Always wanted to pitch an arena Rp called: The Multiverse Games (needs a better name) that takes place in the universe that is Roleplay Guild. Players can take characters from any roleplay they've made an character for a play them in an ever changing arena. But this is never just a brawl, it could be a survival game, a tourney,  a mystery to solve. Its ever changing, and doesn't require some superpower character to play. Never thought it could work.