The terms Unknown (謎の男, Nazo no Otoko^?, lit. "Enigmatic Man") or ??? can refer to a several different characters in the Kingdom Hearts series:

• Xemnas in Kingdom Hearts Final Mix.
• Marluxia in Kingdom Hearts: Chain of Memories.
• Riku in Kingdom Hearts II or Kingdom Hearts 358/2 Days.
• Xion in Kingdom Hearts 358/2 Days.
• Young Xehanort in Kingdom Hearts Birth by Sleep.
• Data-Roxas in Kingdom Hearts coded.

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