"I'm not your weapon; Demon King or savior! I'm Rin Okumura! And when I'm done, I'm going to be the best Exorcist you ever laid your eyes on!"
The son of Satan and the elder, fraternal twin brother of Yukio Okumura. Studying as an Exwire at True Cross Academy, Rin desires to earn a Knight Meister and defeat his biological father.
Rin has a protective and supportive personality. He can be very violent and tends to get into fights (which are usually caused by strong emotions) but is actually kindhearted. He supports his friends and tries to encourage and help them. He also seems very protective of Yukio, and aims to surpass him one day. Rin is clueless at times, such as saying phrases wrong or thinking that the Kraken's fins are ears. Despite this, he is able to connect with someone's feelings to his own, such as Shiemi Moriyama's grief over her grandmother and Ryuji Suguro's ambition to defeat Satan. He's not the type of person for school or studying, though he was able to gain a junior high diploma and become an Exwire. (aonoexorcist.wikia.com)