My bias in EXO is Tao, and it's been like that ever since I saw the third teaser. He turned out to be completely different from what I expected him to be, but that makes me love him even more. Second and third favorites are Baekhyun and Kai. heart
I actually like D.O a little bit more than Kris because I have a soft spot for guys that take the motherly role in groups. Plus, his adorable facial expressions have completely won me over. Of course, Kris is great too. He has the type of personality that is definitely perfect for being the leader, and he's been cared for others even before he received the position.
I can definitely understand why a lot of people can't choose a bias in EXO. They're all really likable!