User blog comment:Soltyray/Would like a little help with units. Plz/@comment-27360323-20160101111938

You got some goods there... So first thing first, you need 7* to..

Mitigator : Krantz, Reeze

Good Leader and Skills : Avant, Zenia, Ultor

BB maintaining : Medina, Libera, Sixgear(good on both damage and BB fill rate buff)

After you get each of the 3 to 7*, you good to go, just need to focus on leveling up (get more cost). Then feel free to levelup any units to your liking.