Ki Ou is the former Secretary of the Department of Royal Commandment Affairs. He has a similar personality to Kouki Ki's but he is much more dominant compared to him. He has the qualities of a worthy king. He is very far sighted and quick minded and is able to handle even the worst of situations calmly. He can be both kind and cold at the same time. He is considered a possible rival of Ryuuki for the throne.
It is later revealed that his actual name is Ki Sou, a direct descendant of first emperor Gen Sou and true heir of the throne. He has been in league with Yosei Shou to recover the throne. As revealed by Yosei Shou, Ryuuki's actual task was to be the emperor successfully for three years and he has fulfilled it. Revealing this shocking truth that he has been using Ryuuki, he joins Ki Ou's faction. Ki Ou has a daughter named Hien Ou (Hien Sou) who was sent to the Hyou clan for his benefit. Ki Ou deeply despised emperor Senka Shi. The reason was his sister's death. Ki Ou's older sister was the previous Black Wolf and she died in her service to Senka. Due to that reason, when Ki Ou sees Shuurei suffer for Ryuuki he feels pained as it reminds him of his sister's demise. After failing his invasion for the throne, he is still shown as an official in Ryuuki's service implying his actions were forgiven.
