I've got a nice idea for a new neutral killing role. A neutral killing role is quite important as there is usually a SK in every single setup (at least in Europe), and it's always a SK which is a bit boring.
My Role Suggestion:
Stalking Rapist (maybe pick another name for him)
Every SECOND NIGHT*, the Stalking Rapist is able to kill someone (person A) AND he will also kill the person which was targeted by person A. I believe that this will add some interesting gameplay mechanics to the game, as this will also serve to provide hints for the town. Maybe you have to figure out a nice message at the beginning of the next day (maybe not telling which one of them was which role, just stating names + roles, and that's it)
*Every Second Night: Because otherwise its too strong cause most people can target someone at night, this means that 2 people die per night, hence he can only do it every second night