In this 'Harry Potter creates a mutant school' fanfiction, Harry could start the school after seeing the discrimination mutants face. He'd make it a place where mutants can be themselves. The school might be hidden in a magical dimension, accessible only by those with a special key or spell. There would be different houses, not like Gryffindor or Slytherin, but based on the type of mutant powers. Harry would have to deal with issues like mutants using their powers for evil, just as he had to deal with dark wizards at Hogwarts. He'd also introduce the mutants to the wizarding world's culture, creating a unique blend of the two.
One possibility is that Harry Potter, using his knowledge of magic and experiences, decides to create a school for mutants. He could use spells to protect the school from the outside world and those who might fear the mutants. He might also teach the mutants how to control their powers, just as he learned to control his magic at Hogwarts.
Well, it could be a wild mix of magic and mutation. Maybe Harry Potter uses his magic to accidentally create a mutant in the world of 'sch' (whatever that is in the fanfiction context). It could lead to a whole new set of adventures as he tries to deal with the consequences of this creation, like trying to find a way to control or help the mutant.
The plot could start with Harry finding an ancient Jedi artifact during one of his adventures. This leads him to become curious about lightsabers. He then uses his magic knowledge to try and replicate it. Along the way, he might face opposition from some in the wizarding world who think it's too dangerous or against wizarding traditions. But Harry, being the hero he is, persists. Eventually, he creates a lightsaber and uses it to defeat a new, powerful dark wizard who has emerged, using both his wizarding skills and his new lightsaber skills.
In a fanfiction where Harry Potter creates a virus, perhaps it's a virus that affects magic itself. The virus could spread through spells and start to corrupt the very essence of magic. Harry, realizing the severity, might then have to team up with his old friends like Hermione and Ron. They would search for ancient magic or rare potions to counteract the virus before it destroys the entire magical ecosystem.
In a 'Harry Potter creates a shelter' fanfiction, perhaps Harry uses his magic to create a shelter in the Forbidden Forest. He might use spells like Protego Totalum to make it safe from dark creatures. It could be a place where he hides his friends during a dangerous time at Hogwarts, like when Voldemort's forces are on the prowl.
One possible plot could be that Harry, after defeating Voldemort, decides to create a kingdom where magic and non - magic folk can live together in harmony. He uses his knowledge of magic and the respect he has gained to build a new society with its own set of laws and governance that are fair to all. For example, he could create schools that teach both magic and Muggle subjects to promote understanding between the two worlds.
Well, perhaps Harry Potter, using his magic, accidentally creates the world of Remnant from RWBY. He might then have to deal with the new and strange creatures and powers there, while also trying to find a way to get back to his own world.
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.
It could be a dark wizard who wants to use the mutant for his own evil plans. He might see the mutant as a powerful tool to gain control over the wizarding world.
Maybe some young mutants that Harry discovers during his travels in the Muggle world. He could sense their powers and offer them a place at his new school.
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.