What I put:
Birthright S: Corrin, Felicia/Jakob (whichever you get first), Kaze, Azura, Saizo, Hinoka, Takumi, Reina, Ryoma, Scarlet
Birthright A: Subaki, Silas, Oboro, Hinata, Kagero
Birthright B: Orochi, Setsuna, Kaden, Izana, Yukimura, Shura
Birthright C: Rinkah, Sakura (B if playing Female Corrin), Hana, Azama,
Birthright D: Hayato, Mozu
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Nohr S: Corrin, Felicia/Jakob, Camilla, Leo, Xander, Azura
Nohr A: Silas, Elise, Effie, Niles, Peri, Keaton, Kaze
Nohr B: Gunther, Arthur, Odin, Beruka, Selena, Laslow, Shura, Flora, Izana
Nohr C: Nyx, Benny, Charlotte
Nohr D: Mozu