Not having full knowledge of 'Late Night with the Devil', it's hard to determine the main characters precisely. But in a true - story context, if it involves a late - night and devil - related plot, the main characters might be those who are central to the events. For example, if it was a late - night interview situation gone wrong and related to the devil, the interviewer and the interviewee could be main characters. Or if it was a group of people exploring a haunted place at night and had devil - like experiences, those in the group would be the main characters.