Some fanfictions might have a plot where characters who died in the original series are brought back and given a second chance at life. For instance, Sirius Black could return and this time, he and Harry could have a proper relationship, with Sirius being able to guide Harry more effectively. There could also be a plot where the magical world as a whole is given a second chance after the destruction caused by Voldemort. New laws and systems are created to prevent such a dark wizard from rising again.
One interesting plotline could be a character who made a big mistake in the original series getting a second chance to rectify it. For example, a Death Eater might be given a chance to turn good and fight against Voldemort. Another could be a character like Neville having a second chance to prove his worth even more spectacularly, perhaps by being the one to finally defeat Voldemort. Or it could be about Harry having a second chance to save someone he couldn't save before, like Sirius, which would lead to a whole new set of adventures and challenges.
One interesting plot could be a character from the original series getting a chance to redo a crucial moment in their life in this Second Life. For example, Harry might have the opportunity to save Sirius in a different way.
One interesting plot could be a redo of the Triwizard Tournament where the tasks are even more dangerous and mysterious. Maybe Harry has some prior knowledge this time and uses it to his advantage in unexpected ways.
Maybe in this fanfiction, Harry's second chance at life allows him to prevent certain tragedies. For instance, he could figure out a way to save Sirius Black much earlier. He might have a premonition about what's going to happen and use his knowledge from his first life to change things. This would completely change the dynamic of the story as Sirius could play a more active role in Harry's life and in the fight against Voldemort.
In some Harry Potter 8 fanfictions, there are plots where the characters continue to face new dark magic threats. For example, a new dark wizard might emerge, and Harry, Hermione and Ron have to use their combined skills and knowledge to defeat this new foe. Another plot could be about the exploration of the wizarding world's past in more depth, revealing secrets that were previously unknown.
It could be about giving characters in the Harry Potter universe a second chance at something. Maybe a character who made a big mistake gets a chance to redo a decision. For example, if Neville Longbottom had a second chance to stand up to Voldemort earlier in the story, it could change a lot of things.
One interesting plot could be about the Potter family's hidden secrets being unearthed. Maybe there are ancient spells or prophecies related to them that no one knew before. Another could be a story where the Potter family has to face a new and powerful dark force that is specifically targeting them due to their legacy. And a third plot might involve time - traveling within the Potter family's history to correct past mistakes or learn from them.
In some fanfictions, there are plots that explore the backstories of the less - known characters in the Harry Potter and Legacies universe. For example, a story might focus on the family history of a minor wizarding family and how their actions impact the events at Hogwarts in the present day. It could involve long - lost family secrets, old feuds, and unexpected alliances.
One interesting plot could be the Marauders' adventures during their school days that were not fully explored in the original books. For example, their pranks on other students and how they managed to create the Marauder's Map. Another could be a story where the Marauders interact with Harry in a time - travel scenario, giving him advice and helping him face Voldemort in a different way.
One interesting plot could be a new adventure where Harry discovers a hidden magical artifact in the Forbidden Forest that has the power to change time. This could lead to him having to make difficult decisions about whether to alter the past.