He 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 (｡◕‿◕｡).
Unlike Zim, GIR does not mind getting involved with typical Earth culture; on several occasions he has even admitted to loving Earth. GIR also has a strong love of Earth snacks, such as tacos, taquitos, candy, chocolate bubblegum, waffles, cupcakes, tuna, biscuits, chicken with mayonnaise, pizza, Suck Munkeys, numerous Poop products, mashed potatoes, muffins and corn. He can eat and enjoy them, despite being a robot
His favorite assignment from Zim is "monitoring Earth broadcasts" (in other words, watching TV); when doing so, he usually watches The Scary Monkey Show, which he has declared to be his "favorite show". His favorite movie is Intestines of War, which he has seen over one hundred times ("FBI Warning of Doom"). GIR is also very loyal to Zim, despite disobeying him often and mainly being a hindrance to his plans.
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GIR does not hate or dislike anyone, which contrasts very sharply with Zim, Dib and especially Gaz. He instead approaches everything in the world, living or not, with boundless affection and enthusiasm.
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.
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.
GIR also seems to possess the uncanny ability of bending others to his will as he was able to make Zim dance in the elevator of the base during "Invasion of the Idiot Dog Brain" and more surprisingly, Gaz in "Tak: The Hideous New Girl."
Bad qualities
A majority of the merchandise focuses on GIR, and there is not much merchandise for the other characters. :C