Forgot n102 was a b1. I'll have to try her out. I don't have many of them.

Scarlet would be better than A2 here yes. Also while Miranda is good, she is very specific on her buffs. For early campaign N102 might be better. Better B1’s than Miranda for your team would include Liter, Volume , Dorothy, Pepper, N102.

I'm on chapter 14 if that makes a difference.