Who is the Most OP Character?

I am so curious about who the most OP character is in your eyes? Not someone who is annoying to play against, like Zed, but someone who you genuinely feel is op. Mine is either Darius or Yasuo. I def think Yasuo takes the cake over Darius. He is a perfect character. His passive is legit a perfect offense and defense. His one and three do so much base damage along with scaling so well with crit, he is somewhat naturally tanky and his 2 needs no commenting. I mean come on, it is legit is Braun shield but way better. His ult really is the only balanced thing about him.

Sure, he is not the easiest character to use, but a character that is slightly challenging, or even very challenging, does not create an excuse to be op. I at least know I am not the only person to feel this way, but I cannot fathom why they have not changed him yet. Anyway, who is the most op in your opinion and why?