Very minor thought re: Kai'Sa design
I realize it's a bit late now, but something is bugging me with the loading screen graphics that you might want to consider in the future, design-wise...
If you have a female character who has a bodysuit and retractable mask, maybe don't have the mask retract over her cleavage, too? She's un-shielding her most vital organs for literally no reason but fan service, and unless she has some manner of boob sonar that requires her chest to be exposed, that animation is just gratuitous. Hell, it wouldn't even be so bad if you'd just made the mask end at the jawline--yeah, you would still have the impractical armor configuration, but at least you wouldn't be calling attention to it with the animation.
TL/DR: Artistic license is fine, but maybe don't make your armor phase away into a cleavage-hole in your intro screen.