OKay, so I just rescued Ashe && now i like 5 characters. I can get all the way to the Judge Ghis? i think is the boss, but my characters are only level 12 && both times i have tried i die when his bar is sooo low.

besides leveling is there are tips?
also who should i keep as my main "3" so i can level them a bit before i continue? i personally like Ashe...but she doesn't seem that special in battle, i just like her character.