Kennen is more a hit and lure character. Very quick and fun to play

Its best to get up your Electrical Surge and Lightning Rush first in my opinion. if you hit them with Lightning Rush then turn and run and get them with Thundering Shuriken then hit them with the Electrical Surge for more damage and a stun then move close while they are stunned and use Slicing Maelstrom and keep them in the AOE for about 2 seconds and there's another stun so you can keep dishing out the damage

Kennen's attacks are all based off AP so its best to just stack all AP and then also get Magic Penetration for more tanky people

Yet again wanting to stack AP so that everything is just doing more damage especially when you have Slicing Maelstrom it does three strikes and stuns them in about 2 seconds then keep attacking for more

I like these items but you could switch the order around. You can normally last fine till later on without any armor and the bloodthirster is very help you can either stack more AP or go for quicker attacks first either way is still effective

Ignite isnt my normal spell but is help if they are running and need to finish them off with the last of their health and Revive is always on for me i use it as a last resort of defense if they attacking our base or turrets

Kennen can move quick dish out heavy damage and is good for soloing against anyone