Maybe Harry Potter has to use his magic to fight against the apocalyptic disasters like hordes of dark creatures or a spreading deadly magic. He could gather his friends and allies from Hogwarts and the wizarding world to try and stop the end of the world.
The characters would change in many ways. Harry Potter, who has already faced so much, would become more of a survivalist. He might be more willing to take risks that he wouldn't have before. Hermione would likely turn into a strategic mastermind, thinking several steps ahead to counter the chaos of the apocalypse. Ron, on the other hand, would probably develop a more serious side. No longer could he rely on just his loyalty and friendship; he'd have to be a fighter. Neville, who has shown great courage in the original series, would become a symbol of hope, inspiring others to keep fighting. And the villains, if any are still around, would either try to take advantage of the apocalypse or be forced to side with the heroes in order to survive.
It could be the old enemies who see Naruto's new form or role as a threat. Maybe Orochimaru, who is always after power, would try to stop Naruto or take advantage of his new state. He might think Naruto's power in this apocalyptic scenario can be harnessed for his own evil purposes.
Well, perhaps Naruto becomes the new apocalypse in a sense that he has been corrupted by some powerful evil force. His friends would then be in a dilemma of having to either stop him or try to save him. His transformation could also lead to a new power hierarchy in the ninja world, with everyone fearing his new, unpredictable abilities.
One idea could be that Harry discovers a hidden centaur community in the Forbidden Forest. He's initially scared but soon realizes they have a deep connection to magic that Hogwarts has not taught. He starts learning from them, about their archery skills and how they communicate with nature.
If Harry Potter becomes a Sith in fanfiction, it would be a wild departure from his original character. He'd likely trade his Gryffindor values for the dark and power - hungry ways of the Sith. His magic could take on a more menacing form, and his relationships would be severely strained. For example, his friendship with Ron and Hermione might turn into enmity as he delved deeper into the dark side.
Well, if Harry Potter becomes a genie in fanfiction, he could use his magic in very different ways. He might be able to grant wishes, which would be a huge change from his usual spell - casting. For example, he could grant the wishes of his friends like Hermione and Ron. Maybe Hermione would wish for all the knowledge in the world to be easily accessible, and Harry as a genie could make it so.
Harry could form an alliance with the goblins. Since Slytherin was known for his cunning and business - like acumen, Harry as Lord Slytherin could use this to his advantage. He could negotiate with the goblins for better terms regarding Gringotts and perhaps form an economic alliance that benefits both the wizarding world and the goblins. Also, he might form an alliance with some of the magical creatures. Slytherin had an affinity for snakes, so Harry could use this connection to reach out to other magical creatures, building bridges between humans and non - humans in the wizarding world.
He might gain the ability to track without magic. In the wizarding world, he could use spells like 'Homenum Revelio' to find people, but as a hunter, he would learn to read signs in nature, like footprints and broken branches. Also, he could become very skilled with non - magical weapons, like bows and arrows or knives. His physical strength could improve from all the hunting activities, such as running after prey and climbing trees.
Sure. In the world of 'Harry Potter' fanfiction, the concept of Dudley as a wizard isn't unheard of. Some fanfictions might use this idea to show Dudley's redemption arc. He could start as the bully we know from the original books but then transform into a wizard and learn about the values of the wizarding community. It can also be a way to explore the Dursley family's relationship with magic in a different light, rather than just being Muggles who shun it.