The hero of this series. Aggressive, ambitious and reckless. Bucky is chosen as the successor of Spaak, the strongest Great Child and becomes the Great Child of "Primas", the first land in the Twelve-World. He is amazingly powerful although he does not have a license as a Great Child. His ambition is to be strong enough to conquer the world. He is confident to be a better fighter than Spaak. Bucky's Spirit is "Jibac."