A snapshot from each season to compare champs that had highest WR, ban rate and popularity and also the general state of the game [Average Duration, Blue vs Red WR, etc.]. :
This RANK 1 KR Akali Build has NEW OP COMBOS?!? SEASON 11 BROKE AKALI - League of Legends - YouTube
LoL : Guide, Runes et Objets Akali Top S11 - Gamosaurus