There could also be other supporting characters. For instance, some of Harry's friends from Hogwarts like Ron and Hermione might make an appearance. They could be skeptical of Teddy at first or be involved in the adventures that Harry and Teddy go on. Also, Teddy's family or friends might be mentioned or even play a small part in the story, which could add more depth to his character.
There could also be some minor characters from the Marauders' era that might become more prominent. For example, Lily Evans, Harry's mother. Her relationship with James and how she might interact with Harry in this strange time - traveling or spirit - meeting scenario could be really interesting. And then there are the Hogwarts professors from both eras that could be involved, like Professor McGonagall, who could either be a guiding force or be a bit skeptical of Harry's new interactions.
Well, it could be about Harry Potter, in his younger days, stumbling upon a teen Teddy. Maybe they team up to face some sort of magical mystery in Hogwarts. For example, they might find a strange enchanted object that's causing chaos in the school and they have to figure out how to stop it.
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.
The main characters would surely include Harry Potter. Since it's about him meeting the founders, he's central to the story. As for the founders, they are key too. Godric Gryffindor might be the most enthusiastic about meeting Harry, seeing in him the true spirit of Gryffindor. Helga Hufflepuff could be the nurturing one, teaching Harry about the importance of hard work and loyalty. Rowena Ravenclaw might offer him wisdom, and Salazar Slytherin could present a more complex relationship, as his views on blood purity might clash with Harry's, but still be an important part of the story as Harry tries to understand and reconcile different magical ideologies.
Hermione and Ron would probably be there. They are Harry's best friends, so they might be like aunt and uncle to Teddy. They could help Harry out with raising Teddy, like Hermione giving educational advice.
Obviously, Harry Potter and the prime minister would be the main characters. Harry, with his skills and knowledge of the wizarding world, and the prime minister, representing the Muggle leadership.
There could be other supporting characters too. Maybe some of Harry's friends from Hogwarts like Hermione and Ron could make an appearance in the fanfiction. They might be initially skeptical of Carskile but then grow to accept him. And on Carskile's side, he could have his own set of friends or family members who play a role in the story, for example, his sister who gives him advice on how to deal with Harry.
Obviously, Teddy is one of the main characters. He is likely to be the one driving the story forward with his actions and reactions.
Obviously, Albus Potter and the Marauders - James Potter, Sirius Black, Remus Lupin and Peter Pettigrew. There might also be some other characters like Albus's friends or professors who could be involved in the story.
In most teddy harry potter fanfic, Teddy Lupin is at the center. But other characters like Hermione Granger could also play important roles. Maybe she helps Teddy with his studies or gives him advice. And Ron Weasley could be there too, adding some humor to Teddy's adventures. Also, characters from Teddy's family, like his grandmother Andromeda, might be included to show his family background and support system.