Maybe Harry finds himself in a situation where he has to team up with the Marauders to fight a common enemy that was previously unknown in the original Potter story. This would create a whole new dynamic and show how different generations of Hogwarts students can work together.
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.
Perhaps a plotline where the Marauders' spirits or echoes are awakened in Harry's time at Hogwarts. They start guiding him in his fight against Voldemort. They teach him spells and strategies that they used during their own battles against the Dark Arts. This would give Harry an edge and also create some really heartwarming and funny interactions as he tries to keep their presence a secret from his friends.
In some fanfictions, other characters like Dumbledore might also play important roles. He could be the one who arranges the encounter between Harry and the Marauders, either knowingly or unknowingly. And Hermione and Ron might also be involved in some cases, perhaps helping Harry understand the implications of meeting his father and his friends from the past.
Well, obviously Harry Potter is one of the main characters. And then there are the Marauders: James Potter, Sirius Black, Remus Lupin, and Peter Pettigrew. They are central to the story as it's about Harry meeting them.
The fanfiction could show Albus Potter learning about the Marauders' values and how they formed their strong bond. He might be in a situation where he needs to form his own group of friends like the Marauders did. The Marauders could also help Albus deal with the pressure of being a Potter. For example, they could tell him how James Potter coped with all the attention he got, and this would give Albus some perspective on his own situation at Hogwarts.
One interesting plot could be Harry time - traveling and getting to join the Marauders on one of their pranks at Hogwarts. He might learn some new spells and mischief - making techniques from them.
In this fanfiction, perhaps James Sirius Potter could learn some of the classic pranks the Marauders were famous for. He might get into all sorts of adventures, following in their footsteps and causing a bit of chaos at Hogwarts just like they did.
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.
The Marauders' reactions would vary. Sirius, being the daredevil and fun - loving one, would be eager to share the most interesting fanfictions he found with his friends. He'd get a kick out of the wild plot twists. James, who was a bit of a perfectionist, might be a little put off by inaccuracies or departures from what he considered the 'true' story. Remus, with his calm and intellectual nature, would analyze the fanfictions, perhaps even using them as a way to understand how the wizarding community perceived their group and their era.