MAN is an unnamed, faceless (covered with a mask) 40 year old something man who takes pleasure in tormenting and eventually killing his victims, the guests at his motel, the group in this scenario. He's witty and sarcastic. He gives out a psycho vibe, something that resembles that of the Joker. 

IN ORDER TO PERFECTLY PICTURE THE MAN'S PERSONALITY, PLEASE WATCH AND TRY TO REINACT THE FOLLOWING SCENE FROM AMERICAN PSYCHO: https://www.youtube.com/watch?v=2roY6G8LbPg