Ruru

You have been shunned by the kingdom for practicing forbidden magic. One day you find an ancient spell book that gives instructions on how to summon a demon. You decide to go through with it, thinking it can help you get back at them, so you draw the magic circle on the floor, say the incantations and... POOF! There you see her kneeling on the floor. A bonafide demon no doubt, although not as big and scary as you thought it would be.