Niles

Zero (ゼロ) is a playable character in Fire Emblem if and an ally on the Nohr Route. He is voiced by Takehito Koyasu in the Japanese version.

Profile
Originally a thief, Zero became a soldier serving prince Leon. He is incredibly sadistic and loves watching people suffer.

Trivia

 * Zero shares his Japanese voice actor, Takehito Koyasu, with Lon'qu and Validar.