Best bans for each division
Optimal Bans
Diamond+ God Tier [Likely/Should Bans]: Kindred, Nidalee, Soraka, Ekko, Taric, Zed Good Bans [Popular Strong Champions]: Ahri, Janna, Maokai, Fizz, Azir, Gragas, Ryze, Yasuo Meh Bans [Probable But Unnecessary Bans]: Graves, Malphite, Master Yi, Alistar
Platinum God Tier [Likely/Should Bans]: Kindred, Soraka, Taric, Nidalee, Ekko, Zed Good Bans [Popular Strong Champions]: Ahri, Janna, Blitzcrank, Fizz, Maokai, Jhin, Irelia Meh Bans [Probable But Unnecessary Bans]: Master Yi, Darius, Leblanc, Malphite, Graves, Poppy
Gold God Tier [Likely/Should Bans]: Ekko, Taric, Kindred, Soraka Good Bans [Popular Strong Champions]: Maokai, Janna, Sivir, Fizz, Nidalee Meh Bans [Probable But Unnecessary Bans]: Zed, Master Yi, Malphite, Darius, Graves, Alistar, Leblanc, Yasuo
Silver God Tier [Likely/Should Bans]: Ekko, Malphite, Taric, Kindred, Soraka Good Bans [Popular Strong Champions]: Fizz, Blitzcrank, Ahri Meh Bans [Probable But Unnecessary Bans]: Zed, Master Yi, Darius, Yasuo, Leblanc, Alistar, Graves, Jax
Bronze God Tier [Likely/Should Bans]: Ekko, Taric, Malphite, Yasuo Good Bans [Popular Strong Champions]: Xin Zhao, Ahri, Blitzcrank, Fizz, Soraka Meh Bans [Probable But Unnecessary Bans]: Zed, Master Yi, Darius, Leblanc, Graves, Kindred
Explanations Ahri [Good Ban - Silver/Bronze] - Despite being an extremely skillshot reliant champion, Ahri makes for a great show in all divisions, even silver and bronze. The reason for this is more for her defensive capabilities than her ability to body champions. By utilizing her triple jump and speed boost, even an amateur level Ahri can get out of many otherwise sticky, and difficult situations. Additionally, since her W and her ultimate both deal AOE auto-targeted damage, she can pick up multiple assists and prevent tower diving executions without meaning to. Azir [Good Ban - Diamond] - Despite rocking a sub-50% win rate at all divisions including Diamond, Azir is still a decent ban at this division if nobody on your team wants to play him. The reason for this is that he's an extremely popular pick, and quite good in the hands of an experienced player. If anything, he's good to ban if just to potentially throw an enemy one-trick-pony off balance. Blitzcrank [Good Ban - Bronze] - Surprisingly, Blitzcrank isn't banned all that often in Bronze compared to other champions. However, I would argue that he should be a borderline must-ban. His play rate is by far the highest out of all the supports with positive win rates (other than the new Taric), and by banning him you're much more likely to get a Thresh on the enemy team. Ekko [God Tier - All Divisions] - As a must-ban in all divisions, never ban Ekko first on your team. generally, leave him open unless it's the very last ban (meaning the enemy team has first pick). Gragas [Good Ban - Diamond] - At a perfect 50% win rate, Gragas may not seem like much of a ban potential type of champion. However, if you're trying to keep a God Tier champion open to pick up for your team, it's not a bad filler spot as one of the more popular junglers on the rift at the moment with decent amounts of utility. Kindred [Meh Ban - Bronze] - Despite being nearly a must-ban in all other divisions, Kindred tends to fall off in Bronze divisions (despite still being quite strong). Since she's generally banned otherwise, it might be worth leaving her open just to see if someone is forced to play her against their wishes on the enemy team. Nidalee [Good Ban - Gold] - The difference between high division Nidalee players and average Nidalee players is quite stark. Where Nidalee is a priority ban at Diamond+, Gold players can pick their poison when it comes to Nidalee, as her popularity isn't all that high anyway. If the enemy mains one of the "Meh Ban" champions, it might still be worth a guess over Nidalee. Soraka [Good Ban - Bronze] - Soraka surprisingly almost never gets banned in Bronze, probably because she doesn't have high kill potential and all online advice says not to play passive supports in Bronze. Meanwhile, she still has a respectable 52% win rate and decent play rate, so it may still be worth a ban depending on your lane match-up. Xin Zhao [Good Ban - Bronze] - Xin Zhao is surprisingly one of the most popular junglers in Bronze for some reason. and is definitely extremely powerful right now (at all divisions). Maybe it's just a lucky guess, but if they're picking him, you should probably ban him. Yasuo [Good Ban - Diamond] - Similar to Azir, his success rate isn't all that high, but if you have a hunch that someone on the enemy team might be a Yasuo main, feel free to ban him. Zed [Meh Ban - Gold] - Like Nidalee, this high skill requirement champion does great at higher divisions but not so good at average divisions. Again, it might be worth skipping over this champion as a ban and guess at who the enemy team mains might be.
*i did not make this list just brought it from nerfplz so people can see it, dont rage at me just upvote so more people can see and have a good day inless ur carl AND I SWARE TO GOD CARL YOU KNOW WHO YOU ARE DONT COME BACK