User blog comment:Francisod13/Well well/@comment-27850788-20161115003628

Charlotte only has mitigation on SBB so she's like a half mitigator which means she won't be as reliable as other traditional mitigators. I think if you still don't have a decent mitigator than yes you should probably pick one for the unit of choice as Charlotte is just ok in my opinion. And unless you grind out the collab dungeon you won't be able to get her special sphere either. Stein is also a very good mitigator so keep him in mind too when picking. Do some more research on what omni units that are being offered are mitigators as it will help you decide on which one is right for you. Or whichever one you think looks the coolest :)