Ace Ukiyo is the main protagonist of the Japanese tokusatsu series Kamen Rider Geats. As Kamen Rider Geats, he competes in the Desire Grand Prix, a mysterious survival game where players transform into Kamen Riders to protect the city from monstrous threats. Ace is known for his intelligence, calm demeanor, and resourcefulness. His enigmatic personality and hidden motives drive much of the story, making him a central figure in the battle between Riders and the forces threatening their world.