Champion Practice
When a new champion comes out, the first thing anyone thinks is "Is this champion good?". And I personally think Ekko is cool and would like to try him out. Only problem is I either need to buy him or I need to wait for him to be in a rotation which God knows how long that will be. The Champion Practice will allow you to choose a champion, and one to go up against (optional). If you choose the champion your picking, then the bot will study your play style and item choices and use them against you, that way if I went against a Teemo that had a similar play style/item choice, I would be able to outplay him. There should also be a CS camp where you can practice last hitting minions. When one dies another one spawns and you are invincible while in the camp (so you don't keep repeatedly dying). You start off with 100k gold, allowing you to buy any items you want. You can also level yourself up in a beacon. You can also invite people to the Champion Practice as well.
Not only will this help players be better in League of Legends, but Riot can also make more money this way as well. Tell me what you think in the comments, and if a Riot Staff Member could bring their input that would be highly appreciated as well.