Sasuke for me. I like him for a bunch a reasons. Firstly for his demeanor and mentality. He is calm cool and collected. He rarely gets flustered, and even when he does, he is still badass. He has a one track mind. When he sets his mind on a goal, there is no changing his mind. He has his priorities straight, and I've especially liked him more after his meeting with the hokages. He is asking the questions that need to be asked, and he now has control over his emotions.
My favorite thing about him is his mind. His ingenuity and innovation, his intellect. He is just a really smart guy, and I dislike idiotic characters. Then there is his fighting style which makes use of his intelligence, Kirin and his chidori variants are just cool, and they show just how ingenious he is. I have to admit though while I like his fighting style, it his character as a whole that I like. His tragic past, and how he is suffering, made me fall in love with his character.