*POSSIBLE SPOILERS*


I'm not sure what he's wearing because his image is so dark. But it's clear that he's Mickey. Where do you get the idea that Sora, Riku, Kairi and everyone are older in KH2, BTW? I wouldn't say Kairi having a long hair in Another Side Another Story ending is enough to prove that. She might have just grown it, that wouldn't take many months. Besides, how do we even know that's Kairi? If you think the two-sworded guy and the blind guy are Sora and Riku when they're older, I doubt. In KH: Final Mix, you fight the two-sworded guy, and he says he's a mere shell. In Deep Dive, the blind guy tells him he looks just like Sora. I think this two-sworded guy is a dark version (or possibly future version) of Sora, and not the Sora we've used to know. Finally, you can see Sora floating in the air at the end of Deep Dive. He still looks as young as in the original game. So it's not impossible that they're still kids in the sequel(s).

Just like you, I'd still like Sora, Kairi, Riku and others in the sequel to be similar as in KH. Haley Joel Osment, Hayden Panettiere and David Gallagher returning to act Sora, Kairi and Riku wouldn't be a bad idea, either.