Zim or Invader Zim, the title character of the cartoon, Invader ZIM is a short Irken defective, that despite his size feels that he is superior to and unchallenged by the other Irkens and universal creatures, due to his intelligence, ingenuity, skill in many applications, and destructively inclined nature. This seems to imply that he suffers from a Napoleon complex. He can be a very irritable, impatient, anger-driven, and sometimes accident prone character, but enjoys a good snack and loves to invent and create new things. Jhonen Vasquez, the creator of the show, states in an IGN interview: "I always imagined Zim as just being utterly unaware of his shortcomings, to a dangerous extent even. He's not really stupid, but he's got some problems getting priorities straight. He's this alien from an incredibly advanced race (technologically anyhow), with access to a universe of power. And yet he stays in school all day, enduring it, hating it, fearing it and freaking out about it. The thought of sneaking out or setting a robot in his place never crosses his mind. He gets so caught up with the most unimportant details, he ends up getting nothing done; He gets a giant robot, and his plan is to go beat Dib up. It was cool to remind people that he really was in control of some impressive stuff, but that his sense of control was so horrible that it didn't matter if his plans were foolproof."
In the first episode, The Nightmare Begins, he is the new kid in Skool and Dib, the most hated kid in Skool, tries to prove he's an alien but fails. And after Skool, he gets into a battle with Dib all over the town and eventually calls GIR for help. They very quickly fly home on GIR's jet pack-like gadget. He walks in and says smiling: "I feel good about how today went". As he talks with the Almighty Tallest, he surprises them (they think he had died) by appearing on their screen and explains about Earth and his mission as GIR falls on his head and the episode ends.
Many of the Invader Zim episodes feature the "Angry/Scary Monkey Show", which GIR loves and Zim hates.
All Irkens, including Zim, do not have families or relatives. This fact is proven in the episode, "Parent Teacher Night," and shows Zim as having been created in an Irken birthing facility, and removed from an incubation cylinder by nothing more than a "cold, unfeeling robot arm." They all also have no human organs, but they have a "squeedily spooch", an all purpose organ, mentioned in the episode Dark Harvest.
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Official Site: Nickelodeon
Links: Zim Wikipedia page Invader Zim Wikipedia page Invader Zim imdb page