Kylo Ren needs to die because he's killed Han Solo, obviously. Imperial officers in the original trilogy didn't really get cool death scenes, but I'm kind of hoping that for Hux at some point. Snoke needs to go with a batshit, crazy cartoonish death. That's the only way. I do want Phasma to live, even though that's unlikely and that she'll probably get a boring offscreen death eh...

Rey and Finn are bound to make it out alive, but I wonder who they're going to kill in the Resistance. I think Poe would be an interesting choice, or maybe Chewie or Leia. Although to be honest the whole outright genocide thing they had going on with the destruction of the Hosnian system was a nice touch, I wouldn't be opposed to the same kind of large scale destruction to assert FO as the bad guys instead of them killing more main characters. Or maybe both, because I am terrible.