Braveheart

Braveheart is an unofficial member of both The Left Fist and The Right Fist
He is a white, anthropomorphic mouse or rat - standing about 2 feet tall when standing up on his hind two legs
He can alter his size downward from two feet tall down to the size of a small city rat. And he can assume to appearance of a normal city rat - thus effectively hiding in plain sight.
He is intelligent (although not brilliant)
He is sneaky and he can cast some spells
He is a Rogue so he can get sneak attacks
He is able to turn invisible (using a ring of invisibility) and sneak into very tight places (as a mouse would)
He is brave and he is honorable