Tsubakiri Momomiya is a Momotaro researcher that works under the Momotaro Clan. His mission is to annihilate those who carry the Oni in their blood. He has a wife and a daughter.

A mature man about average height with Platinum Blonde hair parted on the left side of his head with two tufts of hair sticking out the top of his head, usually seen with a smirk and an almost smug expression on his face at all times. Adorned with the Momo corporation uniform of a white suit with black vertical lines and high knee sneakers.

Tsubakiri was uncaring to other people after an Oni killed his parents, even when his parents died he felt relieved. After meeting Manaka Momobe and his family, he has become more open and caring toward other people.