These are my favorite pairings for each character in order:
Lucina: Inigo and Brady.
Kjelle: I didn't really like any of her supports tbh.
Cynthia: Gerome, Morgan(M), and Inigo.
Severa: Inigo, Laurent, and Gerome.
Morgan(F): Gerome, Laurent, Brady, and Owain.
Noire: Brady and Gerome.
Nah: Morgan(M) ofc and Yarne.
I also like Gerome/Inigo, Lucina/Severa, and Cynthia/Severa lmao..