Yukio Okumura (奥村 雪男 Okumura Yukio)

Yukio Okumura is Rin's younger twin brother. When it was discovered that the woman impregnated by Satan was going to have twins, it was believed that Satan's powers would be split between them. Due to the weakness of Yukio's body, however, he did not inherit any of Satan's powers, thus being born fully human with the full extent of Satan's powers going to Rin.[ch. 1] Yukio did, however, receive a spirit wound at birth from his brother, which allowed him to be aware of demons for as long as he can remember. Yukio secretly trained to become an Exorcist from the age of seven in order to protect Rin through the help of Fujimoto. While both Yukio and Rin are in their first year at True Cross Academy, Yukio is already an instructor at the Exorcist cram school teaching Anti-Demon Pharmacology to Rin's class.[ch. 2]

It is often stated that Yukio is considered a prodigy, having already acquired the title "Meister" in both the Dragoon and Doctor class, while ordinarily most people would aim for Meister in only one class (both are still fully qualified exorcists). He is currently ranked a Middle First class exorcist. Even though he and Rin argue a lot, and he shows resentment for Rin at times, Yukio truly cares about his brother. Fearing Rin will be consumed by his demonic nature, Yukio often berates him for his impulsive actions and reckless attitude. Later on in the anime, he becomes a demon (as well as being possessed by Satan himself) just like his brother. In the manga, he gains "Satan's eyes", though it is unknown what this ability entails. He is voiced by Jun Fukuyama in Japanese[1] and by Johnny Yong Bosch in English, while in VOMIC he is voiced by Ryūichi Kijima.[2] In the Blue Exorcistmusical, he was portrayed by Kimito Totani.[3]