This RP is based off a story I wrote a long time ago about a boy who escaped his bleak reality by finding asylum inside his dreams. I think the concept would scale well to having multiple characters, especially since the planned sequel to that story would have done just that. 

So all of the players would be kids, teens at the oldest, who all go to the same school or to schools in the same close area. The characters would be completely normal kids during the day, going to school, dealing with family, hanging out with friends, all that jazz. The real fun, and the core of the story, is when they fall asleep. You would be playing as a child who experiences lucid dreaming, which means they are aware that they are dreaming. Beyond that, each is capable of controlling their dreams, essentially becoming an omnipotent god until they wake. Yes, you heard it right: Omnipotent. Anything you want, anything at all, you can create inside their dreamspace. Whip yourself up some futuristic starships or throw together your very own non-Euclidean Lovecraftian world; be a wizard like Hairy Pothead or swim in cold fire or blow bubbles into stars; emulate reality or shred the rule book and scatter the pieces. 

The very beginning will most likely feature very little character interaction beyond seeing each other in school or if your characters are friends, allowing time to establish who your character is and what it is they do inside their dreams. What really marks the beginning of the story is the first contact: when one player enters into another's dreamspace. 

Would they assume it just another part of the dream? Would they recognize a stranger tearing through their world? For that matter, would their dream appearance even match their waking one? Would they tell anyone else in the waking world about their dreams? And what would happen to the mind if two omnipotent gods battled it out inside one's head? [s]All this and more in the next anticlimactic episode of Dragon Ball Z![/s] 

I'd leave everything after opening that Pandora's box up to you. Whether you end up killing each other to protect your clashing realities, or if you end up banding together to become the keepers of a whole knew reality is up to you. Every once in a while there may be an unforeseeable event thrown in to rattle the cages, but not often. 

If you'd be interested in an RP were you change from an impotent child to an omnipotent god and back again with a turn of the moon, let me know. I'm very willing to take in any and all feedback and suggestions to make an RP that is fun for everyone.