It’s not secret to anyone who knows me that I am a Slytherin. Every test I have ever taken, in regards to sorting me into a Hogwarts house, has come back with an overwhelming response that I am indeed a Slytherin.
So you can imagine my disappointment when J.K. Rowling portrayed the noble house of Slytherin as a bunch of mean spirited, opportunistic, evil group of individuals. Now I know the story of Harry Potter is told through the perspective of Harry Potter, and his limited interactions with members of the Slytherin house was not very favorable. But can we take a moment and remember that Remus, Sirius, James, and Lupin, all Gryffindors, treated Severus in ways very similar to how Malfoy treats Harry. So being sorted into Slytherin does not mean you are an automatic asshole.
I remember reading the final book, during the battle of Hogwarts, and hoping that at some point the students of house Slytherin would break out of the dungeon, and come to their schools aid. That Rowling would show the world that Slytherins took pride not only in themselves, and their house, but also their school, and the students studying with them.
Sadly it never happened.
But I have always had a certain headcanon within my own brain that the houses of Hogwarts were not nearly as divided as Rowling suggests they are. While each house certainly has qualities that make each house unique, these qualities, when combined, can form a wonderful alliance.
Imagine if you will a group of Slytherin students sitting in protest outside the Slytherin House common room. The password for the door is derogatory, or somehow bigoted and so, in defiance, the students refuse to say it.
Days go by, and the numbers of students sleeping and camping outside the Slytherin common room grows, that is until the Hufflepuffs find out, and invite the Slytherin students to a sleepover in their common room. The Slytherins, tired of sleeping on the cold stone floor, graciously accept, and the next few days are spent in friendship and comradery.
That is until the Ravenclaws find out. The students of house Ravenclaw are so touched by the willpower of the Slytherins that they go to work on the Slytherin common room door. They study, and use every spell they know to magically change the password to something less offensive and vulgar. It becomes an all out offensive as Ravenclaw after Ravenclaw try their knowledge and experience out, in an effort to help the Slytherin brothers and sisters.
Weeks have passed by this point, and the Hufflepuffs and Slytherins are living in perfect harmony, and even the Ravenclaws are starting to mingle in and out of the Hufflepuff common room. There is tea for everyone, intriguing stories, and fierce competitions and magical duels all ending in laughter and a closer bond of friendship.
Well, you can imagine it doesn’t take long for the Gryffindors to find out what’s going on, and they want in on the action as well. The Ravenclaws are at a loss at this point, having tried every magical spell they could find, study, or research. So the Gryffindors devise a plan to forcibly remove the door. I can just imagine the Gryffindor Head Boy telling everyone “Stand back everyone! The plan is to either jinx the door, or failing that, we are just going to blow it up!”
The Hufflepuffs of course provided the Gryffindors with the explosives, which caused some confusion, but also was not questioned. However it did coin the phrase “Never mess with a Puffball, for they are cute, and will blow you up!”
While the Gryffindors set the explosives, the Hufflepuffs are providing everyone with tea and cookies. The Slytherins and Ravenclaws are observing, from a distance, as they work together to write a very strongly worded letter to the Headmaster about this situation.
Finally, around 2AM, the Gryffindors bring the Slytherin house common room door down with a bang.
This starts a new tradition at Hogwarts, from then on. Each month the houses gather together to solve a mutual problem. Sleepovers become a regular thing, not just between Hufflepuff and Slytherin, but all the houses, and most importantly everyone gets along, sees the qualities and values of each house, and friendships amongst the different houses grows to a all time high.