Here is an Idea. In the JoJ there is a map link on every page which a map of Valoran. When the new TT map was released with Elise, there was a web page with lore about the Shadow Isles and a list of all champions from there. Why not make an interactive map that when clicked on city states (Demacia, Noxus, Ionia, etc) if would give a bit of general lore and a list of all champions related to those regions. Any champion from another world or without a home would be listed with the institute of way.
Demacia: Garen, J4, Lux, Shyvana, Galio, Poppy, Fiora, Sona, Vayne, Xin Zhao.
Bildgewater: Fizz, Gangplank, Graves, Miss Fortune, Nami, Nautilus.
I think this would be an easy and efficient way to see which champions belong to which group.
Just an idea to be thrown out there.