Ace is initially a villain in Twinbee Yahoo. He helps Archduke Nonsense imprison Princess Melody and attempts to destroy Twinbee when he tries to rescue her. He flies a large, red ship called the Shooting Star, which has a charging beam laser and multi-directional firing capabilities. He's not a bad guy though, and seems fairly apologetic about the whole thing. Once he realises Warumon is behind Nonsense's coup, he reverts to the side of good and prevents the evil doctor from escaping. He's also a playable character in Sexy Parodius, in which he gets to exercise his baser instincts.