Tyrannosaurus

This small white mouse has red eyes, a lengthy bald tail, and a look of permanent cheer. It often rises onto its hind legs with its forepaws lifted, a stance evoking a Tyrannosaurus Rex and most likely the source of its name. Once the two-year gap had passed, it sported a tiny pinstriped jacket over a dark shirt paired with a light tie.

The mouse spends the bulk of its time tucked into Iceburg's breast pocket, squeaking with delight whenever he pets it. Its attachment to him is profound, and the two are almost inseparable. When flames swept the Galley-La headquarters, it would not run, instead clinging to its senseless master and squeaking desperately to wake and rescue him.

Tyrannosaurus turns up wherever Iceburg goes. It first surfaced inside his pocket as Mikazuki pestered Paulie at Dock 1, just before the carpenters routed that troublemaker and his crew. Once introduced to the Straw Hat Pirates, Iceburg remarked that he had lately adopted the mouse and dubbed it Tyrannosaurus, then asked Kalifa to supply rodent feed and a cage, which she had already arranged. It kept watch at his bedside throughout his recovery, and amid the CP9's arson it strove fruitlessly to rouse him until Tony Tony Chopper carried the three of them out. In later years it remained with Iceburg and his secretary Alice, sitting in his pocket when Franky's fresh bounty poster arrived in Water 7, and perching on Alice's head as she set up Vegapunk's global broadcast.