At the core, Harry's reasons for not wanting to be in Slytherin were due to all the negative stories he had heard from
The Sorting Hat debated between placing Harry Potter in Slytherin or Gryffindor, believing that his personality traits made him better off in the former. Harry, rather strongly, made his preference for Gryffindor clear, and the hat ultimately chose the latter.
Harry would have been internally conflicted if he had been Sorted into Slytherin. Although he still would have felt that Hogwarts was the only place he had ever belonged, he might have felt wary forming relationships with the children of Death Eaters.
The only reason Hermione wasn't put in Slytherin is because she's muggleborn. Way to perpetuate Slytherin's elitist mentality, Sorting Hat… A singular trait isn't enough to place you in a house, no matter how dominant it is. Hermione is intelligent, but that doesn't automatically mean she's a Ravenclaw.
One of the main reasons Dumbledore belongs in Gryffindor and not Slytherin is because he is willing to sacrifice himself for others. Dumbledore fatally injured himself hunting down Horcruxes and even this did not deter him from his fight against Voldemort.
He is cunning
Slytherins are a cunning lot, and there are all kinds of examples of Albus Potter using his wiles to come up with schemes and plans worthy of any member of Salazar's house throughout Harry Potter and the Cursed Child.
Peter Pettigrew. Peter Pettigrew, (a.k.a. Wormtail), is the only Death Eater known to have been in a House other than Slytherin (Gryffindor) while at Hogwarts.
Ron Weasley
Being Harry Potter's best friend certainly needed heaps of bravery – hence the Sorting Hat not messing around in sorting Ron into Gryffindor, the house of his parents, brothers and sister. But the Hat specifically states that Gryffindors usually have 'daring, nerve and chivalry'.
And this is why Hermione does not fit into Ravenclaw, since she lacks their creativity of thought. When you also add in her fearlessness and her strong convictions about right and wrong, which are inherently Gryffindor traits, then there was even less of a chance she'd end up wearing blue and bronze.
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.
Hufflepuffs are the only ones patient enough to really get to know someone without any judgment. Since Slytherins are often on edge, they truly appreciate the safe space that Hufflepuffs create. They ground Slytherins and keep their heads in the right place.
A Professor at Hogwarts School of Witchcraft and Wizardry, Snape is hostile to Harry due to his resemblance to his father James Potter, who bullied Snape during their time together at Hogwarts.
Severus Snape, Horace Slughorn, Andromeda Tonks, Narcissa Malfoy and Regulus Black were all Slytherin heroes in their own way, if you think about it. And Merlin – as in, yes, King Arthur's advisor and the most famous wizard in history – was a Slytherin.
Due to his humiliation in the Triwizard Tournament, Cedric eventually becomes a Death Eater and kills Neville Longbottom. Due to Neville's death, the final Horcrux Nagini was never destroyed, and as a result Voldemort is never defeated, kills Harry and takes over the Wizarding World.
The Sorting Hat was picking up on the Dark Lord's soul in Harry. It's hinted that the reason that the Sorting Hat was considering putting Harry in Slytherin was because of the piece of Lord Voldemort left inside of him.
No, the Sorting Hat doesn't sort too early. First things first, there have been a couple of occasions when the Sorting Hat has possibly made a mistake. The most obvious example would be Peter Pettigrew – who rather than demonstrating courage and chivalry, was weak with a real knack for self-preservation.
Albus ended up in Slytherin because he couldn't stop thinking about ending up in Slytherin, and so the Sorting Hat couldn't grasp anything other than his thoughts about being in Slytherin.
“I wrote the Hermione/Ron relationship as a form of wish fulfillment. That's how it was conceived, really,” Rowling says in the interview. “For reasons that have very little to do with literature and far more to do with me clinging to the plot as I first imagined it, Hermione ended up with Ron.”
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.
The only quality she shares with Salazar Slytherin is being a dark wizard. Bellatrix actually belongs in Hufflepuff. She is fiercely loyal to Voldemort, standing by his side the entire time. She also waited for his return while stuck in Azkaban with the patience only a Hufflepuff could have.
She is perceptive
Ravenclaws are perceptive, and Luna noticed all kinds of things others didn't during her time at Hogwarts. There was that time she explained Ron in one sentence: 'He says very funny things sometimes, doesn't he?
Slytherin house has some trouble with shaking its murky reputation – and it's all thanks to a certain few witches and wizards like Lucius Malfoy. Today we look at the reasons why he embodied all the worst Slytherin traits and gave his house a bad name… Lucius Malfoy was an odious character.
Hufflepuff has produced the least amount of Dark wizards
'They didn't want to show off, they weren't being reckless, that's the essence of Hufflepuff. ' In fact, the most evil deed we can remember a Hufflepuff ever doing was Ernie Macmillan wearing a 'Potter Stinks' badge.