Someone pls give me the hole story of xion. this is the only game of the franchise i dont get. well xions part, everything else i get baut pls give me the whole story of Xion.

Xion was an imperfect replica of Sora created by the Organization in order to have a Keyblade on their side in case they couldn't control Sora. She was created from Sora's memories. His strongest memories were that of Kairi, so that's why she looks like Xion. Eventually Xion learned what she was and what Xemnas was after, so she intended to find Sora and become one with him again to stop Xemnas. But Axel stopped her. She then resolved to get herself destroyed, but since she knew Roxas couldn't do it willingly, she gave him no choice, and forced him to kill her. When she died, she awakened Roxas's ability to use two Keyblades, but since she was a being created from memories, everyone forgot about her when she faded.

http://www.khwiki.net/Xion

 

Everything you need to know about Xion.

Organization XIII came into being, and seeking hearts, had Vexen begin his work in the Replika program, creating at least two, with the intention of creating more. As the first was a very basic prototype, it was not given a designation, while the 2nd was named no. i. It was activated shortly after Roxas joined the organization, with the intent that she borrow his powers and become a Keyblade wielder. Shortly thereafter the events of CO transpired, and Sora's scattered memories passed from Roxas.his Nobody, onto Xion (no i + X). Sora's most intense memories were of Kairi, so she began to take on that appearance. She spent more time with Roxas, becoming friends with Axel after he returned. Unfortunately she was unsatisfied with the secrets surrounding her existence, and, after several failed missions ran away. She met Riku and/or Namine who informed her of her connection with Sora, so she chose to die so Sora might come back.

 

It'smore complicated than this, but it is generally true enough. There are some areas I glossed over, or minimized, but it doesn't help that not all the facts are known.