I'd rather none of them have crushes on anyone. Kingdom Hearts is one of the few things untouched por ridiculous sexual drama...so, no, I would say he doesn't have a crush on anyone just to keep it fair, but that doesn't mean I won't think about yaoi/yuri.
Its been implied a few times in KH and KH2: Example in KH2 at Port Royal when Will and Elizabeth were imbracing each other Sora was blushing and Goofy and Donald were teasing him becuase he was thinking about Kairi...I cant remember a few other times it was implied but I do remember similar occurrences in the game
I believe she is someone special to him but I don't think he likes her the way I protray her liking him. It seems like there más friends, could there be something sure of course but who knows. So I say the only way to get a true answer is to cwontinue to play the games.