Drillun

Drillun is an enemy that was planned to appear in Mega Man: Dr. Wily's Revenge, but it was removed from the game before its release. In an early version of the game, three Drillun enemies appear in the Wily Station after a room that was apparently intended for Picopico-kun. These invincible enemies move up and down to drill Mega Man. Mega Man can stand on them briefly before taking damage.