I've seen it too! Shows up between midnight and 5am ish but disappears when you get close. I can see him from the shop. Not sure what can be done with/about him though.
If anyone knows of anything that can be done with/to him please tell me =)
That which is spoken of here has no yet implemented purpose that I know of, it was just something interesting that was added, I guess, tested mechanics, so to say.
The "black swirling cloud person" Has no yet implemented purpose, that I know of, It has none of the crystals, and cannot be interacted with in any way, aside from forcing it to disappear by approaching it.
