Another plot could involve a time rift opening up that sucks in the Vault Hunters. They end up in different time periods within the Borderlands universe. In one time period, they find a lost Vault that was thought to be just a legend. But they also face the challenge of getting back to their own time without causing too much damage to the timeline.
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.
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.
Another plot could involve Elizabeth Swann time - traveling. She gets sent to a future version of the Caribbean where piracy has been completely eradicated. However, she discovers that without pirates, the balance of power in the region has been thrown off and there are new tyrannical forces at play. So, she has to find a way to bring back the spirit of piracy in a more civilized way to restore the balance. She uses her knowledge from the past and her wits to start a revolution of sorts.
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.
One idea could be that Simon travels back in time to the beginning of the spiral war. He could use his knowledge of future events to better prepare the Dai - Gurren Brigade, leading to a quicker victory against the Beastmen. Maybe he'd also find a way to save some of the characters who died in the original timeline.
You can have existing characters like Handsome Jack be affected by time travel. For example, he could be sent back to a time when he was just starting his rise to power. This would show a different side of him, perhaps more vulnerable or idealistic before he became the tyrant we know. The Vault Hunters could then interact with this younger Jack and either try to change his future or be influenced by his earlier ideas.