Hyouma Sagara

Little is known about Sagara's background, but it is known that before becoming a master he was born from a lineage of magi that was commonly looked down upon as "rats". Before the Great Holy Grail War, he was living with a prostitute by the name of Reika Rikudou, who was unaware of the existence of Magecraft, and at some point in time he managed to gain possession of Jack the Ripper's knives.