3 houses and a destination
CONDITIONS
ABOUT FATE CHARACTERS (Sieg and Jeanne)
They are both a couple throughout the story (whether they like it or not). That can't change.
They can make mention or references by other characters in Fate, except involving them directly in the story, but if it is going to be one, let it be one involved with the church or religion, THAT IS WHY I DID NOT WANT EMIYA OR SHIROU, I don't see the point in them in three houses, I think in another FE they could be good, but not in this one.
As for whether they want to make lemons or something more spicy, it's a personal preference or if they ask for it enough in the comments.
As for its use in the story, well, I think the monastery also taught classes to students outside of the house classes, but I still want them to be involved.
Some conflict and ideologies with Rhea, as both will have feelings about what Rhea has done, about the church and about the creation of homunculi, like Byleth's mother.
AND IF EDELGARD IS RIGHT ABOUT HER.
ABOUT FIRE EMBLEM
If or if the black eagle route, since that is where Byleth is completely freed from Rhea's plans and machinations.
But if you want to save or at least keep other characters from the other houses alive, feel free to do so.
And before a Dimitri fan comes to defend her, she is literally an emotional time bomb who doesn't hesitate to give orders to kill civilians and play the betrayed victim in some cases and respond with violence and absolute extermination over what she considers wrong, as it was with Lonato.
About the Ashwolves, well the DLC wasn't installed on my friend's switch so I have no idea what the story is like with them.
And as for keeping Byleth as a man, since she always played as one in the games, but it's more a matter of personal taste.
Also, I would like to make better use of certain antagonist characters like Kronya in the story. I feel like she had potential, but they killed her off too quickly.