What champion can you just not play?

Well the servers are down so how about some light hearted discussion. Was thinking about this last night while playing a bot game with Vlad, and recalled all the times I tried to play him in a normal it went horribly wrong. Then there are the other champions like Graves, Kha'Zix or even Rengar that are meta junglers but I just can't find myself playing them to their potential at all.
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