What are some interesting plotlines in 'Harry and Severus go back in time' fanfiction?

In some fanfiction, the Avengers could go back in time to change a small event that had a huge butterfly effect on the future. For instance, they might go back to when Loki first arrived on Earth and try to make him an ally instead of an enemy. This would require them to convince Loki, who is very distrustful, and also deal with the potential consequences of altering his path in the timeline.

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.

They might go back in time and accidentally change something that has a huge ripple effect on the future. So then they have to scramble to fix it before they return to their own time. They could also go back in time to learn some long - lost magic from an ancient wizard or witch and bring that knowledge back to their time to defeat a new dark force.

Another plotline could be Albus Severus trying to correct a mistake made by one of his ancestors. This might involve him interfering with a family feud or an old magical spell gone wrong. As he travels through time, he has to be careful not to disrupt the fabric of time too much, which adds an element of danger and suspense to the story.

One interesting plotline could be Harry going back in time to prevent certain deaths, like Sirius Black's. He might use his knowledge of future events to change the course of history and save his loved ones.

One interesting plotline could be Severus having to take care of a deaged Harry. He might struggle with his initial dislike for Harry but gradually grow to understand him better in this new situation. For example, he could teach the young Harry some basic potions skills, which would be a unique bonding experience.

In some fanfictions, there might be a plot where Harry discovers he has a long - lost family connection to Severus. For example, perhaps they are distantly related through some ancient wizarding bloodline. This discovery could lead to a whole new dynamic between them, with Harry seeing Severus in a different light and Severus feeling a sense of obligation towards Harry.

One interesting plotline could be Harry using his future knowledge to prevent certain tragedies. For example, he might stop the death of his parents earlier, which would completely change the course of the wizarding world. He could also use his knowledge of dark magic threats to better prepare the wizarding community, like warning about Voldemort's rise much earlier.

Well, in some 'Harry Potter goes back in time' fanfics, Harry might go back to his first year at Hogwarts. He could then use his more advanced magical skills (from his future experiences) to solve the mystery of the Philosopher's Stone in a completely different way. This might involve him befriending different people earlier or even changing the course of how the challenges in the dungeon were set up.

Another plotline could involve Severus struggling with his own emotions towards Harry. On one hand, he has his long - held grudges against James Potter, Harry's father. But on the other hand, he has a sense of duty to protect Harry. This internal conflict could drive many of the story's developments, like how he interacts with Harry on a daily basis, whether he is strict or lenient, and how he deals with Harry's questions about his parents.