Angels
I've known several Michaels, one or two Raphaels, but I've never met a Gabriel.
A tall biker guy in black leather and Persol sunglasses.
Demons
A mall cop that wasn't what he seemed to be.
For a time in my childhood, I would see black figures out of the corners of my eyes. Soon after, someone near and dear to me would pass away. The figures would disappear.