I was bored so I made charts for all the champions based on their win rate and pick rate across all ranks in the lanes they are played. : r/leagueoflegends
Full champion Pick & Ban Stats for Worlds - GameSpot
Games of Legends | In-depth statistics about League of Legends competitive scene. - Part 2
The Most Picked, Banned League of Legends Champions During NA LCS Week 2
How the meta has evolved at the League of Legends World Championship