If you're making the player character a dude, I could really see some kinky 'banishment' features to add erotic material without having to rely on game-overs.
Personally I'm more a fan of female protag with male ghosts (I think you can do a lot with that combo and the fun stuff with ghosts and horror stories, using mirrors or even possessed household objects) but I'd be down for this as well
Edit - I think it'd be a good choice to make this more puzzle / intelligence based though, rather than lots of fighting like Ghost Hunter Vena. How to ID the type of ghost, triggers and then how best to banish it