So hia all thais is my first guide on making a champ but i came up with this build, tested it, and it was AWSOME (the enemy surrenderd after me having a doudle quadra kill with my score 10-1-8) soo i decided to share my build with u guys:D

btw i made my self a stupid name so call me Zaggs ok?, ok, good...

Get boots and pots then recall at about 1500 gold and get bersekers greaves and 2 doran blades then if ur fed get phantom and bloodthirster(b.t) but if ur not get zeal first then b.t sell the dorans and try to get phantom after the core items if ur still not fed (highly unlikely) get some dmg from smaler items like bligewater etc.gurdin angle is a must have cos if u make mstake in teamfight as a AD carry u die = the fight is lost and ofc some nice armor and mrs then at about 35-40 min get Infiny edge to baisicaly own the other AD carries combined with ur armor pen also maladreds bloodrazors is good choice for some nice anti-tank action for flat hp tanks like Mundo. I haven't realy tried hybrid items ilke: guishino's gunblade or malady but i'm telling u please don't try it cos i's baisicaly no dmg from skills or from basics so just dont tryh this at home:D

SO ok, so ur starting the game u get shoes and pots and run up into the brush (take "W" first cos with kennen's basic stats the passive from his "W" deals more dmg then his "Q" and "Q" is also a skillshot) Lets say ur laning with Ahri or LeBlank just build up the passive from ur "W" and every now and them as fast as u can land it on them, it wont take energy or accuracy and it will deal some nice dmg o lv 1 or 2. In the meanwhile farm and avoid any nasty bursts and/or skillshots intended for you to drink up all ur pots, get up to lv 3 and then u hav all ur skills and u can poke/harras as hell. The combo is easy:charge up ur "W" on minons run up with "E" and hid with "Q" then "E"(active) and maybe a few auto-attacks and the enemy is less hen half hp

MISSION COMPLETE

ok, now ur at lv 6 and lets say ur stats are 0-0-1 its about to change right NOW!! ok let the enemy push a bit (somwhere close to the turret) hide in the brush with ur S.S (summoner spells) ready and then pounce like a nija on a chiken!!! if there in range for ur "Q" land it when ur hiding, then jump with "E" then ulti and "W" whan the enemy is stunned ged ignite and land about 3 or 4 shurikens from "W"'s passive and a few auto attack then if there still alive use "E" then land "Q" and there stunned again(if not dead) using this combo will actualy NOT use all ur energy!!! (also for energy concerns u can get a blu buff which will give u a sweet +30 energy regen!)

i always take Ignite and Flash ,but there are some other viable spells:

CAN TAKE:
Exhaust: thogh kinda weak with ur built in stun
Teleport: if u realy dont wanna lose ur turret
Ghost: i dunno why anyone would take that because u hve ur "E" whitch also ignores unit collision
Heal: preety sweet can save ur life, but i dont find it manditory
Cleanse: it's good but i usuly don't need it cos o my "E"
Smite: u can tke it IF UR JUNGLING (whitch ain't o bad with kennen)

thats that and now the:
DO NOT TAKE
Clarivoiance: thts for a suport NOT a AD carry
Clarity: hmmmm.......idk, oh, yes probably cos: KENNEN HAS NO MANA!!!
Revive: i don't think i need to tell u tht one
Promote: one word - USELESS
Surge: AD, meh AP, meh but the movment speed is okay if u hate ghost for some reason and ur not playing kennen or rammus cos of there MS boost

High dmg all the time / U will be blamed if u lose
One of the best auto-atack range / Not minon killing combo with "E"
all his skills are useable the whole game and "W"
Has awsome skins
Great harras/poke

AD Kennen is very good and often underestimated. get as many shots with "E"'s passive, use ult in team fights for a stun to win the fight, very high mobility and of course:

IS A FLIPPIN' NIJA!!!!!!