Tetsuya Nomura is currently attending San Diego Comic Con, where he's been busy signing autographs with Hideo Kojima. There he was asked a few questions by Siliconera regarding his work on the Play Arts Kai figures.
Among those were about the similarites between Nomura's Batman design and the armours in Birth by Sleep, but according to Nomura, it was actually designed years before Kingdom Hearts was even conceived:
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