Idea: Increase Kennen's W damage.
Seeing as Kennen's W is absolutely essential for both his zoning playstyle and his waveclear, it seems to me that it should be doing a lot more damage. Two items in (if you're building the standard Zhonya's Rylais), an E W combo doesn't even clear the casters. Additionally, in lane, Kennen's presence with W is very small. The goal, I think, would be to Q and then make the enemy fear the W. This would zone them out, rewarding you for landing a Q and punishing them for getting hit by it. But the way it is now, W doesn't even leave a scratch. I feel increasing the base damage or the scaling would fix this. Let me know what you think.