I like your champion choices for the most part, but I'll come up with my own:
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Singed: this mother fucker's entire playstyle revolves around NOT fighting you, but rather, running past you and then running away, forever. It's the most un-interactive bullshit ever.
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Malzahar: Because the only counterplay to point-and-click should not be to buy an item that is only efficient for AD characters to actually buy.
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Caitlyn: because if I'm playing safely and smartly under my tower I should be able to farm without playing hop-scotch with her fucking bear-traps.
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Lee Sin: Because he is supposed to be the epitomy of skill expression, but ever since some jackass figured out the R->Q1->Q2 combo (or Q1->R->Q2) it stopped taking any skill at all to burst enemy squishies with him.
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Yasuo: because he gets so much more agency than his opponents because of having 2 spammable basic spells one of which has 2 (or 4?) different forms. Also his kit places too high a burden of knowledge and skill on the opponent in order to out play him. This makes it so that he becomes useless at high level play because those people can handle that burden, and makes him OP at low level play because casual players can not handle that burden.
Dis-honorable mentions:
Teemo: His mushrooms have no counterplay except for "pray to baron that you don't step on one" because you have no way of knowing if he placed them somewhere. And don't give me that crap about how trinkets make up for this. Realistically you have to save trinkets to clear wards near objectives or to clear out wards in lane so that your jungler can gank. You ain't going to be blowing that trinket cooldown just to check a random place in-between objectives.
Bard: Because his poke is absolutely disgusting early game, and he can somehow provide both poke and sustain, making far too god at zoning me off of farm even when I'm far back and playing passively.
Katarina: When she gets her daggers right she is way too fucking mobile. You can blow EVERYTHING and still get caught and killed by her. If you sacrifice all your summoners plus use every one of your skills defensively, you should be able to at least escape death against an opponent. That sacrifice of putting yourself at a disadvantage for the near future by blowing multiple long cooldowns shouldn't be for nothing.
Master Yi: He's a stat-stick / stat-check who's only counter play pick is Crowd Control. If you don't have CC then you're fucked.
Zilean: 99% slow feels so unfair. And it takes all of the skill-requirement out of landing his double-Q combo.
Vi: I main Vi. The way her ultimate works is extremely unfair for her opponents. I feel so bad for squishies that I catch with it (except maybe teemo, that little bastard deserves every ounce of suffering - if I had my way, every time Teemo was picked in a game he would get matched against 5 of the other champions I've listed in this comment).
Edit: I have one more - Twitch: Because he does everything Rengar was reworked to prevent, except better.
Frustrating gameplay, Makes no sense, lost for identity, dont remember winning lane against this guy and by winning lane i literally mean coming out of lane 4-0 while still being confident i can fight him, Does more damage 0-5 then a 5-0 adc.
Abuses items in the game not ment for him. Lane bully + Huge asset to team no matter if behind or fed. Frustrating. Too much shoved into his kit with paragraphs for explanations. Idiotic champ.
Should not be a build that works. Abuses items not ment for him. Frustrating gameplay, One Q chunks your health. Voids assassins, Cant 1v1 him as any other adc because his item path is so stupid.
Supporting never got easier and more braindead.
Playerbase is too childish. FIlled with little kids that flame all day.
Just annoying to play against, especially in my elo where people don't know how to play against him and he is able to just free farm minions for 20 minutes and then free farm me and my team for the next 5-10 minutes.
