There's a scene in my current WIP set in cyberspace. My main villain (Doctor Douglas) has digitized his mind and was pulling the strings from the internet. Eventually an AI (B.O.R.I.S) programmed to undo his handy-work locates the prime version of Douglas, since he's duplicated himself to run on every device on the internet. B.O.R.I.S destroys the prime Douglas, but another one downloads into his place and reveals that his deletion automatically summons a replacement. In a change of tactics, B.O.R.I.S exchanges virtual bodies with the new prime Douglas to gain his authorization codes. But my question is this; how should I refer to my characters once they've swapped bodies? I'm thinking of referring to them based on their appearance, but would this confuse some of the readers? Would they wonder why the good guy is now doing bad things and vice-versa? I know some readers like a challenge, but I don't want to put off casual readers. I suppose if they're paying attention it's not that difficult to follow.