GIR

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.

Appearance
The only differences between GIR and regular SIR units are the unique coloration of the luminous parts of GIR's body (teal instead of red, although they do go red when he is serious), a different configuration for the eyes, and his cross-hatched mouth. The similarities in construction suggest that the components from which he was built came from an out-of-date model of SIR unit.

GIR's usual Earth disguise consists of a green "mongoose-dog" suit with a zipper on the stomach, and a head that can be pulled over like a hood. It also includes a small tail that he is inexplicably capable of wagging like a human dog's. The large eyes sometimes blink while at other times, they do not. Also, the mouth will sometimes open when he speaks, whereas other times it stays closed.

Personality
GIR is happy-go-lucky, enthusiastic, energetic, excitable, 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.

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.

Unlike Zim, GIR does not mind getting involved with typical Earth culture; on several occasions he has even admitted to loving Earth. Despite his sub-par disguises, GIR is actually quite good at blending in with the humans, due to his behavior and intelligence being similar to theirs in some way. Example of this is him befriending people like Mabel, Star Butterfly, and Greg. He has even befriended monsters and aliens such as Papyrus and Wander.