I've been waiting for shapeshifters/laguz since launch! I really want Keaton, Kaden, and Panne. Ranulf too.
I also really want Hayato, he was an absolute monster in Fates, and it's so weird we have Rhajat but not him. Inigo, Shigure, Soleil, Siegbert, Owain, Severa, and Shiro all have their parents in the game. It even says "Hayato's daughter" in the description of her!
I also want Nyx, Orochi, and Shiro. Ricken, Vaike, Aversa, Rhys, Nils, Izana.