Shark Submerge 3-gou is a submarine from One Piece, not a humanoid character. It belongs to the Straw Hat Pirates and is one of the vehicles used during underwater travel, especially in the New World. Designed for deep-sea navigation and exploration, it supports the crew’s missions beneath the ocean surface. As a specialized submersible, it plays a practical role rather than a narrative one, helping the team reach submerged locations, evade enemies, and conduct underwater operations safely.