Champions that you refuse to play for X reason

Does anyone else have one or more champion that they will never play? As for me I do, I hate so much I refuse to play her no matter what. I never once had fun while playing against an Irelia which is what brought this belief on me, I will never make 5 person suffer the pain of playing against Irelia.

I also have a pretty good mention to as a laner, laning against nasus is like being in prison You must always stay in lane as to stop Nasus from farming and getting ahead. That's not fun.... I do play him as a jungler for the thrill with friends though.