Editing Xion

After discovering that Sora and Riku had slain all of the Organization members (except Axel) that were in [[Castle Oblivion]] at the time, Roxas, Axel, and Xion all begin spending more time together as per Roxas's suggestion and become fast friends, such as enjoying [[Sea-Salt Ice Cream|sea-salt ice cream]] together. After Xion asks Axel to be her friend, and he accepts, he stops seeing her as a hooded figure and begins seeing her as the black-haired girl that Roxas sees. Unfortunately, Xion can not summon the Keyblade, although she regains the ability on Day 96.

A series of events begin to split the trio apart: While DiZ and Naminé oversee the restoration of the sleeping Sora's memories (moving him from Castle Oblivion to [[Twilight Town]]), Roxas begins to experience the process for himself, and starts to ponder over how he is able to wield the Keyblade and doubt the Organization's motives; Axel is reprimanded by their superiors for placing his friendship with Roxas and Xion before the Organization's goals, and Xion is thrown into disarray after a confrontation with Riku at [[Beast's Castle]], who questions who she is and why she wields the Keyblade, especially after he sees her face, although he lets her go.

On Day 321, Naminé's attempts to restore Sora's memories are soon halted when Xion starts absorbing them faster, causing Roxas to weaken while she becomes stronger, as Xemnas intended. Later, Xion informs Axel of this strange situation and he tells her she could think of an answer to this problem herself. She also tells him she saw a boy today who looks just like Roxas, implying she saw Sora somehow.

On Day 352, after being tricked into fighting Roxas by Saïx at [[Halloween Town]], Xion decides to take Riku's advice and leaves the Organization. The next day, Xion fights [[Xigbar]] in [[Wonderland]] who perceives her as [[Ventus]] and knocks him unconscious. She unhoods in front of Axel who was also on the mission, shocking him, and asks him to let her go, which he agrees to, and she retreats through a [[Corridor of Darkness]]. Xion talks to Riku at Beast's Castle, wondering what she should do next, and he implores her to find Naminé in Twilight Town for answers.

After a long and grueling battle, Roxas manages to defeat her, while she regains her original appearance in his view. He doesn't seem to recall who she is, though she assures him that he will be better off now. While Roxas cradles her in his arms, she tells him that she chose to sacrifice herself to slow down Xemnas's plans, asks that he prevent Xemnas from obtaining [[Kingdom Hearts]], and tells him that she is glad that she met him and Axel. As Xion's [[body]] crystallizes and disintegrates, Roxas suddenly remembers her name and holds her hand until she disappears completely, leaving behind a single Thalassa Shell.

Though Naminé states that everyone's memories of Xion will vanish as she does, Roxas, Riku, Xemnas, and Saïx manage to retain some memories of her into the next day. By then, Roxas has returned to [[The World That Never Was]] in order to set Kingdom Hearts free, which he hopes will reunite him with his lost friend. However, he is being stalked by a swarm of [[Neoshadow]] [[Heartless]], as well as a determined Riku, who has arrived to capture Roxas to finish Sora's memory restoration. Riku looks down upon the Nobody as Roxas starts his path up the skyscraper. When Xion's lingering influence makes Roxas throw his [[Oblivion]] Keyblade to Riku, she is able to communicate to Riku, begging him to stop Roxas before he can reach Xemnas, because she believes Roxas is not strong enough to face him yet.<ref>'''''[[Kingdom Hearts 358/2 Days Ultimania]]''''', '''Interviewer:''' "When Roxas tries to do what Xion has asked of him, Riku hears Xion's voice asking him to stop Roxas. Why?" / '''Tetsuya Nomura:''' "First, we have to look at things in order. First, the reason why Roxas throws a Keyblade to Riku, and we then see a vision of Xion, is that there is a small remaining part of Xion in Roxas that wants to stop him, and makes him take those actions. The name of the Keyblade that is given to Riku suggests that it has something to do with Xion. Xion wants Roxas to set Kingdom Hearts free but doesn't want him to face Xemnas right now. She sees that he would most likely lose. So she begs Riku to stop him." [https://www.khinsider.com/news/358-2-Days-Scenario-Interview-894 Translation via Krexia and Lissar].</ref> With the message, Riku receives memories of the time he spent with Xion, shocking him for a moment, but they begin to fade as he reaches the ground.

On the eve of the final battle, Saïx tracks Lea down at the Clock Tower and points out that Lea has bought an extra ice cream bar for Xion without realizing it.

At the [[Keyblade Graveyard]], Xion accompanies the real Organization when they confront the [[Guardians of Light]] and pairs with Saïx to fight Lea and Kairi. Saïx subtly tries jogging Xion’s memory by saying [[Axel]] and [[Roxas]]’s names. When Xemnas appears and attempts to kill Lea, Xion intervenes. Stirred by this, Roxas’s heart calls out to her via Sora, causing Xion to waver further, eventually leading to the present day version of her heart leaving Sora’s to inhabit the replica vessel and displace the past version back to its proper time. With the release of Xion's heart, the memories of those who knew her return, causing Lea to remember their friendship when he was Axel. Shortly afterward, Xemnas’s imperilment of Xion and Sora triggered Roxas’s heart to fly to his waiting vessel, allowing him to stop Xemnas from executing her and Lea. Xion, Roxas, and Sora then battle and defeat Saïx.

During her time as a vessel of [[Xehanort]]'s heart and a member of the [[real Organization XIII]], Xion's eyes are golden.<ref>[https://i.imgur.com/vflxBck.png|https://i.imgur.com/vflxBck.png Hooded Xion Model's Gold Eyes]</ref> While her hood is up, her face is heavily dimmed.

At the end of ''Kingdom Hearts III'', Xion now wears a sleeveless double buttoned, collared shirt and a black belt, a short white pleated skirt and black boots that reach her mid-shin with beige color to the upper fifth, similar to Kairi's ''Kingdom Hearts III'' outfit.

==Abilities==

As an indirect replica of Sora, Xion's fighting style as a playable character is very similar to his. After absorbing many of Sora's memories using the Organization XIII Devices, Xion is able to replicate Sora's Limits from ''Kingdom Hearts''. However, Xion's movement is quite similar to [[Limit Form]]'s, jumping back and stepping forward between attacks and slashing through the enemy in the finisher. Like Roxas, she thrusts with one hand and her finisher resembles the {{c|Vortex|ability}} ability. Before Xion obtains the Keyblade herself, she is limited to simply shooting basic spells from her palm.