History: The Sinister Six's main adversary, nemesis and enemy. Also born in the same time period as the six themselves, but he was under the power of the Devious Dr. Wily. He is known as being Dr. Wily's most ingenious (and deadly) creations. After Wily's countless losses to Mega Man, the Yellow Devil grew intelligent and took a vile twist by destroying Dr. Wily's lab. Then left to start its own mission, to destroy all who oppose his power. The Yellow Devil has gone through many incarnations over the years, each time becoming smarter, and stronger. With only "evil" intensions implanted in its brain module, his only purpose in life is to destroy it, sadly enough.

Powers: This giant is composed of material that can split itself into smaller pieces that can fly around on their own. Also his body is made of a special ooze liquid that allows it to take the many shapes and forms. The entire body is controlled by a small brain module that usually hides inside the body and comes out to make visual contact with its surroundings, and to strike its target with an attack. This brain module is the sole weak point of Super Chaos.