Rider (Fate/Grand Order - Dahut)

Rider (ライダー) is a Rider-class Servant appearing in the Grand Orders of Fate/Grand Order. She is given the title Rider of Ys (イースのライダー)

Identity
Rider's True Name is (ダユー), the Pirate Princess of Ys.

Dahut is an existence similar to a Phantom that cannot manifest as a Servant, so Scheherazade used her Noble Phantasm in conjunction with the power of Phenex to modify Francis Drake's Saint Graph to make her take on the role.