Maybe because some fans want to explore a different side of Harry. By making him the 'king' of Slytherin, they can show how his character could adapt and thrive in a different house's environment.
Obviously, Harry Potter himself is crucial. Then there would be the other Slytherin students like Draco Malfoy. Their relationship could be very different in this fanfiction. Maybe they become allies instead of rivals. There could also be the Slytherin professors who play important roles in guiding Harry as the new 'king' of the house.
It could mean that in certain fan - created stories (fanfiction), Harry Potter is depicted as a dominant or important figure within Slytherin. Maybe in these fictions, he has extraordinary power or influence within the Slytherin house, which is quite different from his traditional Gryffindor identity in the original series.
Obviously, Harry Potter himself as the Ice King. Then there would be Draco Malfoy. He could be either a rival or an ally to Harry in this new role. Hermione would also be there, trying to understand the magic behind Harry's transformation and helping him control his powers. And of course, Snape, who might have some knowledge about the Slytherin magic related to the Ice King.
Well, a great plotline might be Harry delving into the history of Slytherin. He could discover secrets about the founder that give him an edge in leading the house. For example, he might find hidden chambers or spells that only the true heir of Slytherin should know. This could lead to him using this knowledge to protect Slytherin students from discrimination and also to gain respect within the wizarding world as a Slytherin leader.
One great Slytherin - centered fanfiction is 'The Slytherin Heir'. It delves into the life of a Slytherin student who discovers a hidden secret about their family's connection to the Slytherin legacy. The story is filled with complex characters and a plot that keeps you guessing.
Maybe it's a new Slytherin character created specifically for the fanfiction. This character could be someone who has always admired Harry from afar and decides to take a chance on courting him. They might have different qualities from the typical Slytherins we know in the original books, being more open - minded and brave in their pursuit of Harry.
The plot might involve Harry being magically transformed into the Ice King of Slytherin against his will. He struggles to control his new powers which are linked to ice and cold. In Slytherin, he has to face the prejudices of his housemates who initially don't trust him with this newfound power. But as he learns to master it, he uses it to protect Slytherin and Hogwarts from a common enemy.
Yes, in certain fanfiction. This concept allows for a really interesting exploration of the Harry Potter universe. By making Harry the true heir of Slytherin, it can add a whole new layer of complexity to his character. He could inherit Slytherin - like traits such as cunning and ambition, which would contrast with his Gryffindor - associated qualities like bravery, leading to some great internal and external conflicts in the story.
In some fanfictions, yes. Writers like to play with the idea of subverting the original story. They might create a scenario where Harry discovers he has some hidden connection to Slytherin. It could be through some convoluted family history or a magical revelation.