Lovecraft themed Killer
So I recognize this particular idea would need heaps of tweaking to get right, but what started out as a personal desire for a Shoggoth themed dredge skin kind of turned into a big daydream about a map manipulation killer who's special power is about altering the interqctable environment. For example:
Generator shuffle - the ability to target a generator and have the equal value of it's progress redistributed to multiple different incomplete generators. Eg: killer finds gen at 50%, it can target that generator, 0% it, but the 50% gets transfered to other generators at random. The plus side is the survivors have to find other generators to work on, the minus is you don't actually regress anything, it just makes the other generators that much closer to being complete. As an added risk, if the killer targets a generator that is currently being worked on, the survivor working on it gets teleported to a different random generator also without interrupting their work.
Pallet shuffle - the ability to target an undropped pallet and "trade" it's place with an already broken or already dropped pallet. (This may prove to be overpowered, but luckily there would be lots of ways to tweak it into the sweet spot like changing the targeting range or requiring the killer to stand still, etc.)
I'm sure there are lots of other things you could introduce with a theme like this, but I think it'd be a fresh kind of ability that hasn't been explored yet. Not to mention that Lovecraft is one of the horror genre classics.