Shuten-Douji

Due to her anecdotes and vestiges she is classified as an antihero. Assassins True Name is Shuten Douji one of Japans Three Great Monsters. In the Heian Era Shuten was the king of Mount Ooe who was a commander of many fearsome demons. There are many origin stories surrounding Shuten Douji. One goes that she was born on Mount Ibuki to YamatanoOrochi and a human girl another says she descended as the Dragon King Kuzuryuus godsend. But no matter what she is the child of a dragon god: something she shares in common with a certain Sakata Kintoki. Just like in the past she lives nowadays as she feels like behaving to her hearts content. In addition she is also a collector of antiques and rarities showing a keen interest in the red dragons ulna dwelling on Kintokis arm. It seems that she attaches importance on rarity and the elegance of the appearance as such she is incompatible with the King of Heroes who stresses performance and history. Source: Fate/Grand Order Wiki