Fortuna Fallen, despite her name, is the ill-fated daughter of Anima and Heather Fallen. When she was born, her mother was a Vampire, but her father was Human, meaning Fortuna is unstable. She had series of health issues directly related to this when she was born and through her first year. Concern for her united the degrading family, if only for a while. When her grandfather drugged her food with Vampirocilin, her Human half rejected the chemical, stabilizing her. However, she desires nothing more than completing herself, either as a human or vampire. The vampirocilin only works for so long, and when it wears off, Fortuna will destabilize, possibly making her condition worse than before or even killing her, which is why she desires completion so badly.
Etymology: Fortuna is Latin for 'fate' or 'fortune'.