Sirius

Biodata

Feature	Value
Name	Sirius Black (小天狼星)
Species/Race	Wizard
Gender	Male
Affiliation	Black family; Gryffindor House; the Marauders
Occupation/Role	Hogwarts student; eldest son of the Black family
First Appearance	Chapter 1
Birth Date	November 3, 1959 1
Residence	Originally 12 Grimmauld Place; subsequently lives with the Potter family in Godric’s Hollow. 1 594 598
Family Status	Not yet formally disowned at the time of Regulus’s handover to the Potters; Orion and Regulus subsequently agree that his name should be removed from the family tree for protection. 598 604

Power Progression

Period	Advancement	Details
Infancy	Early magical awakening	Manifested magic at ten months by drawing a silver bell toward himself, marking him as an unusually early magical prodigy. 1
Childhood	Unstable emotional magic	Displayed abundant but poorly controlled magic, including an accidental transfiguration of tableware into earthworms when excitement disrupted his concentration. 3
Third year	Combat foundations	Following his loss to Regulus, trained under former Auror Gerald Hawk in movement, spell chains, timing, and practical dueling fundamentals. 147 153 154
Third year	Morphing Intuition	Professor McGonagall identifies his innate Transfiguration talent, allowing him to intuitively envision and produce a desired form. 229
Third year	Advanced Transfiguration	Develops reliable animal transformation and reversal, earning Regulus's approval and McGonagall's continued guidance. 266 267
Third year	Apparition	Learns basic Apparition and successfully demonstrates it to Regulus before returning to Hogwarts. 356
Third year	Human Transfiguration	Transfigures the skin of his forearm into Hebridean Black Dragon scales, achieving an advanced localized physical transformation. 432 433
Third year	Elemental Transformation	Transforms a cork stopper successively into fire, water, and wind, demonstrating that his Morphing Intuition extends to formless elements. 433 434
Summer after the Rowle conflict	Continued Animagus practice	Reports in letters to Alphard that his Animagus training is progressing well; no completed transformation or animal form is confirmed. 592
Summer after the Rowle conflict	Combined concealment magic	Uses a Vanishing Spell, Disillusionment Charm, and scent-blocking spell while following a suspected Dark Wizard. His concealment remains imperfect and breaks down as his emotional magic leaks outward. 594
Summer after the Rowle conflict	Silent, wandless Transfiguration	Performs precise Transfiguration while restrained and surrounded by oppressive magical power, freeing his wrists and ankles while suppressing the sounds of his escape. 595
Summer after the Rowle conflict	Magically reinforced dragon scales	Advances beyond scales possessing only appearance and physical hardness: his transformed scales now contain magical power and help force his restraints apart. 595

Background / History

Sirius was born to Walburga and Orion Black as the Black family’s eldest son. Named after the brightest star in the night sky, he manifested magic at ten months old by pulling a silver bell toward himself. His early magic was powerful but unstable, contrasting with Regulus’s unusually precise control. 1 3

As a child, Sirius idolized Voldemort without understanding his intentions, but he increasingly rejected the Black family’s pure-blood ideology. He openly objected to the idea that love and personal choice should be subordinate to blood status, creating a lasting rift with Walburga and, eventually, Regulus. 4 5 7

His decisive break with family tradition came when he was sorted into Gryffindor—the first Black in five centuries not to enter Slytherin. Walburga reacted by fainting, while Sirius declared that the Black legacy was a “cage” and refused to become its heir. 9

At Hogwarts, Sirius embraced Muggle clothing, Quidditch, pranks, and his friendship with James Potter, Remus Lupin, and Peter Pettigrew. He viewed the Potters as a freer, more accepting family than his own. 10 11

From his first Hogwarts year onward, Sirius corresponded with his disowned maternal uncle, Alphard Black. His letters increasingly discussed Regulus, recording his confusion over his brother’s Slytherin affiliation, concern about his associates, and eventual recognition of the difficult responsibilities Regulus had assumed. 588

Orion later arranged for Sirius to spar against Regulus, exposing the large gap between their magical preparation. The defeat forced Sirius to reconsider his casual approach to magic; Orion subsequently hired former Auror Gerald Hawk to train him in combat fundamentals. 147 153 154

Watching Regulus duel Orion further exposed Sirius to the difference between ordinary school spellcasting and advanced practical combat. His astonishment turned to concern as Orion’s unnatural darkness concealed attacks and placed Regulus under sustained pressure. 149

Sirius discovered a natural aptitude for Transfiguration, which Professor McGonagall identified as Morphing Intuition. This gave him a direction for serious magical growth beyond classroom spells and pranks. 229

Over time, he began reconsidering his relationship with the Black family. Rather than reacting with anger or fleeing outright, Sirius returned home voluntarily, attended family obligations, and tried to understand the forces shaping Regulus’s choices. He came to recognize that his rebellion had left many family burdens on his younger brother. 273 294 296

At the Lestrange family Christmas banquet, Sirius acted on Regulus’s request and publicly defeated Rabastan Lestrange, demonstrating both his willingness to support his brother and his capacity to uphold the Black family when necessary. 302 309

After Pollux Black’s funeral, Sirius became increasingly troubled by Regulus’s association with Lucius Malfoy, Voldemort, and the pure-blood faction. He concluded that moral opposition alone could not change his brother’s circumstances and resolved to seek the power necessary to help him. 387 389 390

Before a new school term, Regulus visited Sirius and the Potters on Platform Nine and Three-Quarters. He thanked Charlus and Euphemia for caring for Sirius and privately instructed his brother about behavior and self-care while staying with them, provoking a mixture of annoyance and affection. 522

When Regulus activated a Family Vengeance Contract against the Rowle family, Sirius immediately wanted to return and support him. Charlus Potter persuaded him that remaining hidden was necessary for Regulus’s safety, forcing Sirius to confront his inability to act directly. 538

During Regulus’s confrontation with the Rowle family on Stanmore Moor, Sirius’s magical signature was detected from a distant hill, indicating that he remained connected to the crisis despite being unable to openly intervene. 541

After the Rowle conflict ended, Sirius spent the summer with the Potters in Godric’s Hollow, enjoying his freedom through energetic and reckless broom flights. When Regulus visited in a hooded black cloak, Sirius mistook him for a possible Death Eater and followed him into an isolated wasteland without seeking assistance. Regulus detected his pursuit, encouraged the misunderstanding with ominous-looking magic, evaded Sirius’s Disarming Charm, and knocked him unconscious with a precise physical strike. 593 594

Regulus then staged an abduction scenario inside a transfigured underground chamber. Sirius initially invoked the Black family’s name and Regulus’s reputation to intimidate his apparent captor, but changed tactics when the threats failed. He escaped his restraints through magically reinforced dragon scales and silent, wandless Transfiguration, retrieved his wand, and attempted a close-range ambush before discovering his captor’s identity. Regulus acknowledged his improved performance with “Not bad.” 595

After their confrontation, the brothers discussed Andromeda’s life in France and the birth of her daughter, Nymphadora. Sirius became anxious when Regulus mentioned Alphard’s visit, fearing that his uncle had disclosed the contents of their correspondence. Charlus then invited Regulus into the Potter home. 597

Regulus formally entrusted Sirius’s care to Charlus and Euphemia and supplied a Gringotts key containing his own money for Sirius’s daily expenses. The arrangement was explicitly personal rather than an act of the Black family, anticipating Sirius’s likely disownment while ensuring that his younger brother continued to provide support. 598

Following the visit, Orion decided that Sirius’s name should be removed from the family tree. His association with Dumbledore’s side could otherwise make him an accessible target for enemies seeking leverage against the Blacks. Regulus agreed to inform Walburga; the removal itself is not shown in this discussion. 604

Appearance

At thirteen, Sirius was tall enough to be developing the frame of a young man. He has gray eyes and favors a deliberately nontraditional style that contrasts with Black family expectations. 1 11

By fourteen, little childish softness remained in his face. His black hair is often wind-tousled, while his distinctive Black family features and gray eyes make his ancestry readily recognizable. 516

• Long hair by the end of his first Hogwarts year. 10
• Often wears faded Muggle jeans and plain dark shirts rather than formal pure-blood clothing. 10 11
• Wears his Gryffindor robes loosely; their trim was altered from silver to red and gold, with lion embroidery on the cuffs. 11
• Even when his uniform is properly arranged, he gives it a careless, unruly appearance; by fourteen, he commonly leaves his robe open and tie loosened. 433 516
• At formal Black family events, wears black dress robes with dark-patterned cuffs, though he is visibly uncomfortable in them. 303
• Has faint scars and training calluses on his hands and forearms after sustained dueling practice. 350 351
• His forearm can temporarily take on the dark, overlapping scale pattern of a Hebridean Black Dragon through Human Transfiguration. 433
• During his later escape from Regulus’s staged captivity, extends the dragon-scale transformation across the back of his hand, wrist, and half his forearm. 595
• Regulus reports that he has grown taller and is eating well while living with the Potters. 604

Personality

Sirius is emotionally intense, rebellious, and direct. He rejects hypocrisy, pure-blood supremacy, and cruelty toward people he considers weaker or unfairly treated. His sense of justice is genuine, though his impulsiveness and tendency to act before thinking can make his judgments unreliable. 5 266

His conduct does not always match his ideals. Alongside James, he participates in bullying Severus Snape and sometimes treats the conflict as entertainment, revealing that he can confuse personal dislike, group loyalty, and justice. 41 256 420

He initially treats magic as a means for fun, pranks, friendship, and adventure rather than disciplined self-improvement. Being outmatched by Regulus makes him confront his lack of direction, eventually motivating him to consider what magic, strength, and power mean to him personally. 147 153 270

Despite his hostility toward the Black family, Sirius remains deeply attached to Regulus. He watches news about his brother, seeks his approval in Transfiguration, and gradually recognizes the pressure Regulus carries as the family heir. 152 266 273 390

His growing maturity is marked by emotional restraint. He begins observing the Black family’s dynamics without immediately reacting, returns home to understand rather than simply resist, and accepts that he may remain a Black even if he chooses not to live under the family’s control. 294 296 351

Sirius’s desire to protect Regulus remains impulsive, but he is increasingly capable of accepting restraint when direct action would endanger his brother. During the Rowle crisis, he ultimately accepts Charlus Potter’s insistence that hiding is the safer course. 538

Sirius’s approach to magic is intuitive rather than analytical. He does not naturally break spells into principles or parameters; instead, a clear mental image or instinct can directly guide his magic into the desired form. 229 436

His later conduct in Godric’s Hollow shows that improved magical ability has not eliminated his overconfidence. He assumes that a hooded stranger must be a Dark Wizard, follows him without backup, and imagines James’s excitement and Charlus’s approval before considering what to do if the opponent proves stronger. His emotions are sufficiently obvious that Regulus can infer his intentions from his fluctuating magical power. 594

Under apparent captivity, however, Sirius demonstrates adaptability and resourcefulness. After unsuccessful threats, he assesses his restraints, conceals his escape work behind continued shouting, and carries out a deliberate sequence of transformations before attempting to recover his wand. 595

His pride frequently masks affection and vulnerability. He warns Regulus against provoking another attack because he fears seriously injuring him, and he becomes embarrassed when Charlus appears during their private exchange. At the Potter home, he accepts Euphemia’s affectionate attention despite protesting and briefly softens in response to Regulus’s practical concern. 597 598

Abilities & Skills

Transfiguration

Sirius possesses an innate talent called Morphing Intuition: an instinctive ability to perceive the form an object should take and transform it accordingly. 229

• Transfigured a stone into a cup, animated the cup, and then turned it into a pigeon. 229
• Can transform objects into animals and reverse the transformations. 267
• Received Advanced Transfiguration: The Limits of Form from Professor McGonagall. 229
• Trains persistently and seeks Regulus’s acknowledgment of his progress. 266 267
• Intends to pursue advanced Transfiguration, including Animagus transformation. 351
• Initially performs localized Human Transfiguration by reshaping the skin of his forearm into Hebridean Black Dragon scales. At this stage, the scales possess real physical hardness but do not carry a dragon’s magical properties or provide meaningful resistance against proper spellwork. 432 433
• Can transform a cork stopper continuously between fire, water, and wind, demonstrating exceptional adaptability with both material and formless transformations. 433 434
• Professor McGonagall provides him with exercises intended to further extend his senses and Transfiguration intuition. 434
• Later produces dragon scales containing magical power rather than merely imitating their appearance and hardness. He uses their thickness and hard surface to deform the iron restraint around his wrist; their resistance to hostile spells is not tested in this scene. 595
• Performs silent, wandless Transfiguration under intense external magical pressure, freeing his hands before addressing his ankle restraints and suppressing the sounds of the escape. 595

Dueling

Sirius has abundant magical power and talent, but originally lacked systematic training, spell variety, and combat discipline. 147 153

• Uses the Disarming Charm, Shield Charm, Slowing Charm, Repelling Charm, Stunning Spell, and Leg-Locker Curse. 153 154
• Improved at casting while moving, chaining spells, and responding to an opponent’s rhythm under Gerald Hawk’s instruction. 154
• His emotional state strongly affects his magic; when his emotions erupt, his magical output can become formidable. 266
• Was decisively defeated by Regulus’s defensive magic and a physical strike, revealing his early lack of focus and preparation. 147
• Defeated Rabastan Lestrange at the Lestrange family banquet on Regulus’s command. 309
• Fought Hermes Mulciber for approximately six to seven minutes without using Dark Arts; both were injured before Professor McGonagall ended the confrontation. 404
• Later casts a forceful Disarming Charm that dents a tree trunk after Regulus evades it, but again loses to his brother’s superior awareness and positioning. 594
• Demonstrates improved escape tactics and close-range initiative during Regulus’s staged abduction, retrieving his wand and bringing it to Regulus’s throat before recognizing him. The encounter remains a controlled test rather than an independent victory over Regulus. 595

Apparition

Sirius learns to Apparate and demonstrates the skill to Regulus before returning to Hogwarts. 356

• Regulus identifies Apparition as the basic entry point for developing spatial awareness. 270
• Sirius later successfully demonstrates Apparition, earning praise from Regulus. 356

Animagus Training

Sirius intends to become an Animagus out of loyalty and friendship rather than a desire for power. 147

• Views Animagus transformation as part of the advanced possibilities of Transfiguration. 351
• Has begun preparing for Animagus transformation. 351
• Later tells Alphard through correspondence that he is practicing Animagus transformation and progressing well, expressing confidence in his efforts. 592
• His Animagus form and a completed transformation are not specified in the provided context.

Intuition

Sirius possesses an unusual instinctive sensitivity, particularly regarding Regulus.

• While Regulus was concealed by an Improved Disillusionment Charm that hid sight, scent, heat, and magical fluctuations, Sirius still instinctively looked toward his brother’s location. 407
• This intuition appears to be distinct from trained magical perception and is linked to the brothers’ familial connection. 407

Flying

Sirius is a skilled and enthusiastic broom rider.

• Received an Outstanding grade in Flying after his first Hogwarts year. 10
• Performs daring maneuvers and energetic flights around Godric’s Hollow during his summer with the Potters. 593 594
• His enthusiasm often exceeds his caution; Charlus permits him considerable freedom while warning him against fatal recklessness, and Euphemia watches with concern. 594

Stealth and Concealment

Sirius has practical experience avoiding detection, though his methods remain unreliable against highly perceptive opponents.

• Has accumulated sneaking techniques through approximately three years of nighttime excursions with James while avoiding Filch. 594
• Combines a Vanishing Spell, Disillusionment Charm, and scent-blocking spell when following the hooded Regulus. 594
• Keeps low, moves between trees and bushes, and attempts to avoid noisy branches and fallen leaves. 594
• His Disillusionment leaves a visibly imperfect outline, while his breathing, heartbeat, footsteps, and fluctuating magical power remain detectable to Regulus. His concealment collapses entirely when he prepares his attack. 594
• Regularly uses the Potter family’s Invisibility Cloak with James for nighttime exploration of Hogwarts, without knowing its identity as a Deathly Hallow. 598

Relationships

• Regulus Black — Younger brother and longtime rival. Their early estrangement gradually develops into mutual respect, guidance, and cooperation. Sirius seeks Regulus’s approval but remains troubled by his brother’s association with Voldemort’s circle. Sirius also tries to support Regulus during the Rowle conflict, though he is compelled to remain hidden for his brother’s protection. Regulus later tests his abilities through a staged abduction, praises his improvement, and personally provides funds for his continued care with the Potters. Their antagonistic banter continues to conceal mutual concern. 147 267 302 390 538 595 597 598
• Orion Black — Father. Sirius finds Orion’s silence and authority more difficult to defy than Walburga’s anger; Orion later arranges his combat training and treats him more as an adult. Orion ultimately decides that Sirius should be removed from the family tree because his association with Dumbledore’s side makes him a potential target and a vulnerability for the family. 145 153 298 604
• Walburga Black — Mother. Their relationship is defined by repeated clashes over blood purity, family duty, and Sirius’s Gryffindor identity. Regulus agrees to inform her of Orion’s decision to remove Sirius’s name from the family tree. 5 9 10 604
• James Potter — Closest friend and source of belonging outside the Black household. Sirius often joins James in pranks and adventures, though Sirius becomes increasingly uncomfortable when James insults Regulus or the Black family. The two later share frustration and helplessness over their inability to aid Regulus during the Rowle crisis. Sirius imagines impressing James by capturing a suspected Death Eater and shares the use of James’s family Invisibility Cloak for nighttime excursions. 10 294 389 538 594 598
• Remus Lupin — Close friend. Sirius suspects Remus is a werewolf and immediately decides that the condition will not change their friendship. He subsequently joins the group’s established full-moon excursions toward the Whomping Willow and Shrieking Shack. 205 206 376
• Peter Pettigrew — Member of Sirius’s friend group and fellow Marauder. 10 390
• Charlus Potter — James’s father and a paternal figure within the Potter household. Charlus calms Sirius’s urge to rush to Regulus’s side during the Rowle crisis and persuades him to remain concealed for Regulus’s safety. He later accepts Regulus’s formal arrangement for Sirius’s care and the Gringotts key intended to cover his expenses. 538 598
• Euphemia Potter — James’s mother. Her quiet support of Charlus’s protective decision places Sirius within the Potter family’s response to the Rowle crisis. She treats him naturally as one of her own children, affectionately ruffling his hair and teasing him about his appetite. 538 598
• Alphard Black / Alpha — Disowned maternal uncle and correspondent. Sirius begins writing to him during his first Hogwarts year, frequently discussing Regulus and later reporting his progress in Animagus training. When Regulus mentions meeting Alphard, Sirius worries that his uncle has revealed the contents of his letters. 586 588 592 597
• Professor Minerva McGonagall — Recognizes Sirius’s Morphing Intuition and supports his Transfiguration development with advanced material, guidance, and exercises. She also acknowledges Regulus’s positive influence on his progress. 229 266 376 434
• Gerald Hawk — Black family retainer and former Auror who trains Sirius in foundational dueling and combat movement. 153 154
• Bellatrix Lestrange — Cousin whom Sirius openly despises for her fanatic loyalty to Voldemort. He attempts to intervene when she uses the Killing Curse against Regulus. 156 298 318
• Narcissa Black — Cousin whose relationship with Sirius becomes closer through Regulus and their shared family connections. 385
• Andromeda — Disowned cousin. Regulus later tells Sirius that she is living well in France, has opened a café in a Muggle neighborhood, and has given birth to Nymphadora, a Metamorphmagus. 597
• Kreacher — Black family house-elf. Kreacher disarms Sirius on Regulus’s command, shattering Sirius’s assumption that house-elves are incapable of threatening their masters. 299 300
• Rabastan Lestrange — A younger Lestrange whom Sirius defeats at the Black family’s request during the Lestrange banquet. 302 309
• Eleanor Bones — A Hufflepuff who complains to Regulus after Sirius damages her Mandrake plant. Sirius becomes visibly jealous when he sees her interacting with Regulus and continues to provoke her over the care of her plants. 216 516
• Rowle family — A hostile pure-blood family targeted by Regulus through a Family Vengeance Contract. Sirius wants to support Regulus against them but is prevented from openly acting. 538 541

Story Role / Major Arcs

Rebellion against the Black family

• Rejects pure-blood ideology and challenges Walburga’s teachings. 5
• Is sorted into Gryffindor, breaking five centuries of Black family tradition. 9
• Finds freedom, friendship, and belonging among the Potters and the Marauders. 10 11

Confronting his lack of strength

• Loses a sparring match to Regulus and realizes that talent alone is insufficient. 147
• Witnesses Regulus’s advanced training duel with Orion, gaining a clearer understanding of high-level combat and its dangers. 149
• Receives combat training from Gerald Hawk and begins improving his foundations. 153 154
• Identifies Transfiguration as his personal magical path. 229

Reconciliation with Regulus

• Questions Regulus about the Dark Mark and the nature of power. 269 270
• Reflects on how his rebellion shifted responsibility onto Regulus. 273
• Returns to Grimmauld Place voluntarily to understand his family without reflexive hatred. 294 295
• Accepts Regulus’s request to handle Rabastan Lestrange during the Black family banquet. 302
• Receives Regulus’s practical advice and indirect affection during visits to the Potters, despite reacting defensively to his younger brother’s protective manner. 522 598

Seeking the power to help his brother

• Begins to understand that shouting opposition to Voldemort is not enough to change Regulus’s circumstances. 387
• In the aftermath of Pollux Black’s funeral, resolves that he needs power to protect or pull Regulus away from the forces surrounding him. 389 390
• Attempts to return to Regulus’s side after the Family Vengeance Contract against the Rowles becomes public, but accepts that concealing himself is necessary to avoid compromising Regulus. 538

Pursuing advanced Transfiguration

• Develops Morphing Intuition through sustained practice under Professor McGonagall’s supervision. 229 266 267
• Learns Apparition as an entry point toward broader spatial awareness. 356
• Achieves localized Human Transfiguration by forming Hebridean Black Dragon scales across his forearm. 432 433
• Demonstrates elemental transformation by converting a cork stopper into fire, water, and wind. 433 434
• Continues Animagus practice and reports promising progress to Alphard. 592
• Advances to silent, wandless Transfiguration and dragon scales containing magical power, applying both during his escape from Regulus’s staged captivity. 595

The Rowle family crisis

• Reacts with anger when news reaches the Potter household that Regulus has activated a Family Vengeance Contract against the Rowle family. 538
• Is persuaded by Charlus Potter to remain hidden rather than openly confront the danger, demonstrating greater restraint than in his earlier conflicts. 538
• His magical signature is later sensed from a distant hill during Regulus’s confrontation with the Rowles on Stanmore Moor. 541
• Remains with the Potters after the conflict and resumes exuberant summer activities in Godric’s Hollow. 593 594

The Godric’s Hollow encounter

• Spots a hooded figure while flying and assumes that he may be a Death Eater operating near the Potter home. 594
• Follows the figure using layered concealment spells but fails to hide his emotional magical fluctuations or prepare for a stronger opponent. 594
• Attacks with a Disarming Charm, only for the disguised Regulus to evade it and incapacitate him. 594
• Awakens restrained in a sinister underground chamber created by Regulus as a practical test. 595
• Abandons ineffective intimidation, escapes through precise Transfiguration, and retrieves his wand before recognizing his brother. 595
• Earns Regulus’s approval for his technical improvement and later warns him against provoking another potentially dangerous attack. 595 597

Handover to the Potter family and planned disownment

• Lives comfortably with Charlus, Euphemia, and James in the warm Potter household, in contrast to the oppressive atmosphere of Grimmauld Place. 598
• Regulus formally entrusts him to the Potters and provides personal funds for his daily expenses. 598
• The handover anticipates eventual disownment without treating it as a severance of the brothers’ personal bond. 598
• Orion and Regulus agree that removing Sirius from the family tree will reduce the danger posed by enemies exploiting his ties to both the Blacks and Dumbledore’s side. Regulus undertakes to inform Walburga. 604

Trivia

• Sirius was named after the brightest star in the night sky. 1
• His gray eyes are shared with his father, Orion. 145
• He has a habit of standing with his hands in his pockets and adopting an outwardly casual posture even during serious conversations. 269
• He reacts strongly to Bellatrix taking his arm at formal events, finding the idea revolting. 298
• Regulus considers Sirius naturally suited to stand with Dumbledore, giving the Black family an alternative path for survival. 54
• Sirius’s Transfiguration practice notes are densely written but notoriously messy, resembling “a nest of earthworms.” 433
• His letters to Alphard are similarly careless and unrestrained, sometimes marked by splattered ink. 588
• During Regulus’s staged abduction, Sirius invokes his younger brother’s reputation as part of his attempt to intimidate the supposed stranger. 595
• Regulus teasingly calls him “Miss Black” during the formal handover to the Potters. 598
• Despite frequently using the Potter family’s Invisibility Cloak with James, Sirius does not know that it is one of the Deathly Hallows. 598