Skin background stories
We know that some skins are created in a universe different then the one of their classic one, and if it's possible to create a story based on a large range of similar concept skins, it would take the game to another rank, where it's not just known for a popular moba, but instead being described as a well created game universe with creative, unique characters.
But first fix the champion info pages when they get an update.
This would probably take a long time, but it could be done by any riot employee,and players,in any spare time, providing having a similar structure, and is being serious.