Xemnas

Xehanort arrived at the Radiant Garden with no memory of his past, he became Ansem the Wise apprentice and began studying the heart, he became obsessed with the findings of the door to darkness and heart of all worlds he was consumed by the darkness and thus. He was made into a heartless and since a heartless was created so was a nobody the heartless took his former master's name Ansem and the nobody switched his name to Xemnas. With the help of the other former apprentices of Ansem the wise Xemnas formed the nobody group Organization 13. Organization 13 strong hold is in a world in between light and darkness called the World that Never Was. There Xemnas was able to create his own Kingdom Hearts. Xemnas completed his Kingdom Hearts but thanks to Ansem the Wise it exploded and the hearts fell damaging it badly and more heartless coming out. Xemnas met his demise at the hands of Sora and Riku.

Abilities

Xemnas is able to control the elements of nothingness. He is able to wield to red beams of pure energy which are calle aerial blades. During his fight with Riku and Sora he has a knight form. The first time he's in this form he can use other Organization XIII members weapons. For instace Axel's chakram, Xigbar's gun arrows, xaldin's lances and a few others.