In 1959, Sirius was born in "the oldest and noblest house of blacks."
This is an extremely pure-blood family that prides themselves on pure-blood wizarding blood
Sirius's home is at 12 Grimmauld Square in London, an extremely safe house subject to multiple protective spells such as the Bold Loyalty Spell (Sirius also used it as the first headquarters of the Order of the Phoenix as an adult)
Sirius also has three cousins, Bellatrix Lestrange (originally black, changed his surname after marriage), Andromeda Tonks (originally black, changed his surname after marriage) and Narcissa Malfoy (originally black, changed his surname after marriage)
Arthur Weasley was the great-grandson of Sirius's uncle and grandfather, and Molly Weasley and his cousin were related by marriage
Due to their fanatical obsession with pure wizarding bloodlines, Sirius's parents were quite supportive of Voldemort's pure-blood wizarding views
Prior to Sirius, almost all members of the Black family were assigned to Slytherin House at Hogwarts
However, sirius was assigned to Gryffindor House after enrollment, which also shows Sirius's character and rebellion against family beliefs
After enrolling, Sirius soon became acquainted with James, Lupin, and Peter, the four of whom called themselves "Predators."
Young and crazy boys always like to be mischievous, they take pleasure in violating school rules and regulations, and often make Gryffindor a miasma, causing headaches for professors
Clever Sirius soon guessed Lupin's werewolf identity, and in order to better help and protect Lupin, he began to study the Animagus metamorphosis
After a few years, Sirius, James, and Peter finally learned the Animagus Transfiguration, which could transform into a large black dog, a stag, and a mouse
Of the four, Sirius and James had the best feelings, both of them so clever and so mischievous
With the help of the Invisibility Cloak and Marauder's Map, they can play pranks anytime, anywhere, without being discovered by the school teacher
In addition to possessing a high wizarding talent, Sirius is also a handsome boy
During school, there were many girls who liked Sirius, but Sirius, who was nervous, only liked to play with James
The cheerful Sirius and Snape had a somewhat bad relationship, and they always hated each other, even directly insulting or attacking
Of course, this is mainly because the four, led by Jaime, always like to bully Snape consciously or unconsciously, and Snape is a Slytherin who prides himself on the idea of a pure-blood wizard
At the age of 16, Sirius chose to run away from home and come to the house of his best friend James due to a serious conflict with his parents' pure-blood philosophy
James's parents were so nice to Sirius that they even treated him as their own biological son
Sirius's relationship with his parents grew worse and worse, so much so that in the end, Sirius's mother simply removed his name from the family tree
In 1979, James and Lily entered the palace of marriage, and Sirius attended the wedding as a groomsman
Several adults curbed the misbehaving and disrespectfulness of their youth, took the initiative to join the Order of the Phoenix against Voldemort's faction, and served as a backbone member of the Order of the Phoenix
During this time, Sirius and James's relationship grew better and better, and James even made Sirius the godfather of his children
When Voldemort learned of the Prophecy of the Children of July, he decided that Harry was the Son of Prophecy and began to hunt down the James family
To protect their son, Jaime and Lily use the Red Spirit Loyalty Charm and have Sirius be their keeper
But it didn't take long for Sirius and James to decide to replace the identity of the secretion with Peter, who was more reliable in Sirius's eyes
Unexpectedly, Peter eventually betrayed the James and his wife and directly told Voldemort the location of the James family
As a result, the James family suffered an accident, and Harry accidentally survived and became an orphan
When Sirius discovers that something is wrong with Peter, he first arrives at Peter's residence, only to find that he is no longer there
Sirius rides his flying motorcycle to Godric's Hollow, where the James family is located, only to find it too late
Hagrid, who had been assigned by Dumbledore to go to Godric's Hollow, happened to encounter Sirius, who had arrived in an emergency
Seeing that James and Lily's son had survived unexpectedly, Sirius insisted on taking Harry away as the godfather, but was stopped by Hagrid
So Sirius gave Hagrid his flying motorcycle to take good care of Harry
Sirius turns to capture peter the informant, but allows peter to escape and kills a street of Muggles
In the explosion, Peter severed one of his fingers and pretended to be killed in the battle to protect James and Lily, and escaped successfully
After Peter escapes, Sirius is identified as a whistleblower who betrayed James's family and is imprisoned in Azkaban Prison without trial
At that time, even his good friend Lupin believed that Sirius had told Voldemort the location of the James family
During his 12 years in Azkaban Prison, Sirius remembered his enemies who betrayed James and Lily, and he was soberly aware of his innocence
In 1993, Sirius inadvertently asked Cornelius Fudge for a copy of the newspaper of the time, and came across the Weasleys in the newspaper
He recognized at a glance the Ron Weasley holding Peter in the form of a mouse
He did not expect that after so many years, the original informant Peter was still alive, and he was still with Harry
Sirius's desire to survive and his fighting spirit was once again ignited, and he could not see Peter hurt Jaime's family once again
So, that night, Sirius transformed into a large black dog and escaped from prison in the gap between the Dementors' inattention
For the first time in 12 years, as a godfather, he saw Harry in the alley between Magnolia Crescent Street and Wisteria Road
He quietly follows Harry into Hogwarts in the form of a black dog and becomes friends with Hermione's cat (Crook Mountain).
When he learned that Harry's broom was broken, Sirius immediately gave Harry one of the best firebolt broomsticks
It was the only thing he could do for Harry as a godfather
In addition to secretly protecting Harry, Sirius is actively searching for Peter's whereabouts
He has been lurking near Hogwarts, waiting for the right moment to bring Peter to justice
In 1994, in the Screaming Shack, Harry, Ron, and Hermione first met Sirius, a skinny, inhuman, escaped from prison, and finally learned the truth
But unfortunately, this time, whistleblower Peter escaped again
In order to protect Harry from Voldemort and escape the pursuit of Azkaban, Sirius transformed into a large black dog and traveled to Hogsmeade and lived in a cave, continuing his dismal life of escape
With Dumbledore's help, Sirius began to quietly organize the old members of the Order of the Phoenix to fight Voldemort together
Sirius made his old mansion the headquarters of the Order of the Phoenix and co-organized the Order of the Phoenix affairs with Lupin
Unexpectedly, during the battle of the Department of Mysteries, Sirius was hit by the spell of his cousin Bellatrix Lestrange, fell into the curtain of yin and yang, and left Harry completely