A really cool plot would be Scorpius time - traveling to the time when Hogwarts was first founded. He could witness the creation of the four houses and the early magic that was used to build the school. He might even get involved in some sort of power struggle between the founders. And his actions in the past could lead to changes in the way magic is taught at Hogwarts in his own time.
Perhaps Scorpius travels back to the Triwizard Tournament era. He gets involved in the events and tries to use his knowledge from the future to stop Cedric Diggory's death. He might also find himself in the middle of the mystery surrounding Harry Potter's name being entered into the Goblet of Fire and end up uncovering secrets that were long buried. And he could form an unlikely friendship with a young Hermione Granger.
One idea could be a story where Scorpius discovers a long - hidden family secret that Draco has been trying to protect him from. It could involve some dark magic from their family's past.
One idea could be that they travel back to the time of the founders of Hogwarts. They might accidentally change something small that has a huge impact on the present day. For example, they could prevent one of the founders from making a key decision about the sorting hat, which then changes the way students are sorted in their time.
Rose Granger - Weasley could also be a sidekick. She is intelligent like her mother Hermione. In a time - travel scenario, say when they go back to the Goblet of Fire times, she could use her smarts to figure out the complex magical rules and traps. Scorpius, with his knowledge of how things are supposed to turn out, could work with her to change the outcome for the better, like preventing some of the more dangerous tasks from being so deadly.
Perhaps Scorpius has a rare magical illness that only Hermione, with her extensive knowledge and unique approach, can attempt to cure. As she delves deeper into finding a cure, they discover they have more in common than they thought. They might also face opposition from the wizarding community due to their different backgrounds, but their relationship grows stronger in the face of it.
Another idea is that Draco travels back to the time of the founders of Hogwarts. He could interact with them and gain a new perspective on magic and the wizarding world. Maybe he would learn some ancient spells that were lost over time and use this knowledge to his advantage when he returns to his own time.
One idea could be exploring the relationship between Draco Malfoy and his parents in a more in - depth way. Maybe showing how they influenced his actions during his time at Hogwarts. Another could be a prequel - type story about how the Malfoy family came to be so wealthy and powerful in the wizarding world. And a third could be a story where a Malfoy family member has to choose between loyalty to their family's dark past and a new path of light.
In some narusasu time travel fanfiction, Naruto might go back to the time when Orochimaru was first targeting Sasuke. He could then use his skills and knowledge to keep Sasuke safe and away from Orochimaru's influence. A different plot could be Sasuke traveling to a time when Naruto was ostracized as a child and being the one to support Naruto, which would change their relationship dynamic from the start. Also, they could travel to a time during a major battle and use their combined future knowledge to turn the tides in their favor.
One idea could be Madara traveling back to the era of the Sage of Six Paths. He could try to change the very foundation of ninjutsu, which would create a whole new timeline. Maybe he would attempt to gain the power of the Sage for himself much earlier in history.
One plot idea could be Naruino traveling back in time to prevent a great disaster in their world. Maybe a powerful enemy once defeated them in the past, and by going back, they can change the outcome. Another could be traveling to the future to see how their actions in the present have affected the world. For example, they might find that their current choices led to a utopia or a dystopia.
One plot idea could be Arya traveling back in time to the days before her family's downfall. She could use her knowledge and skills to prevent certain events from happening. For example, she might stop Ned Stark from making some of the political missteps that led to his execution. Another idea is Arya traveling to the future of Westeros. She could see the long - term consequences of the power struggles she was part of and try to change things in her own time. Maybe she'd witness a new dynasty rising or a great war that she could try to avert.