Tyranno Kenzan

ティラノ剣山, The Sergeant, Sarge
He is a Ra Yellow Duelist who enters Duel Academy in the second year. To his surprise he was assigned to the Ra Yellow dorm despite scoring high on the Duel Academy entry exam due to the fact that he did not attend an associated preparatory school. He begins to develop a fascination for Judai after losing in a duel to the latter and subsequently moves into the Slifer Red Dorm replacing Hayato as Judai and Shos roommate.