Perhaps Harry decides to use magic to improve the country's infrastructure. He might use spells to build instant bridges, clean up polluted areas, or create self - sustaining magical farms. This would not only transform the physical landscape but also boost the economy as resources are managed more efficiently.
One possible plot could be Harry using his magical knowledge to revolutionize the country's education system. He could introduce Hogwarts - style teaching methods, like practical magic lessons and house systems to encourage competition and cooperation among students.
Ron could also be an important ally. His loyalty and courage would be great assets. He might be in charge of security or diplomatic relations with other magical communities, using his Weasley charm to smooth things over.
Maybe in this fanfiction, Harry discovers a new kind of magic that allows him to reshape the wizarding world's laws across the globe. He could make Hogwarts - style education available everywhere, even in the remotest Muggle villages. This would not only spread magic knowledge but also bring the two worlds closer together.
One idea could be that Harry discovers a hidden magic within Azkaban that allows him to free wrongly imprisoned witches and wizards. He then uses this to his advantage to reform the wizarding prison system.
In such a fanfiction, perhaps Harry Potter could use his magic to find an unclaimed land. He might then use spells like 'accio' to gather resources for building infrastructure. He could also use magic to educate the people, like creating self - teaching spell books.
Well, perhaps the Omnitrix gets mixed up with the magic in Hogwarts. It starts malfunctioning and instead of the usual alien forms, it gives Harry forms of ancient wizards. He has to figure out how to control these new forms while also dealing with the mystery of why the Omnitrix is acting this way. And he might learn new spells and magic from these wizard forms.
One idea could be that Palpatine somehow discovers the wizarding world of Harry Potter. Maybe he sees it as a new realm to conquer. He could try to manipulate the Ministry of Magic using his Sith mind - tricks, and Harry Potter would have to figure out who this strange new threat is and stop him. It would be a clash of two very different kinds of magic.
Maybe in the 'Harry Potter in Undertale fanfiction', Harry discovers that Voldemort has also found his way into the Undertale world and is trying to gain power there. Harry has to learn the rules of this new world quickly. He befriends Sans and Papyrus. Sans, with his knowledge of the resets in Undertale, helps Harry understand how to manipulate time in a way that could give him an edge against Voldemort. Papyrus, on the other hand, is enthusiastic about Harry's magic and they train together to fight off Voldemort's minions in the Undertale world.
Another plot could be that Voldemort discovers Powergirl's existence and sees her as a threat. He tries to manipulate the wizarding world against her. But Harry and his friends believe in her and together they work to expose Voldemort's lies and also learn from Powergirl about different ways of fighting evil. Powergirl could introduce new concepts of justice and heroism to the wizarding world.
One possible plot is that Harry, as a blacksmith, is sought after by all the magical communities. He could create a new kind of portkey that is not only more stable but also has the ability to transport large groups of people at once. His blacksmithing skills could also be used to create a device that can detect dark magic from a distance. This would make him a valuable asset in the wizarding world. He could also hold blacksmithing workshops at Hogwarts, teaching the younger students the art of creating magical items, which would be a great way to pass on his skills and knowledge.
One possible plot could be that the Kubikiribocho, the sword in Naruto, somehow finds its way into the Harry Potter universe. Harry discovers it during one of his adventures in the Forbidden Forest. He initially has no idea how to use it but gradually realizes it has some unique powers that can be harnessed against Voldemort. For example, it might be able to cut through dark magic spells. However, there are also some negative aspects to the sword as it tries to corrupt Harry a bit, just like the influence of the Horcruxes. Harry has to fight against this internal battle while also using the sword's power to defeat Voldemort.