Xemnas, the Superior of the In-Between (狭間の指導者 Hazama no Shidōsha?), is the Nobody of Terra-Xehanort. He is the leader of the original Organization XIII, the former ruler of The World That Never Was, and a member of the True Organization XIII. He serves as the main antagonist of Kingdom Hearts II and as a supporting antagonist inKingdom Hearts 358/2 Days and Kingdom Hearts 3D: Dream Drop Distance.
Xemnas wields the power of nothingness, and he channels this into his weapons, red blades of energy called Ethereal Blades. He commands the Sorcerer Nobodies. Xemnas, as the Superior, is the founder of Organization XIII and has dominion over all other Nobodies. He is also the Organization's most powerful member, to the point that Marluxia would not dare to face him alongside Larxene and Axel until Sora was also under their control.
In the Pooh's Adevntures series, Xemnas has not appeared yet, most likely due to his decision to stay behind the scenes while the Ancient Minister and Bowser do all the work for him and the other Seekers of Darkness. He is a major villain in the Sora's Adventures series, where he was the one who suggested that they use a psychopathic man named Ralphscoe to serve as a faux figurehead for the Seekers' operations.