Aqua

How Aqua joined the Tourney
Aqua, alongside Terra, was one of Eraqus's pupils. Like Terra, Aqua also had a dream of becoming a Keyblade master.

One day, a suspicious man named Master Xehanort arrived and gave Eraqus a new apprentice to work with, a boy named Ventus. Terra called out to Aqua and told her that a new apprentice had just arrived. Aqua and Terra tried to converse with Ven and asked him about why he wanted to train to become a Keyblade master. The questions troubled Ven to the point that he couldn't take the pressure. He fainted and shocked Aqua and Terra.

Eraqus told Aqua and Terra that the reason Ven fainted was because he had lost his memories. Aqua decided to look after Ven, in case he woke up. Many days passed and, despite Ven being unable to awaken, Aqua did not abandon him. One day, Aqua saw Ven open his eyes and regain consciousness. Overjoyed, she quickly informed a worried Terra and Master Eraqus.

Since that day, Aqua developed a very close relationship with Ventus, acting much like his older sister and becoming very protective of him. Over the years, Aqua, Terra, and Ven forged a strong bond with each other.

One night, Ven, Terra, and Aqua watch a meteor shower together and she gives them each a good luck charm, and saves one for herself.

The next day, she takes the Mark of Mastery exam along with Terra, and becomes a Keyblade Master, although Terra fails due to his inability to control his darkness. After Terra and Ventus left, Aqua was the last apprentice to be sent by Eraqus to bring Ventus back to the Land of Departure. Before she left, Eraqus wanted to ask Aqua to keep an eye on Terra, to make sure he is alright, and stays safe from the darkness in his heart. If Terra's heart would become too close to the darkness, Eraqus needed Aqua to bring Terra back immediately.

Aqua, Ven, and Terra make many new friends along the way and fight off hordes of Unversed. Aqua later ends up at Radiant Garden with Mickey Mouse and meets the young Princess of Heart, Kairi, who touched Aqua's Keyblade in fright, unintentionally performing a Bequeathing. Aqua and Mickey protect her from a group of Unversed, and in return, Kairi gives Aqua flowers, which becomes the Keyblade Destiny's Embrace. Aqua also places a protective charm on Kairi's necklace to help her in the future, believing that their meeting may not have been a coincidence.

Aqua later meets up with Terra and Ventus, but the reunion is short-lived as they team up to battle a massive Unversed. They manage to defeat it, but things take a turn for the worse. Terra and Aqua begin to argue about Master Eraqus's orders, revealing to Terra that she was sent to watch him. Hurt by this, Terra leaves, and Ventus calls Aqua awful, claiming that she has let her new status as a Keyblade master go to her head. He then leaves to find Terra, as Aqua stays to contemplate.

After meeting Merlin at his house, Aqua goes to the town square and encounters the enigmatic Vanitas, who taunts her by inquiring about Ventus and if he has gotten stronger. When Aqua asks what he means, Vanitas attacks, and the pair fight a vicious battle. Aqua emerges victorious, but Vanitas simply leaves via Corridor of Darkness, making an ambiguous comment about her being his backup plan. Aqua then resolves to stop Vanitas to protect Ventus and Terra. Ventus then appears, asking to go with Aqua. At first she is harsh with him and he appears discouraged. She softens and tells him she doesn't want to put him 'in harm's way', and departs not long after.

While in Neverland, Aqua encounters Peter Pan and the Lost Boys, joining them on their treasure hunt. They later find their treasure chest, filled with wooden swords and Ventus's wooden Keyblade. Peter Pan tells Aqua that Ventus left the toy there as he no longer needed it. Aqua then senses someone nearby and goes off to investigate. She then encounters Vanitas again, this time with Ventus's cherished Wooden Keyblade. The dark enigma cruelly mocks Aqua's actions and snaps the toy weapon in two. Greatly enraged by this, Aqua battles and defeats him again, but is left exhausted by the fight and passes out. While unconscious, she reminisces about the first starry night she spent with Terra and Ventus. She soon recovers and leaves Neverland.

At one point Aqua and Terra come to Destiny Islands and meet two young boys by the name of Sora and Riku. Aqua sees the strong bond between the two friends and advises Sora to help Riku if he ever falls into darkness; though she initially intends to grant Sora the power to use the Keyblade, she decides against it upon discovering that Terra had already done it for Riku, not wishing to put the two innocent children through the ordeals she and Terra have faced.

Aqua later encounters an unconscious Mickey drifting in space and takes him to the Mysterious Tower, where she hears of Eraqus's death from Yen Sid and heads to the Keyblade Graveyard to meet up with Terra and Ven.

A short conversation with Ventus takes place there, one where he states that if he does become the X-blade, he wants the two of them to 'put an end to me.' Aqua appears horrified, but Master Xehanort makes an appearance and tells about the history of the Keyblade War. Afterwards they attack, and a great battle takes place. Xehanort holds Ven over the edge of a cliff where Aqua can see, he freezes the boy and drops him; however, she manages to catch him. After fighting Braig and then Ventus under Vanitas's influence, the X-blade is destroyed and she is flung into the Lanes Between, unconscious. Mickey finds her and Ventus drifting there and brings them both to Yen Sid's Tower, where it is revealed to her that Ventus has lost his heart. She takes Ven back to the Land of Departure and places his sleeping body in a throne. She takes Eraqus's Keyblade and transforms the world into Castle Oblivion to keep Ventus safe. Afterwards she says her goodbyes to Ven, fondly stroking his hair, and leaves. She then tracks down the possessed Terra to Radiant Garden.

Failing to bring Terra back to his senses, Aqua fights and defeats Xehanort; subsequently, Xehanort stabs himself in the chest with his own Keyblade in an attempt to lock Terra out as a horrified Aqua looks on. As Terra-Xehanort falls through a portal into the Realm of Darkness, Aqua dives in after him, but quickly realizes that she will be unable to save them both. Instead, Aqua sacrifices her armor and Keyblade to save the dark being that had once been her dear friend, sending him back into the Realm of Light while she remains behind. Now stuck in the Realm of Darkness, Aqua is attacked by several giant Heartless and decides to just allow them to destroy her, but is saved by Terra and Ventus's Keyblades. She is then reminded of the people she is connected to. With renewed trust in her friends, Aqua continues on.

As she travels she sees a large circle of light form above her, only for a powerful column of darkness to shoot out of it in front of her. Seemingly unshaken by this she presses forwards and encounters several Shadows, Neoshadows, and Darkballs. After traveling deeper into the Realm of Darkness, Aqua senses something stalking her, and comes face to face with a large Heartless that attacks her. To prevent it from attacking her she uses a Fire spell, only for it to leap over her. Getting a closer look at it, Aqua determines it is not an Unversed and takes a battle stance to fight it. After felling the Heartless, Aqua continues walking, eventually coming to a clearing and looking up. Surprised, she recognizes the Castle of Dreams surrounded by clouds of darkness.

Emerging from the darkness in Virginia, she meets one of the settlers, John Smith in the hopes of finding a way of returning home.

When highlighted
Aqua holds her keyblade like a dao.

After the announcer calls her name
Aqua casts an ice spell as the camera zooms saying "As long as you're with me, I'll always find my way back. Always."

Triple Firaga (Neutral)
Aqua launches three fireballs at her opponent.

Glacier (Side)
Aqua freezes surrounding enemies in a block of ice, before sending them flying.

Doubleflight (Up)
Aqua jumps two times to boost herself.

Seeker Mine (Down)
Aqua sets explosive magical traps next to her which zoom toward and stun any enemies that get too close.

Bubble Blaster (Hyper Smash)
Aqua fires volleys of bubbles at targets.

Ghost Drive (Final Smash)
Aqua warps around her target while placing spikes of energy from every angle until the target is surrounded, at which point the energy is released as a powerful shockwave.

Victory Animations

 * 1) Aqua swipes her Keyblade two times and says "Most impatient."
 * 2) Aqua does a carthweel then swings her Keyblade down saying "I've won this fight."
 * 3) Aqua casts fire magig from her Keyblade and says "For my aspirations!"

On-Screen Appearance
Aqua comes out of a magic portal and says "I sense a world crisis here."

Trivia
{{Kingdom Hearts universe}{
 * Aqua's rival is one of the settler's into Virginia and Pocahontas's first love interest, John Smith.
 * Aqua shares her Japanese voice actress with Green Proton and Jan Brady.
 * Aqua shares her Arabic voice actress with Nora Fries.
 * Aqua shares her Mandarin Chinese voice actress with Junior Asparagus.