Demyx (voiced in Japanese by Kenichi Suzumura and in English by Ryan O'Donohue) is part of the main group of antagonists in the Kingdom Hearts game franchise.

He is number Nine in Organization XIII, and uses water magic and his Sitar named Arpeggio to fight. At the current point in the story, he's changed course on where he stands, and is operating seemingly on his own side, though debatably working with Sora's crew.

Demyx has blondish-brown hair that he wears partially up in a mohawk, and down in the back in a short mullet. His eyes are a tourquoisey-blue. He also wears the standard Organization XIII wear, with the fitted black cloak, black gloves, black pants, and black boots with silver top trim.

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