It is unknown if he is a Heroic Spirit Candidate, Wraith, Phantom, or some other subset of spirit. It is for that reason he is manifested as a Pseudo-Servant in a suitable human body. Muramasa claims that he is not qualified to be a Heroic Spirit because as a blacksmith, he lacks the heroic deeds necessary to make him a hero. There were stories about his Katana that killed Tokugawa Ieyasu's grandfather, there's also one that Nobuyasu used to commit suicide, and there’s also one that actually cut Ieyasu himself. Legend says that he has forged a demon sword that antagonizes the Tokugawa clan.

Muramasa is a famed blacksmith within Ise Province. They are working in tangent with the seven Crypters attempting to supplant the Greater History of Man with the Lostbelts. He is also summoned as Alter Ego, working as one of the apostles of the Alien God in the Lostbelts.

Senji Muramasa, Class Name Saber, is a Saber-class Pseudo-Servant summoned by Ritsuka Fujimaru in the Grand Orders of Fate/Grand Order. Because he is summoned in Shirou's body he bears the same appearance as Limited/Zero Over Shirou.

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