A.J. (The Fairly OddParents)

A.J. is one of the secondary characters in The Fairly OddParents. He is one of Timmy's two best friends along with Chester. A.J. is smart and rich but is not very good at social skills, and as a result, he is considered an unpopular kid like his two friends.

Why He's An Intelligent And Good Friend

 * 1) A.J. is considered a super genius by his friends. He is the only student that seems to ever pass tests in Mr. Crocker's class.
 * 2) In his house, it is revealed that he has a secret laboratory that he keeps hidden from his parents, the lab even has a clone of A.J. floating in a vat of liquid. Whenever his parents come into his room, A.J. flips a light switch and his room turns back into a normal boy's room. This is more-or-less similar to Dexter from Dexter's Laboratory.
 * 3) A.J. is so intelligent that the government has sought him out for his technical assistance. It has also been seen that he can make anything out of anything, as he created a time machine out of yarn and paper clips, in "Teacher's Pet".
 * 4) His friendship with Timmy and Chester is good.
 * 5) Despite his intelligence being the signature of his character, A.J. enjoys other things that kids his age enjoy, such as video games and comics books as much as Chester and Timmy do.
 * 6) A.J. is a fan of Crimson Chin and Crash Nebula, although he seems to prefer Crash Nebula more and sometimes argues with Chester over who is better.
 * 7) The most significant episode concerning Timmy's and A.J.'s friendship was in season 2's "Smarty Pants'.
 * 8) Chester is A.J.'s other best friend, and the two are more commonly seen together rather than as individuals. Chester and A.J. had a temporary spat when they could not agree on whether the Crimson Chin or Crash Nebula was the better superhero, with A.J. being a big fan of Crash Nebula. Eventually, they teamed up to save Timmy at the end and renewed their friendship.

Bad Qualities

 * 1) He often flaunts his intelligence to the point of arrogance, which causes tension between him and his friends. Depending on your view, it can also make him more-or-less of a Gary Stu.
 * 2) After Season 8 ended, he was dropped from the show aside from a handful of non-speaking background cameos and appearances in the first live-action film, as well as one single line spoken by him in both "Dimmsdale Tales" and "Girly Squirrely" (albeit, by a different voice actor), and he would be heard screaming in his last speaking role in "Birthday Battle".