* ActorAllusion:
** Vexen. Who would've guessed that [[Manga/{{Bleach}} Uryuu Ishida]], of all people, would become a mad scientist? Captain Kurotsuchi must've rubbed off on him.
*** Let's see, a nice person who became an [[SmugSnake Smug]] {{Jerkass}} and an [[InsufferableGenius Insufferable]] [[EvilGenius Genius]] after being corrupted by the powers of darkness. Sounds like [[Anime/DigimonAdventure02 Ken Ichijouji]] after he became the Digimon Emperor.
** Larxene shares many similarities to [[Anime/NeonGenesisEvangelion Asuka]], basically sharing her bitchy attitude but with fewer redeeming qualities and an even more damaged psychosis. Tellingly, [[WordOfGod Nomura]] said that Larxene's voice was the first one cast for ''RE:Chain of Memories'' and that YukoMiyamura was always his personal choice.
* DawsonCasting: In the remake, Sora is supposed to be fourteen at this point like in the original ''Kingdom Hearts'', yet the voice of Haley Joel Osment sounds nothing like a kid anymore. Averted in the original Game Boy Advance, however, because Sora's voice came from sound files reused from ''Kingdom Hearts''.
* FanNickname: The [[spoiler:Riku Replica]] is occasionally referred to as "Repliku". It's even his official name in the D-Report in the German version.
* FlipFlopOfGod: Nomura stated in an interview that Nobodies do not age (with the exceptions of Roxas and Naminé). However, ''Birth by Sleep'' and ''Dream Drop Distance'' appear to contradict this with the ages of Braig and Ienzo, though [[spoiler:it is revealed that Xigbar was not going grey because of his age]], leaving it as a possible case of ImmortalityBeginsAtTwenty.
* MarthDebutedInSmashBros:
** The Diamond Dust and One Winged Angel keyblades are in this game. They actually came from ''Final Mix'', which nobody outside of Japan saw without importing it (at least until 2013 and the 1.5 HD Remix).
** The Neoshadows, who only showed up in the original game in the secret ending, but were limited to a secret cutscene, and similarly to the above Keyblades were introduced as actual enemies in ''Final Mix''. They return in this game.
* NoExportForYou: Europe and Australia had to wait nearly five years later when [[RemadeForTheExport the game was remastered for the PlayStation 3]].
* TheOtherDarrin: Every Organization member except Axel[[note]]Axel arguably still applies for the English version; due to NonDubbedGrunts, Creator/KeijiFujiwara was used in the English version as well, and later English installments replaced him with Creator/QuintonFlynn[[/note]] got a different and professional voice actor once they appeared in a fully-voiced game.
* WhatCouldHaveBeen:
** Deep Jungle was intended to have made a return. The card for the keyblade obtained from that world was actually programmed in the game, but due to copyright infringements, Deep Jungle was never featured. The Dive to the Heart was planned at some point. It presumably would've served as the gameplay tutorial, which is instead a normal conversation and fight in Traverse Town.
** Marluxia was originally planned to be female, but because [[spoiler:he's TheStarscream]] and his [[TheDragon Dragon]] is Larxene, the only ''other'' female, they decided to make him male to avoid UnfortunateImplications.

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