Margin Heart (マージンハート, Mājinhāto) is an individual possessing extreme powers beyond the realms of imagination. Once a shinigami blessed with hollow powers, he died after his zanpakuto revolted against him and took control of his body. His soul then was sent to hell, creating his new body there while slowly gaining new powers and abilities.While residing in hell, he was considered the *demon among demons*, feared by many other Togabitos. His powers then became so immense that even the Kushanada wasn't able to stop him from escaping hell, even managing to obliterate one that pursued him through sheer force alone. He is the father of Asuka Heart and the husband of the deceased Yukidomari Naian Heart.