You can stun your opponents by inflicting 3 Marks of the Storm upon them.
Lightning Rush can be used to initiate fights with its Energy return component, allowing him to use other abilities afterward.
You can land an initial Mark of the Storm debuff on an opponent with Thundering Shuriken, and then add to it with Electrical Surge.
Consider playing a bit more cautiously around Kennen when you have a Mark of the Storm debuff. If he hits you with 3 Marks of the Storm, you will get stunned.
Kennen is flimsy by nature - turn and attack him if he gets careless with Lightning Rush.