In some cases, other characters from the Harry Potter universe might be included. For instance, Harry Potter himself could make an appearance. Maybe Teddy travels back to a time when Harry was at Hogwarts and they end up working together on some sort of mission or adventure. It adds an extra layer of connection to the overall wizarding world story.
Obviously, Teddy Lupin is the central character. But often, his family members from the past like his father, Remus Lupin, and his mother, Tonks, are also involved. Their relationships and how Teddy interacts with them in the past are key elements of the story.
Hermione Granger could also be a character in Teddy Lupin time travel fanfiction. Given her intelligence and knowledge of magic, she could play a crucial role in helping Teddy understand the implications of his time travel. She might help him figure out how to fix any disruptions to the timeline that his presence has caused.
Well, Naruto is the top one. As the Jinchuriki of the Kyuubi, he's at the center of it all. But don't forget about Jiraiya. He has a huge influence on Naruto and his past self could be a key factor in any time travel plot. And then there's Hinata. Her relationship with Naruto could be explored in new ways if time travel is involved. For example, she could help Naruto in the past in ways she didn't before, adding a new dimension to their relationship.
In 'ff8 time travel fanfiction', Zell could also be a main character involved. His energetic and impulsive nature might lead him to accidentally stumble into a time - travel situation. He could then use his fighting skills in different time periods, creating interesting storylines. Laguna Loire might be involved too. Since he has his own mysterious past and connection to Squall, time travel could be used to further explore those relationships and his role in the overall ff8 lore.
Obviously, Revan himself is the central character. But often, characters like Bastila Shan are also involved. Since she was closely associated with Revan in the original story, she might play a role in his time - traveling adventures. Maybe she follows him through time or is the reason he decides to time travel in some fanfictions.
Often, Percy Jackson might be involved. Since he is a central character in the same universe as Nico, their paths could cross during Nico's time - traveling adventures. Percy could either be a helper or someone who needs Nico's help due to the changes in time.
Well, aside from Teddy and the Marauders, there could be other characters as well. Maybe some of Teddy's friends or classmates from his own time who are somehow involved in his journey to meet the Marauders. For example, if Teddy discovers a time - traveling spell in the library with the help of a studious friend. But the core characters would still be Teddy Lupin and the Marauders. Teddy is the link between the present and the past in this story, and the Marauders are the ones with all the stories and experiences from their time at Hogwarts.
Well, Ben Tennyson is obviously the main character. He's the one with the Omnitrix and is usually the one doing the time traveling.
In some Harry Potter fanfictions about Teddy Lupin's time travel, he might go back to prevent certain tragedies. For example, he could try to save his father Remus Lupin from the final battle. He might use his knowledge of the future to change the course of events, perhaps by warning the Order of Phoenix earlier about Voldemort's plans.
One interesting story could be where Teddy Lupin travels back in time to meet his parents. He gets to experience their lives firsthand and maybe even change some small things that have a big impact on his own future. It could be a heartwarming tale of family connection.
Sasuke is also a popular choice. Given his complex character and his quest for power, in a time - travel scenario, he could go back in time to gain more power or change the events that led to the downfall of his clan. Another character is Kakashi. His past and his relationship with Obito could be explored in a time - travel fanfiction. He could try to prevent Obito's fall to the dark side if he had the power to time - travel.
King might also be a character in time travel fanfiction. His search for his true identity could be further explored through time travel. He could go back to the time when his species was more prevalent in the Boiling Isles to learn about his origins, which would be an exciting adventure in the context of time travel fanfiction.