I would love to see Phoenix Wright based RP, but the amount of work it would require to make it work probably would be staggering. But yeah, I can dream I guess ;).

EDIT: Anything League of Legends roleplay based would be something I could dig in as well :D. Medieval version of Power Rangers/Magical girl (Mechas made out of bricks/stone/wood ? :D) would be amusing to see as well.