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.

History
Tyrannosaurus is always seen together with Iceburg, so of course he appeared the first time in his pocket, when Mikazuki was bothering Paulie at Dock 1, before being defeated by him and the other carpenters alongside his crew. During Iceburg's convalescence, he was always by his side, standing on his bed. Later, during the arson of the company's HQ at the hands of the CP9, instead of running away, he tried to wake up Iceburg, without success. He, alongside his master and Paulie, was fortunately saved by Chopper, and he spent all his others appearances together with Galley-La's president. He was last seen during Iceburg's audition for a new secretary, on the Cover of Chapter 487, lying as usual in his master's pocket.