She is one of the members stationed at Castle Oblivion during Kingdom Hearts: Chain of Memories and is part of an internal struggle between the senior and rookie members. Larxene also appears as a playable character in the non-canonical Mission Mode] of Kingdom Hearts 358/2 Days and is the first playable female character in the series.
No. 12 in the Organization. Larxene conspired with Marluxia to take over the group, and intended to pull Axel in as well. However, her abrasive, unfeeling personality proved her downfall—provoking Sora's anger was a fatal error.
Larxene was discovered by Xigbar and became the twelfth and only female member of Organization XIII. Shortly after joining, she found Axel and engaged in a conversation with him. She asked him how she looked in her new outfit, and when he did not produce a response, she took it as a sign that he found her unsatisfying to talk to. Axel explained that he was simply confused as to why she started talking to him for no reason, and that it wasn't that he found her presence unappealing, he simply found it "nothing". After a moment of silence, Larxene quietly complained that the castle was boring, and then bid goodbye to a still-confused Axel.
Some time later, she met another new member, Marluxia, with whom she is well-acquainted at this point. After asking him how he arrived at the Organization, the two neophytes agreed that the castle was boring. The discussion soon shifted to their roles in the Organization, including the importance of having hearts. In a surprisingly profound statement, Larxene said that having a heart was painful, and wondered if Nobodies like her and Marluxia were better off not regaining their hearts.
As the two walked off together, they started formulating plans to overthrow Organization XIII, setting the mood for Kingdom Hearts: Chain of Memories. There, she is assigned to Castle Oblivion to help conduct experiments on memories; within this castle is Namine, a young girl and Nobody with the ability to manipulate memories. Sora is led to Castle Oblivion by Marluxia as part of his and Larxene's plan to obtain the power of the Keyblade with which they could take over the Organization. Joining in on this plot is their fellow member Axel, one of Larxene's closer friends; however, unbeknownst to her or to Marluxia, this is all a ruse on Axel's end, as he is assigned by the Organization as a double agent to gather evidence of their plan and, if their suspicions proved true, eliminate them.
As soon as Sora enters Castle Oblivion, Namine began manipulating his memories as per Marluxia's orders; soon he begins to gain false memories of Namine being a childhood friend until all he is unable to remember is her name. At that point, Larxene confronts Sora directly, revealing Namine is being held hostage in the castle, and attacks him viciously, revealing a lucky charm Namine had apparently given him years ago, motivating him into remembering her name. In reality, the charm is that of his friend Kairi, having changed shape by Namine. Larxene fights Sora, taunting him and calling him heartless for "forgetting" about Namine, before being defeated (something she would never admit) and escaping.
Larxene is later approached by senior member Vexen, who offers to help her, Axel, and Marluxia evaluate Sora's power with a replica of Sora's best friend, Riku. As per Larxene's suggestion, Vexen decides to have Namine alter the replica's memory so that it would think it is the real Riku, much to the replica's chagrin. She even goes as far as beating up the replica to subdue it when it tries to resist. As a result, Sora clashes with the replica over protecting Naminé, thus motivating Sora into ascending further up the floors of Castle Oblivion.
Larxene is an exceptionally capable fighter; both times she talks to Sora, she is able to kick and jab him repeatedly faster than he can retaliate, and send him flying through the air with a single kick; the second time she does this, she heavily injures Sora to the point that he can barely stand. She is also strong enough to hold the Riku Replica by the head, and easily toss him across the room with one hand. Her strength is clearly known by many of the characters, such as the Riku Replica who claims to fear nothing, yet cowers at Larxene.
Larxene's physical fighting skills resemble that of a ninja. She uses her knives between her fingers to act like claws, and is able to infuse them with electricity and throw them at Sora. She is also the most agile member of the Organization, often using quick kicks and jabs to produce extra pain to the opponent. Along with her manipulative nature, this sadism earned her the title "Savage Nymph".
With magic, Larxene is able to able to call down lightning upon the battlefield, as well as to perform levitation and local teleportation. Her sleights and special abilities all involve her use of these abilities.
In Kingdom Hearts II Final Mix, she can be battled as an Absent Silhouette and as data, but this time she uses completely different tactics. She can split herself into multiple copies that attack Sora individually or in concert, and her attacks focus more on physical strikes than magic.
However, she still uses some thunder magic, the strongest of which is a revolving wall of ball lightning similar to Hades's wall of fire. By using the Reaction Command "Other Break", Sora can stun her by throwing her "back into herself". This battle makes Larxene one of only five Organization XIII members shown to be able to make full-body copies of themselves, the other four being Marluxia, Vexen, Zexion, and Xemnas.
In Kingdom Hearts 358/2 Days, Larxene has a Limit Break called Voltic Rush. During Voltic Rush, Larxene rapidly slashes away at her enemies, dealing lightning damage.
During Larxene's Final Limit, Larxene darts around the field while enveloped in lightning, making her even faster. She also deals even more lightning damage to enemies.
WeaponLarxene carries a set of eight throwing knives between her fingers in battle. Her main set of knives are collectively called Foudre. Each knife appears as one of the Organization insignia's spikes in yellow and blue. Larxene will either throw these weapons at her opponent, or speed by them, slashing them with the knives still between her fingers.
The knives that she carries can also be used in close quarters combat for finishing blows. All of Larxene's knives have French names, and these names are references to natural phenomena like wind and storms. In the French version of Kingdom Hearts 358/2 Days, all of Larxene's weapons have German names.
Role in the series
Being deemed a traitor, Xemnas naturally declined her resurrection into Villain League ranks. This left her to be brought back by Axel instead. The reason she agreed to this "goodness" thing at all, was purely for the sake of messing with Xemnas simply for letting her stay dead, and nothing else. Even when reformed, she is pretty much still the same, only the worse she would ever do is be mean even to allies. She is among the Nobodies very skeptical of the Lodgers being capable of stopping whatever Xehanort is planning, but she is amazed they haven't given up by now, and, as she quoted: "May be very impressed by them". Though she is not hesitant to mock their misfortunes and state out past failures like an egomaniacal witch with a liking to rub it in their faces. In a nutshell, though she's showing being reformed, it doesn't mean it's a complete necessity (for her) to change her attitude and personality.