Obviously, his friends Ron and Hermione would be among the first to join. Neville could also be a key member, as he has shown great courage. Then there might be the members of Dumbledore's Army who are still at Hogwarts. The Weasley twins could also be part of it, using their unique magical inventions to give the army an edge in battle.
Neville would likely be one of the first to join. He has always been brave and has a strong sense of justice. Luna Lovegood might also be part of it. Her unique perspective and knowledge of the wizarding world could be very useful. And then there are the Weasley twins. Their skills in magic and their ability to think outside the box would make them great assets.
He could have found a magical artifact. There are many artifacts in the Harry Potter world that have strange and powerful abilities. It could be that this artifact has the power to create clones. He figures out how to use it, perhaps with the help of Hermione who is good at researching such things. And then he starts creating his clone army.
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.
He might face opposition from the school authorities or other wizarding institutions. They could see his army - building as a threat. Also, finding resources to train and equip the army could be difficult. Magic items and training grounds are not easy to come by. And he has to keep the existence of the army a secret from the Death Eaters, which adds another layer of difficulty.
Well, it could be about a new threat emerging in the wizarding world where a droid army is created by a dark wizard who has mastered both magic and Muggle technology. Harry and his friends have to figure out how to defeat this army using their own magic skills and knowledge of the wizarding world.
In fanfiction, if Harry Potter joins the army, he'd likely bring his magical skills. He could use spells for things like reconnaissance, making invisible barriers for protection, or even using the Patronus charm to boost morale. His experience fighting Voldemort would give him an edge in combat situations, and his leadership skills developed during his Hogwarts years would make him a valuable asset in military strategy and inspiring his comrades.
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.
One of the main themes is the use of military - style strategies in a magical context. For example, how to plan an ambush against dark wizards like you would in a military operation. Also, the idea of loyalty and camaraderie is often emphasized, both within the wizarding group and among the Ranger trainees. It shows how characters from different backgrounds come together to fight a common enemy. This can create some really interesting and complex relationships in the fanfiction.
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.