One interesting plot could be about characters defying all odds to stay together until the end of time. For example, two star - crossed lovers from different dimensions manage to find a way to be with each other despite the laws of their respective universes trying to keep them apart.
Perhaps a plot where a group of friends make a pact to support each other until the end of time. They face various challenges like wars, diseases, and natural disasters but their bond remains unbreakable. In the fanfiction, their friendship could be the key to saving their world from an impending doom.
One interesting plot could be the Winchester brothers finally achieving a permanent peace in the afterlife. They've been through so much in the series, and in the fanfiction, they might get to rest without any new threats.
I'm not sure specifically as I haven't read it. But it might be about a love story that endures through various challenges until the end of time. It could also deal with themes like friendship, family, and the passage of time.
One interesting plot could be a character going back in time to prevent a certain card from being created, which then changes the whole Yu - Gi - Oh! tournament scene. For example, if the Blue - Eyes White Dragon card was never created, how would the power balance shift among duelists?
One interesting plot could be a character from modern times being transported back to the Tudor era and having to navigate the complex court politics. Maybe they accidentally change the course of history.
One interesting plot could be Superman traveling back in time to prevent the destruction of Krypton. He could use his powers to stop the cataclysmic events that led to its downfall. Maybe he tries to convince the Kryptonian council of the impending danger, but faces resistance as they don't believe him at first.
Another plot might involve Harry exploring different timelines. He could find a timeline where Voldemort never existed and see how the wizarding world developed without the Dark Lord. This would give him insights into the true nature of good and evil and how much Voldemort really influenced the world.
Another plot could involve a character who has been through a traumatic event. Time is a great healer in this case as they start to face their fears. They might go back to the place where the trauma occurred and realize that they have grown stronger and are no longer haunted by the past.
Another plot could be that they travel to a future time where music has evolved into something completely different. They struggle to understand the new forms of music but also bring back some of the old charm from their time, creating a unique blend that revolutionizes the future music scene.
Another plot might be Kratos traveling to a time in the future of his own world. He could see the consequences of his actions and how the world has changed. Maybe he discovers that his actions have led to a new threat emerging, and he has to figure out how to fix it. This would add a new layer of responsibility to his character.
Well, in some time travel Kakashi fanfictions, there's a plot where Kakashi goes back in time right after Obito's 'death'. He tries to save Obito in a different way, not just by taking his eye. He could change the whole course of events that led to the formation of Akatsuki and the many tragedies that followed. This would completely rewrite the story of Naruto in many ways.