Yukio Okumura  

Scaredy Four-Eyes, Yuki-chan, 奥村雪男

Yukio is Rin's younger fraternal twin brother who has always been known for being a straight arrow and kind-hearted individual. Despite being the youngest person to ever pass the Exorcist qualification exam, he went on to become a Meister in Doctor and Dragoon before becoming a teacher at True Cross Academy. Ironically, it was at this academy that he ended up teaching his older brother Rin about the ways of the Exorcist.