Doomslayer

Intro unnamed space marine, known as the "Doom Slayer", as he battles demonic forces from Hell that have been unleashed by the Union Aerospace Corporation within their energy-mining facility on Mars. The Doom Marine was originally a human from Earth who served in the Marines and was dishonorably discharged due to assaulting his commanding officer after refusing to fire upon a crowd of unarmed civilians and was later transferred to the UAC Phobos base as security. Not much is known about Doomguy's feelings, as he is shown to be anti-social and to have a very "shoot first talk second" mentality, but it is known that he loved his pet rabbit Daisy, as he was infuriated and devastated when the demons killed her, which fueled his already-deep hatred towards demons. The demons infested earth. Doomslayer hates the mortally challenged with every fiber of his being, he's also thoughtful, willing to think about the big picture, and he cares about the lives of innocents but remains not soft at all.