FEAR is an apt comparison. Sinister and Surreal seem likely to join him in the realm of the footnoted and forgotten icons.
The icons work when they fit into easily recognized social types and "borrow" from preexisting cultural products. This allows the casual guest to understand them without much effort and provides creative with a firm foundation on which to individualize and elaborate them with backstory for the more dedicated fans. Jack and Chance are clowns with a heavy debt to Joker and Harley. Oddfellow is a ringmaster and dark magician in the Facilier mode. The Usher, the Storyteller, the Caretaker, the Director - they're instantly understandable. Even Eddie (the slasher) and Cindy (the creepy little girl) work this way. Sinister and Surreal, like FEAR and the Terra Queen, don't.