It would be very different from the normal Harry Potter stories. It might involve dark magic and a deviation from the moral code of the wizarding world. Maybe Harry would be in a desperate situation and make a really bad choice to summon the devil.
A 'Harry Potter summons the devil' fanfic would likely be a very dark and controversial piece. It could involve Harry delving into the darkest corners of magic that are never explored in the original series. The devil in this context might be some sort of extremely powerful and malevolent entity. The story might show how Harry's life spirals out of control as he tries to deal with the consequences of his actions. It could also explore how the wizarding community reacts to such a heinous act, with some perhaps being tempted by the power the devil might offer and others firmly against it. This type of fanfic would be a far cry from the more light - hearted and morally - centered original Harry Potter stories.
I'm not entirely sure if there is a specific 'Harry Potter summons the devil' fanfic. Fanfiction is a huge realm with all kinds of ideas. But in the official Harry Potter universe, magic is more about good - evil magic like summoning the devil is not in line with the main story. It could be a very niche and probably not very popular idea among the more traditional Harry Potter fans.
It could be a very dark and twisted take. Harry might grow up with a completely different set of values, perhaps being more ruthless and less empathetic. His magic could be used in more malevolent ways, and his relationships with the wizarding world would be severely strained as he's been influenced by the devil.
One possible plot could be a wizard accidentally stumbles upon a Devil Fruit while on an adventure in a far - off land. He eats it and gains the power, say, of the Gomu Gomu no Mi (Rubber - Rubber Fruit). Then he has to hide this new power from his Hogwarts friends and teachers at first because he's not sure how they'll react. As he gets used to the power, he starts using it to his advantage in Quidditch, like stretching his arms to catch the Snitch from a great distance. But then dark forces in the wizarding world become interested in his unique power and he has to fight them off with a combination of his wizardry and Devil Fruit ability.
Well, in such a fanfic, Harry might summon a servant with unique powers. Maybe the servant could help him in his battles against Voldemort. For example, the servant could have the ability to detect dark magic from afar, allowing Harry to be more prepared for attacks.
It could be a house - elf. House - elves are known for their loyalty and their ability to do various tasks. They could be very useful to Harry, like helping him keep his dormitory clean or even spying on the Death Eaters.
The plot might involve Harry using his magic in an unorthodox way to summon Cthulhu. Maybe he stumbles upon an ancient spell in the restricted section of the library. Once summoned, Cthulhu could bring chaos to the wizarding world. The dark and eldritch powers of Cthulhu would be in stark contrast to the more traditional magic in Harry Potter. This could lead to a struggle between the forces of Hogwarts and the indescribable horror of Cthulhu.
He would probably be very powerful. With his existing magical abilities from the Harry Potter world combined with the skills of a Jounin, he could be an unbeatable force. He might use magic in ways similar to how a Jounin uses their combat and strategic skills.
A 'Harry Potter with Guns' fanfic would likely blend the muggle concept of guns with the magical elements of the Potterverse. It could introduce new characters who are experts in both gunsmithing and magic. These characters could teach Harry and his friends how to use guns in a magical way. For instance, they might enchant the bullets to have different magical effects like stunning spells or even the ability to break through powerful magical shields. It would be a unique crossover that could attract fans who like to see the familiar world of Harry Potter in a completely new and unexpected light.
It might be a really strange and interesting mix. Harry would probably have Ozpin's calm and collected demeanor. He could be more of a mentor - like figure to his friends, similar to how Ozpin is in his own story. Maybe he would have some of Ozpin's powers, like the ability to see the future or something similar.
Well, it could be really strange yet interesting. Maybe Hinata's shy but determined personality would be transplanted into the Harry Potter world. She could be a new student at Hogwarts, with her own unique magic skills influenced by her Naruto abilities. For example, her Byakugan could be some sort of new magical sight ability in the wizarding world.