What's the most played champion in the history of professional league?

Tristana, Corki, or Ezreal... well-rounded ADCs that have been around forever...... <.< Also Janna is really old and always useful.

Teemo probably.

has to be

Lee Sin.. I cant remember a time when he wasn't relevant

Lee Sin or Janna probably as both have been major players in every pro season as far as I can remember. LB, Ali, Gragas, and Morg are all possible candidates as well I would think.

Lee Sin?

Probably one of the earlier "flashy" champs.