Ryuu Yuu is one of the squad leaders of the Hi Shin Unit. Later, a 100-men unit commander in Hi Shin Army.
Lost Instantly in an arm-wrestling contest to Den Yuu.
He is good at using sword, spear. He is a veteran soldier. Outside of combat, he is apparently good at cooking and can work alongside Ka Ryo Ten in feeding large groups of people.
- He called Ryuu Sen a pig and proceded to get decimated by him in an arm wresteling match.