A young, 12-year-old orphan and the lead player of the Leptons. He is bright, cheerful, and optimistic, but will lose his patience when things don't go as planned. He looks up to Gaz, and though he seems oblivious to her indifference to him, he eventually realizes her flaws and tries to bring out the best in her. Ace is revealed to be descended from the Ballmasters who fought in the Rad Wars; he can become one by fusing with Babyball and can change forms while doing so.