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...What? Vanitas IS an original character. Yes, he has Sora's face, yes he was originally the darkness of Ven, but he's still an original character :/
Actually the Phantom is visually based off of one of Disney's books Peter and the Shadow Thieves. So it's, more or less, a spiritual successor to said book.
Hearrless and Nobodies weren't made until between BBS and KH1. AFTER Terranort became ATW's apprentice.