I would like to expand on your Idea, El_Tigre. Lets say the RP takes place in a city (I will refer to this city as city X) City X happens to be a sort of hub for paladins, containing a large number of them, while the shades are spread thin. Over time, though, the shades began to group up, eventually forming a sort of reincarnating gang within City X, which is a problem for Paladins.

So the bulk of the RP would be the shabbily structured gang of shades against the tight-knit community of paladins within City X. Of course, the goal of the shades is to rid themselves of the paladins, so they can live their eternities of crime and chaos in "Peace"

also, it would be cool if we could play as the reincarnated forms of real criminals. (OBVIOUS THING IS OBVIOUS)