Obviously, the main members of Team Natsu like Natsu, Lucy, Gray, Erza, and Happy are always involved. They are the core of the group and any time travel adventure usually revolves around them.
Obviously, Natsu Dragneel is one of the main characters. His impulsive nature often leads to interesting situations during time travel. Lucy Heartfilia is also important as she might use her celestial magic in unexpected ways in the different time periods. Gray Fullbuster, with his ice - magic, could be involved in battles against past or future enemies. And Erza Scarlet, with her strong combat skills and leadership, would play a crucial role in guiding the team through the challenges of time travel.
Well, Inuyasha and Kagome are almost always involved. They are the central characters of the original series, so it's natural for them to be in time travel fanfictions. Kagome is the one who can travel through the well between her time and Inuyasha's time in the original story, so she often plays a key role in any time - travel - related plot. Inuyasha, with his half - demon powers and his connection to the past of the feudal era, is also crucial.
Naruto is usually one of the main characters. After all, it's a Naruto - centered fanfiction. Sasuke might also be involved as he is a central figure in the Naruto series. Sakura could be there too, given her importance in the original story. And sometimes, characters like Kakashi or Jiraiya might be part of the time - traveling group, as they are strong and experienced ninjas who can add depth to the story.
Obviously, Kushina herself is the central character. But often, Minato, her husband, is also involved. Since they are closely related, his actions and reactions to Kushina's time - traveling situation are important parts of the story. Naruto can also be a key character. If Kushina travels to a time when Naruto is already born or in the future, their interactions can be very emotional and drive the plot forward.
Gray is another character. His ice - magic can complement Natsu's fire - magic. They might team up to fight enemies or overcome obstacles in the way of saving Fairy Tail. Sometimes they bicker while doing so, which adds some humor to the story.
Harry Potter himself is often a main character. He might use the time travel necklace to gain more knowledge about his parents or to find a way to defeat Voldemort more effectively.
In some fanfictions, other important characters from the original series like Hermione Granger or Ron Weasley could also be involved. They might help the founders understand the modern world or play a role in the events that unfold during the time - traveling escapades. For example, Hermione's vast knowledge of magic could be useful in deciphering ancient spells that the founders use.
Ron Weasley can also be a main character in such fanfiction. His loyalty to Harry and his own experiences in the original story can add depth to the time - travel redo plot. He could be the one to provide emotional support or come up with unexpected solutions during the time - travel adventures, even if he may not be as well - versed in the technicalities of magic as Hermione.
Often, the characters in this type of fanfiction are Naruto, Sakura, and Sasuke. Naruto's unwavering love for Sakura forms one side of the triangle. Sakura's infatuation with Sasuke is another. The fanfictions usually delve into how these feelings change over time. Maybe Naruto gives up on Sakura, or Sakura finally sees Naruto in a new light instead of being so focused on Sasuke. There are countless ways to tell this love triangle story in fanfiction.
Typically, the focus is on Naruto, Sasuke, and Sakura from Team 7. Naruto's never - give - up attitude is likely to be a driving force in trying to break the time loop. Sasuke's power and his complex personality add depth to the story. Sakura, on the other hand, with her skills as a ninja and her relationship with the other two, is an important part of the exploration of the time - loop concept in this fanfiction.