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Here is a thread about Storm Dragon Lee Sin's main features and VFXs! 
As usual let's start with the most important one: his dance.
(It is highly spammable.
)
As usual let's start with the most important one: his dance.
(It is highly spammable.
)
The first feature for this skin is his Epic Monster execute. Whenever he kills an epic monster, a lightning will strike it down a second after the kill (delayed so that it is not confused for a smite).
Another feature is when he's in the River: he is so powerful that lightning crackles at his feet!
And if Storm Dragon Lee Sin kills you, your screen will become engulfed in a (subtle) lightning storm!
Now onto his kit! He summons Ao Shin in his Q! Ao Shin follows him if he recasts and spins around him on arrival. Ao Shin's presence is so powerful it scorches the ground with lightning.
His W is a shield filled with a powerful storm.
His E is a powerful lightning strike violently scorching the ground. The recast summons a lightning strike on all enemies previously hit, slowing them.
His R creates a powerful lightning chain between him and his primary target. If other targets are hit, a lightning chain is created between them.
His Taunt is highly spammable! He does push-ups with lightning coming off his eyes, and he does it really fast if you spam it!
In his joke, he fails his move and summons a tiny rain cloud above his head. 
And when laughing, Ao Shin joins him!
And finally, for his recall, he summons Ao Shin in a powerful storm cloud!
Since some have asked, here's what his dance looks like when spammed!
