Sirius

Biodata

Feature	Details
Name	Sirius Black
Original Name	小天狼星
Alias(es)	Black — name used while disguised as Harley's stray dog 172
Species/Race	Human wizard; illegal Animagus whose form is a large black Scottish Deerhound 169 226
Gender	Male
Affiliation	House of Black; Gryffindor alumnus; works alongside the Order of the Phoenix 241 345
Occupation/Role	Harley Potter's godfather; later assigned by Dumbledore as a scout monitoring Malfoy Manor 226 391
Status	Alive; active on Dumbledore's behalf 391
First Appearance	Chapter 157 (mentioned as an Azkaban escapee); Chapter 169 (first on-page appearance) 157 169

Background

During his Hogwarts years, Sirius was a Gryffindor alongside James Potter, Remus Lupin, Peter Pettigrew, and Severus Snape. He was particularly skilled at Charms, helped create the Marauder's Map, and became an unregistered Animagus with James and Peter. James's Transfiguration expertise was central to their Animagus work. 242 226

Sirius served as Secret-Keeper for James and Lily Potter before changing the role to Peter because he suspected Lupin of being the traitor. Peter's betrayal led to James and Lily's deaths, a decision Sirius regards as his most catastrophic mistake. 182 272

Blamed for the Potters' deaths and publicly branded a Death Eater, Sirius spent twelve years in Azkaban. He escaped in his dog form after identifying Peter Pettigrew in a newspaper photograph, then survived by scavenging and hunting while searching for Peter. 157 170 182

Appearance

Sirius is a black-haired, middle-aged wizard whose years in Azkaban left him thin, aged, and streaked with silver hair. His human voice is hoarse but described as magnetic. 181 226

• Animagus form: A large black Scottish Deerhound. 169
• Condition after escape: Initially filthy, matted, malnourished, and weakened by imprisonment. 168 170
• After grooming: His black fur is soft and slightly lustrous, though threaded with silver. 170 181

Personality

Sirius is fiercely loyal, emotionally direct, and impulsive. His love for James, Lily, Harley, and Lupin drives many of his choices, from pursuing Peter to accepting Harley's right to decide Peter's fate. He is deeply proud of Harley, but also protective of her and wary of her involvement with Dark Magic. 226 227 246

His imprisonment and guilt have damaged his confidence in his own judgment. He openly admits that his independent decision to trust Peter caused the Potters' deaths, and later prefers to defer strategic decisions to Harley rather than risk repeating that failure. 272

Sirius remains mischievous, untidy, and prone to provoking others—especially Severus Snape. He has poor table manners, struggles to maintain Grimmauld Place, and repeatedly causes trouble through enthusiasm rather than malice. 229 241 259 346

Abilities & Skills

Animagus Transformation

Sirius can transform into a large black Scottish Deerhound without a wand.

• Used the form to escape Azkaban and travel unnoticed while searching for Peter Pettigrew. 169 170
• Can adapt to a dog's diet and gained enhanced vision in animal form. 170 188
• Can modify his vocal cords to speak human language while remaining transformed. 188
• His Animagus identity was unregistered and therefore illegal. 226
• Dumbledore later deploys him as a forest-capable scout near Malfoy Manor, with Muggle grooming used to further conceal his identity. 391

Charms and Transfiguration

Sirius identifies Charms as his strongest Hogwarts subject and credits himself as a principal contributor to the Marauder's Map.

• Helped create the Marauder's Map alongside James, Remus, and Peter. 242
• Became an Animagus through advanced Transfiguration, aided substantially by James Potter. 242
• Uses practical combat magic, including the Petrification Curse and Incarcerous. 259
• Is confident in his wandless magic, though he considers a wand necessary for safely handling the defenses of Grimmauld Place. 235

Combat and Training

Azkaban left Sirius weakened and without his original wand; Harley initially judges him no match for her in that condition. 172

• Acquires a new wand from Ollivander and keeps a second-hand wand as a backup. 235 241
• Spars with Harley but is repeatedly defeated, eventually yielding the session to Lupin. 345
• Recognizes the need to improve and hires Lupin as his tutor after Regulus's recovery. 248

Equipment / Holdings

• Combat wand — Newly purchased from Ollivander after his exoneration. 235
• Backup wand — A battered second-hand wand bought in Knockturn Alley. 241
• Enchanted motorcycle — A self-designed Muggle motorcycle modified for flight and invisibility; previously left with Hagrid. 259
• Number 12 Grimmauld Place — Inherited Black family home protected by layered magical defenses. 229 241
• House of Black library — A collection divided into ordinary, advanced, and Dark Magic sections; Sirius warns Harley and Hermione away from its most dangerous books. 241
• Enlarged pocket — An enchanted Black family pocket with an Undetectable Extension Charm, used to carry the recovered Horcrux. 248

Relationships

• Harley Potter — His goddaughter and one of his few remaining family members. Sirius is proud of her power, accepts her decisions regarding Peter, and frequently relies on her judgment. 226 227 272
• James Potter — Closest school friend and Harley's father. James helped Sirius become an Animagus; Sirius's guilt over failing him shapes his actions after Azkaban. 242 272
• Lily Potter — James's wife and Harley's mother. Sirius's devotion to Harley is closely tied to his grief over Lily's death. 169 227
• Remus Lupin — Old friend, fellow Marauder, and later Sirius's tutor. Their relationship survives Sirius's mistaken suspicion of Lupin and is restored after Lupin verifies Sirius's memories through Legilimency. 182 248
• Peter Pettigrew — Former friend and the true traitor responsible for betraying the Potters. Sirius initially seeks to kill Peter but ultimately accepts Harley's decision to let justice proceed. 226 227 230
• Regulus Black — Sirius's younger brother. Sirius mourns Regulus after learning of his sacrifice against Voldemort, retrieves his body from the cave, and buries him as a hero. 229 242 248
• Kreacher — Black family house-elf. Their relationship begins in open hostility, particularly after Sirius learns of Regulus's death, but Kreacher becomes more respectful once Sirius commits to bringing Regulus home. 242 243 244
• Severus Snape — Longstanding school rival. Sirius openly despises Snape and remains evasive about the actions he and the Marauders took against him at Hogwarts. 227 389
• Albus Dumbledore — A trusted authority after Sirius's escape. Dumbledore oversees the investigation that clears Sirius and later assigns him reconnaissance work. 169 226 391

Story Role / Major Arcs

Fugitive and “Black Dog”

After escaping Azkaban, Sirius reaches the Dursleys' area in Animagus form. Harley captures and adopts him as a stray dog named Black, unaware of his identity; she feeds, grooms, and brings him to Hogwarts. Sirius stays close to her both to understand her existence and to pursue Peter Pettigrew. 169 170 172

Reunion with Lupin and Hunt for Peter

Sirius covertly reconnects with Lupin on the Hogwarts Express. Lupin initially restrains and distrusts him, but confirms Sirius's account through Legilimency after finding the Weasley newspaper photograph containing Peter in rat form. The two begin planning Peter's capture while Sirius remains disguised. 174 181 182

Exoneration

Harley exposes Sirius's identity after capturing Peter Pettigrew. Veritaserum testimony confirms Peter's betrayal, leading to Sirius's acquittal and Peter's life sentence in Azkaban. 226 227 230

Regulus and the Black Family Legacy

At Grimmauld Place, Sirius learns that his brother Regulus died attempting to destroy Voldemort's locket Horcrux. Though he initially directs his grief at Kreacher, he joins Harley, Lupin, and Kreacher to retrieve Regulus from Voldemort's cave. Sirius later buries Regulus in the Black family graveyard and honors him as a hero. 242 243 244 248

Post-Azkaban Life

Following his exoneration, Sirius reclaims Grimmauld Place, purchases new wands, attends the Quidditch World Cup with Harley and Hermione, and continues pursuing Peter after Peter's second escape. 235 253 260

As Voldemort's influence grows, Sirius and Lupin investigate werewolf and dark wizard activity for Dumbledore. Sirius later serves as a scout around Malfoy Manor in his Animagus form. 344 345 391

Notable Quotes

“Harley, I am proud of you. I think James and Lily would feel the same way.” 226

“The mistakes I have made cannot be undone…” 226