Baku is the hero of this series. He is aggressive, ambitious, and reckless and is chosen as the successor of En, the strongest Great Child. He becomes the Great Child of "Primas," the 1st world in the Twelve-World. He is amazingly powerful, and although he does not have a license as a Great Child, his ambition is to be strong enough to conquer the world. Baku is confident to be a better fighter than En. Baku's Spirit is "Jibaku-kun."