I'm thinking about playing a grumpy, somewhat stoic character who's recently been having really vivid and trippy nightmares, and because of this, she (or he, possibly) has been trying to forego sleep at night and taking short naps in the middle of the day. Whether you want to use that a trait as basis or tool for an arc, it's up to you.

Plus, she's already going to have an interest in the occult. Possibly a little on the goth side XD