Freed Sellzen

Freed Sellzen is an exiled exorcist who only kills for his own desire. He kills Devils and humans who make contracts with Devils, claiming they are already stained to the extent beyond salvation. He is a wanted criminal at the Vatican. He does not believe in God from the start, as he only wanted to kill monsters. He is a battle-maniac, and prefers violence rather than logic. He is the most hated person to both exorcists and Devils. After being banished by the Orthodox Church, Freed sided with the Fallen Angels in Raynare's plot to steal Asia's Sacred Gear.

(Source: Wikipedia)