When he spoke Parseltongue, a lot of students at Hogwarts thought Harry Potter was the Heir of Slytherin. He suspected it was Draco Malfoy until he discovered it couldn't be, and the Diary told Harry it was Hagrid, which Aragog denied.
Looking into the past, the true heir of Slytherin turns out to be none other than Tom Marvolo Riddle, better known as Lord Voldemort, the Dark Lord. Besides his ability to speak Parseltongue, which he passed on to Harry after he survived his attack, his bloodline was linked to the Hogwarts founder.
Ginny Weasley was possessed by Tom Riddle's (Voldemort's) Horcurx at that time. Tom Riddle was indeed a Heir of Slytherin and a Parseltongue, so Ginny didn't run into any trouble opening the Chamber of Secrets.
The Peverells, Gaunts, Blacks, Malfoys, Potters, Weasleys, Prewetts, and other families are all linked to one another through bloodlines and intermarriage. The only known direct descendants from Salazar Slytherin were the Gaunts, who for the most part shared their ancestor's beliefs in the purity of wizard blood.
Voldemort intended Draco to die in the attempt to kill Dumbledore so that Lucius would be punished for his failure to retrieve the prophecy from the Ministry of Magic.
Harry, as heir of Gryffindor, possessed the love of this Muggle-born woman in his very blood and was the perfect champion to stand up against the heir of Slytherin.
Her real parents were Daneel and Dean Novak, Pureblooded wizards. Turns out Daneel was Tom Riddles younger sister, Daneel Riddle. Of course, the Riddles were related to Salzar Slytherin himself, and this made Hermione the living heir of Slytherin.
Ginevra Molly Weasley (also known as Ginny) is the youngest child and only daughter of the Weasley family. She is Sorted into Slytherin during Harry and Jim Potter's second year.
During this year, Narcissa became pregnant and miscarried. She was distraught and uncertain of what to tell Lucius, as she had not told him of her pregnancy. Shortly thereafter, he brought her out to the Leaky Cauldron to visit with his friends Vettlingar Yaxley and Thorfinn Rowle.
A member of the house of Black, one of the oldest wizarding families, Bellatrix was also Draco Malfoy's aunt. Renowned for her cruelty and sadistic nature, many of the acts of torture and violence against Voldemort's enemies were carried out by Bellatrix Lestrange.
By Harry Potter and the Deathly Hallows, it's a stretch to call Draco a villain anymore. We just watched — or read — him struggle to reconcile his choices and morals in The Half-Blood Prince. He can no longer justify his actions, and is far more aware of the evil he was born and raised into.
Scorpius Hyperion Malfoy (b. c. 2006) was a British pure-blood wizard and the only child and son of Draco and Astoria Malfoy (née Greengrass). He attended Hogwarts School of Witchcraft and Wizardry from 2017 and onwards and was sorted into Slytherin House.
It follows Albus Severus Potter, son of Harry Potter, who is now Head of the Department of Magical Law Enforcement at the Ministry of Magic. When Albus arrives at Hogwarts, he gets sorted into Slytherin, and fails to live up to his father's legacy, making him resentful of his father.
He actually asked the Sorting Hat to place him in Hufflepuff, as he was intimidated by Gryffindor's reputation for bravery, but the Sorting Hat didn't agree.
She and her husband were proud and accepting of their daughter's identity as a witch, which explained some strange things which happened around her when she was a child. They entered the magical world in 1992 to buy Hermione's school supplies, and were assisted by Arthur Weasley.
Dorea Black is the connecting force between Harry and Draco, making the rivals distinct cousins. Due to the tragic deaths of Harry's parents and grandparents, the Black family tree shows that Draco is one of Harry's closest living relatives.
Since goblin metal takes in only that which makes it stronger and rejects anything that would weaken it, Gryffindor's blade couldn't have been turned into a Horcrux. Likely, the soul fragment would have been rejected, which could have seriously impacted Voldemort's plans in Harry Potter.
J.K. Rowling says Draco doesn't have a patronus because he never learned the spell but I think it's because he doesn't have any powerful happy memories to use.
Family. Snape's family background is mostly shown in flashbacks during the course of the last three novels. Snape was born to Eileen Prince, a witch, and Tobias Snape, a Muggle, making him a half-blood (hence the name, "Half-Blood Prince").
Yes. Draco's mother is Sirius first cousin on his mother's side (Narcissa and Sirius are also second cousins on his father's side, as Sirius parents are first cousins).
