Shiki is the main character of the Tsukihime series. He is a kind, honest, if not slightly playful second-year high school student. He is anemic and is prone to fainting, but he tries his best to live a normal life. He has the Mystic Eyes of Death Perception (Chokushi no Magan), allowing him to see the "Lines" and "Points" that enable him to kill all things using the highly effective assassination techniques hidden in his subconscious. Despite being constantly surrounded by death he has a greater appreciation for life than most people and would never take a human life.
He acquired the Mystic Eyes of Death Perception during childhood while in the hospital, after recovering from a near death incident. He escapes his room to run away to nearby fields, and it is there that he meets the Magus Aozaki Aoko, who Shiki now refers to as Sensei. He was eventually given his signature glasses to seal the power in his eyes as a parting gift, along with unforgettable life-lessons. After leaving the hospital, he lived with the Arima family for 8 years, before being called back to the Toono Mansion by his sister Akiha; after their father passed away and she became head of the Toono family. On the day he was to return to the Mansion, while leaving school early, he notices, stalks, and "kills" the Vampire Arcueid Brunestud in a fit of insanity. He passes out because of the shock, and wakes up in the Toono Mansion later that evening, with nothing out of the ordinary. He passes the incident off as a dream, that is, until being casually greeted by the supposedly dead Arcueid on his way to school the next day. It is then, that his life begins to take a turn of events once again.
(Source: Wikipedia, Type-Moon Wikia)
