I'm one of them. Forced transformations are something I find particularly uncomfortable.

Have to say that the doppelganger idea just sounds plain unworkable (and practically unwinnable). A number of NPC's equal to the number of players, and with an ENORMOUS comparative power advantage? The good guys are even worse off, as it's 'I am a sociopathic buffed version of you'. @_@

For the mecha one... would the giant robots get robots? :P