My least favourite would be Ezreal. He just looks like some kind of retarded pokemon trainer who shoots lazers off his glove.
Hate laning against blitzcrank, because they always manage to get these magic grabs that somehow miss all the minions and hit you at max range...
And I hate laning with Blitzcrank because it's almost always my friend playing it, and he just doesn't shoot the fist the right way...
In general I dislike Karthus, Corki, Soraka (especially when the previous two are in a lane together) and uh... Udyr. I hate it when he is my opposing jungler. I can't really counterpick him, and he his just obnoxious. Oh and those are all I dislike playing against.
Hmm, never thought about olaf. He would certainly win in a duel, so it would make the udyr less inclined to counter jungle. I may have to try that.
That's a risky game lol. They have very similar clear speeds, though udyr is more likely to gank because well, shyvana ganks aren't all that great. So I guess you could use that time to try to counter jungle him? The easiest way would probably be to ward the red and blue camp though. I guess you're more likely to catch him off guard at the red camp since the mid would likely be at blue.