Yellow Devil

Yellow Devil (イエローデビル), also know as Rock Monster, is one of Dr. Wily's creations, that originally was a fortress boss in Mega Man 1 as a big yellow blob made of nanobots, that can dismantle himself and cross through the screen to attack enemies. His weak point is his eye, which is the controller of the nanobots. He can also shoot beams from his eye in the Mega Man: The Power Battle games.

In Mega Man: Powered Up, it is revealed that he can talk, but the only thing he can say is "Bumo".

A upgraded version of him appeared in Mega Man 3, called Yellow Devil Mark2. Mark2 can not only do the "blocks moving thing", but can also flow in a wave.

He reappeared in several other games in different forms, like: Mega Man 8 and Mega Man and Bass, as Green Devil, Mega Man V as Dark Moon. He also appeared in the X series in Mega Man X5 as Shadow Devil. It included the Fortress Boss Music and all! In Mega Man ZX, he appeared as a miniboss (except made out of magma instead of nanobots), named Lava Demon.

The "Devil" type robots

 * Yellow Devil
 * Dark Moon
 * Green Devil
 * New Yellow Devil
 * Shadow Devil
 * Rainbow Devil
 * Lava Demon