Usually referred to as Hiruma, he is a protagonist and the major driving force of the plot of Eyeshield 21.
At the beginning of the series, he witnesses Sena Kobayakawa's running abilities and forces the boy to join the team as the ace running back and hides his identity during games by having him use the codename "Eyeshield 21".
He captains and plays quarterback for their team but also serves the duties of a coach, as the team lacks one. He is responsible for arranging all of the Devil Bats' matches between the Spring and Fall Tournaments and also devises the majority of the team's practice sessions.

Source:Wikipedia