hi! I'm kento 12 and I like Kennen, is an hibrid carry, and he also can start some teamfights. Enjoy.

PROS

good harass
hard stun
can start fights if u have Zhonya's Hourglass

CONS

so weak
kennen is probably better on mid or top
his Lightning Rush is not well like Arcane Shift of Ezreal

There are my personal masteries for kennen.

Is a must u don't have another way to escape.

This is my prefer summoner spell on AD carries.

this spell has been nerfed and I think that is so UP now.

aggresive spell, but you are so weak and if they have heal or cleanse, they will bait you

pick it only if your support don't have it

harass in low lvls.

for do a pretty dmg and tons of dmg every 4 attacks

STARTING ITEMS

I prefer start with Boots and 3 Health Potions but u can buy Doran's Blade if your support is Soraka, Sona or other if he/she have a heal and you know his playing style.

when u recall 1st time you must have more than 1100 gold for buy 2 Doran's Blades, 3 Health Potions and 1 or 2 sight wards

2nd recall must be with 1800 or more gold. Buy B.F. sword and some Health Potions

before lvls 9 or 10 u must buy Infinity Edge
(buy vampiric sceepter and Berserker's Greaves before B.F. Sword if your lane is so hard.

---

MID GAME

buy Zeal and the bloodthister as soon as posible for do a great damage
after buy Bloodthirster rush Phantom Dancer

---

END GAME

buy Zhonya's Hourglass. And this is the first question. Why I must buy Zhonya's Hourglass?
I think, that zhonya's is a core item in kennen. It helps to start a teamfight if your team don't have a greater initiator.

and Last Whisper for easy kills on bruisers.

---

OTHER DEFENSIVE ITEMS

good item in AD carries. u can get 100 armor and magic resist. and u can revive after die.

I think this is another cleanse, but if the other team don't have more than 2 hard CC and 1 or 2 Exhausts this is so useless

another good item, is like Spell Shield of Sivir. every 45 seconds your champions gets a spell shield that it blocks one negative spell on you. Very useful if u are unskilled using items with active effects.

Thanks to jhoijhoi for her guide of BBCode in mobafire builds.
and for another mobafire begginers this is her guide:
http://www.mobafire.com/league-of-legends/build/making-a-guide-101506#chapter3

And pls men comment if u think that I need add anything. Thanks for watching this.