A common theme is also the struggle against evil. The Marauders were involved in the fight against Voldemort from an early stage. This is then related to Harry's ultimate battle against Voldemort. Fanfictions may explore how the Marauders' actions and sacrifices paved the way for Harry's victory. It's also about how they all dealt with the presence of dark magic in their lives.
One great piece of young marauders and Harry fanfiction is 'The Marauders' Era' on FanFiction.net. It delves deep into the relationships and adventures of the Marauders during their school days and also shows their connection to Harry's story in an interesting way.
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.
Wattpad also has some 'young marauders fanfiction'. Some Wattpad authors offer unique perspectives on the Marauders' era. However, the quality can vary more on Wattpad compared to Fanfiction.net and AO3, so you might need to do a bit more sifting through the stories to find the gems.
I also like 'The Young Marauders: Origins'. This fanfiction details the very beginning of the Marauders' friendship. It starts from when they first meet on the Hogwarts Express and shows how their bond gradually forms over time, with their individual personalities shining through.
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.
In harry potter the marauders fanfiction, the main characters are the Marauders themselves. James Potter, the confident and sometimes arrogant Gryffindor. Sirius Black, the black sheep of his pure - blood family. Remus Lupin, the kind - hearted werewolf. And Peter Pettigrew, who was initially part of their tight - knit group. Their interactions, friendships, and later the events that lead to their fates are central to these fanfictions. They are often depicted in their Hogwarts days, full of youth, adventure, and magic.
The main characters are usually James Potter, Sirius Black, Remus Lupin, and Peter Pettigrew. James is the confident and sometimes arrogant leader of the group. Sirius is the rebellious and loyal friend. Remus, the werewolf, is often the more reserved and intelligent one. Peter is the follower, though his character can be explored in different ways in fanfiction.
Obviously, Harry Potter is one of the main characters. He is the one being raised by the Marauders. Then there are the Marauders themselves: James Potter, Sirius Black, Remus Lupin, and Peter Pettigrew. Each of them would play a significant role in Harry's upbringing, with James being his father - like figure, Sirius as a cool and adventurous mentor, Remus teaching him about the more complex aspects of magic and life, and Peter, well, his role could be more of a contrast to the others, perhaps with some hidden motives.