Celestial Spirit Magic is a type of Magic in which the user summons Celestial Spirits by opening their gates through the use of Celestial Spirit Gate Keys. These Keys are separated into two classes: the more common Silver Keys and the rarer Gold Keys. Keys for Celestial Spirits are counted in Units (collectively without regard of Gold or Silver), and a Celestial Spirit Mage is noted by how many Units they have obtained. When a Celestial Spirit Mage receives a Key and opens its Celestial Gate for the first time, they have to set up a contract with the respective Spirit. This contract consists of asking the Spirit which days it can be summoned by its contractor. This simple agreement leads to a dedicated and serious bond between the Spirit and summoner. However, under certain circumstances, i.e. during battle, and a Spirit is summoned for the first time, the making of a contract may be suspended on a later date. Contracts can be broken if the Mage gets arrested, releases the Spirit by themselves, or dies. When a Celestial Spirit Mage summons a Spirit, it appears directly next to them, as that's where the gates to the Spirit world had been opened. It's impossible to summon spirits elsewhere. When the Gates are closed, it is required from both the summoner and the Spirit to agree upon the gate's closure. However, Spirits can also be "forced closed" in battle, which means they can be forced back into the Celestial World by the summoner's will, though not every Celestial Spirit Mage is capable of doing such.
Aquarius (アクエリアス Akueriasu), "The Water Bearer" (宝瓶宮 Hōheikyū) - Aquarius resembles a royal blue mermaid. She has a long, blue fish-tail, light blue hair that reaches up to her waist, and a large bust. She has blue eyes that seem to have no pupils. Aquarius wears a revealing dark blue bikini top and on each arm, she has a golden armlet and bracelet. Aquarius also has a headband, three piercings on her tail, and a golden belt at her waist and light blue crystal earrings. A dark blue tattoo resembling the Aquarius zodiac symbol rests right under her collarbone. Aquarius also wields an urn that acts as the basis of the Water Magic she employs in battle. This design reflects her respective zodiac sign; "Aquarius" is often depicted as a merman or mermaid carrying a vessel from which a pouring stream of water emerges.
Water Magic (水系各種魔法 Mizu Kei Kakushu Mahō) - Aquarius uses Water Magic as her primary source of combat. Using her Magic, she is able to control water through her urn to hit opponents with great force, usually done via giant waves of water or through variations of beam attacks.
Bubble Shot: A stream of big bubbles are released from Aquarius's urn, which hit the opponent with great force, multiple times
Water Pillar: Aquarius swings her urn towards the target creating a huge pillar of water that strikes the target from below
Virgo (バルゴ Barugo), "The Maiden" (処女宮 Shojokyū) - Virgo takes the form of a maid with shackles around her wrists, short, pink hair, and blue eyes. She wears a typical maid outfit, consisting of a black under coat and a white, frilled-trim apron. The form she takes is dependent of her contract holder's idea of beauty. Now that she is under Camus' care, she has a more typical appearance of a beauty with a petite body. Virgo has a tendency to ask whether she should be punished after she has done something, regardless of if it was good or bad, indicating that she's a masochist. This is ironic, since she is the Maiden. She is very stiff and haste in her movements and is very loyal and obedient to her owner, so much so that she changes her appearance for them. She enjoys calling Camus "Master."
Earth Magic (土系各種魔法 Tsuchi Kei Kakushu Mahō) - Virgo exhibits great prowess in Earth Magic, with her form of Earth Magic revolving around the creation of holes. Using her Magic, Virgo is able to create holes to immobilize opponents and use as entryways to travel underground with her Diver.
Diver (ダイバー Daibā): Virgo can travel underground as simple as swimming in water. With this spell, Virgo can create holes to either trap someone or utilize as an escape method.
Spica Lock: This attack can trap an opponent within boulders, thus restrain them.
Spica Hole (スピカホール Supika Hōru): This spell is used to trap and incapacitate an enemy. First, Virgo grabs and throws the enemy into the ground and with the momentum from the throw, a circular hole is created in the ground, resulting in the opponent being trapped in a pit.
Transformation Magic (変身魔法 Henshin Mahō) - She also has shown the ability to change her appearance to suit her master's tastes, as seen while with her previous owner, she had the appearance of a large gorilla-like woman with formidable brute strength. It is currently unknown if her strength scales with her size or if she has the same physical prowess in her current form, though it should be noted that there have been instances of her attacking opponents with great strength while in her petite form.
Chain Magic (連鎖魔法 Rensa Mahō) - By using this form of Magic, Virgo is able to manipulate the chains around her wrist. She has been shown to be able to extend the length of the chains and to move them around as she wishes. The chains can be used in an offensive way by elongating them and using them as a whip
Aries (アリエス Ariesu), "The White Lamb" (白羊宮 Hakuyōkyū) - Aries is a female spirit who resembles a young woman with pink hair, brown eyes and a pair of twisted horns on her head. She wears clothes that have a white and fluffy wool-like getup. Aries is very shy and polite. She frequently apologizes, regardless of whether or not she is truly at fault. Still, she is very sweet and able to appreciate how kind of an owner Camus is. She is quite easily frightened. Despite this, she is very obedient and willing to fight for her owner.
Wool Magic (羊毛の魔法 Yōmō no Mahō) - Aries' Magic allows her to create and manipulate pink wool that covers opponents by distracting them, sending them into a relaxed and comfortable state. Aries is able to create enough wool to entangle many opponents at once, as well as use it underwater.
Wool Bomb (ウ－ルボム Ūru Bomu): Aries conjures a massive amount of magical wool around her opponents, in which she can ambush them in any given direction and lull them into a relaxed state, bringing the battle to her advantage.
Wool Shot (ウ－ルショット Ūru Shotto): Aries blasts little bursts of pink wool at her foes which attach to them, and, like her Wool Bomb attack, feels warm and relaxing to the recipient
Wool Wall: Aries conjures a thick cloud of pink wool which protects her from attacks, and like her other wool attack, feels very soft.
Wool Cushion: Aries conjures a massive woolen cushion that spirals from the ground. It acts as an airbag which allows those falling from high ground to remain unharmed.
100% Fluffy-Fluffy Wool (モコモコウール 100% (パーセント) Mokomoko Ūru 100% (Pāsento)): Aries releases a thick flurry of wool towards the opponents, which blinds and obscures their vision and causes them to wheeze.
Leo (レオ Reo), "The Lion" (獅子宮 Shishikyū) - A young man of average height, distinguished by his delicate facial features and his orange hair. His hair is somewhat long with spikes jutting in every direction, with a pair framing his face; due to another pair of strands sitting on top of his head, being vaguely reminiscent of animal ears, the rest of his hair mirrors a lion’s mane. It's also worth noting that his teeth are sporadically portrayed as being sharp, in reference to his lion theme. Leo's hazel eyes are almost always covered by a pair of azure-tinted sunglasses with a thin frame. His outfit consists of an elegant dark suit, with the jacket left unbuttoned and the loose pants held up by a light colored belt, over a lighter shirt with a red tie around the neck, plus dark shoes.
Regulus (王の光, レグルス, Regurusu) - A type of Caster Magic related to his Celestial Spirit powers which allows him to produce the element of light from his body, Regulus is mainly used to boost Leo's melee performance, empowering his physical attacks with wakes of destructive light, which are produced from his unarmed blows in a fashion similar to a lion clawing at its prey. Light can also be employed in other ways, with Leo being capable of emitting it in vast amounts, enough to cover a wide area, and shape it into various forms.
Lion Brilliance (獅子光耀 Shishikōyō): One of his most powerful spells, Lion Brilliance is initiated by Leo taking on his casting stance. This lets out a large amount of light from his body, covering a wide radius. This bright light can be used to momentarily blind opponents, forcing them to lower their guard, while seemingly leaving allies unaffected, allowing them to maneuver freely while the spell is active. An offensive, seemingly more powerful variation of this move exists, in which the light produced by Leo's body is capable of striking opponents down.
Regulus Impact (獅子王の輝き Regurusu Inpakuto): Arguably Leo's most powerful melee move seen so far, he performs this spell by gathering light on his open right palm and then clenching his fist to punch the target. When this punch connects, a large lion's face materializes from light and strikes the target, blasting it away with great force.
Regulus Gatling Impact: Leo repeatedly punches at his opponent(s), sending them flying from the impact whilst releasing brilliant beams of light.
