Many Slytherin students became Death Eaters, including prominent figures like Severus Snape, Lucius Malfoy, Bellatrix Lestrange, and younger ones like Draco Malfoy, along with many others from Voldemort's generation such as Avery, Mulciber, and Regulus Black, with most prominent Death Eaters originating from Slytherin due to its association with ambition and blood purity ideals.
Pretty much all the prominent Death Eaters we know of were Slytherins, eg Bellatrix, Lucius, presumably Nott, Crabbe and Goyle were Slytherins, the only Death Eater we know for sure wasn't a Slytherin was Peter Pettigrew.
After graduating from Hogwarts, he became a Death Eater. Avery participated in the First Wizarding War, but like most Death Eaters, didn't search for Lord Voldemort after his downfall, although he was forgiven after his master's return.
Corban Yaxley was one of the many Death Eaters who fought in the First Wizarding War.
However, in some of the timelines, Cedric becomes a Death Eater as a result of this humiliation, then leading Voldemort to win the Battle of Hogwarts. Thus, Albus and Scorpius realize that Cedric's death is tragic but a necessary sacrifice to save the world from a terrible fate.
Peter Pettigrew (aka Wormtail) is one of two Death Eaters known to have been in a House other than Slytherin (Gryffindor) while at Hogwarts. There, he was a close friend of Sirius Black, James Potter, and Remus Lupin, although he was the least intelligent and least talented of the group.
There's no single "saddest" death, as fans cite different characters, but Dobby, Sirius Black, Fred Weasley, Remus Lupin, and Snape are consistently named among the most heartbreaking due to their profound loyalty, tragic lives, or sudden, impactful losses, with Dobby's selfless sacrifice often topping lists for his pure heart and newfound freedom, and Fred's death devastating his twin George and family, notes Quora and Facebook users https://www.facebook.com/groups/309399756202202/posts/2389613828180774, and Reddit.
As for Ron, Hufflepuff is probably the worst house for him. He's not hard-working (unless he really has to be), particularly tolerant (look at his treatment of Krum, for instance), or patient (see the first half of Deathly Hallows).
However, at the climax of the story, when the manifestation of Riddle rearranges the letters in his name to write "I am Lord Voldemort", it is revealed that Tom and the Dark Lord are just one person and that he is a descendant of one of the school's founders, Salazar Slytherin.
She was sorted into Slytherin House at Hogwarts School of Witchcraft and Wizardry and hated her time at the school due to never being given any positions of power. After her time at Hogwarts, Umbridge rose to prominent and influential positions in the Ministry of Magic in the Improper Use of Magic Office.
It never really was forbidden - just that certain places like the chamber there and the Hogsmeade secret entrance were the only things there. It was forbidden during Harry's first year of Hogwarts. It was out of bounds to everyone that did not wish to die a most painful death.
Snape explained in Half Blood Prince that he didn't know Voldemort was with Quirrell. Snape explained to Voldemort that had he known, he would have helped Quirrell retrieve the Sorcerer's Stone (Philosopher's Stone for my English friends). Snape genuinely thought that Quirrell was trying to steal it for himself.
In the film adaptation of Harry Potter and the Goblet of Fire, Crabbe was played by Paschal Friel. It is not specified if Crabbe attended Hogwarts School of Witchcraft and Wizardry. It's likely that he was the Death Eater whose head turned into that of a baby during the Battle of the Department of Mysteries.
Hufflepuff is often considered the worst house at Hogwarts because it hasn't contributed as much to magic as other houses, except for a few exceptions like Newt Scamander. Hufflepuffs are known for their hard work but it rarely leads to major magical discoveries.
In both the Harry Potter and the Deathly Hallows book and film, Hedwig dies during the Battle of the Seven Potters. In the book, Hedwig is hit by a random Avada Kedavra and instantly dies. In the movie, Hedwig is killed because she was trying to protect Harry.
In Harry Potter, the "Three D's" are the essential principles for successful Apparition (magical teleportation): Destination, Determination, and Deliberation, taught by Ministry instructor Wilkie Twycross to avoid "splinching" (leaving body parts behind). You must firmly visualize your Destination, have the unwavering Determination to reach it, and then move with focused Deliberation, without haste, to arrive safely, notes the Harry Potter Wiki and Harry Potter Lexicon.
Voldemort found Nagini in Albania after his initial defeat, likely while he was a weak spirit possessing snakes; she was a unique, powerful snake, possibly a Maledictus (a witch with a blood curse turning her into a beast), making her an ideal companion, and he eventually made her his final Horcrux by murdering Bertha Jorkins with her present. Their connection deepened as he used her venom to sustain himself and later made her a container for his soul, ensuring their bond was profound and twisted.
In the books are explained that Tom Riddle is indeed the heir of slytherin because his mothers side of the family are related to Salazar slytherin. If you want a better understanding then read the books.
The Riddle family was a very old Muggle family who had been established in the area around the Hangleton villages for quite some time. The family was very wealthy and owned much of the village of Little Hangleton, ruling over their lands from the handsome and large Riddle House.
The main LGBTQ+ character confirmed by J.K. Rowling is Albus Dumbledore, revealed to be gay and to have had a passionate, intense love relationship with the dark wizard Gellert Grindelwald in their youth, though this isn't explicitly detailed in the books but rather in later interviews and supplementary materials. While not canon, some fans also interpret other characters like Sirius Black, Remus Lupin, or even Harry Potter as queer, but Dumbledore and Grindelwald are the key confirmed figures.
Credence Barebone, born as Aurelius Dumbledore around 1900, was a mixed-blood American wizard, the biological son of Aberforth Dumbledore and the adopted son of Mary Lou Barebone, leader of an anti- witchcraft No-Maj group.
If there's one house that's truly the least recognized, it must be Ravenclaw. This house is so unrecognized the movies even got its house colours and symbol wrong.
George's twin brother, Fred Weasley, was killed when the Death Eaters attacked Hogwarts Castle, so George's life was likely significantly different after Voldemort's defeat. The two were hardly seen without the other before, and neither the books nor movies talk much of how George handled losing his partner in crime.
The saddest scene in the Harry Potter series is the tragic death of Dobby, Sirius Black, Fred Weasley, Remus Lupin, and Nymphadora Tonks in the middle of the Battle of Hogwarts.
Although Crouch eventually escaped, he was murdered by his own son when he attempted to warn Harry Potter and Albus Dumbledore of what had happened.