Kennen

Irelia

Look at who he's countered by. https://lolalytics.com/ranked/worldwide/9.16/platinum/plus/champion/Kennen/Top/ I'd roll with Mordekaiser because his ability to farm from a range means Klepto Kennen wouldn't be able to auto you as much. The results would be he gets less gold and you take less damage, thus you have an easier time outscaling him. You should quickly get to the point where locking him in R is a kill if you can land your skillshots.