Monstro

Monstro is an enormous whale from Pinocchio and is featured in Kingdom Hearts and Kingdom Hearts: Chain of Memories. Monstro is not a world unto himself and thus has no keyhole. Rather, his belly is large enough to serve as a substitute world, filled with luminescent acid, blubber, and Heartless. Monstro swims through the dimensional rift between worlds as if it were water, attacking and swallowing any vessel that passes his way. Monstro escaped from the world of Geppetto and Pinocchio just before it was destroyed by the Heartless. Geppetto finds himself inside Monstro's belly while searching for his "son", Pinocchio. Monstro's anatomically disoriented insides consist of two major parts. His enormous mouth contains many of the ships he has swallowed over the years, including Geppetto's. His throat leads to his Heartless-filled intestines, which are a sickly purple color with vessels and valves separating the body cavities.