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Ah, yes, I meant is it possible to get any hints on what personality it wants? I've spent over an hour just redoing the personality test portion to see if I can get anyone but Sergio and Allegra.  Is there just one specific combination that I have to get to see these characters? Even choosing VASTLY different personalities (like choosing the exact opposite answers) I always end up with Sergio and Allegra,

Sergio's route isn't affected by the questionnaire, so you'll get him every time if you keep choosing the same prologue choices. Only Vincent, Eira, Festus, and Allegra are affected by the questionnaire. Try writing your choices down the next time you do it, because if you flip to the opposite answers, you'll get a different character.