The sidekick of the Barbarian, Minsc, who famously “goes for the eyes!”
Boo is described in the game text thusly:
Boo is a fuzzy little hamster. While Minsc believes Boo is a miniature giant space hamster, you are rather certain that the tiny rodent is just a normal hamster.
Looking for authoritative source settling Boo’s species: is he really a miniature giant space hamster, or is he just a normal hamster?