Let's face it, once upon a time each fairytale was pretty harsh, a land where bad things happened to the naive and to the wicked alike. This will be no different, each of you will become a young person in a dark world full of monsters and evil and will have to make a difference... on way or the other. You will each start in you Home, a small area just for your character that is safe, and will be pitted against the outside world and, sometimes, each other to thrive and survive the hardships ahead as, after all, the Happily Ever After ending need a lot of blood and effort to reach...
I'm still working this out, but I was wondering if anyone would be interested before truly starting my plotting in earnest. Each character will have at least one enemy at all time, and I'm thinking of making a currency called Wishes that would grant additional abilities, some chance to change events by doing them again and even to start over if you have enough Wishes and you're stuck. Wishes would be gained through important actions and by exploring and finding new areas.