yep
Yes.
Sora, Kairi, Riku, Donald, and Goofy!
Donald and Goofy are Sora's sidekicks thoughout the game. Donald specializes in Magic and Goofy in defence. They are very loyal allys
sora is the main character in kingdom hearts. Goofy and Donald travel with him. He lives on destiny island.
No one except Sora Donald and Goofy
Sora, Donald goofy and Beast in times
You can buy staffs and shields for Donald and Goofy, but not keyblades for Sora.
you get them and all the characters as the game progresses
nope, the character you replace them with does
No, Sora Donald and Goofy are in a different Castle
In Kingdom Hearts II you find the recipe for the Ultimate Weapon in a chest in Twighlight Town by the pods where Donald and Goofy were sleeping.
You can only use Sora, Donald and Goofy, and Auron sometimes