Well, for world... For the sake of the first few posts, I'll put the story in the woods beside a small town somewhere up North. You don't have to assume any state or country in particular, since I don't have any real timeline for WHEN the apocalypse happened, so the world could be very different in this roleplay than it is in real life. If people would like to branch out from the woods near the town later, then feel free to suggest places.
For the plot, this is essentially a survival roleplay. Your character's goal is to survive. Both human and non-human alike. If one of your characters dies, they are perma-dead. No resurrection. But you CAN make a new character. Also, for all characters, no matter what species, NO GODMODDING. If your character is human and gets hit with a crowbar, they are going to be severely injured, and you have to roleplay their injuries. If need be, I WILL become Game Master and force people to roleplay their injuries, but I'm hoping I don't have to do that and people can moderate themselves.
Powers that Monsters CANNOT have: nothing weird like laser vision, no weather control, no flying, no controlling gravity, essentially nothing that doesn't play off of what humans would already have.
Powers that Monsters CAN have: super-strength, super-speed, that kind of thing. When deciding what kind of power(s) you want your Monster character to have, tell me first and I'll either okay it or tell you that you need to come up with a different power.