ZIM

Zim is the villain protagonist from the series, Invader Zim, on Nickelodeon.

Origin
Zim is an alien from Planet Irk who was not well-respected, due to his small stature. He lost all trust from his fellow invaders when he botched an invasion mission, and wound up destroying a part of Irk. Hoping to get rid of him, his superiors sent him away with a defected robot that dubbed itself Gir to a secluded area of space on a fake invasion mission, hoping he would never find his way back. Unfortunately, Zim found Earth and thought it was his mission to conquer it.

Throughout the series Zim tries many roundabout ways of taking over the Earth. But he has to wear a human costume with contacts and a wig, which all but his archnemesis Dib fall for. The series follows his (and sometimes Dib's) odd antics, from stuffing himself with human organs to avoid being revealed to the school nurse or getting a job at a fast food company.

Zim is an intense megalomaniac, and often speaks in the third person. He hates humans and all things related to them.

Goals and Ambitions
Zim wants nothing more than to take over Earth, and impress his superiors. It was originally intended that he take over Earth and become the Tallest, but the series was canceled before that could happen. Creator Jhonen Vasquez stated that Zim (and the 3 other main characters) aren't factually evil.

Trivia

 * Despite that at first he was not proved to be a truly evil character, he crossed the Moral Event Horizon in more than two ocassions: Harvesting the organs of innocent school children, ripping out the eyeballs of a child who merely desired his friendship, experamenting on (and subsequently killing) the class pet, and, upon killing his arch rival slowly and over many years using time-travel technology, he calls him a "foolish earth creature", and walks away while drinking a soda. Said rival is revived almost immediately, but Zim wasn't aware of this at the time.