Yukio Okumura

Yukio Okumura is one of the main protagonists in Ao No Exorcist. He is Rin's younger twin brother. A straight arrow and kind-hearted by nature, his goal is to become a Doctor. Unbeknown to his brother, he is a brilliant Exorcist - the youngest in history - in short, a genius. His abilities are gradually unveiled during his time at the Exorcism Cram School and is now an Exorcist teacher.

Personality
Yukio is mostly seen as quiet and calm, yet he is somewhat bi-polar. He is usually seen happily smiling, but can easily get sidetracked due to Rin's personality clash, and becomes rather dark. He takes things seriously, but knows a joke when he hears one.