[What setting should the next fe be]

• Tellius but in the future. Give me the laguz waifus and husbandos, especially the ravens. 
• Slavic setting would be cool. This artist made the Three Houses characters with slavic outifts and it looks great. A spookier tone fits the concept. Give me haunted forests, gypsies and creepy fairytales. 
• Italian renassaince with guns being rare, maybe enemy especific weapons. Gentleman Bastards  and gasslamp atmosphere.  
• Spanish Crusaders, inspired in the reconquista time period and events.  

[Dead or Evil? Let's talk Fire Emblem dads. (contains spoilers)]

I want a Fire Emblem father that is playable, even if they are added in last chapters.

Other idea is making them sick or old, but visitable if you return to your birth village. When talked to, their dialogues provide some exposition and worldbuilding, pretty much like the Pokemon parents or the villagers of Shadows of Valentia.