The decapitating halberd. Wields the sharp extra long halberd(ji) "Zanbageki" that is capable of splitting boulders. Has a difficult personality, him finding thrill and pleasure in decapitating the enemy shows his cruelty, he is known to kill surrendered enemies, prisoners-of-war and disobedient subordinates. Futhermore, he himself is in charge of performing execution. With such a dangerous character, even allies will fear him.
In the battle of Korou Fortress, he got Ten-i in a tight spot but was pushed back by Ryuubi and his group, and was later killed by the flame of Sousou, Kayuu's arrogance invited the calamity upon him.
In the 'Commander File' publication in Dengeki Hobby Magazine, it is said that Kayuu was under the Ryofu Team in his soldier days where he mastered his skills and then he got promoted as a general during the battle of Kurou Fortress.