Bass is a Robot Master created by Dr. Wily to imitate Mega Man's design, along with Treble, an imitation of Rush's design. Bass is the prominent anti-hero of the original Mega Man series, and his goal is to become the most powerful robot in existence. Although Bass and Mega Man are rivals, they sometimes team up. Despite being created by Dr. Wily, Bass frequently rebels against his creator.
He can shoot in 7 directions with his buster, and can only fire 4 shots at once.