In some Team Natsu time travel fanfiction, they could travel back to a time when one of the members was a child. For example, if they go back to Natsu's childhood, they can see how he grew up, meet his family or friends from that time. It would be a very emotional journey as they learn more about the past of their friend and how it shaped the person he is today. And they might also have to protect his younger self from any threats that could change the future.
One interesting plot could be that Team Natsu travels back in time to the founding of their guild. They get to meet the original members and learn about the guild's true origins. This could lead to some really cool interactions and revelations about the guild's history.
One interesting plot could be Team Natsu traveling back in time to prevent a great disaster that they know will happen in the future. For example, they might go back to stop the resurrection of a powerful dark wizard that later causes chaos in their own time.
One interesting plot could be that Natsu and Wendy travel back in time to the era when dragons were still abundant. They could learn powerful dragon - slaying magic directly from the dragons, which would not only enhance their powers but also give them a deeper understanding of their own abilities and the history of dragon slayers. This could lead to new friendships with the dragons and change the course of future events in their original timeline.
A really cool plot might be that Kakashi time travels and discovers a hidden conspiracy in the past that was related to Team Minato. He then has to work with his past comrades, including Minato, to uncover the truth and prevent a great disaster that he knew about from his own time.
Well, a plot might involve Team RWBY traveling back to the time when the first Huntsmen and Huntresses were being trained. They could get involved in the early development of combat techniques and weaponry. Maybe they end up influencing the way things are taught, for instance, introducing some of their more modern strategies. Or perhaps they go back to a time when a powerful relic was first discovered and have to protect it from falling into the wrong hands, which could change the entire future of Remnant.
One interesting plot could be Natsu going back in time to prevent a great disaster that happened in the past of his world. For example, he might try to stop the initial attack of a powerful dark guild that had long - lasting negative impacts. Another plot could involve Natsu traveling back to his own childhood and having to deal with his past self, which could lead to some comical and heartwarming moments as he tries to impart some of his current wisdom.
One good plot could be Kakashi going back in time and using his future knowledge to prevent the death of his comrades in Team Minato. For example, he might be able to stop Obito from getting crushed in that rockslide. Another plot could involve him trying to change the course of the war by influencing key decisions made by his team. He could also go back and try to train himself better in the past, using the skills he's learned in the future.
Well, Natsu could time travel to a time when the different dragon slayers were all being trained by their respective dragons. He could interact with them, learn new dragon slayer techniques, and form alliances that could help in his own time. Another idea is that he travels to a time when there was a great imbalance in magic power in the world, and he has to find a way to restore the balance. He could also go back in time to meet a long - lost relative or an important figure in the history of magic and get some crucial information or power from them.
You could write an 'team natsu oc fanfiction' where the OC is from a different dimension and has different cultural norms. This OC could introduce new concepts and ways of thinking to Team Natsu. Maybe the OC's dimension has a different way of using magic, like combining it with technology, and Team Natsu has to adapt to this new form of magic while also teaching the OC about their own magic system.
One possible plot could be that the kidnappers are from a rival guild who want to use Natsu as leverage against Fairy Tail. Gray could then embark on a solo mission to rescue Natsu, facing various traps and enemies along the way. He might have to use his ice - make magic in creative ways to overcome obstacles.
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?