The exploration of the wizarding world is a major part. When Harry creates magic, it can open up new areas of the wizarding world to be explored. It could be a hidden chamber where the new magic was born or a new group of wizards who are interested in his creations. This allows the author to expand on the already rich Harry Potter universe and take the readers on a new and exciting journey.
One idea could be that Harry discovers an ancient spell book in the Room of Requirement that has the incantations for creating a magic railgun. He might use it to defend Hogwarts against a new, powerful dark force that is immune to traditional magic spells.
There is also a fanfiction called 'Magic Beyond Boundaries' in which Harry creates magic that defies the traditional rules of the wizarding world. This leads to a series of adventures and challenges as he tries to convince the wizarding community that his new magic is not dangerous but rather a new way forward. The author does a great job of building a world within the existing Harry Potter universe and exploring the implications of Harry's creative magic.
Well, if Harry Potter creates his own magic in fanfiction, it could lead to him being either celebrated or feared. On one hand, his new magic could solve many of the problems the wizarding world faces. But on the other hand, the Ministry of Magic might see it as a threat to their control. They could try to regulate or even suppress his new magical creations.
Harry may decide to have a more intuitive magic system. Instead of relying on wands, which can be lost or broken, the magical beings on his planet could use their minds and emotions to cast spells. The stronger the emotion or intention, the more powerful the spell. And to prevent misuse, there could be a natural balance in the planet's magic. If someone tries to use dark magic, the planet itself could resist and weaken the spell, teaching the user that dark magic is not welcome.
One idea could be that Harry creates a school for magical creatures. He realizes that there are so many unique and often misunderstood creatures in the wizarding world, and he wants to give them a place to learn and grow. This school could teach them how to interact with wizards in a positive way, as well as develop their own magical abilities.
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.
Well, it could be about Harry using his skills and magic knowledge to custom - create a super - powered Firebolt. Maybe he adds some unique enchantments to it for speed or stealth.
Dumbledore, even if in spirit or through some magical means, could be an ally. His wisdom and foresight could guide Harry in making important decisions for the kingdom. Also, the house - elves, if Harry treats them fairly and gives them freedom and a place in the kingdom, could be loyal allies. They could take care of the day - to - day running of the castle or important buildings in the kingdom, using their unique magical abilities.
Harry is the main one, but other characters could be involved in different ways. Neville could accidentally stumble upon Harry's secret project and, in his clumsy but kind - hearted way, end up helping. Luna Lovegood might offer some out - of - the - box ideas with her unique perspective on magic. And Dumbledore, with his vast knowledge and wisdom, could be a guiding figure in the background, giving Harry some cryptic advice that helps him in the creation of the Firebolt.