Skin advantage
I read a post about how the super Galaxy rumble skin gave rumble an actual advantage and riot took that away but since riot wants to add to the strategic battle of LOL, would'nt it make sense for each skin to provide a little perk to the champion using it? So like Firefox Ahri would deal a small amount of burn damage and all the water skins would have reduced damage on fire abilities. It doesn't have to be a big advantage but something a little more than the sunglasses provides then that 1 point of protection from Leona.