Replica

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A blank replica in a black coat, left behind after Dark Riku is forced out of his vessel.

Replicas (レプリカ, Repurika) are artificial copies of people. They were created by Organization XIII and first appear in Kingdom Hearts Chain of Memories.

Story

Kingdom Hearts Chain of Memories

Manipulated by Axel, the Riku Replica eliminates Zexion to obtain new powers.

The Replica Program was one of the experiments being carried out in Castle Oblivion. Vexen created twenty replicas as part of his research. While two of these replicas—Riku Replica and No. i—went on to become successful in their own right, and the six that followed would come to be used as vessels for the real Organization XIII members who traveled through time, the initial twelve were deemed as failures, barely considered to be human at all.

The public purpose of the Program was to find a way to replicate a Keyblade wielder's power by inserting a piece of their memory into a blank replica. A vessel deemed unworthy of the program was instead given Riku's data to create the Riku Replica. Said replica shows the capacity to grow in strength by absorbing other lifeforms.

The Replica Program's progress was severely derailed with the demise of Vexen.

Kingdom Hearts 358/2 Days

"Xion failed to complete its mission. If this continues, destroying it and using the next Replica as the Duplicate would undoubtedly yield a higher-grade copy. No. i was among the initial lot, which raises questions about its capabilities. At present, it is nothing short of broken. I cannot fathom why Xemnas would want to keep it."

—Saïx in the Secret Reports

With Vexen's demise, the Replica Program is rendered inoperable. The only success to come from it was Xion, the only replica from the program to develop into its own person.

As previously stated, replicas can naturally grow stronger, drain the vitality of others or be given an external power up. Xion unknowingly takes Roxas's energy and uses the Organization XIII Devices to obtain new forms. However, the method in which the replica is fashioned can have unforeseen side-effects. Xion's appearance is somewhat unstable as result of her replica body being crafted imperfectly from Sora's memories. Thus, Xion's appearance differs depending on who sees her.

Kingdom Hearts III

"Most of the Organization's members-- they traveled here from the past as hearts. And you had replicas ready and waiting. One for each of them."

—Roxas to Xemnas

The replicas of the real Organization XIII.

Saïx approaches Even and convinces him to become a Nobody once again. With Vexen's research, the real Organization XIII are able to use six replica bodies for the hearts of their time-traveling members, allowing them to stay anchored in the present time. Wishing to atone, Vexen has Demyx deliver a blank replica to Ienzo in order to provide Roxas with a body separate from Sora. Likewise, once Dark Riku's heart is forced out of his vessel, the now blank replica is used to give Naminé a body.

Vexen also repurposed the original twelve replicas, which had previously been deemed failures, into the Replica Xehanorts, each wielding a weapon of the real Organization XIII. In Scala ad Caelum, the Replica Xehanorts fought Sora, Donald, and Goofy before Xehanort himself confronted the trio.

Kingdom Hearts III Re Mind

While Sora, Donald, and Goofy battle Master Xehanort, the Replica Xehanorts attack the Guardians of Light at the Keyblade Graveyard who are trying to keep Kingdom Hearts sealed. The Replicas manage to trap Lea, Roxas, Xion, Aqua, Terra, Ventus, and Riku in a dark void, leaving a weakened Mickey to fight them. With an incorporeal Sora who time traveled from the future lending aid, Mickey temporarily disperses the replicas and pulls everyone out of the darkness.

Following Master Xehanort's desire to keep the pure light away from the Guardians, the replicas return once more, this time merging into a copy of Armored Xehanort. The Armored Xehanort faces off with Sora, who restored Kairi with the power of waking. Sora and Kairi fight the combined replicas, and they are finished off by a combined attack from all of the Guardians of Light.

Nature

"Twenty replicas were created by Vexen. The first twelve were nothing more than puppets, barely human. The prototype model was the Riku Replica, and then No. i was made."

—Saïx, explaining the replicas to Xigbar

Replicas are blank figures akin to mannequins that take the form of whatever heart or data of a heart is placed inside of it. They have the same skills as the individuals used to create them. They also have the unique ability to absorb other individuals; Xion passively absorbed Roxas's powers over time, while Riku Replica killed Zexion and absorbed him on the spot to get enough power to battle the real Riku. Riku Replica was created using data Vexen collected from fighting Riku, while Xemnas used Sora's memories to make Xion, an imperfect replica intended to siphon Roxas's powers. Over time, replicas like the Riku Replica and Xion formed identities, and therefore "hearts", of their own, becoming their own people.

It is implied that creating a blank replica is difficult and time-consuming process, as Vexen could only create one vessel for Roxas and had Demyx scour the Keyblade Graveyard to find one for Naminé during the battle between the seven guardians of light and real Organization XIII.

In Kingdom Hearts III, the real Organization XIII re-recruits Vexen to continue the Replica Program. As Vexen explains, these newer replicas become real people once given hearts, unlike previous models, which were more akin to Nobodies.

When an innate replica dies, their body vanishes into oblivion; though their hearts can persist for some time (as Riku Replica lingered in the Dark World for one year), or go dormant inside the safety of another's (as Xion did by sleeping in Roxas's heart). Upon their demise, the replica's body dissolves into their element affinity; Xion crystallized into light, while Riku Replica vanished into darkness. The newer batch of replicas vanish more akin to Nobodies do; though they can be saved from this by extracting the dying heart, which was done to give Naminé the vessel of Dark Riku.

This information is based on alternate scenes or materials and is not considered canon within the overall plot of the series.
In the manga, Vexen fashioned 44 replicas of himself.

List of Replicas

Innate Replicas

• 

  Riku Replica

• 

  Xion

• 

  Replica Xehanorts

• 

  Vex Replica No. 44

Vessel Replicas

• 

  Ansem, Seeker of Darkness

• 

  Xemnas

• 

  Young Xehanort

• 

  Vanitas

• 

  Dark Riku

• 

  Xion

• 

  Roxas

• 

  Naminé