Natassia (Episode G - Assassin)

Natassia (ナターシャ, Natāsha) is the adopted daughter of Hyōga, she is an amalgam of several dead bodies created by the leader of the Faceless, Wadatsumi who used her body as a container for his liquid form but also served to deceive his opponents into not attacking.

History
"Natasia" was created by Wadatsumi as an amalgam of several dead bodies to be used as a container for his liquid form.

Story
After the defeat of the leader of the Faceless, Wadatsumi by Aquarius Hyoga, with his technique Diamond Dust, Hyoga encased the girl's body with Freezing Coffin. Later, after the fight, she left the Freezing Coffin, feeling scared and cold, with no recollection of what happened, since she lost her memory. She asked for her papa, and Hyoga hugged her, telling her that he was there. She then asked him what her name is, to which he replied, "Natasha"--having given her his mother's name.