Domino
I know I'm stating the obvious, but Domino is such a messed up champ. As far as I have been able to find, there is no counter at all for the degeneration she puts on you. I understand there are certain fighting styles you can try to "minimize" the damage she gives you, but that isn't really a counter. There should be some way that skill or some champs can counter her, and there is not. Even Tech champ have little benefit against her, even though they are said to never be unlucky against her. I'm sure there are people out there who will argue against me simply because they want or have her for AW defense, but she is not right. She should be corrected.