Question in title. I will also not give her Steady Breath as I am f2p and wouldn’t sacrifice a BIke for that.
I’d run a +Atk/-Spd, since you can easily make her Def much higher with her breath buff, A slot and seal, and her native defense is already high enough to not have to worry about tanking too many hits without the +3 from the bane. +Atk also helps counteract Lightning Breaths low might.
Fury is good, but that restricts the use of QR if your using that skill. If you don’t mind that being a one trick type of skill, or using a different B skill, fury should be the way to go. If you want to utilize QR, Def+3, Fortress Def, or even Steady stance if you still have the extra BK lying around would work better with QR than fury.
Pokemon GO
Fire Emblem Heroes
Fate Grand Order
Dragonball Legends
Dragalia Lost
IV Calc
Heroes