What do you think about developing a Tier List among all, since I do not know that anyone has compiled data since the 6★s appeared?
I think the game today is very different if we talk about defense and attack teams, so we could make one list for each role.
In defense, top characters are pretty obvious (basically Multiple Erikas and Magna are the B&B of any good defense), but we could talk about less used but situational characters. For attack there are a lot of options and I can see the new Andrea giving ranged teams a clear advantage too, especially for F2P players.
PS: We have a first list!