u should max out thundering shiruken first i think then lighting rush last

First game: 19-2-9 :D +1

Thanks for the suggestions Trojan995. I tend to think of mejai's as a pretty critical item because it improves your AP while you're saving up for some heavy-duty expensive items, so it helps that you can buff yourself up without any items. It is true that it would take some familiarity with the character to stay alive and maintain stacks, so for a beginner, I would skip the mejais, and perhaps get banshee's for survivability. When to get it depends on how you're doing in the game. If you're doing well, I'd get it later, if you have problems surviving, then go earlier.

+1, I like it. I play a lot of kennen, and many of these items work fantastically on him. I do have a few suggestions, however.

-Meijai's: It's a sensitive topic. I say that mostly because I hate it. I usually tend to cringe when it's in a core item build, but some pain is alleviated when an alternative is presented. Since no alternative is presented, I'd ask that you either put a more solid core item in the build, or if you're adamant on meijai's just suggest an alternative in your build.

-This is more a compliment than a suggestion, but I really like your summoner spells. I'm a fan of Ghost on kennen, but I'm really rethinking flash on him now.

-A justification of your items is always nice.

-And lastly, because I'd like you to be aware that I do think this is a nice guide, I think it's cool that you grabbed a whole bunch of magic pen. And your rune justifications really answered my questions about the AP quints.

Nice build.