I'll start off by being blunt. I think it's Ven. A Xehanort-Possessed Ven. Possibly from another timeline, but I won't get into that. How did I come up with this? It started simply with watching a video of Ventus fighting the Mysterious Figure after watching the newest trailer for Dream Drop Distance. At the very least, I do see some connections between Ventus and Mr. Figure over here.
My first points will be on the battle with him.
- Mysterious Figure, or "MF", has a low to the ground stance, much like Ventus. Both of them wield their weapons backhanded, a trait that only the two of them, out of all of the original characters, have.
- Some of MF's moves include Meteor, a Terra only move, Raging Storm, an Aqua only move, Tornado, a Ven only move, Vanitas's X-beams, and a few other moves unique to our traveling party. While some might dismiss this as being simply for a challenge, I see something here. These moves are unique to the four characters that use them and definitely don't seem to be widely known. So how would MF know them? Well, any Ventus who lasted to the end of the game might have seen them in use. Surely Ven could have that move and he's friends with Terra and Aqua, he could have seen either of them use them in the final fight... Vanitas's X-beams also count here. Just some food for thought on how a character could know those moves besides pure coincidence.
- My last part is that Nomura has stated that the song used in the fight gives hints as to who this person is. As we've seen in the latest Dream Drop Distance trailers and confirmed by Nomura, this Mysterious Figure looks like a younger Xehanort. Why does this matter? Part of the theme playing is Xemnas's final battle theme. Pretend Terra isn't here. All Xemnas is is a Xehanort Possessed person wielding laser blades. A body possessed whose hair has turned gray, his eyes yellow, and even his hair is changed from the original Terra's due to his body aging. The second part id Rage Awakened from Terra's Lingering Sentiment battle. Now I know what some of you are thinking, "See! Terra! You're wrong!" Hear me out. In the February trailer for 3D, at the end MF blends into a shot of Ven's armor with a Dream Eater symbol in what appears to be a standing position. A "Ventus's Sentiment" as it were, it also bears some resemblance to Vanitas's Remnant, an animated suit of its wearer in a fight, which is essentially what the Lingering Sentiment is. Also, Ven's face is never seen in the trailer, but his armor is. Just a thought. Many people find the last part of the tune odd, as it's Marluxia's battle theme in Re:Chain of Memories, but this one makes the most sense with my theory, as Ventus' comatose body is in Castle Oblivion, where Marluxia is fought.
As far as my theory goes, the question isn't why Xehanort's so young, it's why Ven is so old. Never once did we see Ven's face in any of the trailers, even the most recent one which made a point to show all of the characters needed to be saved. How this is Ven... well... my only explanation involves another timeline as MF has time travel abilities, combined with a theory I have seen on here which brings a connection up with Vanitas as well, who the original poster of that thread pointed out has a gear-motif, which seem to bear a resemblance to clock gears. All of this is merely speculation, but nonetheless I'd like to hear other's takes on this, so please, tell me what you think.