Lord Voldemort (Tom Riddle): Tom Riddle took the core qualities of Slytherin to new heights, as he became arguably the most powerful dark wizard of all time. He learned how to split his soul and create numerous Horcruxes, thereby making himself immortal as long as the Horcruxes existed.
Worst: Lucius Malfoy
Lucius Malfoy is pretty clearly a bad person, but he's a perfect example of how banal cruelty and evilness can be. Lucius likes to control, humiliate, and cause people pain, but he's also too weak and self-absorbed to really become one of the evil "greats," so to speak.
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.
Scarlett Hannah Hefner (née Byrne; born 6 October 1990) is an English actress. She is best known for her roles as Slytherin student Pansy Parkinson in the Harry Potter series, and as Nora Hildegard in The Vampire Diaries.
Slytherins and Hufflepuffs share a bond that is nothing short of being platonic soulmates. 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.
The Head of Slytherin is Horace Slughorn (who left the role to Severus Snape for fifteen years before taking it up again in 1996) and the House's patron ghost is the Bloody Baron.
Ravenclaw. Known for their wisdom, wit, and creative intelligence for solving problems, students of Ravenclaw are often assumed to be the smartest of their peers.
Slytherin: Cancer, Scorpio, and Pisces
This house is stereotypically the house where all the villains of the wizarding world originate (sorry, water signs), but IMO, they're also the most misunderstood, which is also true of water signs (particularly Pisces).
If there's anything a Slytherin loves, it's a loyal follower, and a Hufflepuff embodies this to a tee. Want a partner you can rely on, especially if things turn dark? Only a Hufflepuff will endeavour to see the good through the bad, no matter what. Lastly, we have Slytherin partnerships with Gryffindors.
Slytherins are hardworking and desire success. They are known to achieve great things (even if not always good things). They are the kind of people who make you want to be better just by being around them. They are determined and resourceful.
Hufflepuff is stereotyped as a house for pushovers and Ravenclaw for bookworms. Finally, Slytherin is thought of as the 'evil' house. These stereotypes are found all throughout Harry Potter, with Harry himself refusing to be sorted into Slytherin and Draco Malfoy saying he'd leave if he were sorted into Hufflepuff.
Slytherins have a fear of failure since their cunning mentalities encourage them to be perfect at all times. Repeated failures are what people of the house are really afraid of, though, because it opens up the possibility for them to consider that they might be weak in some way.
Unfortunately, Slytherin has constantly been associated with evil witches and wizards. Most of this negativity surrounding Slytherin came because of the rise of Lord Voldemort and his followers, the Death Eaters.
Horace Slughorn (1997 - present) Horace, after being convinced by Dumbledore and Harry Potter, returned to Hogwarts as the Potions master. After Severus killed Dumbledore and became headmaster of Hogwarts, it was decided that Horace was to become the Head of Slytherin House once again.
Though these characters do share the extreme views Slytherins are known for, they also have traits other than just being evil. They are flawed, but they also chose to make a stand against Voldemort despite initially choosing to side with him. They choose to be more than evil.
Merlin himself was sorted into Slytherin when he was at Hogwarts, and the young wizard went on to become one of the most famous wizards in history.
Harry Potter came very close to being sorted into Slytherin before he persuaded the Hat to sort him into Gryffindor.
Hufflepuff values kindness and hard work, Gryffindor values bravery and boldness, Slytherin values ambition and cunning, and Ravenclaw values wit and wisdom. So it's no big surprise that Ravenclaw house has the reputation of being the smartest house in the world of Harry Potter.
Hufflepuffs. Hufflepuffs are the opposite of Slytherins because they are eager to build a consensus that everyone can live with.
Slytherin is also the best house due to their house quality: ambition. With this trait, Slytherin people make sure that they stay alive unlike their counterparts in Gryffindor. Gryffindor's characteristic is bravery. Bravery might not seem terrible, but it is possible to be too brave (which countless Gryffindors are).
ENEMIES. Slytherins and Ravenclaws - Slytherins hate rules and Ravenclaws are ingenious. Together they can take over the world or create amazing spells. Or they can hate eachother with a fury and rage.