Kiritsugu Emiya

Known as the notorious "Magus Killer," this ruthless freelancer specialized in hunting heretical mages using a lethal blend of modern firearms and ancient magecraft. Though he spent a turbulent childhood fleeing the Mage's Association alongside his father, he eventually became the adoptive father of Shirou Emiya after saving him from the Fuyuki fire. Driven by a tragic, disillusioned quest to become a Hero of Justice, he embraced a heavy burden of sin to protect humanity.