Demon Hakkai

From the manga/ anime Saiyuki

Biography: Three years before the present time of this story, his name was Cho Gonou and he was in love with a woman named Kanan. However, Kanan was abducted to be taken to Hyakugan Maoh, a powerful demon that likes to toy with beautiful women and then eat them when he grows bored with them. Gonou became enraged and went on a murderous killing spree, massacring any and all demons even remotely related to the abduction. He finally finds Kanan, but she takes his dagger and kills herself after revealing to him that Hyakugan Maoh's child is already growing inside of her. By this time, Gonou has become a demon, because he has killed over 1000 demons

theres a part in the comic where he rips out his left eye and throws it at some guy Its so fuckin funy