Tyrannosaurus

Tyrannosaurus (ティラノサウルス, Tiranosaurusu) is the name of a small mouse that Iceburg found and took care of. Its name probably comes from the pose it maintains, standing on the rear legs like a Tyrannosaurus Rex.

Appearance
Tyrannosaurus is a small, white mouse, with a long tail and a cheerful look on his face. Most of the time he stands on his rear legs, keeping his front legs before him in a standard mouse pose, that probably gave him his name.

Personality
Tyrannosaurus spends most of his time lying in Iceburg's pocket, and squeaking happily when his master caresses him. He's apparently very loyal and attached to Iceburg, as he's always seen with him: even during the arson of Galley-La Company's HQ, instead of running away, he remained by his master's side, trying to wake him up with his squeaks in order to save him.