Maybe the story could revolve around John trying to protect Harry from the threats in the wizarding world. Since John has experience with dealing with dangerous entities, he could use his knowledge to keep Harry safe from dark wizards. He might also form an alliance with some of the wizarding families, like the Weasleys, who are known for their loyalty and courage.
One possible plotline could be that John Winchester, in this fanfiction world, takes Harry Potter under his wing. He could teach Harry all the skills he taught his own sons, like combat and survival in a magical - non - demonic - context. For example, John might show Harry how to track magical creatures using non - magical means, which could give Harry an edge in his Hogwarts adventures.
Another plotline could be that Harry discovers some sort of connection between the wizarding world and the world of the Winchesters. John could then help Harry explore this connection. They could go on adventures together, uncovering secrets that are hidden from both the magical and non - magical communities. This could lead to a whole new understanding of magic and the forces that govern both worlds.
Well, there could be a plotline where Snape's father was an inventor in the wizarding world. He might have created some powerful magic items or spells that were lost or forgotten. Snape, in the fanfiction, could be on a quest to find and revive his father's work. Another idea is that Snape's father was a key figure in a war long before Voldemort's rise, and his actions had consequences that Snape has to deal with in the present day of the fanfiction. There could also be a plotline where Snape's father was a mentor to some other important character, and this connection has implications for Snape's life and the overall story.
One possible plotline could be that Harry Potter is so inspired by John Cena that he starts a new club at Hogwarts dedicated to Cena's values like never giving up. Another could be that John Cena is actually a wizard in disguise and he helps Harry train for battles using his wrestling moves. Or maybe Harry uses magic to bring Cena into the wizarding world to help defeat a new dark force that is too powerful for normal wizarding magic alone.
In this fanfiction, they might team up to fight a common enemy. Harry's magic could be used to create distractions or directly attack the foe, while John's hunting skills and knowledge of the supernatural non - magic side could provide crucial information for their battles. For example, John might know about some ancient non - magical artifacts that could be useful against their enemy, and Harry could use magic to retrieve or protect these items.
One possible plotline could be a crossover in an alternate universe where Harry Potter's father, James Potter, and Tony Stark meet. Maybe they are brought together by some magical - technological mishap. Stark could be intrigued by the magic that James wields and they end up working together to solve a problem that threatens both the wizarding world and the world of technology.
John might initially be skeptical of Harry's magic. However, as he witnesses the good that Harry can do with it, he begins to accept it. He could then start to see Harry as a son he never had in the magical sense. Harry, on the other hand, would find in John a father figure who is more hands - on and worldly in a different way than Dumbledore.
A possible plotline might involve a magical experiment. Harry, being the curious wizard he is, participates in an experiment that has unforeseen consequences on the fabric of time and family relations. As a result, he becomes Hermione's father. The story could then follow how Hermione discovers this truth and how it affects her relationship with Harry. It could also explore how their friends like Ron react to this strange new family dynamic in the wizarding community.
Another plot could involve a sort of magical exchange. Orochimaru, being a master of some dark and strange jutsu in his own world, might offer to teach some of his knowledge to certain dark wizards in the Harry Potter world in exchange for something valuable. Harry Potter and his friends would have to prevent this knowledge transfer as it could tip the balance of power towards the dark side in their world. They might need to seek help from some of the more powerful and wise wizards like Dumbledore to outwit Orochimaru.
Another plot could involve Medusa being a part of a long - forgotten magical mystery that is somehow related to Harry's destiny. Harry, with his inquisitive nature, starts to research about her. As he gets closer to the truth, he has to face the danger of being turned to stone. But through his courage and the help of his friends, he manages to break the curse on Medusa, and in return, she helps him in his fight against Voldemort.
One possible plotline could be Harry struggling to balance his new role as a father with his studies at Hogwarts. He might face challenges from the school authorities who are not used to a teenage student being a father.
One possible plotline could be that Harry Potter discovers he has some sort of supernatural power that is related to the 'father' element in the title. Maybe it's a power passed down from his father that has a connection to the Supernatural world, like the ability to see and communicate with certain spirits or demons.