Char Man is the person near Harry the Hunter and the Green Man. He also was next to Adam Maitland when they sat down in the waiting room as well. It's possible he died from smoking in bed, and was burned to death while asleep.
While not much is known about him, he ironically mentions trying to cut down on smoking, as stated when Adam Maitland said he didn't smoke when offered a cigarette.
'BEETLEJUICE'© Copyright 1988-2020 Warner Bros. Entertainment, Inc.