Jimmy Neutron

James Isaac Neutron (or better known at Jimmy) is the titular protagonist of the television series and the 2001 movie. He is the world's smartest 10-year-old. He is named after scientists Sir Isaac Newton, and James Chadwick who was nicknamed "Jimmy Neutron", because of his discovery of the neutron.          
Jimmy is a genius inventor, but his inventions seem to cause more destruction than anything good, and it is usually up to him and his friends to stop them. He lives in Retroville with his robot dog, Goddard, who is named after Robert H. Goddard (a pioneer in modern rocketry) and his parents, Hugh Neutron, a bumbling used car salesman and dick-lover, and his caring housewife mother Judy Neutron.
== Trivia ==
* Jimmy uses alliterations in some of his catchphrases: "Pukin' Plutonium," "Jumpin' Jupiter," "Leapin' Leptons," and "Holy Heisenberg", as well as "Quakin' Quadrilaterals" and "Holy Herculaneum" in the books and online comics.
* During the time of the movie and early run of the series, Jimmy became a mascot for Nickelodeon.
* The only time in the franchise where Jimmy doesn't wear his iconic atom shirt is in the pilot.
* Jimmy is the only character to be shown streaking in public, though many fans definitely wouldn't put it past Sheen to do that, as well, at some point in the future, based on his(Sheen's) immaturity.
* Jimmy, Carl, and Sheen are the only characters in every episode of the original series.
* Jimmy has mentioned in the Planet Sheen pilot that he's built a brand new rocket just for one. It is unknown why he and others don't go looking for Sheen since we never see them in any episodes. Not counting Carl's cameo in Is This Cute?
** There was going to be a TV movie featuring Jimmy and the gang going to Zeenu to rescue Sheen, but due to Planet Sheen’s low ratings, production costs, and the writers moving on, it had been canceled.
* In the pilot, shorts, movie and early episodes, Jimmy's voice was more scratchy and high-pitched, but for the rest of the series, his voice became more profound and clear.
* He's been kissed by Cindy, Betty, and April.
* The only times where Jimmy cries are in Runaway Rocketboy, the movie, Brobot, and in My Son, the Hamster.
* Jimmy can't put his hands above his head and claims that it's physically impossible. This is most likely due to his swirly hairdo and the size of his head as a whole.
* In the show, Jimmy's a bad artist, but in the movie (and The Science Fair Affair), he can draw fairly well. This shows that Jimmy could draw if he had any creative talent, though it's only been seen in his invention blueprints.
* His favorite colors are the primary colors.
* In The Jimmy Timmy Power Hour Trilogy, whenever he is drawn in Butch Hartman style and is in Timmy Turner's universe, his watch sometimes disappears and reappears on his wrist due to an animation error. However, it can be featured in some scenes and in a close-up of his wrist, which only appeared in the First Jimmy Timmy Power Hour.
* He appears in the mobile game Nickelodeon Pixel Town (only available in Singapore, Malaysia, and the Philippines), you can get him if you merge Sam from Danny Phantom and Kraang from Teenage Mutant Ninja Turtles in the memory center.
* He usually wears a red shirt with a neutron symbol, but in the film, he wears blue shorts and brown shoes, and in the series, he wears blue jeans and white sneakers.
* He wears number 44 on the Retroville little league team.
* His contacts on his watch are Goddard, Sheen, Carl, Nick, Libby, Jose, Angie, and Hugh.
* The creators described Jimmy Neutron as "one-third Bart Simpson, one-third Albert Einstein, and one-third Jim Carrey."
* Originally, Jimmy's name was going to be "Jonathan Quasar", but his name was changed to "James Isaac Neutron" (a name inspired by "Sir Isaac Newton" that Davis came up with while walking his dog) 'cause Nickelodeon said his original name sounded too similar to similar-sounding named characters that they didn't want him to be confused with such as "Jonny Quest" or "Captain Quasar".
* Nancy Cartwright, Pamela Adlon, and Elizabeth Daily auditioned for the voice of Jimmy Neutron before Debi Derryberry was chosen.
* Jimmy's original name was inspired by a nickname that Jonathan Alexander Davis' co-workers nicknamed him.
* Headcanon: He may would have crossover adoptive siblings.