I just had a thought. This wouldn't really work for X--that as far as we know, is taking place in reality--but perhaps Unchained X? That may or may not be in the Realm of Sleep?
If we're going off of the theory that Ventus is somehow the Player, what if the reason Player looks vastly different from Ven is because Ven
is dreaming it all?
Forgive me if someone's already stated this, but dreams are weird. And I know that a lot of times in mine, I'm actually someone else (or watching the events with other people unfold from behind the scenes). So what I'm proposing is that Ven (more or less) is dreaming about what really happened to him and his friends back in X, but because of the wonky property of dreams he's imagining himself differently or imagining someone else in his place?
Player does remind me of Ven a bit. The fact that he/she talks so little at first is pretty similar to how Ven was after his heart was shattered and he was recovering. And as Player's made friends and grown, he/she's become much more passionate about things and talkative (also like what happened to Ventus).
And even some of the things Player's been doing lately kind of reminds me of Ven. The speech he/she made about friendship, the fact that he/she clearly stays behind (being pretty self-sacrificing in that) and doesn't become a Dandelion because he/she is worried about all the Union wielders who didn't make the Dandelion cut.
Edit: The whole "training to use the darkness" thing that Player does in X is also similar to BbS. And, of course, what the Player ends up doing in the end, and that they never were on board with that idea to begin with.
IDK. Just some food for thought. I'm probably way off on all of this, though!
@FudgemintGuardian Riku at least appears to have some yellow buttons like Sora does, so hopefully that hints there's more yellow incorporated in the other parts of his outfit that we can't see now.
Also, I feel like Riku's outfit now is supposed to represent--maybe even moreso than ever before--that he walks the Road to Dawn, and uses equal parts light and darkness.
In DDD, he finally got over some misconceptions about the darkness that he had and learned that it isn't inherently bad, and that he now has full control over it and an immunity to it (he also has learned how to absorb the darkness and turn it to light, or whatever), so maybe this outfit is even more of a hint at his development.
Before he never would've dreamed about wearing an Organization cloak if he could help it, I imagine; it was just full of bad memories for him. But now he's accepted who he is, and his past, so maybe he's even now showing that through his wardrobe?
Or maybe he's trying to throw the Organization off again. Who really knows? I hardly think that would work at all a second time, however
Heck, it didn't even really work the first time!