Also known as: シオン・エルトナム・アトラシア
Main heroine of Melty Blood, and the version of Sion Eltnam (Type-Moon) in Tsukihime worlds.
Born Sion Eltnam Sokaris.
If she loses herself, she will turn into a Vampire (Sion Tatari). There is also a possibility she will turn into the Dust Of Osiris in the far future. Sion also makes a guest appearance in Under Night In-Birth (named Eltnum (Under Night In-Birth)).
An alternate version of her (still going by Sokaris) exists in Fate/Grand Order.