Larxene

Larxene, the Savage Nymph is number XII in Organization XIII, and it's only female member. She is the lowest on the Organizations numbering system after Roxas, number XIII. She plays a large role in Sora's storyline during the events of Kingdom Hearts: Chain of Memories.

Castle Oblivion
Larxene is one of the Organization members assigned to work under Marluxia in Castle Oblivion, which Marluxia holds as a fortress for the Organization's research into memories. Marluxia and Larxene (though Axel and Vexen aid them, they are in fact working against them in secret) conspire to usurp control of the Organization and the Nobodies from its leader, who at the time is unknown to Sora. The Organization reveals themselves to Sora slowly, at first appearing to be helpful by providing him with the means to fight within the castle (Sora had lost all of his abilities due to memory loss). Marluxia fights in disguise to instruct Sora in the use of battle cards, and Axel later fights Sora to test his strength. Larxene fights him next, with the intention of antagonizing him, and is defeated. She laughs it off later, telling Axel she is winded from "throwing the fight", though Axel does not buy it.

After she loses the battle and speaks to Axel, Axel makes on off-hand comment about using a captive girl, Naminé, to aid them in taking control of Organization XIII. Larxene, believing Axel to be in on the plot, voices her support for it, but as she leaves, Axel remarks that she should have kept it quiet.

Vexen and Axel
Soon after Vexen battles Sora to observe him, Marluxia and Larxene begin to doubt his sincerity. They decide to compel Vexen to pursue Sora by threatening to tell "the Superior" of the failure of the Riku Replica, despite Vexen's confusion at the orders, since Sora's death would ruin Marluxia's plans to use him against the Organization's head members. Although Vexen is number IV and Marluxia number XI, Marluxia had been given authority control over the castle; this coupled with Vexen's fear of Xemnas compels him to engage Sora in a simulated Twilight Town. Vexen fails, and plans to tell Sora about Roxas in order to break Marluxia's plans for controlling Sora. Axel cuts him off by killing him just before he speaks, having been ordered to eliminate him as a traitor to the conspiracy. When Axel returns, Larxene says that they hadn't been sure if Axel would have done it; in this way, Axel earns the trust of both Larxene and Marluxia.

Death
As Sora continues to make his way toward the top of Castle Oblivion, both Larxene and Marluxia leave Naminé to be guarded by Axel. However, Axel allows her to escape. Shortly afterwards, Larxene appears before Sora after the Riku Replica had taken a potshot, weakening him. Furious over Axel's betrayal and Naminé's interference, she reveals to him the true nature of the Riku Replica as well, also elaborating on Naminé's misdeeds. Naminé tries to stop Larxene from killing Sora, but she is knocked aside. And just as she is about to move in on the Keyblade wielder, Goofy pushes her away and Donald heals him. Sora, angry at Larxene's cruelty, initiates a final battle with the female Nobody. Though she fights with powerful thunder magic and her kunai, Sora defeats her, making her the first Organization member to fall at his hands.

Personality
Although Larxene is normally smiling and even winking at times in-game, she has a cruel, sadistic personality and enjoys seeing others suffer hardships and anguish. In the manga, she favored a book called the "Marquis de Sadis", a pun on the man who sadisim was named after. She taunts Vexen incessantly after he is threatened with charges of treason and incompetence from Marluxia, and toys with Sora before fighting him the first time. After she discovers Axel's betrayal and sees that her and Marluxia's plans have fallen apart, her friendly manner vanishes and she attacks Sora in a rage.

Fighting Style
Larxene uses small knives set between her fingers that form a pair of claws. She can also fling them at Sora as lightning projectiles. And though she can levitate and teleport, she also possesses very formidable agility that is a step up above the other Organization members, which combined with her sadist methods gives her good reason to be called the "Savage Nymph".

Along with her physical skills, her use of magic is deadly as well. She can summon bolts of lightning to rain down from the sky, in a focused form as well as one that strikes a large area. In addition, she can also bind a person in place with tendrils of lightning, allowing her to deal a great amount of damage without the possibility of retaliation.

In Kingdom Hearts II:Final Mix, can be battled, complete with new fighting tactics. She can create copies of herself that can swarm Sora independently or attack simultaneously, and her attacks are more heavily oriented toward physical strikes rather than lightning spells. Sora can use a reaction command to throw one of Larxene's copies bodily at her, resulting in a stunning collision that leaves her vulnerable to attack.

Triva

 * In the japanese version, Larxene was voiced by popular seiyuu Yuko Miymura, who was famous as the voice of Asuka of Evangelion. This marked as her first role with Square Enix.

Video
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Larxene (CoM battle)

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Larxene (Final Mix+ battle)