I'm surprized. I thought many people would've gone with Terra.
My pattern will probably be Ventus, Terra, Aqua.
I want to see the game from Ventus' point of view first since he almost feels like the main character, what with Sora and Roxas connections. I'll also want to wonder and speculate why Terra has so many connections to the antagonist, and possibly see some connections Ventus has with Sora and Roxas.
Then I'll want to play as Terra to understand why he was with the antagonists so much, and possibly see some connections he may have with other characters in the KH series.
Lastly, Aqua so I can play through the story understanding Terra's motives.