Who could be the main characters in a 'us soldiers back in time fanfiction'?

One possible plot could be that a group of US soldiers are sent back in time during a military experiment gone wrong. They end up in a crucial historical battle, like the Battle of Gettysburg. They use their modern military knowledge and advanced weaponry (to a certain extent if they still have it) to change the outcome of the battle, which then has a ripple effect on the course of history.

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.

A young and inexperienced member of the vanguard could also be a main character. Their naivete in dealing with the past could create interesting situations and conflicts. For example, they might accidentally change a small detail that has big consequences.

Obviously, Kaneki himself would be the central character. But also, his friends like Hide could be involved. Hide was always there for Kaneki, and if Kaneki goes back in time, he might want to protect Hide better from the start. Touka could also be a major part. Maybe Kaneki goes back to a time when he first met Touka and tries to change their relationship for the better, and together they could work towards changing the fate of ghouls.

Obviously, Ladybug and Chat Noir are likely to be involved. Their relationship is a central part of the Miraculous Ladybug story. If it's about 'back to us', it could be about them getting back to their strong partnership after a fight or misunderstanding. They are the ones who protect Paris together, so any change in their relationship affects the whole 'us' in the city.

Inuyasha could be one of the main characters. Since he has a strong connection with Kagome in the original story, he might also be involved in the time - traveling adventure. Maybe he follows Kagome back in time or is already in the past waiting for her.

As I'm not familiar with the 'A Time for Us Novel', it's difficult to determine the main characters. However, considering the title, it could be two individuals who are in a relationship, like a man and a woman who are from different backgrounds and their journey to be together could be the focus. Or it could be a family unit where each member plays an important role in a story about family values and togetherness during a certain time.

A young girl who has always been fascinated by the story of the Titanic could be the main character. She somehow finds herself transported back in time to the ship. She might be on a mission to save her favorite characters from the movie, like Jack. And through her journey, she discovers a lot about herself and the power of love and friendship on the doomed ship.

Frieza would be a great antagonist. If Goku goes back in time to a point before Frieza was defeated, Frieza could be an even more menacing force as Goku might not have all the power - ups he had in the original timeline. He'd have to rely on his wits and basic training more.

Cell could be a great antagonist. Even if Gohan goes back in time, Cell might still find a way to exist. Maybe he adapts his plan to absorb the Androids earlier in time. Gohan would then have to face a more powerful and unpredictable Cell, who could potentially change the timeline to his own advantage.