now, I know Kayn is relatively new to the game, but as i was surfing i saw A skin concept made by Valkhar that Depicts Project: Kayn.
You see, Project Kayn fits the whole Archetype of dark and Gloomy in a Cyberpunk Dystopia, the narrative could be something like how he is the very First to Rebel against the Machine ; how he is Locked in an eternal Fight with the Directive known as RHAAST and his Forms Shift Based on whether the Directive wipes out his personality or he emerges Victorious and in Control of his cybernetic body
Just something i wanted to share, could be a Very nice Legendary skin.
I really hope a RED sees this, maybe we can get someone to pitch it to the Skin development team
EDIT : as Pumping Iron showed : here are the 2 other forms made by the same artist (once again, it's not me, check his Deviant art account by click the link)