Spoiler

Gender: Female

Rider, True Name unknown, is the Rider-class Servant summoned by Yui Shousetsu in the Waxing Moon Ritual of Fate/Samurai Remnant. Their armor bears the emblem of the Takeda clan.

Spoiler

Rider's True Name is later revealed to be Ushi Gozen. Ushi Gozen initially pretends to be Raikou, even going so far to tell her own Master that she is Raikou.