ARAM needs bans
So here is my thinking, based on the size of your roster(how many champions you have unlocked but I was hoping in the 5-10 range) you get a proportional amount of bans for ARAM, so basically you select a character that you don't want to show up for you in ARAM, basically these are personal bans so each player chooses their own bans. You could still trade for this champ you banned if someone else rolls them or tossed in to the discard pool with the same stipulations as normal, just I find I find I tend to get the same characters over and over again, would be nice to be able to ban out certain characters that are bad in ARAM or that you don't feel like playing.