Not a demon, no. But I've met a small number of devils. You'd be surprised at what people have and haven't met.

( There's a difference. And Crowly doesn't look like any demon she's aware of, so she chalks it up from being from a different world altogether, and not just one of the planes. Still, the corner of her mouth twitches up into a smile. )

Haelva. Wizard of the school of Necromancy, and still not a vampire. Though I am sorry to disappoint.