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Yukio Okumura
Yukio is the twin brother of Rin Okumura.
He's very good academically, and he dreams of becoming a doctor someday.
He's been studying to become an exorcist since he was 7, in order to protect Rin Okumura, and at the age of 13 he became the youngest person to ever gain the title of exorcist.
When he was young, he was a crybaby, but at 15 years of age, he's become strong and cool.
He's so level-headed that, watching the anime, it's difficult to tell whether Rin Okumura or Yukio is the older brother.
Watching the fourth episode of the anime, I thought, "Yukio is like the older brother!" Pay special attention to the exchanges between Yukio and Rin Okumura.