An honest politician.
I kid, I kid. (Maybe.) I realize the question is for standard mythological creatures.
Dragons, probably. Blame Anne McCaffery and being a goth, but I’ve always had a special spot in my heart for the scaly beasts. I fully believe they were real physical beings at some point, and that they exist on the astral plane now — but that if they so chose they could become physical again. Just, you know, what’s the point? Everyone trying to kill them, pollution, no more wild places in the world…no wonder they went astral.