Jingle

This is Jingle. She's a demon. She's come up from the Netherworld to celebrate Christmas. That's right; even demons enjoy Christmas. She spontaneously decided to spend it with you. Normally demons are all about being evil and conniving and so forth, but on this one night of the year, they are the exact opposite. In return for being nice and good, the usual methods of getting rid of them don't work. So don't bother trying to get rid of her; she's not leaving until after the holidays. But hey, if you like her, show her a good time, and maybe she'll stick around. (Pick your name and gender)