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.
Well, in this fanfiction scenario, Harry Potter might discover that Voldemort was just a precursor to a much greater evil that is now causing the apocalypse. He would then have to draw on both his knowledge of the wizarding world and newfound powers or skills to combat this new threat. For example, he could learn ancient spells that have been long forgotten but are now necessary to hold back the chaos. His relationships with Hermione and Ron would also be tested as they face extreme danger and difficult decisions. They might have to make sacrifices that they never thought they would have to in order to save the world.
In a Harry Potter apocalypse fanfiction, it could be that the Muggle world and the wizarding world are both on the brink of destruction. Harry, being the hero, would try to bridge the gap between the two worlds to fight the apocalypse together. He could introduce magic to Muggles on a large scale to give them a fighting chance. The Ministry of Magic might be in disarray, and Harry would have to take on a leadership role not just in the wizarding community but also in trying to unite everyone against the apocalyptic forces. This would involve dealing with politics, both in the wizarding world and the Muggle world, which would add a whole new layer of complexity to his mission.
Maybe Harry Potter uses his powerful magic skills to take over the wizarding world. He could start by defeating all his enemies like Voldemort in a very quick and decisive way and then establish his own rules.
In the fanfiction, Harry might be cursed to transform into a dragon periodically. He then has to figure out how to control this new form. He could meet other magical creatures that are either scared of him or intrigued by his dragon form. He might also find that his dragon form gives him unique powers that he didn't have as a human wizard, like the ability to fly faster or breathe a more powerful type of fire.
Well, perhaps Harry Potter is magically transformed into a Naga. He could then struggle with his new form, having to adapt to the snake - like body. Maybe he discovers new magical abilities related to Nagas, like a special connection with the underworld or some kind of venom - based magic.
Well, perhaps Harry could inherit some of the Hanyou traits like enhanced senses. He might use his newfound abilities to detect dark magic more easily. For example, his sense of smell could help him identify the presence of dark wizards even before they cast a spell.
One possible plot could be that Harry, as a banshee, uses his newfound abilities to warn the wizarding world of impending dark magic threats. His banshee screams might be able to disrupt dark spells or alert people to the presence of Death Eaters. For example, he could sense Voldemort's movements in a more acute way and use his screams to drive away the dark forces when they are about to attack Hogwarts.
One possible plot could be that Harry Potter discovers some hidden good in Draco Malfoy. Maybe he sees Malfoy struggling with the expectations of his family and the dark side he's being pushed towards. This new understanding makes Harry start to admire Malfoy's inner strength to resist, in a way, and he becomes a sort of 'fan' in the sense that he respects Malfoy more.
He could start by using magic in the kitchen. For example, he might use a spell to make the ingredients fly to the pan at just the right time. He could create unique dishes inspired by his Hogwarts experiences, like a potion - flavored soup. Maybe he'd open a wizard - themed restaurant where muggles and wizards alike could enjoy his magical cooking.
Well, maybe Harry Potter discovers superhero comics or movies in the wizarding world. He could start idolizing superheroes like Superman for his super strength and ability to fly. He might then try to incorporate some of their heroic traits into his own actions at Hogwarts, like being more openly brave and selfless in a way that's inspired by the superhero code.
One possible plot could be that Harry is bitten by a werewolf during one of his adventures outside of Hogwarts. He then has to struggle with his new identity as a werewolf. He might face discrimination from some in the wizarding world who fear werewolves. He could also try to find a way to control his transformations, perhaps with the help of his friends like Hermione who would research potions or spells to ease his condition.
Well, in this fanfiction, it could start with Harry being curious about Muggle technology. He might experiment on himself, perhaps with some ancient and powerful magical - technological artifact. This accidently fuses his body with mechanical parts, making him a cyborg. As a cyborg, he could then use his new abilities, such as being able to interface with magical devices in a whole new way, to uncover secrets in the wizarding world that were previously hidden.