Real Organization XIII
The real Organization XIII (真のXIII機関, Shin no Jūsan Kikan?), also known as the thirteen seekers of darkness (13人の闇の探求者, Jūsannin no Yami no Tankyūsha?) or simply Organization XIII or the Organization, is a group consisting of thirteen different incarnations of Master Xehanort who seek to reforge the χ-blade and unlock the original Kingdom Hearts to remake the world. They serve as the final antagonists of the Dark Seeker Saga.
The true purpose of the original Organization XIII led by Xemnas was for each of the Nobody members to host a fragment of Master Xehanort's heart, turning them into clones of Xehanort, but the members' unforeseen independence made this goal impossible to realize. However, in anticipation of this failure, Master Xehanort had arranged to send Ansem, Seeker of Darkness back in time to his youth, to meet Young Xehanort and become a portal[?], travelling to different periods of time and gathering different incarnations of Xehanort who would be added to the ranks of a new Organization.
Due to the time travelling nature of many of the hearts comprising the Organization, future members first appeared in Kingdom Hearts with at least one making an appearance in every game since. As a group, it was first alluded to by Yen Sid in Signs of What's Next when he claims that one Keyblade Master will not be enough to counter what is "not a single one of Xehanort", before making its official introduction in Kingdom Hearts 3D: Dream Drop Distance.
Unlike the original Organization XIII, the real Organization XIII is not composed exclusively of Nobodies; some of the members are complete people, while others are time travelling hearts hosted within replica bodies. Despite full knowledge of the purpose of this new Organization, many members use it as a means to fulfil their own independent goals, rather than out of loyalty to Xehanort.
Before Kingdom Hearts Birth by Sleep
Young Xehanort was visited by his future self's Heartless Ansem, Seeker of Darkness and told of the great plans Master Xehanort has in store. Given his task, but limited by the rules of time travel, Xehanort left his body behind and journeyed into the future to make contact with the right hearts needed for the backup Organization.
Before Kingdom Hearts
Young Xehanort recruited Vanitas, whose heart is incomplete, and brought his heart with him.
Young Xehanort arrived after the creation of Terra-Xehanort, and collected his heart as well.
Young Xehanort arrived during the time Ansem, Seeker of Darkness existed within Riku's body, and collected his heart as well.
Kingdom Hearts 358/2 Days
Young Xehanort arrived in the days after the original Organization XIII finished filling its ranks. He collected the heart of Xion, before her personality had taken shape.
Kingdom Hearts Chain of Memories
Once the Riku Replica was brainwashed into believing himself the real Riku, Young Xehanort collected his heart as well.
Kingdom Hearts coded
With the demise of Ansem and Xemnas, both Terra and Master Xehanort began reviving. However, before Terra could escape, Young Xehanort arrived and implanted Terra-Xehanort's heart into him, forcing Terra's own heart into Xehanort's guardian.
Young Xehanort arrives at the Heartless Manufactory just as Ansem the Wise's apprentices revive, and before they awaken. He wakes Braig and informs him that, due to the failure of the original Organization XIII, the backup Real Organization XIII must be completed. Braig agrees to be turned back into his Nobody, Xigbar, and they select Isa to join as well, in the form of Saïx, before leaving.
Kingdom Hearts 3D: Dream Drop Distance
Although Even was also revived, he remained comatose due to the grievous wounds Axel had inflicted upon his body when he destroyed Vexen. Once he finally awoke, he was approached by Saïx and invited to return to being Vexen, under the pretense of continuing his research on replicas, while in truth plotting to sabotage the Organization's plans to absolve the pair's prior misdeeds.
With Vexen's stock of replicas, Young Xehanort was able to deposit his own heart, as well as those he had collected from the past, into new bodies, allowing them to begin operations. Vexen and Demyx were demoted to reserves, while with their new bodies, Ansem, Xemnas, Young Xehanort, Vanitas, and the Riku Replica, now called "Dark Riku", work together to put Master Xehanort's plan into motion, interfering with Sora and Riku's Mark of Mastery exam within the Sleeping Worlds in order to lure Sora to The World That Never Was so that they can abduct him and make him one of Xehanort's vessels.
Having baited Sora to The World That Never Was, Young Xehanort is aided by Xemnas and Xigbar in trapping the Keyblade wielder deep within the abyss of sleep. Afterward, he ferries the boy to Where Nothing Gathers in the real world and convenes eleven of the Organization's current thirteen members, excluding Xion, Vexen, and Demyx to await the completion of Master Xehanort's revival.
Master Xehanort attempts to make Sora into the final vessel, but when Sora is rescued by Riku, Mickey, and company, the Organization disperses to their proper times,[?] while Master Xehanort remains confident that in time he will complete his Organization.
Kingdom Hearts III
By the time the real Organization XIII is ready to re-enact the Keyblade War they are composed of thirteen active members, with two additional members serving as reserves. Additionally, Vexen creates twelve newer replicas from each of the active members of the Organization save Master Xehanort himself, to replenish their ranks should the need arise. Despite twelve of the members being defeated, Master Xehanort summons their remnants into the Replica Xehanorts when Sora confronts him at Scala ad Caelum.
Notes and references