I've heard Energy runes are terrible, so I wouldn't go with those. Reds is obviously Magic Pen. For blues I would suggest AP/level and for quints AP.
Yellows is a little harder to choose, if you are laning top armour would definitely be good. For mid, HP/level might also work.
Oh, and I don't play Kennen, but I know a fair amount about runes.
TL;DR: Ask Searz.
Yellows is a little harder to choose, if you are laning top armour would definitely be good. For mid, HP/level might also work.
Oh, and I don't play Kennen, but I know a fair amount about runes.
TL;DR: Ask Searz.
I take Magic Pen Marks, Health/Level Seals, AP/level Glyphs and Flat AP Quints.

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Reds - I have chosen Magic Penetration. This is the one constant choice across the spectrum that I have come across.
Yellows - Health regeneration or energy regeneration per level or per 5sec? Or should they be Flat? Others have said Flat Armor. What do you say and why?
Blues - There are those that emphasize Ability Power. There are those that emphasize Magic Resistance. And still others CDR. What do you say and why?
Quints - AP, Health, etc. The suggests here can be just as wide ranged as the Yellows and Blues.
* Again, I realize it often comes down to personal preference but I'd like to hear from experienced Kennen players. Thanks.