The sub-plots and twists aren't what concern me, hat concerns me is making an original rp, a really original rp.
The idea has to be accessable but good enough to attract veterans, no small feat. . .. .
I like Lectori's idea of blurring the lines of one side and another. Perhaps completely adandoning Good and Evil, each side having done both great and terrible things. . .make it so it really is a deep moral dilema, that way the story is deep enough for vets if they make it so, and if newbies don;t want to it can be very simple for them. . . see?