Well, it could be a group of ordinary Muggles who rise to be leaders in the Muggle Army. Maybe there's a tech - savvy Muggle named Tom who uses his knowledge of electronics to find ways to detect magic. He could be one of the main characters.
Obviously, Harry Potter is one of the main characters as the title implies. He would be leading the army. His friends like Ron and Hermione would most likely be involved too, providing support and their own unique skills.
In this fanfiction, Harry might also include some of the Hogwarts ghosts in his army. After all, they have a long - standing relationship with the school. Peeves, for example, could be a wild card in the army. He can cause chaos among the enemies. And some of the older students who have a strong sense of justice, like Cedric Diggory's friends, could also be part of it.
Hermione could be a main character. Since she was a Muggle - born witch, her Muggle schoolmates might be very curious about her new life. Harry could also be involved as he had some experience in the Muggle world. Maybe even Ron, as he's always curious about Muggle things. Their presence would bring an interesting dynamic as they try to balance their wizarding selves with the Muggle environment of the reunion.
Often, you'll see Harry Potter himself. He might be involved in helping a muggle adjust to their new lordship in the wizarding world.
Perhaps the Muggle Army discovers a way to create their own magical artifacts. They could use their ingenuity and technology to replicate or even improve upon some of the wizarding world's tools. This would not only give them an edge in their fight for equality but also create a whole new dynamic in the 'Harry Potter' universe as the wizards and witches have to come to terms with Muggles having their own form of magic - like capabilities.
Hermione could be a main character. She might be initially skeptical about Harry singing muggle music, but then she gets interested in the cultural aspect of it and starts researching the history of the muggle music Harry likes.
Harry himself is obviously very popular. He's the main character in the original series, so in the 'Harry Potter Goes Muggle' fanfiction, readers are interested in seeing how he copes in the Muggle world. Hermione is also popular. Her intelligence and quick - wittedness make for interesting scenarios in the Muggle world, like helping Harry with Muggle studies.
Hermione Granger is often very popular. In muggle world fanfiction, she might be shown using her intelligence to bridge the gap between the wizarding and muggle worlds. Harry Potter himself is also a common choice. His unique position as someone who grew up in the muggle world and then became a part of the wizarding world gives a lot of room for interesting stories. And then there's Ron Weasley, whose family's fascination with muggles can be explored further in fanfiction.
Hermione Granger is often a popular character in such fanfictions. Since she is a Muggle - born witch, she has a unique connection to the Muggle world. Writers might explore her relationship with her Muggle friends before she went to Hogwarts or how she still keeps in touch with them during her time at school. She can act as a bridge between the two worlds in the stories.
Hermione Granger is often a popular character in these fanfictions. Her intelligence and ability to adapt could make for interesting stories in the Muggle world. For instance, she might use her knowledge of magic to solve Muggle problems in unique ways.