Unwanted champions
Ask any Summoner and they'll tell you nothing is worse then putting in all the work and saving up crystals to only get a unwanted Champion. It's makes you want to quit the game. Especially when it's a 6-star champion and you've been saving for three or four months.
We need some kind of exchange system for five and six star champions. It would also be nice to get a respin every now and again so if you get a champion you hate you can respin it.
It will be nice not to be stuck with The Unwanted champions.