FE Builder GBA Avatar

I’m thinking of making a fire emblem fates romhack. I want to make an avatar that at least chooses if you’re a boy or a girl and it having various effects on the game. Is that possible?

Yes, just create a branching option at the beginning of the game. Have each option set a flag and have each flag lead to recruiting a different character ID.

How about if it changes the story by like a few words?

If you want the branching path to change things later down the line, just use global flags. These will stay on for the entire game.

what if I want the character to say milord or milady based off of a flag, can I do that?

I think so. If I’m not mistaken, there is an “avatar name” that you can reference during text, it may be as simple as changing the name with a flag at the beginning of the game, but I have never tried this myself, so I’m not 100% certain.