Magical ability. Sirius was described as a powerful wizard by Minerva McGonagall, his former teacher. Sirius became an Animagus at only age fifteen, and was able to turn himself into a large black dog.
Sirius was an animagus and was able to transform into a big black dog, (a Grim) which is an omen of death, at will. He, along with James Potter and Peter Pettigrew became Animagus to help Remus Lupin with his transformations.
But most of all, look at the ancient stone archway that stands in the middle of the Death Chamber, with its veil, through which Sirius Black famously fell, never to return. It's a portal from which the whispers of the dead can be heard. What is the veil? It's one of the Harry Potter series' great questions.
Sirius and Harry's relationship is an interesting mix of friends and family too: Sirius is Harry's godfather and sometimes treats him like a son, but at other times he seems to forget Harry isn't his best friend, James Potter.
Sirius Black can turn into a Dog because he was an “Animagus”. An Animagus is a witch or wizard who could transform themselves into an animal and back again as per their choice.
Hermione is the brightest witch of her age, and she would be the first in the group to successfully transform into her Animagus form, a rather fitting fox.
Strikingly, Harry's Patronus was a stag and his mother Lily's was a doe, a female deer, showing that the family's characters were in harmony and formed part of the same animal group.
The Malfoys are related to the Black family through Narcissa (a first cousin of Sirius Black, Harry's godfather), which makes Draco a nephew of both Bellatrix Lestrange and Andromeda Tonks. Draco is also Nymphadora Tonks' first cousin through their mothers.
The British Wizarding World isn't terribly large, so many families are related. According to the Black family tree that's referenced multiple times throughout the series, Draco's great-great-aunt, Dorea Black, married Charlus Potter, who was most likely a relation of Harry's grandfather.
12 Grimmauld Place holds a special place in Harry Potter lore. The ancestral home of Sirius Black's family, the property is headquarters to the Order of the Phoenix and was inherited by Harry after Sirius' death.
Sirius was described as a powerful wizard by Minerva McGonagall, his former teacher. Sirius became an Animagus at only age fifteen, and was able to turn himself into a large black dog. As he is unregistered, he is able to take advantage of his ability to continually elude the Ministry of Magic.
Upon the dais is a stone archway, covered with a tattered black veil. Sirius is hit by Bellatrix's curse, and his stunned body arcs into the air and floats through the archway, disappearing behind the veil.
Sirius Black
"Come on, you can do better than that!"
Definition: An Animagus is a witch or wizard who can transform at will into an animal. In Harry Potter and the Prisoner of Azkaban, Remus Lupin shared that it took his fellow Marauders – James, Sirius and Peter – until their fifth year at Hogwarts to finally become Animagi and keep him company in his werewolf form.
Remus was turned by Fenrir Greyback, who sought revenge on his father for his unkind words about the werewolf community. The attack took place just before his fifth birthday, and although Lyall burst in and saved his son from death, the attack left Remus as a werewolf himself.
So how are Sirius and the Weasleys related? Phineas Nigellus Black is Sirius' great-great-grandfather and Arthur's great-grandfather, making the two men second cousins once removed.
Having rendered unknown, shady (and almost certainly magical) services to King William I, Malfoy was given a prime piece of land in Wiltshire, seized from local landowners, upon which his descendants have lived for ten consecutive centuries.
Lyra Druella Malfoy ( b. 1977 ) was a Pure-blood witch, born to Lucius and Narcissa Malfoy (née Black), the twin of Talitha Malfoy and the elder sister of Draco Malfoy.
Though Voldemort utterly trusts and relies on her, he would likely sacrifice her, as he did Snape, if it served his evil purpose. Bellatrix Lestrange's sisters are Narcissa Malfoy, Draco's mother, and Andromeda Tonks, mother to Nymphadora Tonks.
Blaise Zabini was a student in Harry Potter's year at Hogwarts School of Witchcraft and Wizardry. He was a student in Slytherin and was part of Draco Malfoy's gang of bullies. He appeared in Harry Potter and the Half-Blood Prince and Harry Potter and the Deathly Hallows: Part 2.
MASS BREAKOUT FROM AZKABAN was a Daily Prophet article about the 1996 mass breakout from Azkaban, in which ten Death Eaters, including Bellatrix Lestrange, Antonin Dolohov, and Augustus Rookwood, were able to break out of their cells with the help of the Dementor guards, who had switched sides and were following Lord ...
Was Voldemort an Animagus? No, Voldemort was not an Animagus. He didn't see any reason to become an Animagus despite being a gifted wizard and knowing a lot of magic. This may simply be because his sole purpose was to obtain immortality and become the strongest wizard who could control the world around him.
By the end of the series he could transform into a bat.
A teacher who taught the skill did not need to be an Animagus themselves, as shown when Professor Dumbledore, who was not an Animagus, taught Minerva McGonagall how to successfully become one.