History Characters / TheAdventuresOfJimmyNeutronBoyGenius

* 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.

One of the clones Jimmy created of himself.

* EvilKnockoff: Though he was created by Jimmy himself rather than any of his enemies.
* NoCelebritiesWereHarmed: He sounds like Rob Paulsen doing a Creator/JackNicholson impression.

* TookALevelInDumbass: In the movie, he had his dumb moments and wasn't the sharpest tool in the shed, but he mostly resembled a very normal well-meaning father. In the show, he's the quirky ditz we know and love.

* HulkMashUp: In "The N-Men", the kids all get various superpowers that parody real comic book heroes. Jimmy turns orange like [[ComicBook/TheFantasticFour The Thing ]] and becomes a parody of both the Hulk and his alter ego Bruce Banner; while normally mild-mannered and highly intelligent like Bruce, his true powers awaken when he gets mocked and becomes a towering, infuriated beast of a man trying to destroy everything in this path.

* TheFriendNobodyLikes: Sheen constantly annoys everyone with his ramblings about Ultra Lord, low intelligence, annoying shouting and the fact that he can be insensitive. However, Jimmy and Carl still consider him to be a good friend and the three of them are quite close.

* {{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.

The main protagonist. He is a boy with a stunning IQ of 210 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?

* 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.

* BreakoutCharacter: During the time of the film's release and the early run of the series, Jimmy became {{Creator/Nickelodeon}}'s official mascot.

* CharacterizationMarchesOn: Jimmy is eventually transformed from a shy, InnocentProdigy with an everlasting passion for having fun to an ill-mannered and insufferable boy genius with an everlasting greed for superiority.

** In "Jimmy for President" has an... unusual example. He is disqualified due to "operating a zepplein onto school premises", (compared to Cindy and Sheen, who relied on more traditional means, bribery and blackmail.)

-->'''Jimmy:''' *science babble about a spider*
-->'''Sheen:''' Fascinating! Can you make it do the hokey pokey?
-->'''Jimmy:''' Sheen, go home.

* DontYouDarePityMe: Subverted. Describing himself as a "genius", Jimmy often brushes off every time other characters try to point out a problem in his plans and/or his own flaws, thinking they're just trying to feel sorry for him.

* 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.

* IntelligenceEqualsIsolation: DownplayedTrope. Jimmy's 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 and/or like him more than they let on, and sometimes he's just an insufferable genius. That said, unlike a lot of examples of this trope he has a consistent, mutually beneficial friend circle and can actually interact with people without freezing up.
* ItsAllMyFault: For all his InsufferableGenius and DisproportionateRetribution moments, not once was there ever a single moment where he would [[NeverMyFault refuse to take responsibility for his actions and even flat-out try to downplay them]] whenever his inventions would cause some sort of catastrophe at worst, and more often than not he is willing to clean up the mess he made himself.

* LackOfEmpathy: DownplayedTrope. Jimmy is often is blind to other people's feelings, no matter how obvious they may be. It's no wonder why he's better at making enemies than friends. That said, he usually is willing to fix whatever problems he made and his occasional callous nature isn't from malice but a lack of social kills.
* LittleProfessorDialogue: Well he does actually have an IQ of ''210''.

* TookALevelInJerkass: In the spin-off TV show, he's more arrogant, show-offy, condescending, and selfish (albeit [[JerkWithAHeartOfGold with a considerable good side]]); but in the third season, however, he's much more abrasive and hostile. One could imply it's the result of having to deal with a lot of archfoes and issues.

* TheUnApologetic: Whether Goddard suggests that Jimmy should apologies to his parents, Jimmy will always dismiss it out of his arrogance, as he thinks being a genius makes him always in the right. It normally takes some event to [[HumblePie make him apologize]].

* NiceMeanAndInBetween: The Nice to Jimmy's Mean and Sheen's In-Between. He is always willing to help out Jimmy despite knowing his inventions could be dangerous on him.

* NiceMeanAndInBetween: The In-Between to Carl's Nice and Jimmy's Mean. He's the wackiest and most high-spirited guy of the group, but does have a bit of an ego like Jimmy and tends to be a bad friend in certain circumstances.

* NiceMeanAndInBetween: She's the Mean to Nick's Nice and Libby's In-Between. She always rebels against Jimmy, but slowly grows more affectionate to him over the course of the series.

* NiceMeanAndInBetween: She's the In-Between to Nick's Nice and Cindy's Mean. She's not as mean as Cindy, but is more impulsive than Nick.

* NiceMeanAndInBetween: He's the Nice to Cindy's Mean and Libby's In-Between. He's the coolest kid in school who's usually nice and easy, though he's not without his BewareTheNiceOnes moments.

* NiceMeanAndInBetween: Whenever she's around, she substitutes for Nick as the Nice to Cindy's Mean and Libby's In-Between.

* NiceMeanAndInBetween: Travoltron, Tee, and Zix, respectively. Travoltron is the Nice, who like Sheen, is the wackiest of the trio and is often smiling. Tee is the Mean, being the most confrontational and aggressive of the group. Zix is the In-Between who is the often level-headed leader that tries to keep the trio together, while at the same time, trying to accomplish their evil goal at the time. Once they all pull a HeelFaceTurn at the end of the series, they all become nice.

* IntelligenceEqualsIsolation: Jimmy's 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 and/or like him more than they let on, and sometimes he's just an insufferable genius. The episode Normal Boy has him reduce his brainpower to be more normal, but a mistake instead made him dumb... only for a meteorite to head toward Earth, so everyone has to restore him.

* LackOfEmpathy: Jimmy is often is blind to other people's feelings, no matter how obvious they may be. It's no wonder why he's better at making enemies than friends.

* NerdsLoveToughSchoolwork: Completely averted - in fact, Jimmy hates school, just like any normal kid.

* GeniusDitz: He wrote the entire Ultra Lord website, which claims that he's the father of America (and the whole planet).

* TeachersUnfavoriteStudent: Miss Fowl has a particular dislike towards him due to his obession with Ultra Lord, to the point where [[ShowAndTellAntics he showed off his action figure of him for show and tell seven weeks in a row]], and because he is extremely BookDumb, to the point where he once scored a [[FMinusMinus F----]] on a test (one of his answers was that Ultra Lord was the father of the United States, which was on the official Ultra Lord website). She is also not above insulting [[HollywoodToneDeaf his terrible singing voice]], to the point where after she gives him a solo in the school choir to thank him for saving the town from the Twonkies (since they like terrible music but hate good music), she locks him in a sound-proof booth. In "Journey to the Center of Carl", when all of her students are too sick to go to school thanks to Jimmy's sick patches, she admits that she misses all of her students, except for Sheen.

* HeelFaceTurn: [[spoiler:He redeems himself to imprison Negatron.]]