>>4422992
If I had to pick one for each class and if we disregarding what I said here >>4422863 about just having two extra class I would pick:

Grand Saber: Nero Bride
Grand Archer: Zenobia
Grand Lancer: Summer Tamamo or Summer Melt
Grand Rider: Ushiwaka
Grand Assassin: ?
Grand Caster: Queen of Sheba
Grand Berserker: Kreimhild

Grand Ruler: Kenshin (If I will get her)
Grand Avenger: Spishtar
Grand Alter Ego: Meltlilith
Grand Moon Cancer: Hakunon
Grand Foreigner: Hokusai
Grand Pretender: Tlaloc