What is wrong with your main
I believe that it is fundamentally impossible to actually call a champion perfect. So to all the mains/otp's..... What is wrong with your champ, what are the fundamental issues of your champ, not built in weakness by design although that may sometimes overlap with something that is a foundational weakness.
Many times we can very easily get opinions on a champs issues from the perspective coming more from people against the champ, which would easily be the majority of most post complaining about a champ. I am sure a few current outliers are going to be easy to point out, but there are always the more niche champs that can end up being ignored by the meta complaint thread since they aren't seen as often.
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Too perfectly outrageous.
makes it so she needs to do 143% damage to execute a target
, which was the ONLY AP + HP item that wasnt gated by some effect nidalee couldnt use very well AND also gave a form of CC which although nidalee couldnt make use of herself (as if she landed the spear she could already close the gap and there was no other way to really proc it) ... the runic proc would allow it to pounce to the enemy team and help in teamfight
Not enough tails.
needs to have his E range normalized. That way his E can be around 850 standard. His e is either too short and will get him killed without Xayah or allows him to escape the dumbest situations if he is with her. At the very least allow teammates to see his E range indicator so they know how close they need to stay to him.
A Q so easy to dodge, and if you miss, then you've already lost the 1v1. God bless this E rework though.
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The in-game model is outdated and horrifying.
A supportive carry. You CAN carry, but if you don't get fed early, or if you get even a little behind before 6 you basically have to rely on your team. Not exactly a bad thing, unless your team is composed of various fruits and vegetables instead of actual players.
no longer is an assassin.
with Windspeakers. I wasn't a fan of the CDR change to her ult, but after playing with it, its barely even there early on and at rank 3 it lets you do more in fights, which I like. But I wouldn't be opposed to having it reverted in favor of something else.
Way too vulnerable to cc in lategame teamfights. With the current triple on hit meta build he has no burst whatsoever as his alpha strike damage falls off hard lategame. Other carries like 
have some sort of cc and/or high burst damage so that if they get blown up they'd at least go 1 for 1. Since YI Isn't meant to have cc in his kit it'd be nice if he's somehow resilient to it. A good start would be reworking his W into an instant cast spellshield so coupling it would his Q can be really rewarding if used properly, and crit Yi would be relevant in that regard, least he wouldn't have to rely on shitty items like EoN or Scimitar that do not synergize with his kit whatsoever to teamfight.
- Fear's tether time before fearing is way too long. Considering he has to 'get up in there' to do the fear it is kind of stupid considering how much safe point and click insta CC there is in the game. It takes someone to really not be paying attention for the fear to go off and since it is his only CC it is a huge part of his kit. The magic damage on it should be reduced, maybe even the duration, from (1.25 to 2.25) to (.75 to 1.5).
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not as good as Yasuo's wall ;-;
can hardly do much in a teamfight after blowing her Ultimate
is useless if GW is applied or has no AP
can't go over walls with his hook (Some people thought he could in a few of my past games and I got flamed for not hooking the shaco over the wall)
is limited by his attack speed and shroom placements.
got reworked. made me force to play differently. and still, I can't seem to do it. :S