Tony Stark. We tend to forget that the arc reactor housing is literally fused to his ribcage now, as in YINSEN HAD TO SAW OUT HIS STERNUM (without decent painkillers or sterile working conditions, and they probably can't go back and fix it up because messing with the baseplate too much could kill him). I think Tony deserves some credit for not being more messed up than he is. I mean, wow. He should be taking it easy on a beach somewhere for the rest of his life.