Fodder or build -Atk New Years Gunnthrá
She was my free pull on the anniversary banner.
I’m thinking Joint Hone Speed would be a sweet self buffer on Nino with her new iris tome. But NYG’s weapon seems really cool.
I don't like Joint Hone Speed on Nino if you're going with the effect refine, as it creates new requirements for Nino to be adjacent to a unit at the start of a turn, but the skill works excellently on her [sic, initially wrote 'him'] if you're going with a stat refine (preferably +Spd).
With the effect refine I'd either run Odd Atk Wave or Even Spd Wave with Nino.
As far as unit's go, NY!Gunnthra is pretty cool, and, as this is FEH, I am sad to inform you that the unit is the prf sword and the prf sword is the unit.