Also, time - traveling Luffy could interact with characters from different time periods. Maybe he teams up with an ancient pirate to fight against a common enemy. This would create a whole new set of adventures and challenges for him.
Another concept is Luffy traveling to the future. He could see how his actions have shaped the world of pirates. He might find out that his name has become a legend and inspired many new pirates, which would be really cool for him.
One interesting concept is the butterfly effect. In time travel fanfiction, a small change in the past can lead to huge differences in the future. For example, a character might go back in time and accidentally prevent their parents from meeting, which would change their own existence completely. Another concept is time loops, where a character is stuck repeating the same period of time over and over until they figure out how to break the loop. Also, alternate timelines are often explored, showing how different choices in the past can create entirely new versions of the present and future.
One interesting concept could be how Kirk and Spock's relationship evolves differently due to time travel. For example, if Kirk travels back in time and meets a younger Spock, he might see a different side of him. Maybe Spock is more impulsive in his youth, and Kirk has to adapt to this new version while still being in love with the future Spock he knows.
The idea of time travel being a form of punishment or a test is also seen. In some fanfictions, a character is sent back in time against their will as a way to make them face their past mistakes or to prove their worth. It adds a layer of drama to the story. And then there's the concept of time travel devices having their own personalities or rules. For example, a time - traveling watch might only work under certain conditions, like when the wearer is feeling a strong emotion, which can lead to some really interesting plot twists.
One interesting concept is how time travel affects character development. For example, a character might go back in time and change a key event, which then alters their future self in unexpected ways. Another concept could be the exploration of alternate timelines. Maybe a character's time travel creates a whole new reality where different battles play out and relationships shift.
There are several great concepts. One is the concept of fate. In some time travel anime fanfiction, characters try to fight against what seems to be their predetermined fate. They travel through time believing they can change things that are 'meant to be'. Another concept is the time - limited mission. The time traveler has a specific task to complete within a certain time frame in the past or future. If they fail, there could be disastrous consequences for their own time. It adds a sense of urgency to the story. And then there's the idea of the time traveler as an observer. They might not be able to directly change things but are there to witness important events and gain knowledge that they can use in their own time.
One interesting concept could be changing the outcome of major events in the Harry Potter series. For example, going back in time to prevent certain deaths or to alter the course of a battle. Another could be the interaction between the time - traveling Harry and his past or future selves, which can lead to self - discovery and growth. Also, the exploration of different timelines and how they branch out due to time travel is really fascinating.
There's also the idea of preventing certain historical events from happening at all. Maybe a time traveler tries to stop the rise of Hitler before he gains too much power. This would involve interfering with the political and social situations in Germany in the early 20th century.
One interesting concept is how characters might change the course of major events. For example, if a character could go back in time and prevent the death of Ned Stark, it would completely alter the political landscape of Westeros. Another concept could be the discovery of magic related to time travel that was previously unknown in the original series. It could introduce new powers and factions vying for control over this new form of magic.
Some fictions might explore the idea of time loops in the Halo universe. A character could be stuck in a time loop where they keep reliving a certain event in the Halo timeline, like a Covenant attack on a human colony. In each loop, the character learns more about the situation and the enemies' tactics, until they finally break the loop by finding a way to defeat the Covenant in a new and unexpected way.
One interesting concept could be the alteration of historical events. In kakanaru time travel fanfiction, characters might go back in time and accidentally or intentionally change a significant moment in history, which then has a ripple effect on the future. For example, a character could prevent a war from starting, leading to a completely different social and political landscape in the present day of the story.