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 Lily's death along with the rest of the Red Arrows. (Source: One Piece wikia)

The Straw Hat crew obtain an advertisement for a recreational island on the Grand Line run by the Baron Omatsuri. Luffy decides to take this opportunity to kick back and relax. Unfortunately, when they arrive at the island, they are asked to compete in contests through unity for access to relaxation. However, there seems to be a mysterious air on the island, as the Straw Hat Pirates begin to fight amongst themselves, while Robin, Chopper, and Luffy individually search for the secret behind Baron Omatsuri's island.<br><br>
(Source: Anime News Network)