I'm not entire sure what these "hollow men" you're referring to are, but we don't have very many supernatural entities, no. I've told you before that we have alchemy, which you've mentioned as being close to what you consider magic, and that's...reasonably common, to some extent; when it comes to purely supernatural beings, however, there were only eight of them in the world that I know of - all very powerful, incredibly formidable beings, capable of things that most humans wouldn't believe if they were told.

At the time that I was brought here, I've verified that two of them are dead. I don't know the whereabouts of four of them, but I assume they're also deceased; one of them has been nullified as a threat, I believe, and I have it on good authority that the final one is killed sometime in the near future.