Why is Kennen tagged as 'Marksman'?
His entire kit scales with AP, with the exception of his W which requires you to attack 5 times to get the benefit of 80% AD bonus magic damage. While that's a pretty hefty amount, it's also the only ability he has that scales with AD. Building AD on Kennen means he's sacrificing damage he could have on Q, W's active, E and R, all for the bonus damage from W's 5th attack.
I'm not convinced that's entirely worth it, so I'm confused why Kennen is listed as a Marksman. He just gives up so much if he wants to go the AD route. Maybe I'm not building Marksman Kennen the 'right' way.
Can anyone explain why he has that tag? What build does ADC/Marksman Kennen have?