Well, in such a fanfic, a possible plot development is that Harry and Snape end up changing the course of Severus's relationship with Lily. Since Harry knows how important Lily was to Snape, he could try to make sure that Snape doesn't lose her friendship. They could also collaborate to expose some of the Death Eaters' early plans, which would be a huge shift in the timeline. Plus, Harry might be able to convince Snape to be more open - minded about Gryffindors, as he sees a different side of Harry compared to the typical Gryffindor stereotype.
In this fanfic, perhaps Harry and Snape start to study magic in a different way. Harry, with his future knowledge, could introduce Snape to some spells or magical concepts that were not well - known at that time. This could lead to Snape becoming even more powerful and respected earlier. Also, their friendship might cause a rift within the Slytherin house. Some Slytherins might not approve of Snape being friends with a 'time - traveling' Gryffindor. This could lead to interesting power struggles and alliances within the house.
One interesting plot could be that Harry uses his knowledge of the future to help Snape avoid some of the bullying he endured. For example, he might warn Snape about certain Slytherins who would target him. Another could be that they work together to change some small events that have a big impact on the overall wizarding world's future. Harry might also introduce Snape to some of his future friends in a different context, like showing Hermione's intelligence to Snape much earlier.
It would definitely shake things up. The Gryffindors and Slytherins have a long - standing rivalry. With Harry, a well - known Gryffindor, befriending Snape, a Slytherin, it could start to break down some of those barriers. Students might be more open to interacting with those from different houses.
One common plot development could be that Harry tries to prevent the events that led to his death in the first place. For example, he might focus on changing how he dealt with Voldemort. Another could be that he uses his knowledge of the future to form different relationships. He may be more cautious with some people and more open with others. He could also try to save the lives of those who died before, like Sirius or Dumbledore.
One interesting plot could be Snape going back and trying to prevent the death of Lily. He might use his knowledge of the future to change certain events that led to her demise. Maybe he would try to expose Pettigrew earlier or find a way to make James Potter more cautious.
One possible plot twist could be that when Harry goes back, he discovers that Snape's situation is far more complex than he initially thought. Maybe Snape was involved in some secret mission that put him in danger, and Harry's interference actually endangers the entire wizarding world in unexpected ways. For example, Snape might be on the verge of uncovering a new dark magic plot that Harry's presence disrupts.
One possible plot twist could be that Snape, in his attempt to save Harry, accidentally changes the entire future of the wizarding world. For example, he might prevent Voldemort from ever rising to power in the first place, which would mean that all the relationships and events that we know from the original story would be completely different. Another plot twist could be that Snape discovers that saving Harry is not as straightforward as he thought. Maybe there are dark forces at work that are trying to stop him from changing the past, and he has to fight against them while also trying to protect Harry.
Well, perhaps in the fanfiction, when they go back in time, Harry and Daphne end up changing the Hogwarts houses. Since they know different things about the students, they might influence the sorting hat. This could lead to new friendships and rivalries, completely altering the social dynamics at Hogwarts.
Well, one possible plot development could be Ruby using her knowledge of future events to prevent certain tragedies. For example, she might stop the fall of Beacon earlier than it originally happened. Another could be her trying to change the relationships between the characters for the better. Maybe she'd make sure Weiss and Blake become friends more quickly. Also, she could work on improving her own skills faster by learning from her past mistakes.
Another plot could be that Hermione goes back in time and ends up changing the relationships between the main characters. Maybe she accidentally causes a rift between Harry and Ron, and then has to figure out how to fix it while also dealing with the overarching threat of Voldemort in that time period.
One interesting plotline could be Snape going back and trying to prevent the death of Lily Potter. He might use his knowledge of the future to change certain events that led to her demise.
One idea could be that Harry goes back in time to prevent certain dark magic spells from being created. He might try to stop Voldemort's rise before it even starts by influencing the earlier events related to the Dark Lord. Another plot could be Harry going back and changing the way he interacted with certain characters like Snape, which could lead to a completely different relationship dynamic. Maybe he could also go back to save some characters who died in the original timeline, like Sirius Black.