Rin Okumura

It begins as the story of a seemingly normal boy who lives with his twin brother Yukio Okumura and his adoptive father, the exorcist Shiro Fujimoto. Rin has always been a troublemaker, getting into fights and not fitting in well at school, but deep down he just wants to find his place. Everything changes when he discovers the truth: he is Satan's son. Satan tries to use him as a vessel to cross over to the human world, causing immense chaos. In that confrontation, Shiro sacrifices himself to stop him, and his death profoundly affects Rin. From that point on, Rin decides he doesn't want to follow the destiny imposed upon him by his origins. Instead, he makes a difficult decision: to become an exorcist to defeat Satan. To achieve this, he enrolls at True Cross Academy along with Yukio, who turns out to be his teacher.

He has an athletic build, neither overly muscular nor weak, more like someone active who fights often. His height is average to tall for his age, and he usually has a somewhat relaxed, almost carefree posture. His hair is black, short, and slightly messy, giving him a rebellious air. His eyes are normally blue, but when he uses his demonic powers they become more intense and bright, drastically changing his expression. His most distinctive feature appears when he unleashes his demonic side: horns grow, his ears become pointed, and he has a black tail, in addition to the characteristic blue flames that surround him. These flames are like his personal trademark and make him look much more imposing.

He's very emotional and impulsive, easily swayed by his feelings and often acting without thinking, which gets him into trouble frequently. Even so, he has a very good heart, is incredibly loyal and protective of the people he loves, especially his brother Yukio Okumura. Although he tries to appear strong, he actually carries many insecurities due to his background. He worries about not fitting in or being rejected, and this sometimes makes him react with anger or frustration. He's not the brightest academically and can be somewhat clumsy, but he's very sincere, direct, and never pretends to be someone he's not.