En Oyashiro

Oyashiro has beige hair, a moustache, a goatee, and violet eyes. His clothing consists of a baggy light brown tunic that is decorated with green and khaki stripes along each hem, underneath which he wears a teal shirt and pale green pants. He dons a red headband under his hair and large diamond-shaped sunglasses. Oyashiro also wears a pink bangle around his right wrist and a pair of plain flip flops on his feet.

As a member of the Chinoike clan, Oyashiro lived in the Valley of Hell with his wife and daughter, Chino. Although their clan had been able to live in the valley peacefully for many years, being constantly in such close proximity to each other eventually caused disagreements between clansmen to erupt into violence; only Oyashiro and Chino survived. Oyashiro regretted his role in the deaths of his clan, especially his wife's, and wished for Chino to grow up to be better than he was. To that end, he took advantage of Chino's young age by concealing his relationship to her, instead telling her that he had her entire family killed so that she would become the last possessor of the Ketsuryūgan, and thus a valuable commodity. Oyashiro took Chino from the Valley of Hell and started making a career for himself as an arms dealer. He trained Chino to be a combination of bodyguard and means to resolving "business disputes". He also began collecting young children with kekkei genkai such as Fūshin, adding them to his bodyguard retinue and providing them the care they needed. After a few years in Oyashiro's service, Fūshin fled with Chino and the other children in his collection; although Oyashiro claimed to feel betrayed, he was glad that they were forging out on their own. Fūshin went on to form the Lightning Group, which targeted Oyashiro a number of times and forced him to withdraw from public appearances, instead sticking to his various secret hideouts. He would still sometimes attend the Coliseum when he learned of a kekkei genkai user competing there, hoping to win them for himself.