Willy

Willy (ウィリー, Wirī) is a character from the fourth One Piece movie. He is a Orca Fishman and the Captain of a crew of Fishmen that compete in the Dead End Race. He is an old rival of Arlong. He is last seen about to battle with Gasparde and his crew. The outcome is never seen however. But since there appeared to be no damage from Gasparde's ship it can be assumed that Willy & his pirates were probably defeated by Gasparde's pirates. He is surprisingly insightful, managing to realize that Gasparde rigged the race when he sees the former marine sail off the main course. His weapon of choice was a Morning Star.

Trivia

 * While Fishmen are essentially fish they are mammals, Willy on the other hand is an Orca which is a sea-mammal, although dolphins and whales are commonly mistaken for fish. This is also a curious note as this makes him the only fishman to date who is a full mammal and not actually a "fish".
 * His name may refer to 1993 film Free Willy which was about freeing the Killer Whale "Willy" (played by the killer whale Keiko) from captivity. Cultural references based on this film are common throughout the world.