Sirius

Biodata

Feature	Details
Name	Sirius
Alias(es)	Miss Sirius; the first Magical Girl; the strongest active Magical Girl; incarnation of the Sirius Crystal
Species/Race	Star Crystal quasi-personality/AI; later reconstructed in an artificial Base Body 167 630
Gender	Female-presenting
Affiliation	Magical Girl Association; Zodiacal
Occupation/Role	Magical Girl idol, combatant, mentor, Association chairwoman, producer/manager of the idol group Galaxy 51 710 1173
Status	Active; previously suffered near-dissolution and was restored with incomplete data, leaving major memory loss 604 630
First Appearance	Chapter 45

Background / History

Sirius is the first Star Crystal to arrive on Earth and the first Magical Girl. When Earth faced External Invaders, she could not wait for a compatible human candidate to develop, so she incarnated directly and made a contract with herself. This gave her immediate combat power, but she stated that the contract prevented her from simply returning to her original Star Crystal state. 28 47

She fought on the front lines for twelve years, appearing across the world to destroy Monsters emerging from wormholes. Her overwhelming strength, long service, and public profile made her the highest-ranked Magical Girl in both power and popularity. 28 45 46

Sirius was initially a personality created by the Sirius Crystal to communicate with humans rather than a human being with a soul. SpiCa was the first person to teach her human knowledge; through years of fighting and living alongside others, Sirius developed emotions, independent goals, and a strong attachment to her companions. 167 346 675

On Nabu Island, Sirius hosted and trained Ceruno and Miluno. She fought the pair to test their abilities, recognized Ceruno's potential, and urged Miluno to treat surpassing her as a concrete goal. 46 53

During the battle with Fomalhaut, Sirius recognized that her own personality restricted the Sirius Crystal's full output. She successfully fused with Ceruno, lending her Crystal and power to create a Witch-level combatant. 335 339

Later, Sirius pushed her power beyond its limits against the Great Blood. By discarding her personality and crystallizing her body, she unleashed an ultimate eye-laser attack strong enough to oppose the enemy's darkness, but the process caused irreversible self-loss and left her close to dissipation. 604 628

Mi eventually transferred Sirius's remaining data into the Life Management System and created a new Base Body for her. The restoration succeeded physically, but her incomplete data left her with amnesia: she remembered herself as an idol, yet forgot her Magical Girl identity and many relationships. 629 630

After the war, Sirius continued as a public leader and Association chairwoman, apologized for institutional failures toward Negative Variants, advocated publicly against Enheria's Evolution Plan, and supported the transition toward the Magical Girl-run Zodiacal. 710 781 794 She later chose to live with the other Magical Girls on the moon while continuing to manage her Earth-based assets remotely. 953

Appearance

Sirius is known for her dazzling, idol-like appearance and an immediately recognizable golden color scheme. Even before transforming, her presence is described as unusually refined and otherworldly. 45

• Long golden hair and sparkling eyes associated with her light magic. 45
• A glittering idol outfit; her Battle Dress adds a golden cape to a midriff-baring costume. 45 427
• Conspicuous Wings of Light, which can shift into light-based jet thrusters for flight. 56
• In combat, she can bind her hair with light and adopt a sharper, more martial appearance. 581
• Her reconstructed Base Body closely resembles her former appearance, though its facial contours differ slightly. 630

Personality

Sirius is flamboyant, teasing, and highly conscious of presentation. She casually calls Miluno “Boyfriend,” jokes about romantic relationships, and treats even dangerous operations with the instincts of an idol producer planning a performance. 50 121 427

Behind that showmanship, she is observant and protective. She notices Ceruno's lack of confidence, arranges care for guests at her manor, offers work and protection to deaf-mute maids, and refuses to treat modified people or Monsters as automatically less than human. 46 53 55 253

She is also stubbornly loyal to SpiCa. Their disagreements can be intense, especially over risky operations, but Sirius's anger stems from fear of losing one of her oldest companions. 272 346

Abilities & Skills

Light Manipulation

Sirius controls the light she emits, shaping it into attacks, defenses, and movement systems. 46

• Creates flash grenades, high-energy lasers, and wide-area laser barrages. 46
• Fires an eye-based High-Energy Ray capable of melting terrain into glass and detonating incoming Black Crystal artillery. 47 560
• Forms light constructs including wolves, whips, wings, barriers, and rings of laser fire. 161 427 581
• Uses Sky Lock, arranging lasers into a boundary to contain enemies whose invisibility can erase light. 156
• Can fly at high speed using Wings of Light or light-based jet thrusters. 56
• Her lasers move at light speed, though gaps between attacks can be exploited by exceptionally fast opponents. 82

Star Crystal Physiology

As the Sirius Crystal's incarnated quasi-personality, Sirius possesses abilities unavailable to ordinary Magical Girls.

• Detects other Star Crystals and can identify their associated celestial bodies. 50 120
• Can sense concealed Crystals, including Miluno's Morning Star Crystal. 50
• Can alter an Awakener's body structure; she offered to remodel UI-31's throat so he could speak. 77
• Temporarily transforms into a Star Crystal to merge with compatible targets or infiltrate an opponent's body. 335 427
• Her Crystal's size and output make her theoretically the greatest known magical-power reserve, though she was still unable to overpower Fomalhaut alone. 334

Fusion and Possession

Sirius can share or exert her power through another Magical Girl's body.

• Fused with Ceruno after determining that Ceruno could withstand the Sirius Crystal's power. 335
• Her fusion gave Ceruno golden hair, increased physical stature, and access to two Star Crystals' combined power. 339
• Could later awaken and take control of Ceruno's body through a personality-adjustment machine. 343
• Briefly controlled Miluno's body to amplify her teleportation and combat capabilities. 348 560

Crystallization Overload

Sirius can remove the restraint imposed by her quasi-personality, converting her body toward Crystal form and releasing far greater power.

• Used crystallization to strengthen her ultimate eye-laser against the Great Blood. 604
• The process is effectively self-combustion: loss of self beyond a threshold causes a quasi-personality to dissipate. 604
• The Crystallization side effects placed her in critical condition after the battle. 628

Tactical Direction and Production

Sirius combines battlefield experience with idol-industry expertise.

• Directed a staged battle against Aldebaran's vine monsters to conceal the group's true objective while maintaining a believable public narrative. 427
• Analyzed Simulacrum Factors through light-based three-dimensional projections and presented the research findings to Miluno and Yin Wei. 247
• Trains Magical Girls in presentation, posture, dance, and public performance. 51 130
• Oversees Galaxy's idol activities and remains Ceruno and Miluno's boss. 1173

Resources

• Nabu Island — Sirius's private island, including a manor, beach, ranch, dance space, and prison facilities. 56 63 710
• Personal Magical Girl guard/maids — All maids in her mansion are Magical Girls; Zara also serves as part of her personal guard. 77
• Dogs and Golden — Sirius maintains a large group of dogs and practices dancing near them because their presence makes her feel safe. 51
• Extensive wealth — Her income supports Association operations, and her assets remained substantial even after investment in Zodiacal's reconstruction. 272 805

Relationships

• SpiCa — Sirius's oldest teacher, ally, and close friend. Sirius learned human knowledge from SpiCa, regularly clashes with her over strategy, and repeatedly risks herself to protect or rescue her. 346 272 346
• Ceruno — Protégé and idol fan. Sirius recognizes Ceruno's talent, trains her, and later entrusts her with the Sirius Crystal through fusion. 46 51 335
• Miluno — Rival, ally, and occasional vessel. Sirius challenges Miluno to grow stronger, entrusts her with sensitive information, and works alongside her in major battles. 53 75 560
• Halley — Fellow idol-industry associate and loyal companion. Halley chooses to remain on the moon wherever Sirius goes. 953
• Melissa and Zara — Members of Sirius's household staff and Magical Girl guard. Sirius employs deaf-mute maids to give them a livelihood. 55 77
• Aldebaran — Enemy Witch and strategic rival. Sirius directly confronted her, infiltrated her body in Star Crystal form, and rejected her offer of cooperation. 427 581
• Antarctic Star — Colleague whom Sirius openly supports, including advocating for better working conditions and living space. 953

Notable Quotes

“Invader, I am Sirius.” 604

“I am a Star Crystal. Did you think you could hide another crystal on you from me?” 50

Trivia

• Sirius is both the strongest Magical Girl and one of the world's most successful idols, with experience in records, variety shows, and films. 51
• Her battles are commonly livestreamed because of her immense popularity. 56
• She dislikes combat damage that dirties or pollutes her beach, even when facing dangerous enemies. 46 77
• After reconstruction, Sirius must periodically replenish herself with darkness or magical power to remain active. 888