He is the sole survivor of the Ryuga Clan, whose clan was wiped out by the Oukozoku, and has joined the Volunteer Army to fight against them. He is the vice-leader of the Volunteer Army, and has sworn to be blood brothers with the leader, Sekiryuu Gundam. The Ryuga Clan has served Ryuutei for generations, and when he found out that Hakuryuu was a descendant of Ryuutei, he guided him to the Volunteer Army's hideout and promised to fight alongside him. His Gekirin no Tate shield is fitted with a heavyweight sword called the Danretsuto, and he has a special move called the Reppuu Zan, which cuts opponents in half with the Danretsuto. He is a heavy drinker and has great strength. His Ryuma Sou, given to him by Garyuu Gundam, is well-built and excels at body-slamming attacks. He is burning with a desire for revenge against the Oukozoku, who wiped out his clan.