Aquarius

Aquarius, "The Water Bearer" (アクエリアス Akueriasu) is a Celestial Spirit that is one of the 12 Golden Zodiac Keys. Her key is currently owned by Lucy Heartfilia.

Appearance
Aquarius is a Celestial Spirit with the appearance of a royal blue mermaid. She has a long blue fish-tail, large breasts, and dons a revealing bikini top. She has two gold armlets and wears a jewel circlet. She wields an urn which is the basis of her powers. She was designed to have her appearance as her respective zodiac sign whereby "Aquarius" is depicted as a merman or mermaid carrying a vessel from which is pouring a stream of water, as reflected by the urn and Water Magic which Aquarius employs in the Fairy Tail series.

Personality
Aquarius is a very moody and ill-tempered Celestial Spirit who often threatens to kill her owner, Lucy. One of the most important distinctions between Aquarius and the other Celestial Spirits is that while the other spirits serve Lucy obediently, Aquarius is irritated by her. Whenever she is summoned, she will either attack the opponent, Lucy, or both of them, depending on her mood. Although the risks of summoning Aquarius is high, Lucy still summons her on various situations as she is her most powerful Celestial Spirit. Despite this, Aquarius does care for Lucy's well-being. She is very kind and loving towards her boyfriend, Scorpio, to which she shows a completely different side of herself. She also goes as far as to threaten Lucy to keep quiet about her moodiness in front of Scorpio unless she wants to be a "drowned corpse". Whenever Lucy is within her presence, Aquarius has a tendency to make remarks about having a boyfriend, since Lucy doesn't have one. Despite all this, Aquarius has helped Lucy out several times and is shown to be more lenient with her attitude towards Lucy as time advances.

History
Aquarius' previous master had been Lucy's mother, Layla Heartfilia. When Layla retired from her work as a Mage because of her health problems, she entrusted Aquarius' Key to another Mage with instructions to present it to Lucy if she chose to be a Celestial Spirit Mage.

Macao arc
As Natsu Dragneel fights Bora, Lucy summons Aquarius to haul Bora's ship, which is full of kidnapped girls about to be sold into slavery, towards the harbor. Happy shows a friendly interest in Aquarius as she looks like a fish but she doesn't respond about that compliment. After doing her job (and purposely washing Lucy ashore as well), she states her desire to not be bothered for a week as her boyfriend is taking her on a vacation. Before she leaves, she informs Lucy that she has a boyfriend whereas Lucy does not.

Galuna Island arc
Aquarius is called forth once more when Lucy battles Sherry, to deal with Sherry's Doll Play Magic. Sherry notes that Aquarius is a powerful Spirit so she gains control of Aquarius. However, Aquarius attacks Sherry along with Lucy because she does not like being controlled. Before leaving, Aquarius berates Lucy's personality, claiming that it is the reason the latter hasn't and will never get a boyfriend like she has.

Phantom Lord arc
It is mentioned by Lucy that Aquarius gave her a very painful punishment (spanking) for losing her keys after she was kidnapped by the members of Element 4.

Loke arc
Aquarius is summoned along with all of the rest of Lucy's spirits when they are confronted by the Celestial Spirit King.

Tower of Heaven arc
Aquarius is summoned again when Juvia Lockser is controlled by Vidaldus Taka. Juvia liquefies herself and Lucy takes advantage of the situation to summon the Spirit through Juvia. Aquarius attacks everyone as Juvia and Lucy join hands to use Unison Raid. After defeating Vidaldus with both attacks, Aquarius mouths off at Lucy, saying that Lucy should not summon her in such a strange place again, or Aquarius will kill her. She even comments if Lucy will ever summon her from a toilet bowl next time. She leaves again, saying not to summon her for two weeks and tells Lucy to get a boyfriend as usual.

Oración Seis arc
Lucy summons Aquarius in her battle against Angel, since the battle is taking place at a river. Desperate to defeat Angel, Lucy tells Aquarius that the Spirit is free to do anything, including attacking Lucy as well, as long as Angel is defeated. Aquarius agrees, but is quickly removed from the battle when Angel summons Scorpio, who is revealed to be Aquarius' boyfriend--a fact that Angel was aware of, but Lucy was not. Aquarius threatens Lucy not to say a word about her usual ill-tempered behavior to her boyfriend, or Lucy shall suffer the consequences. The two Celestial Spirits then go off on a date with Angel's permission, much to Lucy's chagrin.

Edolas arc
After Hughes dumps both Natsu and Lucy into a pond as they rode on the Hell Coaster, Lucy summons Aquarius to fight Hughes. Aquarius tries to attack him, but then realizes that she is unable to control the water, as it is within Hughes' power. He sends Aquarius' attack back at her and she screams for Lucy to take cover of the attack.

Tenrou Island arc
While fighting Freed Justine and Bickslow, Cana Alberona uses The Prayer's Fountain card, which gives Lucy an opportunity to summon Aquarius. She angrily wave-slashes everyone as usual. However, Aquarius doesn't pick on Lucy but chooses to bicker with Cana instead, saying that all women are her enemies and that just being 'firm and bouncy' doesn't count as 'justice'. Aquarius also deems zero points for Cana as a woman. Through this argument, Lucy takes note of how similar Cana and Aquarius are.

Key of The Starry Sky arc
Note: Events in this arc occur only in the anime and do not constitute canon material.

Grand Magic Games arc
Aquarius surprises Lucy and her friends when Virgo brings them to the Celestial Spirit World for a welcome back party. During the party, Aquarius talks to Juvia, noting that Juvia was the one who once used Unison Raid with Lucy when they fought Vidaldus. Aquarius then asks her if she has a boyfriend, causing Juvia to blush and say no to her, which Aquarius concludes that she would become like Lucy. During the entire party, Aquarius accompanies Juvia and holds hands with her during the group's departure, signaling the start of a good friendship.

On the fourth day of the Grand Magic Games, Aquarius is summoned within a giant water sphere by Lucy during the Naval Battle event, declaring the water to be her playground as she prepares to attack. However, Juvia Lockser uses a spell in the water that creates a whirlpool-like effect, surprising Aquarius as she notes that Juvia's abilities are on par with her own. Observing the happenings, Aquarius declares her intentions to leave, stating that the battle won't end well. Despite Lucy telling her she's the one she can most count on in the water, Aquarius blushes and tells Lucy that she has a date and leaves, much to her summoner's annoyance.

Later on, after Uosuke defeats Pisces by using Terrain Effect: Whirlpool Zone, Lucy takes this chance to summon Aquarius. Aquarius then uses her Water Pillar spell to send Uosuke spinning through a wall.

On July 7th, the Eclipse Gate is opened and in order to seal it and stop the inflow of Dragons, Lucy and Yukino summon all 12 zodiac spirits, with Aquarius among them. Aquarius is encased in an aura of Magic and flies with the other 11 spirits to the gate. Despite the attempts of the Dragons to get through, Aquarius and the other spirits, through their hard work, are successful in forcing the gate to close and repelling their attempted invasion.

Magic and Abilities
Water Magic (水の魔法 Mizu no Mahō): Aquarius uses Water Magic as her primary source of combat. She is a powerful Celestial Spirit; even after Loke, a powerful Celestial Spirit, became one of Lucy Heartfilia's Celestial Spirits, Lucy considers Aquarius as strong as him or possibly even above his level of strength.
 * Giant Wave Attack: An attack in which she absorbs water in her urn and hurls it with tremendous force. She can throw a yacht from a few hundred miles out at sea back to shore. (Unnamed)


 * Water Beam: Aquarius releases a powerful jet of water from her urn which can travel quite a distance and hit any specific target she aims at. (Unnamed)


 * Bubble Shot: A stream of big bubbles are released from Aquarius's urn, which hit the opponent with great force, multiple times. (Unnamed)


 * Water Pillar: Aquarius swings her urn towards the target creating a huge pillar of water that strikes the target from below. (Unnamed)

Levitation: Aquarius can float in the air.

Immortality: As a Celestial Spirit, Aquarius cannot die unless she is somehow forced to stay in the Human World.

Equipment
Urn: It is a vase-like container that features curled handles that are symmetrically attached to opposite sides of the vase. It is embellished by dark blue rings studded with blue dots occupying the narrowed neck and the bottom rim of the container, with the widened center of the urn encompassed by a decorative helix-like pattern of blue stripes that are alternatively shaded. Aquarius utilizes this urn to cast her Water Magic.

Fairies at the Beach
Lucy originally summons Aquarius to punish her teammates who are causing mischief at the beach where she is waiting for the Sorcerer Magazine staff who are supposed to do a photo shoot with her for their latest cover. However, Aquarius only laughs at Lucy and Taurus arrives in her place instead.

Fairy Academy - Yankee-kun and Yankee-chan!
Aquarius appears as the harsh swimming instructor of Fairy Academy who is able to send people flying from her pool. When called by Lucy, she unleashes a great wave of water from a giant hose that flooded the whole campus, in an attempt to get rid of the students from Courage Academy.

Fairy Tail Gekitou! Madoushi Kessen
Aquarius appears as a supporting character for Lucy in the DS Game, Fairy Tail Gekitou! Madoushi Kessen.

Fairy Tail Gekitotsu! Kardia Daiseidou
Aquarius appears as a support character for Lucy in the DS Game, Fairy Tail Gekitotsu! Kardia Daiseidou.

Trivia

 * She was originally only able to be summoned by Lucy on Wednesdays.


 * She apparently looks like Undine, The water Kingdom's Queen from one of Hiro Mashima's previous work called 'Fairy Tale'.