Xemnas is the Nobody of Xehanort, Rank I within Organization XIII, the ruler of The World That Never Was and the main antagonist of Kingdom Hearts II. He wields the element of Nothingness, and channels his element into his weapons, red blades of energy called Ethereal Blades. He commands the Sorcerer Nobodies. Xemnas, as the superior, is the first member and founder of Organization XIII, with all other Nobodies under his control. He is the most powerful member, so much, that Marluxia would not dare to face him even with the support of Axel and Larxene until Sora was completely under his control. Furthermore, Vexen immediately complied with Marluxia's order to eliminate Sora when he made the empty threat that he would report Vexen's failure to the Superior. He also appears to be the Organization's most intelligent member.

Despite his original name being Xehanort, he uses an anagram of his mentor's name: Ansem, due to Xehanort stealing the name prior to discarding his heart and body.

His complete being, Xehanort, may also have an appearance in Kingdom Hearts Birth by Sleep, due to his possible connection to Aqua, whose armor resides in the Chamber of Rest.

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