Perhaps they are inventors in their own right in the non - magical world. In the fanfic, they could create something that catches the attention of the wizarding world. It could be a new type of device that has applications in both worlds. They are then invited to Hogwarts to demonstrate it. There, they meet Harry Potter and get involved in the school's drama, such as helping to protect the school from a new threat that is targeting their invention.
The Dixon Brothers could be muggles who are accidentally exposed to the wizarding world. They might start out as skeptics but then become intrigued. For example, they could be neighbors of the Weasleys when they are on a mission in the non - magical world. Harry Potter could then be the one to introduce them to the wonders of magic and they could help Harry in some way, like using their street - smart skills to navigate a dangerous part of the non - magical world where a dark wizard is hiding.
Pikachu could be a special guest at Hogwarts. It might be brought there by a powerful wizard who has traveled to other dimensions. And it could use its electric attacks to protect the school from dark forces.
Another fanfic could involve a plot where the Dixon Brothers are descendants of a long - lost wizarding family related to Hogwarts. They discover their magical heritage through a series of strange events. As they enter the wizarding world, they have to learn magic quickly while also dealing with the political and social aspects of the wizarding community, all with Harry Potter as their guide.
Alucard could fit as a powerful outsider. His vampiric abilities like super strength, speed, and the ability to turn into mist or a bat would be very different from normal wizard magic. He could be a sort of anti - hero, helping Harry when it suits his own goals. For example, if there was a dark wizard using blood magic in a way that threatened Alucard's existence too.
Dick Grayson could fit in as a new kind of hero in the wizarding world. He could use his detective skills, which he developed in the Batman universe, to solve magical mysteries. For example, if there were a series of strange disappearances in Hogsmeade, he could use his deductive reasoning to figure out what was going on, much like he did in Gotham.
In fanfiction, Daryl Dixon could be a time - traveler who ends up in the Harry Potter universe. He'd be confused at first but quickly adapt. He could end up being a mentor to some of the younger students, showing them how to be tough and resourceful. His knowledge of tracking could be used to find hidden magical items or enemies. And his loyalty and sense of justice would make him a great ally to Harry and his friends.
Dragons in 'Harry Potter' fanfics often serve as powerful and mysterious elements. They can be used as a plot device to introduce danger or adventure. For example, a dragon might be guarding a hidden treasure or a powerful magical object. In some fanfics, characters might form bonds with dragons, like in the books where Hagrid has an affinity for dangerous magical creatures.
A Wendigo could be a dark and mysterious addition. It could be part of a new threat that emerges from the Forbidden Forest. The magical creatures in the forest might be afraid of it, and it could start preying on students who wander too far. Harry and his friends would need to use spells like the Patronus to protect themselves.
Supergirl could be a foreign exchange student of sorts in the Harry Potter universe. She could be there to study magic while also sharing her own Kryptonian knowledge. Her superpowers would make her stand out, but she would also have to learn the rules of the wizarding world, like not using her powers when it's against the wizarding code.
One way is through his magic. His spells could be in a state of superposition. So a spell like 'Expelliarmus' could be both cast successfully and not cast at all until some 'measurement' in the story. For example, if he casts it at an enemy, the enemy's reaction could be both disarmed and still armed until the moment of impact, which is like the 'observation' in Schrödinger's experiment.
One way could be through a powerful dark wizard's experiment. Maybe a wizard, seeking ultimate power, discovers a way to bring the Infinity Stones into the magical world. They could be hidden as powerful magical artifacts, and their powers might be harnessed in a way similar to how wizards use magic. For example, the Time Stone could be used to manipulate time within the wizarding world, perhaps to reverse a tragic event or to gain an advantage in a battle.