For me it's Shamir.
Fire Emblem games need to stop letting you reclass your units into anything. I don't care how funny it is to make your twig mage into a barbarian, it's dumb. A big consequence of that besides taking away unit identity by making the most optimal route just reclassing everyone to the same class is that nobody gets unique models. Everyone is just a copy paste head model onto a palette swapped generic model. Give a character only two/three reclass options at most and give them unique models for all of them. They can also update the portraits as to match.
Also every game should do what Engage did and have out of combat outfits for everyone, especially if you're gonna be having a hub world between chapters. Having two characters eat dinner together in clunky ass knight armor is retarded.
Remake 3H and unleash the full goth potential of my waifu Shamir