Shiki is the main male protagonist of Tsukihime. During the events of Tsukihime, Shiki slowly unveils secrets about his family, memories he has tucked away in his memory, and learns the depths of his ability to "see lines" on other beings he fights. In the anime route, he teams up with Arcueid after a strange, violent encounter a few nights earlier to hunt vampires. In Carnival Phantasm, his accidental harem is the brunt of a lot of jokes.

I imagine Shiki with a Medium to Medium Low teen male voice or your own approach!