Popular champions arent always OP champions
For example in your list
Strictly for high elo
Brand is subpar ever since spellthief gold gain change (Mightaswell do velkoz,taliyah,new champ are all more efficient then brand)
Lee sin is subpar ever since green jng item and Riot pointless buffs cant compensate that void
Jhin is literaly the worst ADC in game only rivaling vayne. High elo players can orbwalk at high attackspeed jhin is there just for noobs and even then he sucks
Le blanc is garbage tier ever since the revert + Riot even gutted her further. The only impressive thing about her is undeserved banrate
Ezreal is fine
Zed is barely viable (Barely as in almost to weak)
Lucian is slightly overated but whatever, only useful when ahead
Whenever you play lucian ADC you might aswell player irelia/yasuo adc be more mobile and overloaded with slightly less range
Jax is debatable even with reaver. I wouldnt touch him
I ll list what I would personaly nerf (Only nerfing eventho I would like to suggest buffs to)
I am not biased type of person and I main way to many champions and care more about the game overall health rather then not nerfing my OP mains.
Flex roles > **Yasuo **and ** Irelia **(I literaly main both and I am asking for nerfs, they arent OP per say but they are both tier 2 in 3 different roles)
I would personaly remove the windwall curve (MAKE IT MORE LIKE AN I RATHER THEN C), and make Irelia W dodge-able (slower missle)
Jungle > Evelynn (Shouldnt exist in current state and I mean it) , Cammile (shouldnt exist in current state, toplane cammile also needs nerfs) , Graves (to OP nerf W vision reduction in some way), Kindred (To OP nerf dmg),
This 4 Need big nerfs (Kindred medium one)
Below 5 need small nerfs
Mini love tap nerfs to Kha, Rengar and Gragas, Hecarim (Didnt need that buff), Nocturne (Paranoia lasts entire S8 teamfight duration 10/10 NERF)
Toplane > Nerf Cho (prob silence), Sion (Best tanks atm along with Ali support and gragas jngle by a margin but granted tanking in this game sucks)
Revert dumb Fiora buffs, Revert dumb Riven buffs (Last few), Nerf Urgot (IDK what excatly), nerf AATROX (auto dmg by a bit)
Midlane
Nerf Lissandra (She can also be flexed top) it has nothing to do with new passive she is just more efficient assassin then most assassin, almost as efficient dps mage as cass/tali is while being CC lockdown zone machine which is also quite impossible to gank
Nerf kassadin (The only reason this champ is usually broken is because half of Riot balance staff mains him and needs him to maintain high elo)
I would say Nerf Ryze but lets respect low Elo...
Marskman
KYSAISA by alot
Draven (by a bit he liked those new runes)
Lucian (by a bit, strictly for winrate.. I dont think the winrate he has is realistic.. but whatever)
Support
Pyke
Thresh (strictly since his winrate is to high.. I dont think his winrate is realistic either)
Rakan (not to much tho)
General toxic flash combos nerfs
Vladimir E>Flash, Neeko R>flash, Galio W>flash this combos shouldnt exist in a game (I hate removing mechanics but.. ughh there is a good reason for this)
Nerf kennen and jayce because they benefited to much as ranged anti melee champions with Uber Tower damage buff, free tower gold, map opening up later turtling the ranged overlords)
Thats enough for 1 patch
After those I estimate YI and Kled being the next biggest problematic thing