Main heroine of [[Melty Blood]].

Born Sion Eltnam Sokaris (シオン・エルトナム・ソカリス).

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 [[Sion Eltnam Sokaris |Sokaris]]) exists in [[Fate/Grand Order]].
シオン・エルトナム・アトラシア