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

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
Third year	Elemental Transformation	Transforms a cork stopper successively into fire, water, and wind, demonstrating that his Morphing Intuition extends to formless elements. 433

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

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

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

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

• 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
• 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. 432

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 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. 229 435

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
• Successfully performs localized Human Transfiguration by reshaping the skin of his forearm into Hebridean Black Dragon scales. The scales possess real physical hardness but do not yet carry a dragon’s magical properties or provide meaningful resistance against proper spellwork. 432
• Can transform a cork stopper continuously between fire, water, and wind, demonstrating exceptional adaptability with both material and formless transformations. 433
• Professor McGonagall provides him with exercises intended to further extend his senses and Transfiguration intuition. 433

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

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
• His Animagus form is 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

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. 147 267 302 390
• 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. 145 153 298
• Walburga Black — Mother. Their relationship is defined by repeated clashes over blood purity, family duty, and Sirius’s Gryffindor identity. 5 9 10
• 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. 10 294 389
• Remus Lupin — Close friend. Sirius suspects Remus is a werewolf and immediately decides that the condition will not change their friendship. 205 206
• Peter Pettigrew — Member of Sirius’s friend group and fellow Marauder. 10 390
• Professor Minerva McGonagall — Recognizes Sirius’s Morphing Intuition and supports his Transfiguration development with advanced material, guidance, and exercises. 229 266 433
• 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
• 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. 216

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
• 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

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

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
• Demonstrates elemental transformation by converting a cork stopper into fire, water, and wind. 433

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.” 432