Yes! I have seen:
a Hat Man
a humanoid shaped one without a hat
a fleeting black figure out of the corner of my eye
a short, plump, long pointed-nosed, hat wearing "shadow troll" as I like to call it
and one that might have been more of a ghost, but it was a large black mass that floated by. That one "haunted" a movie theater I used to work at and was seen by a few other people too, on multiple occasions.
Oh and one time I was at a cemetery with 2 other people and we were basically told to leave by whatever was there, but what we could see were two black shadow dogs, possibly demon dogs. But they were just all black and silhouette-like from what we saw.
The Hat Man though, that one was amazing.