This is off topic but I think that it is odd that in all the scans we have seen Terra, Ven, MX, and DS....but no Aqua. I wonder why.
As for the thread I am most excited to play as Terra...he appears to be a mature character unlike most previous KH characters. I guess whatever hapens in his storyline will influence whom I choose next, like if something interesting comes up that it unanswered concerning Aqua or Ven.
Ultimately it will end up where all the people meet at sunset horizons so it's going to be interesting to see how they all get to that point, whether together or apart.