One idea could be Logan travels back in time to prevent a major event that led to the downfall of his kind. He could use his knowledge and skills to change key decisions, creating a whole new timeline full of different challenges and relationships.
Perhaps Logan travels back to his own past to relive certain moments. He might try to change how he dealt with certain people or situations, like his relationship with the X - Men. This could lead to a more complex exploration of his character, as he grapples with the consequences of his time - traveling actions.
One idea could be that the next - generation Avengers accidentally travel back in time and interfere with a key event in the original Avengers' history. This causes a ripple effect that changes the present in unexpected ways. For example, they might prevent Tony Stark from creating the first Iron Man suit, leading to a world where technology has developed differently. They then have to figure out how to fix the timeline while also dealing with the different threats in this new reality.
One idea could be that the Vault Hunters accidentally stumble upon an ancient alien device that sends them back in time. They then have to navigate the past Borderlands, which may have different versions of their enemies or allies. They could also meet the ancestors of the characters they know and change the course of history in unexpected ways.
In a fanfiction plot, Starkiller could travel to different time periods to collect powerful artifacts. Each time period has its own challenges and enemies. As he travels through time, he starts to understand the true nature of the Force and how it has been manipulated throughout history.
They could go on a road trip together. Along the way, they encounter various strange characters and have to solve different problems. For instance, they might run out of gas in the middle of nowhere and have to find a way to get to the nearest gas station while also dealing with a group of over - enthusiastic fans who recognize them.
Perhaps in the fanfiction, there's a school event like a masquerade ball. Veronica is initially hesitant to go with Logan, but he convinces her. At the ball, they get lost in the crowd and find a quiet corner. They start talking about their past misunderstandings and as they do, they hold hands for the first time, leading to a more intimate moment that is the start of their relationship.
Maybe a villain from the future travels back in time to eliminate the Cobra Kai dojo before it even starts. This would disrupt the entire timeline of the series. The heroes would then have to figure out a way to stop this time - traveling villain and preserve the dojo's existence.
One idea could be that Khal Drogo travels to the future and is amazed by modern technology. He might see skyscrapers and cars and think they are strange magic. He could try to adapt to this new world while still holding onto his warrior ways.
Maybe they time - travel to a time when a great war was about to start. Sakura, with her medical skills, and Sai, with his strategic thinking from being an Anbu, could work together to prevent the war. They could try to change the minds of the leaders involved by showing them the future consequences of the war. This would involve a lot of sneaking around and trying not to be discovered as time - travelers.
One idea could be that Phoenix Wright travels back in time to his law school days. He uses his future knowledge of the law and courtroom tactics to ace his exams and gain early notoriety. This would change the way his early career unfolds and potentially make him an even more formidable lawyer earlier on.
One idea could be that they travel back to the time when the Targaryen dynasty was at its peak. Jon could see Daenerys in her element as a Targaryen princess. They might try to change some of the events that led to the downfall of the Targaryens, like preventing the Mad King's actions. But this could have unforeseen consequences for the future they came from.