[If that's the case, then his body had started replacing his lost heart a lot earlier than Roxas had thought. Or maybe it was another example of how he was a special Nobody, an exception to the way things worked, because his original heart was still out there and not lost. It just wasn't inside his own chest.]

Oathkeeper.

[He lowers his hand then as his eyes narrow, just a little. With the 'enthusiastic greeter' theory quashed, he'd thought, assumed that Terra's misidentification was some kind of mistake, and working out who they both knew and were connected to had cleared it up.

But Terra's talking with that unnerving familiarity again. A new keychain? When would he have ever been in a position to see an older one?]

Why are you talking like you've seen my Keyblade before? And why did you think I was someone else at first?

[Does he just have one of those faces? Except his looks a lot like Sora's.]