Duo appears in Megaman 8 and Megaman power battle. He's very strong but of course not stronger than megaman. He was made by a unknown person or thing. He saves megaman in Megaman 8. Megaman is getting crushed by a huge robot Dr.wily made and he comes and cuts off his arm and megaman gets free. He doesn't have a gun he attacks with himself! He turns into a human blue fireball and flies at his oppenents. Later on he becomes good friends with Megaman.
