The Heartless of Xehanort, though he's taken a liking to calling himself Ansem, his former teacher. He is a enemy of Sora.
Ansem appears first as a figure in a brown robe to his original form, Xehanort by time traveling. He helped Xehanort go time travel to find 12 versions of Xehanort in the future. In the present, Ansem came back to his and Sora's homeworld, Destiny Islands and destroys it.
He appears to Riku after he has lost to Sora in Hollow Bastion. He then possesses him. In control of Riku's body, Ansem created the Keyblade of People's Hearts from all of the princesses, including Snow White, Cinderella, Belle, and etc. He tests it on Maleficent, transforming her into her dragon form. After she is defeated, Ansem admits that Maleficent failed to see that Xehanort is entirely using her all along and steps on her robe, finally disappearing.
After Sora gets reunited with Kairi, Ansem tells him that her heart is inside Sora's and that he plans to get it. Sora refuses and the two fight. Ansem has lost and retreats.
He expels himself from Riku and reshape his body into his original self. Now that the final Keyhole is open, Ansem plans to kill Kairi. Donald and Goofy make a stand against him, but they can't since Sora isn't there. Just as he is about to kill the three, Riku has projected himself from Ansem's body and manages to get control enough to let Donald, Goofy, and Kairi escape. Ansem manages to win against Riku as his heart is out of his body and he is in complete control. He envelops himself by the darkness from the keyhole and travels to the End of the World and Kingdom Hearts.
In End of the World, Ansem tells Sora about Xehanort's philosophy: that all worlds and hearts begun and end in darkness. Thus, darkness is the heart's true essence. Sora refuses to believe that. Ansem summons Guardian Heartless and the Darkside Heartless to assist him in his battle with Sora. Ansem puts Sora, along with Donald and Goofy, into an endless abyss where he merges with a monstrous Heartless ship called World of Chaos.
After being weakened, Ansem opens the Door to Darkness in order to get enough darkness to take over the universe, but is destroyed by the light of Kingdom Hearts, allowing Riku to get his body back.
After the destructions of Ansem and Xemnas, Master Xehanort returned.
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