Series: Shakugan no Shana
The male lead of the series -- despite the notable handicap of dying in the first episode. An ordinary guy who's stuck with the all-powerful Reiji Maigo inside him, making him a huge target.
Love interest of both Shana and Yoshida Kazumi (and maybe Konoe Fumina); classmate and friend of Ike Hayato, Tanaka Eita, Satou Keisaku, and Ogata Matake. Becomes much less of a victim over time. Shana is the star of the series, but it's basically Yuuji's story.
See also Sairei no Hebi (warning: major spoilers).