Yukio Okumura

Yukio Okumura (奥村 雪男 Okumura Yukio) is the deuteragonist of the Blue Exorcist series. He is the son of Yuri Egin and Satan, the younger twin brother of Rin Okumura, and the adoptive son of Shiro Fujimoto. Initially believed to share Satan's power, Yukio was born fully human due to his frail body, with Rin inheriting all of their father's demonic traits. However, a spiritual wound from Rin at birth granted Yukio permanent awareness of demons. Under the tutelage of his adoptive father, Yukio became an Exorcist prodigy, achieving the rank of Meister in both Dragoon and Doctor classes when he was thirteen. In addition to his high school studies, Yukio teaches Anti-Demon Pharmacology at the True Cross Academy cram school, and has ironically ended up teaching Rin the ways of the Exorcists.