The Nobody of Master Xehanort. He is the leader of Organization XIII.
Xemnas is a member of Organization XIII and he is the number 1 and leader of it. He formed the Organization for hooking 13 people to Kingdom Hearts and divide Xehanort's heart for 13 vessels. After Sora became a Heartless, Xemnas found Roxas. Xemnas later came across Sora at Hollow Bastion for testing Sora's abilities. He was seen at Dark Meridian with Roxas six days after Roxas was born as he asks him "What about you? Do you remember your true name?" After Roxas couldn't say, Xemnas said, "You have been with us for six days now. The time has come." When he touched Roxas, he mouthed "Sora".
He talked again with Sora at Hollow Bastion accompanied by his other members Demyx, Xaldin, Xigbar, Luxord, and Saix, having their faces hidden.
Xenmas appears again in The World That Never Was standing in a high tower of the Nobody castle. Saix asks whether Kingdom Hearts is complete which Xenmas replies that it will be complete soon. He then meets with Ansem the Wise, and mocks him for inspiring him to go where Ansem himself could not go.
Sora and his friends went to the top of the tower where Xemnas tells Sora, Riku, and King Mickey to fetch him more hearts, but when they refuse, he asks them why do they hate darkness. Mickey replies that they don't hate darkness, but it is scary and knows that the world is made of both light and darkness, and asks why they are afraid of darkness. Riku added that it is because of who or what's lurking inside that darkness.
Xemnas asks a question:
If they accept the darkness, yet choose to live in light, why do they loathe those who are nothing, having been turned away from both the darkness and the light?
Riku replies that they endangered the worlds and he has no other choice. Xemnas fights Sora in an arena of nothingness.
He is defeated but still alive. Sora and his friends try to stop him but Xenmas is absorbed into Kingdom Hearts, turning it into a place like The World That Never Was with a giant fortress in the middle. Sora, Donald, Goofy, and Riku defeat him in his Keyblade Armor (Xehanort's old armor) wearing form. Xemnas thinks that he needs more hearts and more rage, but Sora tells him that hearts are more than just anger or hate, and asks if he remembers, which he doesn't, before seemingly fading back into the darkness.
Xemnas attacks again, having merged with a gigantic mechanical dragon. After the battle, he takes Sora and Riku to a realm of nothingness with Xemnas wearing a robe representing light and darkness. He says that if both light and darkness are eternal, then so too must be nothingness. Riku and Sora say this is true, but that does not mean Xemnas is eternal. They fight with Xemnas manages to wound both Sora and Riku. They manage to finish him off as Xemnas fades into darkness, making him the last member to be defeated.
After both Ansem and Xemnas were destroyed, Xehanort returned.
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