Well, a possible plotline is that Snape travels back to his school days and tries to change how he was bullied. He could use his more advanced magical knowledge from the future to outwit his bullies. He might also take steps to befriend the Marauders in a different way, perhaps by sharing some of his future insights on dark magic threats, which could lead to a whole new alliance and change the course of events at Hogwarts.
One interesting plotline could be Snape going back in time 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. Another could be him attempting to correct his own past mistakes, like his relationship with James Potter. Maybe he goes back and tries to befriend James earlier to avoid all the enmity that grew between them over the years.
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.
In some fanfictions, Naruto might go back in time and try to save his parents. He could alter the events that led to their deaths. This would not only change his own life but also have a huge impact on the entire ninja world as his parents were very powerful ninja.
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.
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.
Dumbledore is also a character often paired with Snape in such fanfictions. Snape's loyalty to Dumbledore in the original story is complex. When he travels back, their relationship could be rewritten. Snape might confide in Dumbledore about his time - traveling experiences and they could work together more closely to prevent future disasters. Additionally, James Potter could be paired with Snape in a sense that Snape tries to change their relationship dynamic by going back in time, either to befriend him or to avoid the conflicts they had in the past.
Another plotline might involve Snape discovering Hermione's use of the Time - Turner and initially being suspicious of her motives. But as they interact more in the altered timeline, they end up forming an unlikely alliance. They could work together to uncover a long - buried secret about Hogwarts that was lost in time.
Well, a cool plotline might involve the main character introducing modern ideas to the Marauders' time. Maybe they bring new spells or ways of thinking that completely change the dynamic at Hogwarts. It could be really exciting to see how the Marauders and their friends react to these new concepts.
One interesting plotline could be Naruto using his knowledge of the future to prevent certain tragedies that occurred during the war. For example, he might be able to save some of the fallen comrades. Another could be his attempts to change the political situation in the ninja world for the better, leveraging his experiences.
One interesting Snape back in time fanfiction is 'Snape's Time - Turned Adventure'. In this story, Snape goes back to his Hogwarts days with new knowledge and tries to change some of the events that led to his difficult life. Another is 'Back to the Past: Snape's Redemption' where he has the chance to right the wrongs he did in the past, especially regarding his relationship with Lily.
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.