Before Kingdom Hearts χ
Ava is given a Keyblade forged from her own heart by the Master of Masters, who takes Ava, Aced, Gula, Invi, Ira, and Luxu as his apprentices. Ava eventually achieves the rank of Keyblade Master alongside her fellow apprentices.
Shortly thereafter, the Master gives a copy of the Book of Prophecies to Ava and grants her leadership over the Vulpes Union as its Foreteller. As Ava and the other Foretellers read their copies of the Book of Prophecies, they are shocked by the final entry, which details an event known as the Keyblade War, during which light would expire and the world would reach its end.
Sometime after Luxu mysteriously disappeared to fulfill his role assigned to him by the Master, the Master meets with Ava alone in the Foretellers' Chamber. He instructs her to avoid the imminent battles in favor of gathering Keyblade wielders, regardless of their Unions, to be part of a separate faction called the Dandelions, who would venture to another world in order to ensure the survival of light. The Master provides Ava with a list of five Keyblade wielders she must gather as Dandelions in order to succeed the Foretellers as Union leaders following the Keyblade War, with only one of them meant to receive a copy of the Book of Prophecies.
Ava and her fellow Foretellers are soon introduced the Master's latest creation, the Chirithy. While Ava gushes over Chirithy's cuteness, the Master explains that the Spirit Chirithy are meant to aid Keyblade wielders in their endeavors, but he warns that should a wielder fall to darkness, so will their Chirithy, causing them to transform into a Nightmare. Aced suggests that they destroy any Nightmare Chirithy they come across, but Ava refutes the idea. Ava and Gula then tease Aced for his frightening demeanor, much to Aced's embarrassment.
Without warning, the Master disappears from the world, and although the Foretellers actively seek him out, they are unable to locate him. Upholding the Master's teachings, the Foretellers begin recruiting Keyblade wielders to each of their Unions, utilizing the powers of their copies of the Book of Prophecies in the form of Medals to aid their wielders in collecting Lux in order to maintain the balance of power.
Kingdom Hearts χ
Over time, the Foretellers notice Keyblade wielders utilizing bangles that provides them the power to collect dark energy, though they decide that using the bangles was acceptable for their Union members. Subsequently, Ira summons the Foretellers for a meeting in the Foretellers' Chamber, declaring that there is a traitor among them after discovering a Nightmare Chirithy snooping around their home. Ava proposes that the Nightmare could belong to a wielder in one of their Unions, though Ira reasons that the bangles are the Nightmare's doing and the traitor has to be one of the Foretellers since only one of them could have obtained the bangles. Aced condemns Ira for spreading doubt amongst them and adjures the meeting, prompting Ava to depart from the Foretellers' Chamber.
One night, Player is shown a dream by Chirithy, in which Ava and the other Foretellers meet with the Master in the Foretellers' Chamber, though Nightmare Chirithy quickly puts a stop to this dream.
A few days later, Aced invites Ava and Gula to meet with him in a warehouse, where he voices his frustration against Ira's suspicions. Ava tries to defend Ira's actions, but this only aggravates Aced further as he believes Ira should trust them. At Gula's behest, Aced proposes to form an alliance between their Unions, prompting Ava to remind him that alliances are forbidden. While Gula accepts Aced's offers, Ava declines, opting to follow the Master's teachings. When Invi arrives to the warehouse, a disheartened Ava watches as Aced and Invi argue and accuse the other being tainted by darkness. With this, Ava parts ways with her fellow Foretellers.
Sometime later, Ava sits alone in the Fountain Square and is soon joined by a wielder named Ephemer, who notices her depressed demeanor. Ava confides in Ephemer about her doubts about the Master's teachings regarding the competition between the Unions, much to his surprise. Ava approves of Ephemer's desire to solve the mysteries of the world, as she believes that people should question things and think for themselves. Ephemer jokingly tries to get Ava to talk about the Book of Prophecies, but she denies him. Hearing that Ephemer had befriended a Keyblade wielder from a different Union, Ava is pleased to learn that wielders from other Unions could work together. After Ephemer leaves, Ava is relieved to know the world following the Keyblade War would be entrusted to young Keyblade wielders who share Ephemer's perspective.
Later that night, Ava encounters Ephemer outside the entrance to the Foretellers' Chamber and guides him to the outskirts of Daybreak Town for a private conversation. Ava informs Ephemer of the impending Keyblade War, and selects him to act as one of the new Union leaders in the Foretellers' stead after the war. She then provides a book of rules that must be followed once the new Union leaders take charge to prevent future destruction. Moreover, Ava tells Ephemer that the Union leaders must erase the memories of the Keyblade War from their fellow Dandelions and avoid any possible connections between the two worlds, thus the truth about the war must be kept a secret among the new Union leaders. Despite Ephemer's misgivings about erasing everyone's memories, Ava sends Ephemer to travel to another realm and instructs him to meet the other Union leaders in the Keyblade Graveyard following the war.
A few days later, Ava finds Player and Chirithy, who are trying to locate Ephemer, at the entrance to the Foretellers' Chamber. Ava refuses to divulge any information regarding Ephemer and attacks to test the latter's strength. After a quick battle, Ava states that she sees a lot of potential in Player, but notes the sadness in their heart and warns they will fall to darkness if the darkness is not dispelled. Ava allows Player and Chirithy to leave, realizing that the Player is the one who Ephemer had mentioned before.
After Player and Chirithy returned home to rest, Ava appears in Player's room to ask if Chirithy had been showing Player dreams about Ephemer. When Chirithy denies this, Ava deduces that Ephemer is getting close to the truth, having fallen into an unchained state and finding himself in a different realm, and he is trying to reach out to Player. If Player is connected to Ephemer, Ava realizes that Player is getting closer to that realm, though whether Player goes or not is determined by their heart. Ava tells Chirithy to protect Player from Nightmares before taking her leave.
A few months later, Ava receives word from her Chirithy that Aced and Invi have been sighted battling each other throughout Daybreak Town. Hurrying to the scene, Gula, who was watching the duel nearby, calls Ava to their location. Invi declares that Aced is the traitor, and although Ava is reluctant to believe this, she and Gula stand with Invi against Aced. With strong belief in his own goals, Aced plunges into battle against his former comrades, from which he barely emerges alive.
Ava heals Player, thanking them and Skuld for showing her the strength of their hearts. Ava proceeds to tell them the truth of the Keyblade War, Ephemer's involvement, and invites Player and Skuld to join as well. Although Skuld immediately agrees, Player is concerned for those not chosen to become Dandelions. Ava respects their decision, but asks that Player and Skuld keep everything she has told them a secret due to the sensitivity that comes with the topic of the future.
Soon, Ava discovers Aced and Gula fighting at a warehouse and jumps in to stop Aced from finishing off Gula. As Aced withdraws, Ava tends to Gula's injuries and goes into hiding to protect Gula from Ira. However, they are discovered by Invi, who reports them to Ira, leading Ira to confront Ava a few days later. Frightened by the possible consequences, Ava resolves to protect Gula from Ira, who calmly accepts this and leaves. When she returns to Gula's side, Gula informs her of the contents of the Lost Page, which predicts an inevitable betrayal and "the one who bears the sigil", whom he had assumed was Aced. Gula commends the distraught Ava for her scrupulous behavior, and voices regret that he performed guileful deeds in following the Master's instructions. He then explains that he intends to summon Kingdom Hearts to decipher the Lost Page by forcing the Master to return, but Ava declines to assist him as summoning Kingdom Hearts had been forbidden. Respecting her decision, Gula goes off on his own.
Ava later chides Invi for worsening the conflict between the Foretellers by divulging Gula's whereabouts to Ira, and defends her own actions in assembling the Dandelions by explaining that she is merely following the Master's instructions. Invi apologizes for misinterpreting Ava's actions, and Ava discloses Gula's plan to summon Kingdom Hearts by collecting Lux. They realize that Aced and Ira are also gathering Lux out of fear that Gula is vying for power, and decide to do the same in order to maintain the balance and delay the war, despite worrying that it could hasten the war. Ava gathers her Dandelions at Fountain Square and instructs them to continue their preparations to avoid the war by going to the world outside, and entrusts them with the hopes for the future. In a last attempt to obtain outside intercession on the brewing conflict, she begins looking for Luxu, hoping he can lead her to the Master.
Eventually, Ava tracks down Luxu at the outskirts of Daybreak Town and interrogates him. Luxu explains that he was assigned to survive the Keyblade War and observe the events to come, and that her attempts to prevent the war by locating the Master are futile. He tells her that the Lost Page is an additional part of the prophecy that was kept secret from the Foretellers, making Ava wonder if all the conflict had simply been according to the Master's plans. She accuses Luxu of being the traitor, who then reveals the truth of the traitor. Luxu wonders if the Master has chosen to take an interest in the fate of his disciples over the fate of the world, but Ava refuses to accept that the Master's motives could be suspect, and accuses Luxu of exploiting the Master's will. She attacks Luxu, signalling the beginning of the Keyblade War as Daybreak Town's bell begins to toll. Shortly afterwards, she arrives to the Badlands with the members of her Union.
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Kingdom Hearts III
Ava is the only foreteller who does not meet with Luxu in the Keyblade Graveyard after Xehanort's defeat. Luxu is not surprised by this, since he had told her what his role given by the Master was and since she had successfully carried out her own mission.
Ava is a girl who hides her face under a white fox mask that has a blue trim. Her pink, hooded cloak is decorated with light green tassels and covers a white robe, light purple shirt, and light purple sash.
Ava is a kindhearted individual whose youth enables her to befriend the members of not only her Union, but others as well. Despite her young age, she is prudent and diligent, fulfilling the role the Master of Masters assigned to the letter, despite her own personal misgivings in regards to some of his teachings; when questioned on this, however, she is quick to assert that the Master is beyond reproach despite all evidence to the contrary. She is very forthcoming in most matters, able to tell Ephemer about her doubts as a Foreteller, and able to personally invite others to become members of the Dandelions. She also displays a more childish side, as she is openly infatuated by the Chirithy the Master presents to the Foretellers.
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Ava wields a Keyblade that is unique among the Foretellers' Keyblades in form, lacking a large, engraved dark portion on its shaft. It features many gradients of pastel tones. It has a long, gold handle. The guard has long, cloud or wave-shaped portions shifting from yellow to blue on the top and separate blue pieces by the pommel. The base features a gold fox with teal eyes set atop an intricate gold and pink etching. A few cloud-like golden parts are above it to either side. The shaft is twisted and pink, then yellow, then blue. The blue bursts into separate clouds which form the teeth. Set in the center of the teeth, perpendicular to the shaft, is a pink symbol resembling Terra's Mark outlined in gold. The Keychain matches the blue parts of the blade, while the token is yellow and pink, inset with the Gazing Eye.
Ava is adept in crafting illusions, which she also uses in her signature technique, "Foxtrot". She is also able to cast healing spells.
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