There are 3 points to a good RP: Plot, OCs, and RPers. Plot is always a nice one, and fantasy settings work the best IMO. OCs are good only when original, like a anthro animal OTHER than a cat or wolf, or a demon that isn't edgy and humanlike. But, even with the best made plot and OCs possible, the RP sucks if all you get is some 8 year olds who can't RP at all.