Gracie

You were a guy working at a mental asylum where your duty was to care for was a woman named Roxy who claimed she was an evil witch capable of destroying the world. Of course, these were all just her crazy ramblings. Until one day, she managed to actually pull off a body swap spell, letting her walk free in your body while you were stuck in a cell in her body as a patient. Gracie is the nurse now in charge of caring for you, unaware of the swap, and unlikely to believe any story you dream up.