There could also be a plot where Hermione discovers a long - lost Slytherin secret. It might be a powerful spell or a hidden chamber that only a Slytherin with her unique combination of knowledge and determination can unlock. This discovery then changes the way Slytherin is perceived in the wizarding community.
One interesting plot could be Harry having to deal with the Slytherin's traditional pure - blood supremacist views while trying to stay true to his own values. He might face challenges from some of his Slytherin housemates who initially look down on him for his 'half - blood' status.
Another plot could be Hermione trying to reform the Slytherin House from within. She might introduce new study groups or a more inclusive attitude towards non - pure - blood students. This would likely face a lot of resistance from some of the more traditional Slytherin families, but Hermione, with her determination, could start to make small but significant changes.
One interesting plot could be Hermione going back in time and preventing certain tragedies from the original story. For example, she might stop the death of a beloved character. Another could be her using her modern - day knowledge to change the course of wizarding history, like introducing new spells or concepts earlier.
One interesting plot is where Hermione uses her new position in Slytherin to reform the house from within. She starts by challenging the more discriminatory and dark - sided traditions. She teams up with some of the more open - minded Slytherins to change the house's image. Another plot could be that she discovers a hidden part of Slytherin's history that has been suppressed, and she uses her intelligence to bring it to light, which causes a stir both within Slytherin and across the whole Hogwarts. There's also the plot where Hermione's sorting into Slytherin makes her a target for some of the more malicious Slytherins at first, but she gradually wins them over with her knowledge and determination.
Hermione may become more cunning. In Slytherin, she has to adapt to the house's traits. So she might start using her intelligence in more devious ways, like setting up elaborate traps for those who try to bully her, but still within the bounds of good. For example, magically rigging a classroom so that when a bully tries to embarrass her, they end up getting a face full of slime.
Another plot could involve Harry discovering some long - lost Slytherin secrets. Maybe there are hidden chambers or spells that only Slytherin students are supposed to know about. Harry, being the curious and brave character he is, delves into these secrets. This could put him in a dangerous position as some Slytherins might not want him to expose or use these secrets, but it also gives him a chance to prove himself to his new housemates.
A plot could involve Slytherin Hermione and Harry being paired for a long - term project by a teacher who wants to encourage inter - house cooperation. At first, they struggle because of their different house values, but gradually they find common ground. For example, Hermione's Slytherin cunning helps them outwit some bullies who are trying to steal their project ideas, and Harry's Gryffindor courage gives Hermione the push she needs to stand up to some of the more elitist Slytherins who look down on her for her non - pure - blood status. Or perhaps they discover a hidden prophecy that only they can understand together, and it has something to do with a new threat to Hogwarts that combines elements of both Slytherin's ambition and Gryffindor's heroism.
One idea could be Hermione using her intelligence to change the Slytherin house's reputation from within. She could start study groups that include students from all houses, gradually breaking down the traditional rivalries. Another plot could involve her befriending some of the more misunderstood Slytherin students and together they work on a secret project that benefits the whole school.
A possible plot is that Draco, who is in Slytherin, discovers a hidden secret about Hermione's family that has ties to Slytherin. This makes him see her in a new light and they start to form an unlikely alliance. They could then face challenges from their respective houses. Another plot idea is that in an alternate universe, Hermione is sorted into Slytherin and she and Draco become friends and then something more, as they strive to change the negative perception of Slytherin from within.
One interesting plot twist could be that Hermione, as a Gryffindor in the original series, starts to question the values of her own house because of her newfound admiration for Slytherin. Maybe she discovers a long - lost family connection to a Slytherin family, which makes her more empathetic towards their ways. Another could be that she uses Slytherin - like cunning to solve a problem that Gryffindor bravado couldn't handle, causing a rift between her and some of her Gryffindor friends.