Mr. Gorper
One of the members of the Fresh Start Club at 668 Elm Street. He was introduced to Windle Poons during Reaper Man, but it was never made clear quite what he was. Given that every other member of the club was either dead or a child of the night, it's not likely that Mr Gorper was fully human, though it'd be a bad idea to meet him on a dark night just to find out what he was...