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.
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.
One challenge is trust. Not everyone will immediately believe in Naruto's intentions. Some may think he is trying to gain power for himself. Another challenge could be resources. Feeding, housing, and training an army requires a lot of resources. He needs to find ways to get enough funds and supplies.
It could also change his relationships. His friends might be worried about this new and rather extreme power he has. They might question his motives and whether this is the right way to deal with the problems in the wizarding world. On the other hand, his enemies would definitely be more cautious around him.
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.
In fanfiction, Harry Potter might face the challenge of dealing with dragon politics. Just like in the wizarding world, dragons might have their own hierarchies and rivalries. Harry would need to navigate these complex relationships to be able to work effectively with them. For example, if he befriends one dragon, other dragons might become jealous or see it as a threat. Another challenge could be the lack of resources. Taking care of dragons requires a lot of food, space, and magical items for their well - being. Harry would have to find ways to secure these resources, especially if the wizarding community is not fully supportive of his work with dragons.
One challenge could be the conflict between the rules of magic he already knows and the new principles of the Force. For example, the way spells are cast in magic is very different from how one might use the Force, so he has to unlearn some habits. Another could be the opposition from some of the more traditional Hogwarts professors who see the Force as something foreign and potentially dangerous.
He would face the challenge of over - protection. Given his own history filled with danger, it'd be hard for him not to be overly cautious with his kids. For example, he might be reluctant to let them participate in dangerous school activities like the Triwizard Tournament.
As king in fanfiction, Harry Potter would face several challenges. Firstly, there's the issue of uniting the different factions within the wizarding world. The Slytherins, who have often been at odds with Harry, might not be so easily won over. He also has to deal with the economic side of things. Ensuring that there are enough resources for all wizards and witches, from potion ingredients to housing. And then there's the matter of public opinion. Not everyone might agree with his decisions, and he has to find a way to listen to the people while still making the right choices for the long - term good of the wizarding world.