Mozuku (criminal)

is presumably the leader of the gang of the Mokuzu Island.

Background
He and his group stay hidden under the island and wait for the ship to sink using various mechanisms.

Adventure at Sea Arc
Situated on Mokuzu Island, he tried to steal the valuables from the ship of Naruto, Guy, Aoba, and Yamato, but with the help of Shikamaru and Tenten, they managed to defeat him and his gang.