What are the main characters in invader zim?

Answer 1

Zim (Richard Steven Horvitz): Overzealous, impulsive and convinced of his own greatness, Zim is incompetent as an invader. He constantly schemes to enslave or destroy mankind and, despite his access to potent Irken technology, his plans, frequently based on misconceptions, are never successful.

GIR (Rosearik Rikki Simons): Zim's only companion, GIR is a SIR (Standard Information Retrieval) unit, an Irken standard-issue robot. He was made out of some scraps in a trash bin by The Almighty Tallest. The name "GIR" is a self-applied moniker that is never explained; GIR himself states that he doesn't know why he refers to himself as GIR. GIR differs physically from other SIR units in that his head contains odds-and-ends rather than Artificial Intelligence hardware. Because of this, GIR displays a wildly erratic personality. He is almost completely irreverent and rarely obeys Zim's commands, variously due to distraction, disinterest and disobedience. GIR disguises himself by wearing a green dog suit which fools most humans, despite looking almost nothing like an Earth dog.

Dib (Andy Berman): Zim's main opponent on Earth. He has been obsessed with the paranormal and supernatural ever since he was a baby and instantly recognizes Zim as an alien, but everyone derides him as "crazy" or "insane", including his sister and father.

Gaz (Melissa Fahn): Gaz is Dib's cynical and humorlessly sarcastic younger sister. She plays a prominent role in the show, but rarely takes an active part in attempting to hinder Zim's schemes. Though she knows and admits Zim is an alien, she believes Zim is too dumb to actually be a threat. She enjoys a very limited number of things, a few of them being Pizza and Video Games.

Almighty Tallest (Wally Wingert; Kevin McDonald): Red and Purple, collectively known as the Almighty Tallest, are the supreme emperors of the Irken race. They are united in their love of destruction, tormenting of others, snacks, puppet shows and their hatred of Zim.

Answer 2

There is no way to chose the best character from television shows, movies, books, etc. It is all subject to opinion. So there is no way to answer this question truthfully.