Yeah i just checked his pics again, getting Iris and Bernice to cc60 is a good idea, and maybe dorca to cc50 since shes 50 right now. Dunno if he has spica though (or enough DC for her). Maybe Imellia for duelist (i dunno, i never really used bandits), but Claudia is surely a good option.

Sophie tends to die on early levels, cause she blocks many enemies with low defense. But at high levels, only thing that can even scratch her are 3+ liches D: , not to mention her 1200+ attack, 1 shots most of goblins/wolves, 2-4 shots heavies like they had no defense at all, eats liches in 10 hits or less, and absorbs 30% magic dmg.
On 500enemy map, those 4 black goblins cant even damage her, if she is awakened. Her def is so good that passive regen just compensates damage. It's kinda silly to see them trying to kill her xD.
All in all, awesome unit, but needs lot of investment