Ryo Asuka, also known as Satan, is the main antagonist of Devilman (Film). Unlike the manga, he is a devilman/demon with no connections with Angels or even God.

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In the film, Ryo Asuka, while human form, is an Asian kid with blonde hair. As Satan, he is portrayed in a more masculine appearance, whose design bares a slight resemblance to Akira Fudo's Devilman form, in contrast with his manga counterpart who is supposedly Intersex.

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  • Ryo Asuka/Satan is played by Yusuke Izaki, who was at the time a member of a J-Pop band "Flame". Devilman was his first acting experience.