If I were to guess units for a new banner based on the games people picked then:
FE10: Jill, Tormod, Volke and Heather GHB: Sephiran
FE Awakening: Kellam, Ricken, Gregor and Say'ri GHB: Validar
my one Three Houses: Dorothea, Sylvain, Felix, Marianne GHB: Solon or Nemesis, but I want Metodey