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Mori and Ame have the best shots. Granted, a decent chance of rage quitting the game, though Ame's stubborn factor.
Gura has a decent shot, but it'll boil down to if she can beat Sans within a short-ish amount of time.
Ina might...Ina might. Kinda a wild card. Probably stick with the P route.
Kiara's also a bit of a wild card. Probably won't and stick with the P route, but just to be one of the girls to beat Sans might drive her.