So I have a +def -hp Brave Lucina, and almost all her suggested builds seem to want Fury and/or Desperation. I seem to be terribly unlucky at pulling Shannas (f2p here), so Desperation isn't an option, and my last Hinata is reserved for Nino, so no fury either. (Besides, my regular Lucina is already running Fury/Desperation anyway, so I'd prefer to do something different with this one.)
I know another common thing to do is Reciprocal Aid and Renewal, but I was going to do the same thing with Masked Marth, and she seems like she'd be a better candidate for it because of the extra healing from Falchion. I guess B!Lucina does have Aether, which Marthcina doesn't have, but is that enough to make B!Lucina as good a healer? Does it make sense to run that build on both of them? (I probably wouldn't use them both at the same time, so there's that.) Or is there something different I can do with B!Lucina instead? I like the idea of giving her either a movement support skill to help her positioning, or a rally to improve her buffing, but if I did that what should her B skill be? Lancebreaker? A seal? Something else?
Reposition is great and works well with her Spur based support buffs and helping out her allies.
Fortify Res 1 or Spur Def 1 seals are both useful alternate support seals you can give her to help your team out as well.
For her B slot you can use Vantage or a breaker skill you like between Swords and Lances to help her 1 round such opponents. A slot can stay her default for now until you have Fury to burn as the added defenses and speed will help a lot.
Pokemon GO
Fire Emblem Heroes
Fate Grand Order
Dragonball Legends
Dragalia Lost
IV Calc
Heroes