Dunno. It hasn't so far in Luceti, which is actually sort of strange considering we had merged together before Sora was on the islands. But it's inevitable, eventually one day Sora and I will have to join together again so he can be at full strength and I can be whole.
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But...it's what I wanted at one point, just like every other Nobody. I should be grateful, Naminé and I are the only ones who were able to become whole again.