Things I would add:
Make the holy weapons more plot relevant
A Berkut like character maybe a female noblewoman who's the cousin of Sigurd.
Supports and Barracks
More Classes
Weapon types to existing classes
A animal shifter of some kind
Things I want to see:
Make Lewyn x Erinys one of the canon pairings Fe5 did it so can this remake
Azelle x Tailtiu maybe canon
I wasn't able to pair up Lachesis with anybody and I don't get Nanna so now Leif will be lonely. Will this negatively effect the story?
Out of curiosity, If one ends up not pairing anybody, will the story experience be drastically worse?