
A potential workaround to characters being "badasses", and thereby not easily afraid would be putting them in situations that exploit their internal demons. Liv's backstory has a few elements along those lines (once I get to writing it), but I imagine you could work a horror around something similar. Granted, a good portion of characters don't fit the adventurer role. So I wouldn't worry about it not being scary enough.
That said, I adore Until Dawn. So I'd definitely be interested. ^^
That said, I adore Until Dawn. So I'd definitely be interested. ^^