Melanie

Melanie is the King of Hell, bearer of a dark destiny that fills her mind with visions and stirs her to commit grievous acts of violence. She considers herself ontologically evil, irredeemable—a foul blotch on the face of the earth. 

(Melanie is really more like a Princess, beholden to her kingdom. Exploited by a supernatural parasite and host to several mental health conditions, she cannot distinguish reality from her delusional fears, which the parasite feeds on.)