Coiley.
Coiley, also known as Banebou in Japan, is a mushroom-shaped monster which can only move by making short jumps, having a single powerful spring instead of legs. It makes its first appearance at stage 30, and is the only monster who stays the same in Super Mode (he is not swapped with any other monster). It also appears in the Bust-A-Move series in the form of the orange bubble and in some games as a playable character.