Neville is a pure-blood wizard born to Frank and Alice Longbottom, who were prominent Aurors and also members of the Order of the Phoenix during the first war against Lord Voldemort.
Pure-blood was a term referencing wizarding families or individuals descended only from magic, with no Muggles, Squibs or Muggle-born witches or wizards in their family.
Neville comes from a long-line of pure-blood wizards, although we don't know as much about the individuals as we do with some other wizarding families. What we do know is that both of Neville's parents were pure-blood, as was his gran, Augusta.
Slytherins isn't just for pure bloods at all - if it was there'd only be a few in each year. Slytherin is for the cunning and ambitious- so that is anyone who has these traits: including pure bloods, half bloods and muggle born.
An interesting fact of note is that despite the ideals that pure-bloods are inherently more powerful wizards, some of the most powerful or particularly adept wizards and witches in the series are in fact either half-blood (such as Lord Voldemort, Albus Dumbledore, Minerva McGonagall, Severus Snape and Harry Potter) or ...
McGonagall was born a half-blood witch as her father was a Muggle and her mother a witch. McGonagall began her Hogwarts education at the age of eleven and was sorted into Gryffindor after being the longest ever Hatstall between Gryffindor and Ravenclaw.
The pure-blood wizards and witches featured in the Harry Potter books are almost all supremacists, while there are some of them who do not advocate ancestral superiority; the Potters, Weasleys, and Longbottoms are old pure-blood families, but no known members of these families are sympathetic to supremacist aims.
Muggle-born Slytherins existed, but were very rare, as noted insultingly by Scabior the Snatcher. There had also been definite examples of half-bloods sorted into the house, including Tom Riddle, Dolores Umbridge, and Severus Snape.
Astoria Malfoy (née Greengrass) (c. 1982 – August 2019) was a British pure-blood witch and a member of the Greengrass family, one of the Sacred Twenty-Eight.
Plus, it was implied in Harry Potter and the Goblet of Fire that he was pure-blood which could serve to be another factor in his wealthy background. Despite this, Cedric never managed to inherit the fortune of the Diggory family given his untimely death at the hands of Lord Voldemort.
“He wants to have a stable job at Hogwarts. And Luna is a bit too kooky and out there for him and she wants to go out and travel the world. And their lifestyles just wouldn't mix.
Probably. All the pure-blood families are related, and on the Black family tree, Draco's great-grandfather's first cousin Callidora Black marries one Harfang Longbottom, who is likely a relation of Neville's.
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. They debated it for so long, that he was close to being what is known as a Hatstall, which is a term for any student whose Sorting takes longer than five minutes.
Draco Lucius Malfoy (b. 5 June 1980) was a British pure-blood wizard and the only son of Lucius and Narcissa Malfoy (née Black). The son of a Death Eater, Draco was raised to strongly believe in the importance of blood purity. He looked down on half-bloods and Muggle-borns.
Albus Severus Potter (b. c. 2006) was an English half-blood wizard, the second son of Harry and Ginevra Potter (née Weasley) and the godson of Neville Longbottom. He was born two years after his older brother James Sirius and two years before his younger sister Lily Luna.
Luna Lovegood is a Pureblood witch, who was sorted into Gryffindor House during Harry Potter's second year at Hogwarts School of Witchcraft & Wizardry.
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.
Luna married fellow naturalist Rolf Scamander, grandson of Fantastic Beasts and Where to Find Them author Newt Scamander, considerably later in life than Harry, Ron, Hermione, and Ginny, who all married and started families in their early-to-mid twenties.
J.K. Rowling said that Draco had a crush on Hermione Granger, but he doesn't show that, beacuse Hermione was a Gryffindor, Harry's friend, and also a muggle-born. After the Battle for Hogwarts, Draco fell in love with Astoria Greengrass, and they had son Scorpius.
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.
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.
The Malfoy family consisted of an ancient line of pure-blood wizards, most of whom attended Hogwarts School of Witchcraft and Wizardry and were traditionally sorted into Slytherin House.
