Rider is from the popular anime series, Fate/Stay Night. Rider?s true is Medusa, the Grogon from Greek mythology. She is the rider-class servant in the Fifth Holy Grail War in the series. The Medusa materialized in the Fifth Holy Grail War appears differently to her legend. She appears to be in her human form, unlike her legend where she has snake for her hairs, she has long purple hair.