Abilities
Kennen's abilities apply a Mark of the Storm; at 3 marks, the target is stunned.
Kennen throws a fast shuriken that damages and marks the first enemy hit.
Passively marks enemies every few attacks; activate to damage and add another mark to already-marked targets.
Kennen becomes lightning, passing through units and marking them, gaining speed on entry and attack speed on exit.
Kennen summons a storm that strikes nearby enemies, stunning those hit multiple times.
Guide
Kennen excels as a poke mage and teamfight initiator in ARAM, using his mobility and AoE stun to control fights. Focus on landing Qs for poke, then engage with E and R when the enemy is grouped.
Tips
Use your E to dodge skill shots and reposition quickly in ARAM's narrow lane.
Build Zhonya's Hourglass early to survive after using your ultimate in teamfights.
Max Q first for poke damage, as ARAM favors constant harassment.
Save your flash for a combo with your ultimate to catch multiple enemies.
Buy Sorcerer's Shoes early to boost your magic penetration against squishy targets.
Combos
Flash + E + R to engage and stun multiple enemies.
Q + W to proc your passive stun and poke from range.
E + R + Zhonya's to dive in, stun, and survive the counter-attack.