I don't think any champion has no counter play but some of them just seem like they don't or are unfun to play against
Renekton can abuse you too much if you misstep the slightest bit which isn't really fun
Mundo can just Q from range in lane and scale up for teamfights, ofc you can just build grievous wounds vs him late and mid but his early is just so oppressive. There should be a larger tradeoff for using q to farm because playing against him is basically like playing against a ranged champion that also has the benefits of being tanky that melee champions have.
If you don't have CC Trynd can just stomp your team and splitpush which isn't fun. He also doesn't have any mechanics that you can really dodge.
Wukong isn't fun to play against too because you also can't really dodge anything.
Pyke can sustain poke just by walking a little bit out of lane and coming back. He can basically just fish for Q's and if he gets punished for it he can go out of vision and heal it all back.
Darius imo has the illusion of counterplay. Even though they added the timer and range indicator before Q theres really not many champions that can dash out or react as quickly. Walking away from it basically does nothing because he can just walk also. This combined with the fact that he can slow and also pull you in with e basically means that he shouldn't really miss it most of the time.
Riven is the most irritating thing to play against because if you're not tanky or don't have movement spells she basically can 100-0 you with a single combo at level 6. I usually take exhaust against her just because I don't want to misstep a little and have her e r then proceed to fast combo me and ult me to death.
I main Akali but she's also so annoying to play against. The amount of times I am able to 2v1 toplane are insane. Shroud is just too powerful in skirmishes. I really enjoy the rework but sometimes I really feel bad when I can just w and e to get out of a gank. Most of the time unless you're fighting someone and have low energy you can just escape with no big deal.