Melvin Sneedly (Captain Underpants)

Melvin Sneedly is a character and one of the main antagonists from the Captain Underpants franchise. He is one of the only kids in the series that has no humor. In the film adaptation, he is voiced by Jordan Peele (known for Key and Peele, Wendell and Wild, Us, MadTV, Get Out, Nope, Big Mouth and Toy Story 4), while in The Epic Tales of Captain Underpants, he is voiced by Jorge Diaz.

Why He’s Intentionally Immature
Note: This applies to all of Melvin's incarnations.
 * 1) The main problem with him is that he is a spoiled young scientist kid who dislikes George and Harold for pulling pranks at school.
 * 2) He always (and annoyingly) snitches on any classmate for any reason.
 * 3) He hates having fun, unlike the other kids.
 * 4) * In fact, he even tried to cancel Halloween and later make it illegal.
 * 5) He is no better in the 6th book where he goes as far as to verbally treat Sulu, his test subject hamster very poorly, while trying to create a machine to fuse with a robot so that he can have strength, but however, he later ended turning himself into robotic booger creature dubbed "The Bionic Booger Boy" when he was sneezing.
 * 6) He was also extremely unlikable in the 7th book, as when he got Captain Underpants' powers, he starts to use it for selfish purposes, and it even almost got George, Harold, and Krupp/Captain Underpants killed.
 * 7) He is shown to be hypocritical when he says to the kids "You guys are so immature!" (his catchphrase) despite the fact that he can be immature at times.
 * 8) * Speaking of his catchphrase, it is very annoying.
 * 9) He is also shown to break promises when George and Harold made the Invention Convention cancelled, he tattled on them to Mr. Krupp.
 * 10) He is a large Gary Stu and stereotypical nerd who always gets good grades, loves school, doesn't find anything funny, and always listens to the teacher.
 * 11) He's a big-time narcissist.
 * 12) He at least lacks no friends.
 * 13) He once went as far as to destroy George and Harold's treehouse. That is not only a heartless thing to do to innocent people, but it is bad for the environment and is also a waste of money and shelter.

Good Qualities

 * 1) He has common sense (e.g. deciding on survival or extra credit).
 * 2) He is correct about George and Harold at times, such as when George and Harold act odd at times and invade Melvin's privacy. He often tells Mr. Krupp on George and Harold whenever they do something bad in school (e.g. hijacking every invention except his in the Invention Convention in the 2nd book), and Melvin's dislike for George and Harold is very justified since they often cause mischief in Jerome Horwitz Elementary and disobey their teachers sometimes.
 * 3) He receives comeuppance for his sinful deeds, a good example being chased by the angry mob when Mr. Krupp was in his body in the 7th book, and getting spanked by Sulu in the 6th book.
 * 4) Melvin chose to save George and Harold in the Season 2 finale of the TV series since he didn’t want to become a monster like his future self.
 * 5) He hates Halloween because he was not invited, so he helped out and apologized in the end.
 * 6) In all fairness, he's certainly supposed to be disliked since he is an obnoxious snitch and big-time narcissist (most of the time, anyway).
 * 7) Like the other Dav Pikey characters, he has a memorable design.
 * 8) Jordan Peele and Jorge Diaz both did it right when voicing him.