Here's another story. A group of paratroopers were sent back during a mission. Their plane had mechanical problems. Once sent back, they were redeployed to a different theater of war. They had to quickly adapt to new strategies and fight alongside different units, which was a huge challenge but also an opportunity to learn new combat techniques.
There was a group of engineers sent back from a bridge - building mission that was aborted due to enemy attacks. Back at base, they designed new fortifications and anti - tank traps. Their innovative designs played a crucial role in defending their area from enemy armored units. They worked day and night, using their engineering knowledge and the experience from the failed mission to create effective defenses.
In such a fanfiction, one possible outcome could be a character using knowledge from WW2 to change the course of WW1. For example, they might introduce more advanced military tactics. Maybe they could try to prevent certain events that led to the large - scale destruction in WW1. However, this would also likely cause a lot of chaos as the timeline is disrupted.
Well, in this type of fanfiction, Naruto could change the relationships he had at the academy. He may befriend Sasuke earlier and in a different way, perhaps preventing Sasuke from being so cold towards him initially. Also, he could have more time to train with his classmates and help them improve too, which would make for a very different dynamic in the group.
One possible plot could be that Ron goes back to his Hogwarts days. He could use his knowledge of the future to prevent certain bad things from happening, like maybe he stops a particular dark magic attack on the school. He might also try to improve his relationships, for example, he could be nicer to Hermione from the start and this could change the whole dynamic of their friendship and more.
In such a fanfiction, Percy might use his knowledge of the future to change some key events in the past. For example, he could prevent some of the earlier disasters or conflicts in the Percy Jackson universe. Maybe he'd try to stop the first encounter with a certain monster in a different way to avoid the chaos it caused.
Perhaps Percy will discover secrets about his family or his powers that were previously unknown. Since he's in the past, there could be ancient magic or knowledge that he stumbles upon. This newfound knowledge could give him an edge when he returns to his own time, if he ever does. He might also face challenges like trying to blend in with the people of the past, as his modern ways could make him stand out and cause suspicion.
The plot might involve Percy going back in time and getting involved in a love story that was lost to history. He could fall in love with someone from the past and then have to make a difficult choice when it comes time to return to his own time. It could also be that he has to use his modern knowledge to solve problems in the past that no one else could figure out, which then changes the course of history in small but significant ways.
Another possibility is that his time - traveling could create some sort of time paradox. This might lead to all sorts of strange and unexpected consequences. His presence in the past could disrupt the normal flow of magic and time, and he'd have to find a way to fix it before everything goes wrong.
One possible plot twist could be that Optimus discovers he is the cause of an event in the past that he was trying to prevent. For example, his presence might accidentally lead to the earlier awakening of a powerful enemy. Another could be that he meets a younger version of himself and has to convince his past self to trust him without revealing too much about the future.
Percy Jackson would be an obvious choice. His skills as a demigod and his experience with different quests would make him a great character to be sent back in time. He could use his water powers in unique ways in different historical settings.