Zim

Zim is an incompetent Irken invader who is overzealous, impulsive, and convinced of his own greatness. He dreams of regaining his leaders' trust by taking part in Operation Impending Doom II (his own incompetence led to the failure of Operation Impending Doom I), he plot to conquer the universe and enslave all races.

He is assigned to Earth, a planet which the Almighty Tallest believe has little to no chance of existing. However, against all odds, he makes it to Earth and establishes a base on a fake mission of conquest. Because of his stature, he disguises himself as a human child using a wig to cover his antennae and contact lenses to make his eyes look normal.