest characters in the series.
* TheHeart: In Cindy's friend group, at least.
* MoralityPet: To Nick.
* NeverLearnedToRead: She can't read or write.
* 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!"]]
* SatelliteCharacter: Doesn't have much of a role except for completing Cindy's friend group.
* SimpletonVoice: Candi Milo at her best.
* TrueCompanions: With Cindy and Libby.
[[/folder]]

[[folder:Bolbi Stroganovsky]]
[[quoteright:300:http://static.tvtropes.org/pmwiki/pub/images/bolbi.png]]
->Voiced by: Creator/PhilLaMarr
------
* 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.
* {{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]]

[[folder:Betty Quinlan]]
[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/betty_quinlan.PNG]]
->Voiced by: Creator/KathSoucie
The girl of Jimmy's dreams, and sometimes the motivation for hi jinks in his effort to impress. Cindy doesn't care for her... for ''some'' reason.
------
* ADayInTheLimelight: She's the main protagonist and focus of "Out Darn Spotlight".
* 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]]

[[folder:Ms. Fowl]]
[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/ms_fowl.jpg]]
->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.
* 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.
* MeaningfulName: Fowl is another term for bird, in which fits her AnimalMotifs.
* 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]]

!Villains
[[folder:Sam]]
->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.
* FatBastard: And how?
* {{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''?
* 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]]

[[folder:King Goobot]]
->Voiced by: Creator/PatrickStewart (movie), S. Scott Bullock (TV series)

King of the Yolkians, and Jimmy's archenemy.
------
* ArchEnemy: To Jimmy.
* BigBad: He is the main villain in the movie.
* 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.
[[/folder]]

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

Jimmy's 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".
* 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]]

[[folder:Beautiful Gorgeous]]
[[quoteright:153:http://static.tvtropes.org/pmwiki/pub/images/beautiful_gorgeous_daughter_lady_5223.png]]
->Voiced by: Wendie Malick

Professor Calamitous's daughter. Her real name's Georgia Calamitous. Jimmy, Carl, and Sheen are easily seduced by her looks.
----
* 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"...]]
* UglyGuyHotWife: With Junkman.
[[/folder]]

[[folder:Meldar]]
->Voiced by: Creator/TimAllen

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]]

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

A group of Trio Space Bandit Jimmy and friends met when they tried to dig Asteruby. Later they tried to sell shrunk Retroville townspeople as toys and joined "League of Villains" created by Goobot.
----
* 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 League of Villains. This and Sheen's willing to hear his story were what triggered his HeelFaceTurn.
* {{Expy}}:
** 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 presumably even a parody of John Travolta's last name.
** The third one, Zix, talks like Jon Lovitz. A bit more devious than Jon Lovitz though...
* 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.
* RealMenHateAffection: In contrary to Tee and Travoltron, Zix hates 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 though 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 sentence.
[[/folder]]

[[folder:The Twonkies]]
->Voiced by: Rob Paulsen
* 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]]

[[folder:The Junkman]]
->Voiced by: Charlie Adler
* 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
* 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.
* UnholyMatrimony: Parodied when Jimmy uses a love potion on him and Beautiful Gorgeous. Their hatred for each other promptly becomes love.
[[/folder]]

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

Jimmy's 17,5-month-old cousin commonly called by people as "baby Eddie". Despite his baby-looking appearance, he's actually very genius; capable of walking, speaking fluently, and devising plan to kill all of Neutron family member. He's one of members of "League of Villains" created by Goobot.
----
* 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 covered, he dropped the nice appearance in subsequent appearances.
* CasanovaWannabe: Tried flirting with Beautiful Gorgeus with negative results.
* CharlieBrownBaldness: Has one visible gravity-defying strand of hair only. Justified somehow that he's still a baby.
* CoolBike: His motorcycle can frickin' ''bring him to space''. Too bad it only appeared in "Bad guys assemble montage" at the beginning of "League of Villains" episode.
* EnfantTerrible: Duh.
* EvilGenius: Who knows a 17,5-month-old baby can outsmart Jimmy ar 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 petite appearance]].
* {{Expy}}: He has several similarities with [[WesternAnimation/FamilyGuy Stewie Griffin]], both are [[BrainyBaby baby geniuses]] with 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 League of Villain 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.
[[/folder]]

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

A snobby rich kid who buys all of his gadgets from his dad. He's one of members of "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 while he's a spoiled brat.
* EvilIsPetty: He is a petty, sadistic jerk.
* {{Jerkass}}: He's very rude to everyone, especially Jimmy and he was using 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.
[[/folder]]

[[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.
* MassHypnosis: Her debut episode, she uses a TV series to hypnotize the whole world into becoming {{Stepford Smiler}}s.
* HumanAliens: Her entire species apparently looks like a bunch of identical old ladies. They also all have the same AffablyEvil demeanor.
* 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.
[[/folder]]
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