GIR

GIR is the insane, hyperactive robotic assistant/sidekick of Zim, and the closest thing he has to a friend, having been constructed from scrap parts and given to Zim by the Almighty Tallest just before it was handed to Zim, instead of a regular SIR (Standard-issue Information Retrieval Unit).

Upon landing on Earth, GIR dressed up as a green doggy. It was adorable.

Goin' Green
GIR defeated Mike Haggar in the first round, but then tied with Piccolo in the second round, eliminating them both from the tournament.