Going through the summoner profile you are able to see every champion, their stats, backstory, abilities, etc. Presumably this is going to be where you can unlock different champions at release. What i propose is that from this portal for every champion (that you have unlocked) you are able to customize them. Perhaps you have unlocked different skins for a champion, select which one you want, or check a random skin box. Remove and then replace the suggested item panel to a list of items you prefer on this champion. Have a section for player notes about that particular champion. Provide a detailed list of statistics with this champion (wins, losses, kills, deaths, assists, largest damage done, time spent playing this champion, double/tripple/multi/pentakills, average kill/deaths/assists/minion kills per game, etc)
There are so many options to fill this space out, that i hope you take advantage of.