In some 'Harry joins Slytherin fanfiction', a great plot twist is that Voldemort has a different reaction to Harry being in Slytherin. Instead of seeing him as an immediate threat, he tries to recruit Harry more subtly, believing that with his Slytherin upbringing, Harry could be turned to his side. This creates a complex situation for Harry as he has to navigate between the expectations of his new house, his loyalty to Dumbledore, and the threat of Voldemort.
One interesting plot twist could be that Harry, in joining Slytherin, discovers a long - hidden family connection to one of the prominent Slytherin families. This changes his perception of his own identity and makes him question his place in the wizarding world.
A possible plot twist is that Harry's presence in Slytherin completely alters the house dynamics. He manages to influence the Slytherins to be more inclusive and cooperative with the other houses, which goes against the traditional Slytherin stereotype. For example, he might encourage them to participate in joint projects with Gryffindors, Hufflepuffs and Ravenclaws, leading to a more united Hogwarts.
In some fanfictions, a great plot twist is that the 'Prince of Slytherin' is not who everyone thinks he is. He might be under a powerful charm or disguise. And when the real identity is revealed, it turns out to be someone who has been working undercover for Dumbledore all along, which shocks both the characters in the story and the readers.
One interesting plot twist could be that Harry, being in Slytherin, forms an unexpected alliance with Draco Malfoy. Instead of the typical rivalry, they team up to uncover a dark secret within the Slytherin house that threatens the whole school. This changes the dynamic of the story as they have to work together despite their differences.
One interesting plot twist could be that Harry uses his Slytherin cunning to reform the house's negative image. He might convince his housemates to abandon pure - blood supremacist ideas and focus on academic and magical achievements instead.
Perhaps a major plot twist is that the 'Prince of Slytherin' has a secret connection to Harry Potter. For example, they could be long - lost relatives. This would completely change the dynamic between Harry and the Slytherin character and lead to unexpected alliances and conflicts in the fanfic.
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.
In this fanfiction, a great plot twist could be that the Slytherin character has a hidden identity as a member of an ancient magic - protecting group. The betrothal to Harry is part of a bigger plan to unite the houses against a new, emerging dark force. As they come together, they face a lot of opposition from both sides, Gryffindor and Slytherin, but through their relationship, they start to bridge the gap between the two houses.
Well, a really interesting plot twist could be Hermione's role in the Slytherin house. She could become a leader, using her intelligence to reform the house's more negative aspects. Or, she might be caught in the middle of a power struggle between different Slytherin factions. Also, her interactions with the Slytherin pure - blood families could be full of drama. Maybe she discovers a family secret that could change the whole wizarding world.
In some of these fanfictions, a great plot twist is when Hermione's switch to Slytherin causes a rift among her old Gryffindor friends. However, this rift actually leads to a deeper understanding between the houses in the long run. She might also start to question the values she was taught in Gryffindor and find that Slytherin has some values, like ambition in a positive sense, that she can really embrace. And there could be a plot where she has to use her new - found Slytherin knowledge to save Hogwarts from a threat that Gryffindor - centered magic couldn't handle.
One plot twist could be that there's a prophecy about a Slytherin and a Gryffindor uniting the wizarding world, which is revealed to be about Harry and Ginny. This forces them to deal with a lot of attention and expectations from the wizarding community. It also makes their relationship a focal point of a much bigger plot, with dark forces trying to stop them from fulfilling the prophecy.
One interesting plot twist could be Naruto having to hide his Slytherin heritage within the Hidden Leaf Village. Since the values of Slytherin, like cunning and ambition, might be seen as foreign or even negative in the ninja world. Another could be Naruto using Slytherin - like strategies to outwit his opponents during the Chunin Exams. For example, instead of his usual straightforward attacks, he uses more devious and planned out maneuvers. And a third one might be the discovery of a connection between the Slytherin magic and some long - lost ninja techniques, which Naruto then has to master to save the village from a new threat.