Slea
Slea is a dragonoid demon born in the human realm and lives with her mother, who is not so kind to the humans that inhabit the realm.
Slea and a human boy grow up together, keeping their relationship secret from her mother, the eventually run away together where Slea takes over a human woman's body, whose soul ends up being thrown into the clutches of a fire lord, and is later then created into the angel of demon parts- Nala.
Slea lives out the rest of her days, oblivious of what she's done, with her childhood friend/husband. They have a child by the name of Symphia. Slea later dies from a strange disease created by possession of the human body she resides in, and her demon self.
This disease is later passed on to Cutts when her husband transforms into a demon via magic. He takes the form of his beloved wife, Slea, without realizing it.
The disease is altered slightly, and refuses to be the end of Cutts, it causes terrible problems for him in the future, however.