Ghost (Wario Land 4)

Yūrei (幽霊 or ゆうれい), known in English as Captain Coin, is an enemy in the Game Boy Advance game Wario Land 4. It only appears in the level Crescent Moon Village. Yūrei cannot be attacked or defeated by Wario, explaining its ghost-like appearance. In fact, it can't hurt Wario either. It only steals Keyzer, the ghost that Wario needs every level in order to advance through the game and lose change on the ground. It will steal any type of coin, but will not steal gems or coins that float in the air. Yūrei only appears in the giant sections of Cresent Moon Village.

Trivia

 * Its name refers to figures in Japanese folklore that are analogous to Western legends of ghosts.