Umm... here, actually. He showed up in Traverse Town, like everyone does. And I think I know what's going on here.
[This is going to be confusing, but confusion is better than panic.]
It sounds like you're from before the Organization was stopped. It's gone now - Sora and Riku defeated Xemnas and Xigbar and everyone else a couple of years ago. Everything was put back like it should have been, but the Darkness started surging again just over a year ago, and now it's pulling people in from worlds we've never heard of and even from the past. That's what happened to my brother - he's from way far back.
/singed
[This is going to be confusing, but confusion is better than panic.]
It sounds like you're from before the Organization was stopped. It's gone now - Sora and Riku defeated Xemnas and Xigbar and everyone else a couple of years ago. Everything was put back like it should have been, but the Darkness started surging again just over a year ago, and now it's pulling people in from worlds we've never heard of and even from the past. That's what happened to my brother - he's from way far back.