Onnotangu

Onnatangu was the original moon. He was the husband of Amaterasu and the father of the Kami. The Nothing that created the universe whispered in his ear and drove him to madness, and he then devoured all his children but Hantei. Hantei later challenged him and cut his brothers and sisters from Onnatangu's belly.

At the end of the Hidden Emperor arc, he was replaced by Hitomi after she defeated him in a duel.