He is voiced by Junichi Suwabe in the Japanese Version and Brandon Potter in the English Version.
He was an infamous yokai that has been living for at least 600 years. He worked with Tomoe, wreaking havoc to the world. They were unstoppable until Tomoe fell in love with the human Yukiji. After being captured, he was sent to Yomi-no-Kuni and lived there for a long time until the soul of a young, recently deceased, boy named Kirihito Mori came to him and asked him to send an apology to his parents because they had fought just before his death. Akura-Ou accepted out of boredom and curiosity and hence took up the boy's body, waking in a hospital room and being hugged by "his" mother. After some time, Akura-Ou regained some of his followers despite being in Kirihito's body. Two of which were two cat-masked shikigami. He soon decided he wanted to get his original body back from Yomi-no-Kuni. Kayako fell in love with him sometime after and he used her to try to get into the God's Summit. When she failed, he left her, finding her no longer useful.