I almost wish Kayn could stay Kayn.

I didn't know where to put this, but I'm leaving it in Gameplay because I'll be discussing gameplay ideas, but I wish that at 20 minutes or so, if you hadn't picked a form, you'd get some sort of slight buff, and a 5 minute timer where both sides of Kayn and Rhaast become active. If by 25 minutes you didn't pick a form, you'd be base Kayn the rest of the game, but with some kind of synergistic buff to do a bit more damage and heal a bit of the damage you do.

Kayn and Rhaast are among my favorite champions, but the main appeal for me is seeing them be forced to interact when they clearly don't want to, and having an almost campy camaraderie despite one being a harbinger of the end of times and the other being an assassin hardened by war. With new voice lines, real time buffs to make him playable after 20, and both of them still being there. I know this is really wishful thinking but I think it plays to the strength of the characters as characters, if not so much as champions. A Pact Mode of sorts for them where they both use their powers to work together for the time being instead of consuming each other.