Itomimizu

Itomimizu (イトミミズ) is the announcer and commentator of the Davy Back Fight events. He is often seen riding a very large bird named Chuchuun to get a better view of the action. His name means tubifex worm, leading to many fans referring to him as simply 'Tubifex'.
First Appearance: Chapter 306;

(Source: One Piece Wikia)