Ple-Sen
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Yeah, Eisen: medical skills + survivability (if you increase friendship)
Matthias: full rogue build + bonus to leveling + extra action
Victor: possibly has the philosopher skill (it was overpowered in the previous game), a number of situational non-combat skills (which none of us have), the teacher skill (also situational and doesn't directly enhance your character), the firearms skill (not sure how useful it is for a shinobi), and a bonus to his best stat for the first level of friendship.