I would have guessed data Riku personally.

Of course DDD also had a data version of Ansem the Wise in Sora’s heart. In fact, Ansem’s research data was put in Sora’s heart. Also, Ansem was digitizing Kingdom Hearts into data in the second game with that machine. Clearly, there are many things laying the path for the datascape and data Sora being a part of the true final battle.