Taemin, hands down. He used to be ashamed of his feminine looks, telling people not to call him 'pretty' and trying his best to portray the most masculine version of himself in his first two solo albums.
Fast-forward to Move, and he's openly embracing his androgynous looks, speaking about his genderless concept in interviews, and embracing makeup as a form of creative expression (rather than something thrust upon him by Kpop). I will never blame him for feeling uncomfortable with the way he was feminized, considering all the shit effeminate men have to go through, but I'm so proud of him for embracing that part of himself.
And hey, he's used it to create one of the most iconic artist personas in Kpop, so it's a win-win.