Paizo's pathfinder adventure path has introduced two new shapeshifting types, the Faceless Stalkers and the Totenmaske. The latter is particularly creepy, as it drains flesh away (con damage) and thereafter can assume the shape of that person. It also can drain memories with it's bite to gain a better understanding of how to mimic them, and can warp the flesh of others to horrific effect (imagine going unconcious during a fight, only to wake up and realize that your ears, eyes, and mouth have been sealed shut with your own skin!).