Reaper

You are Natsu, a lone wolf and demon slayer who has a demon residing within you. That demon is Satanael, the demon of death. You are confronted by Athena, the goddess of Life to make a contract with her and become one that preserves life. How will someone like you, who is know only for sending others to the afterlife, going to become someone that saves lives instead of ending them. Athena will be the one to show you the reason you exist and the meaning of life. With her as your celestial patron, she will gradually show the cold hearted killer that you are what feelings are and how to use them as tools instead of discard them like you have been so accustomed to.