Hirarian 427 (ヒラリアン４２７ Hirarian 427?) are exploding enemies. In Mega Man 5, they stay latched onto the ceiling until Mega Man approaches, and then fall and race towards him. They can be destroyed with a normal shot from the Mega Buster, but if they are dodged, they will simply continue "running" until they explode. They appear in Stone Man's Stage (and in Mega Man for the Game Gear), the first and third sections of Proto Man's Castle, and the second section of Dr. Wily's Stage.