A long, long time ago, she was once a mortal Delphox when she experimented on a potion that would give her immortality. However, the potion exploded in which killed her, but her dreams came true when she inhaled the fumes of so-said experiment, in which allows her spirit to live on as a ghost.

Anyway, she is Fire/Ghost type, with her Tera type being Poison, as a way to reflect the incident with the potion, but instead of using a stick as signature weapon, she uses a dual-sided staff with crescent symbols on it alongside some ghostly flames on it.

By the way, she nowadays work as a teacher specializing in History and Science.