Assassin (Fate/Grand Order - Shuten-douji)

Assassin (アサシン) is the Assassin-class Servant able to be summoned by the Protagonist in the Grand Orders of Fate/Grand Order.

Identity
Assassin's True Name is (酒呑童子) is one of Japan's Three Great Monsters, killed by  and his "", which included Sakata Kintoki. She, in the form of a beautiful girl, met Kintoki, who then fell in love with her. They used foul play in killing Shuten-douji, which Kintoki greatly regretted to the point of wanting to wish for Shuten-douji's revival to meet her once again.