No, Valentin is not a girl. They’re non-binary!
Love Conquers All Games
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All the progression in the game is equipment-based! So stats-wise she's just locked to whatever items are available at that point in the game. However, her battle abilities are well-rounded by design, as opposed to being specialized—she's the only character who doesn't have any unique abilities, but she's also the only character who can both build the stagger bar _and_ exploit it.