Yomi

Yomi was a comrade of Youko Kurama in the past. They raided many demonic castles, together with their thieves guild. Contrary to Youko Kurama's cool and calculating personality, Yomi was brash and hot-headed. He enjoyed the act of killing and had no sense of honor, particularly to his fallen comrades. One night, in one of Yomi's raids, his group was ambushed by a wasp-like demon. The assassin killed all the thieves but Yomi, who was badly wounded. As a result, he was blinded by the assassin's attack. Fortunately for him, he stabbed the demon and he flew away. With his eyes gone, he became helpless and he fell to a near cliff and collapsed. However, he never gave up. He embraced his disability and used it to his advantage. He harnessed his spiritual powers and grew 4 pairs of ears as his "eyes." When he achieved the status of an S-Class demon, he hunted down the assassin and kept him in a locked room, where he was tortured and dismembered him while he was still alive.