Muchigoro is a member of the Red Arrow Pirates who appeared in the sixth One Piece movie. In the movie he participated in the first Trial of Hell issued by the Baron Omatsuri against the Straw Hats in which they had to catch his giant goldfish Rozalio. After being defeated Nami tried to get information out of him that night when he suddenly withered and died. After Lily was fed again he came back to life but he turned back into a plant root after Lilys death along with the rest of the Red Arrows. Source: One Piece wikia