One of the only two "Unknowns" shown in the American version. This Unknown come onto the scene fighting a ton of Heartless unsing two Keyblades, the Oathkeeper and the Oblivion. This Unknown has the most screen time in both "Anotherside, Another story" and Deep Dive. Many clues have been collected to show that this person is Sora. Although, all of this is circumstantial and vague.
First clue: This character uses the Oblivion and the Oathkeeper Keyblades. The Oathkeeper's keychain is a Paopu fruit, this chain was given to Sora by Kairi. And in the movie, he passes one of the Keyblades to the Blindfolded Unknown. He throws the Oblivion and keeps the Oathkeeper, which keep in mind was a gift from Kairi to Sora.
Second clue: During the movie the Duel Wielder proforms the move Strike Raid in which he throws the Keyblade like a boomerang to attack. Sora learns this move in the game which points to the fact that the Duel Wielder might be Sora. Although, I suppose anybody who has the power to use a Keyblade would be talented enough to use that move.
