Some things are meant to be left mysterious. Boscoe isn't a man, he's a shadowy force of nature and trying to pigeon hole him into any category is bound to be useless. You can't contain him with even a list of generalizations. As such, he doesn't exist in our world. His realm is the illusive quantum one where he is only bound to the heisenberg uncertainty principle. You can measure his speed or position, but not both. At almost 13.5K posts, his effect on our world only grows stronger even as his identity becomes less and less attainable.
To know the Boscoe is to know one's self. I'd like to think there is a little Boscoe in all of us.