GIR

"I don't know!"

- GIR when Zim asked what the "G" in his name stood for.

GIR is the insane, hyperactive robotic assistant of Zim and the closest thing the incompetent Irken 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).

GIR is voiced by Rosearik Rikki Simons, and played a main role in three episodes: "Invasion of the Idiot Dog Brain", "Walk of Doom" and "GIR Goes Crazy and Stuff", and played minor or secondary roles in almost all other episodes. He was voiced by Wasabi Mizuta in the Japanese dub and Irwin Daayán in the Spanish dub.

GIR is happy-go-lucky and extremely hyperactive, and will eat just about anything, regardless of whether it is edible or not. Most of the time he spouts nonsense, but does have a few, short moments of clarity: for instance, in "Walk for Your Lives" he actually contemplated whether making the explosion go faster would make things worse ("But if the big 'splody goes fast, won't it get all bad?"), and in "Bad, Bad Rubber Piggy" he questioned the wisdom of sending a machine into the past to destroy Dib.

GIR usually fools around when Zim gives an order, and always goes right back to what he was doing before once he has completed the order (which is only done occasionally) or, more often, when Zim leaves. Zim has described GIR's intelligence as "bad"; indeed, the little robot is often one of the many reasons why Zim's plans frequently fail. GIR has also been known to disobey orders whenever it conflicts with getting something he wants, such as rubber piggies or food.

Zim has taken advantage of GIR's poor intelligence in the past, having once attached GIR to a power amplifier in "Plague of Babies" to incapacitate Sergeant Shnooky and his underlings with an amplified wave of the little robot's stupidity. However, despite his stupidity, GIR also has shown an occasional manipulative side, having used his antics in the past to bend others to his will.