I love this idea! I've always wanted to play with a mirror universe plot.

never_felt_better: Mirror!John would be a very dangerous man. He's already almost destroyed the universe multiple times, and that's as one of the good guys. He'd have no sense of humor or compassion, a brilliant mind, and the capabilities to make wormhole weapons that can wipe out whole planets. ... Oh god, John would basically be Darth Vader? No, it isn't true!

ikissdhimbck: Kissin' Kate Barlow already toes the line between good and wicked. I imagine her mirror universe counterpart a leather-clad Harley-riding leader of a biker gang, prone to hard drinking and hard living. She helps disadvantaged kids at the Y every weekend, though.

stark_spangled: It's breaking my brain a little trying to think of a mirror universe Steve Rogers. He could end up like Johann Schmidt, or the super soldier Hodges would have made had Colonel Philips had his way. I think, mostly, mirror universe Steve would have no sense of self, no compulsion to help others, probably living out a life completely under the radar in some small apartment in Brooklyn. I might have to think more on this, though.

and_she_waited: Mirror universe Amelia Pond would be amazing, full stop. Still ballsy, brassy, less likely to rely on the Doctor and more likely to be the Doctor. She'd steal the TARDIS and have amazing adventures in space. With Rory, of course.

What do you guys think? I'm open to other interpretations, too!

(Mirror Universe Me would be a successful author with the ability to control people's minds through the sheer beauty of my powerful prose, muahahahaaaaa. I would have regular teas with JK Rowling, Stephen King, and Chuck Wendig. Yes good.)