[quote=@Double]
Has Goofy and Donald also gone missing? The answer to that will affect my character choice.

Basically, my thought is to play as Goofy's son, Max. A knight-in-training, Max will have swiped one of Goofy's spare shields and left Disney Castle on his own to search for his missing dad.
[/quote]

I'm gonna say that if you use your second character slot for Goofy, you can decide where he is at. Just be aware, this will keep you from having a second character.

[quote=@Fabricant451]
Does this mean Aqua is a character that could be played? 
[/quote]

YES! Definitely. All you need to do is find a reasonable story as to how she got out of the Realm of darkness. This could be done by your second character going there and saving her coincidentally or you could come up with story to have her out at the start of the RP.