I think I'll do mine by game, I haven't played Shadow Dragon or Fates so here they are:
Binding Blade: Cutest: Lilina, Prettiest: Cecilia
Blazing Sword: Cutest: Nino, Prettiest: Ninian
Sacred Stones: Cutest: Neimi, Prettiest: Between Eirika and Tana
Path of Radiance: Cutest: Mist or Jill, Prettiest: Elincia or Lucia
Radiant Dawn: Cutest: Mist, Prettiest: Micaiah
Awakening: Cutest: Nowi or Cynthia, Prettiest: Lucina or Severa or Cordelia