Well, in fanfictions where Snape is sorted into Gryffindor, his whole life at Hogwarts would be transformed. He would be in a different dormitory, surrounded by different classmates. His values would probably be challenged more often, as Gryffindor values bravery in a more upfront way compared to Slytherin. This could lead to him either growing into a more confident and bold character, or struggling to fit in and constantly feeling like an outsider in a different way than he did in Slytherin. His relationship with Dumbledore could also start off on a different foot, as Gryffindors are often seen as more trustworthy in Dumbledore's eyes at first glance.
In fanfiction, if Snape was sorted into Gryffindor, he might have had a very different relationship with the Marauders. Instead of being their rival from Slytherin, he could have been a part of their group. He may have been more open about his emotions and not as bitter as he was in the original story. His relationship with Lily might also have developed in a more positive way without the house rivalry constantly straining their friendship.
Snape's character would become less brooding. In Gryffindor, he'd be surrounded by a more positive and open - minded group. This could soften his edges. He might be more likely to show his true feelings instead of hiding them behind a mask of coldness.
Well, at first Harry would be very suspicious of Draco. But as Draco shows his Gryffindor side, Harry might start to trust him more. They could become reluctant allies, especially when facing a common enemy.
In some fanfictions, if Harry is kicked out of Gryffindor, he might end up joining another house like Hufflepuff. The Hufflepuffs are known for their acceptance and might welcome Harry with open arms. This could lead to a whole new set of adventures for Harry, as he would have to adjust to the different values and culture of Hufflepuff house.
Well, he might face a lot of challenges. In Slytherin, he'd be surrounded by students with different values compared to Gryffindor. He could have a tough time making true friends at first. But it might also give him a chance to change the perception of Slytherin from within. He could use his Gryffindor courage to influence the more cunning and ambitious Slytherins towards a more positive path.
Another plot could be that Draco's sorting into Gryffindor causes a rift in his family. His parents are disappointed, but Draco finds a new family among his Gryffindor housemates. He could also have a love interest in a Gryffindor girl, and they have to overcome the house rivalries to be together. The story could explore how Draco changes and grows in this new environment.
If Hermione was sorted into Slytherin, she'd bring a whole new dynamic to the house. Slytherin is known for its ambition and resourcefulness, and Hermione has those traits in spades. She might change the perception of what it means to be a Slytherin. Instead of just being about pure - blood supremacy and cunning for the sake of it, she could introduce a more ethical form of ambition. Her study habits would probably influence some of the other Slytherins to be more studious. And she'd also have to navigate the politics within Slytherin, which could be a real challenge as she's used to the more straightforward environment in Gryffindor.
Well, the theme of identity is quite common. Snape is a Slytherin but in these fanfictions set in Gryffindor - related scenarios, his identity is often questioned and reshaped. Also, the theme of forgiveness. Gryffindor characters might be more likely to forgive Snape's past actions compared to others, and this exploration is often seen. And there's the theme of acceptance. How Snape is accepted or not by the Gryffindor community, and how he himself accepts or resists the Gryffindor ideals.
If Harry gets sorted into Ravenclaw in fanfic, he would likely face a whole new set of challenges. He'd have to adapt to the Ravenclaw house values which are different from Gryffindor's. His relationship with Hermione could be interesting as they'd both be in different houses yet share a love for knowledge. He might be more isolated from Ron at first, but this could lead to new character growth as he makes friends within Ravenclaw.
If Harry was kicked out of Gryffindor in Ginny - related fanfiction, Ginny would likely be one of the first to oppose the decision. She might secretly help Harry by providing him with a place to stay in Gryffindor's common room undetected. And she could start her own investigation into what really happened, suspecting foul play. After all, Harry has been a hero in Gryffindor and Ginny wouldn't let him be cast out so easily.
In a fanfiction where Snape meets the Avengers, it might start with a lot of confusion. Snape is from a world of magic and the Avengers are from a world of superpowers. Snape could use his potions skills to create something that might give the Avengers an edge in a battle. For example, a potion that could temporarily enhance their powers. However, his sarcastic and often untrusting attitude might make it difficult for him to fully integrate with the team at first.