Custom stats by champion
It would be great to have custom stats about your champions after a game. For instance, if I play Blitzcrank i could see "Landed grabs" or "Grab accuracy", "Enemies knocked up", etc. I think it's fun to know how you were useful specifically with this champion, and it just makes you feel great about the game. Overwatch has fun stats like this for every hero and it's pretty fun to compare with friends and between games. Even when you lose the game or it was pretty close, you can still feel great about what you did well, or see where you can improve specifically with this champion, aside from raw damage and kills data.