Carl Wheezer. His haters don't like him primarily because he came off really annoying with his weird feelings in Judy, his weird fixation with llamas and his whining. It didn't help his character Took a Level in Jerkass later on. On the other hand, others at least find him likable and funny and try get past the episodes such as "Carl Wheezer: Boy Genius".
Cindy Vortex. While people are fully supportive of her and Jimmy ending up together, some people think Cindy's pride is no excuse for how she treats Jimmy and his friends. This is when people really miss how more sympathetic and friendly she was in the movie. Some good examples would be in "The Incredible Shrinking Town" and her musical number in the Valentines Day episode.
Despite his infamous spin off, Sheen does still have a few fans who find him funny (in the movie and the original show, anyway).
Bolbi is an Ensemble Dark Horse, but some people want him to shut up and can't stand the memes of him that keep popping up.
Bizarro Episode: "I dream of Jimmy" features some really absurd humour and bizarre scenes. Justified - the bulk of the weird happens inside Carl's dream.
Jimmy is very similar to Dexter, being a diminutive, short-tempered 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.
Critical Research Failure: Happens all the time, courtesy of Rule of Cool and lazy writing. Kinda surprising, considering how smart Jimmy is. For one thing, Jimmy has stated that Australia is a country, not a continent (it is both). He could've just been bluffing and trying to make up an excuse to argue with Cindy.
Designated Hero: Jimmy is not evil, just a jerkass, but he does cause many of the problems he has to fix. Cindy herself lampshades it. In fact, his arrogance, ditzyness, and the problems he caused throughout the series are one of the reasons why he has made so many enemies.
Designated Villain: Cindy has a tendency to be subject to this trope more often than other characters:
It's especially apparent in "Holly Jolly Christmas". She and Libby are given lumps of coal from Santa at the end and Libby suggests that this is because of their attempting to humiliate Jimmy, smoothly glossing over the fact that the reason Cindy and Libby decided to do it in the first place was to make Jimmy pay for hurting Carl's feelings in class, when Jimmy tried to persuade Carl that Santa Claus doesn't really exist (in Jimmy's defense, he did apologize for that). In that particular scene Cindy is angry at Jimmy not because she necessarily believes in Santa herself but "that's not the point". Later on, she holds Jimmy responsible for ruining Christmas first for Carl, then for everybody else (and she's 100% right about that since it's Jimmy who accidentally knocked out Santa). All in all, Cindy and Libby definitely could have been nicer to Jimmy but seeing them punished for humiliate Jimmy is fair enough for not only telling the city but to the world seem cruel enough doesn't seem in same level.
In "Best in Show" Cindy has Goddard disqualified from a pet contest on a very solid basis of him not being a real dog and thus not eligible for participation according to the rules which is enough to brand her the asshole of the week. And while that doesn't excuse her not being able to spit out a thank you to either Jimmy or Goddard when the latter saves her life at the end, if Jimmy didn't use the opportunity to rub it in her face how wrong and immoral she was and how much better a person he is, she most likely would have apologized.
First Installment Wins: While the other two seasons are when the show started getting more popular, some people think season one had better humor and character portrayals.
Franchise Original Sin: Jimmy had a problem throughout the series of being arrogant, abrasive and causing at least half the problems of the show. But he also had many sympathetic qualities, worked to fix these problems and was called on this actions to counterbalance it to make him a relatable, likeable, yet flawed character. When Planet Sheen rolled around, Sheen had the same problems, but none of the redeeming qualities nor was he called out for his actions, causing many of the complaints people had with that show.
Fountain of Memes: Hugh Neutron, Carl, and moreso Bolbi have an internet following based on this.
In Retroville 9 Jimmy creates high-tech baseball gloves and automatic homerun hitting bats neutronized with the skills of three baseball players for his struggling baseball team. They effectively cheat their way to the little-league finals in Japan. The players Jimmy used were Barry Bonds (an alleged cheater), Mark McGwire (a confessed cheater) and Babe Ruth (dead).
Germans Love David Hasselhoff: The series has its dedicated fanbase within the United States but one could argue it's become relatively forgotten over the years, hardly ever making it to any English-language "Top 10 Best Nickelodeon Shows" video on YouTube. Compared to this, Jimmy Neutron continues to be immensely popular in Latin America.
Growing the Beard: The season two and three episodes tend to stand out more, shedding the spin-off-of-the-movie feel. In the season one finale, Libby had decided to keep her hair braided, making her stand out more as well.
Jimmy. He means well, but nobody likes him or his inventions (it's taken Up to Eleven when we eventually realize that not even his own relatives want anything to do with him). There may be a good reason for that, since he can be a rude, arrogant, condescending, know-it-all Insufferable Genius with a Lack of Empathy, especially in Season 3. It doesn't help the fact that many of his inventions have endangered the lives of hundreds of people in Retroville. No wonder why the guy made so many enemies throughout the course of the series.
Cindy only acts like a jerk to Jimmy to mask her true feelings for him. There's also some hints that she may have a bad home life and the fact she feels inferior to Betty. This is especially more evident in season three where every time she tries to help Jimmy, he ignores her, takes credit for her ideas and blames her for his mistakes.
Nick. In later episodes, he seems to have no purpose except for randomly breaking his leg. In the series finale where he breaks his leg again, it's implied he now hates himself because of it. There's also the fact that he had a lot of potential in his character as stated below. He was in a lot of merchandise, but nobody dared to make him relevant to the series, so he might as well be THE woobie of the franchise.
Whenever a company or creator is caught either rereleasing a product or reusing certain touches, an edit of the scene where Sheen shows off Ultra Lord and is lightly reprimanded by Mrs. Fowl for bringing it to show and tell for the seventh week in a row, but replacing Ultra Lord with whatever point is being illustrated, tends to show up.
King Goobot crossed it in The Movie, when he reveals the parents of the kids are going to be sacrificed to Poultra, and how it's all Jimmy's fault because of Jimmy's transmission.
Beautiful Gorgeous hypnotizes Jet into killing Jimmy in front of many innocent lives and have him arrested for murder.
Evil Jimmy starts off as a simple prankster at first...up until he creates an evil version of Jimmy's planet and attempts to destroy the old one and forces Jimmy to watch, and trap him in his world of darkness.
Meldar may seem like an ordinary game show host, but he threatens to blow up the losing planets and forces the losers to watch.
Sam. While he was already a Jerkass when the show started, The N Men showed his asshole status Up to Eleven when he sends the kids (minus Jimmy) to Area 52 due to their carelessness. While Jerkass Has a Point stands here, his behavior isn't necessary. It comes even more to an annoyance when Sheen came to him for help in order to get a main component to make Carl burp against Hulk-Jimmy (It Makes Sense in Context), but Sam rudely says no, all while calling Sheen a 'freak', prompting Sheen to just take it and have Sam complain that he owes him a $1.80 for it. After thanking him at the end of Jimmy's speech, he's still complaining about the $1.80.
Miss Fowl to some due to her treatment of her students, especially Jimmy and Sheen.
Aunt Amanda's treatment towards Jimmy sure rubbed fans the wrong way.
Seasonal Rot: Most episodes of Season 3 are considered the weakest by some fans. Averted with "The League of Villains", since it is considered one of the best episodes of the series.
Shipping: You'd be amazed at all the pairings fans make.
The title card for "Hypno-Birthday to You" has a copyright-friendly variation of The Beatles' "Birthday" playing over it.
The music we hear in the background during the Mt. Incredibly Unstable scene in "The Mighty Wheezers" bears an uncanny resemblance to the theme of the 1989 ''Batman'' movie.
Some of the background music in Season 3 episodes like "Fundemonium" and "The Incredible Shrinking Town" sounds very similar to "Hey Ya!" by OutKast.
Season 1's "Battle of the Band" has Jimmy, Carl, and Sheen play a copyright-friendly version of Green Day's "Warning".
At the very end of Season 2's "Jimmy for President", Bolbi plays some music on a radio that sounds like Funkytown. This same music plays during Sheen's odd dance moves in "Crouching Jimmy, Hidden Sheen".
Speaking of the latter episode, the music playing during Sheen's training montage has a very similar tune to Kung Fu Fighting by Carl Douglas.
A soundalike of the Mission: Impossible theme can be heard in "Win, Lose, and Kaboom" when Jimmy and friends infiltrate the military base to retrieve the fallen space rock. This same music can also be heard in "The Incredible Shrinking Town."
A soundalike of the classic "Yakety Sax" can be heard in "Who Framed Jimmy Neutron?" when Jimmy, Carl, and Sheen are being chased by a bear.
Nick. He had a pretty major role in the movie and he's like a big brother to Jimmy. He is a perfect foil to Sheen, so you can see a lot of potential in his character. He was going to be part of the gang, but it was dropped for some reason after season one. There were plans to make him part of the main cast in season four, however.
Brittany as well. She could've made a perfect comic foil to the otherwise brainy Cindy and Libby, like Carl and Sheen are towards Jimmy. But sadly, she only played small roles through the series. It helps that she's the nicest character on the show. If season four did come to be, she would've had a larger role.
Elke from "Carl Wheezer: Boy Genius". While Carl had no right to mistreat his friends and lie to Elke, she could've been a great way to end Carl's annoying and creepy interest in Judy. It doesn't help that there's fan art of her everywhere.
In fact, name any other kid in Jimmy's class who isn't himself, Cindy, Libby, Carl or Sheen.
For Jimmy/Timmy Power Hour 3, which was originally was supposed to be a Grand Finale for bothshows. Who didn't want to see a 3D Dimmsdale and a 2D Retroville, Crocker spazzing out in 3D or the alien Mark Chang in 3D? And better yet, send the Gigglepies to Retroville and the Twonkies to Dimmsdale (we wonder if Timmy has learned from the Gigglepie experience?).
The Space Bandits vow to track down Skeet, but in their next appearance, they don't do anything about it.
Unintentionally Sympathetic: Skeet, the dumb McSpankies worker is half-seriously considered understandable for his dislike of Jimmy- not only does Jimmy rub his intelligence in Skeet's face several times (such as the sodium chloride joke), but also Skeet is correct that Jimmy must punch in the customers orders on the tills, as the tills are used to make sure that the correct amount of money is in the register at the end of the shift as well as well as inventory tracking. He's Right for the Wrong Reasons, employs child workers and underpays them, and is a pretty huge Jerkass, so this sentiment is mostly considered a joke.
Brittany, since Cindy and Libby often brush her off and pick on her when she tries to be nice to them. Sweet, underconfident, innocent and kind to everyone, Brittany is just that one character you wanna hug when things go wrong for her.
Betty in "Vanishing Act".
Carl has his moments in woobiness. He's normally nice, but he's usually the first victim of Jimmy's inventions.
Alternative Title(s):The Adventures Of Jimmy Neutron