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* WhatCouldHaveBeen:
** The prototype version of Pandora Hearts reveals that Gilbert is supposed to be the main character with Oz as a supporting one. The Chains are called Abyss instead. Reim is a priest possessed by an abyss. B-Rabbit is female, just like in the main story and she can possess Oz from time to time.
** It was revealed in the art book ''There Is'' that Oz was originally planned to be a girl named Tale [[SweetPollyOliver cross-dressing as a boy]] and Gilbert was a retired killer. This early version included a love triangle between Tale, Gilbert, and a dark-haired woman from Gilbert's past.
** Glen seems to be based on the 'King of hearts' character in chapter 0, based on the silhouette.
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