From Kingdom Hearts Wiki: A world of information not accessible by Gummiship
One of the subjects inside the data is about the three compartmentalized "boxes" inside Sora, each one containing the heart of another person. One box holds Roxas's heart. another one holds Xion's heart, The third one which has been with Sora for a much longer time holds Ventus's heart. These three hearts have melded with Sora's and no longer have voices of their own.[?]
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