wait for it.... Star Guardian Kayn
I'm not sure about his base form, but this is what I got going in my head, Just imagine...
Shadow Assassin Kayn is super star guardian-y
Darkin Kayn is like void stuff (like in the game mode we got goin on rn)
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Before that happens we will (hopefully) get the long awaited SG 
I just thought about this myself and logged on to see others also had the idea!
His base form would be a schoolboy just like Ahri in the video before she transformed.
His Shadow Assassin form would be star guardian and his Darkin form would be Voidlike
It would be amazing. Let's make it happen!
Star Guardian 
The only money I would spend on skins is for SG Urgot. Until then, I'm content getting nothing but champ shards from my loot boxes!