It could be that Harry is fated to become a death god - like figure. He starts to have visions of a realm between life and death, and as he delves deeper into this new aspect of his magical nature, he has to make choices that will either lead the wizarding world into a new era of understanding death or plunge it into chaos. His friends, like Hermione and Ron, would be both intrigued and worried about his transformation.
Perhaps in this fanfiction, the Deathly Hallows are actually linked to the idea of the death god. Harry could find out that the Elder Wand is a tool of the death god, used not just for power but for some sort of death - related magic on a grand scale. The Resurrection Stone might have a deeper meaning related to the death god's realm, and the Invisibility Cloak could be a way to move unseen in the presence of death - related entities.
One possible plotline could be that Harry Potter discovers a new side of Fem Death that is not as menacing as she is often portrayed. Their relationship could start with a mutual curiosity and gradually turn into love as they get to know each other better.
One possible plotline could be that Harry discovers a hidden family connection to the Death Eaters. Maybe his real parents were involved in some dark magic and he starts to explore this side of his heritage, which gradually makes him more sympathetic to the Death Eaters. Another could be that he is tricked by a powerful dark wizard into believing that the Death Eaters' goals are actually good for the wizarding world, so he starts working with them secretly.
One possible plotline could be that Harry discovers his new 'God of Destruction' powers gradually. At first, he's scared and confused by them. But as he learns to control them, he uses them to fight against a new, even more powerful dark force that threatens the wizarding world and the Muggle world alike.
Perhaps Harry discovers that he has basilisk blood in him. This could change his abilities and how others view him. He might face discrimination from some in the wizarding world who fear the basilisk's power, while others might see him as a potential weapon against Voldemort. The plot could revolve around Harry coming to terms with this new aspect of himself.
One possible plotline could be that Harry, as a cyborg, uses his mechanical abilities to enhance his magic. For example, he might have a built - in spell - enhancer in his robotic parts that allows him to cast more powerful spells. Another could be that he has to hide his cyborg nature from the wizarding world at first, fearing they will reject him, but then uses it to fight a new kind of dark force that is immune to normal magic.
One possible plotline could be that the wizarding world has its own version of cops. Harry Potter and his friends could join this force and use their magic to solve magical crimes that the regular Aurors can't handle. For example, they might deal with dark wizards who are using new and undetectable forms of dark magic.
A plotline could involve an Uchiha character from the Naruto world being sent to the Harry Potter universe. This Uchiha could befriend Harry and teach him some of the Uchiha techniques, like how to enhance his senses or use some basic ninjutsu. Harry, in turn, could introduce the Uchiha to magic. Together, they could face threats in the wizarding world, like a new dark wizard who is immune to normal magic but vulnerable to ninja techniques.
One possible plotline could be Harry using his newfound baron status to reform the wizarding world's social structure. He might try to bring more equality among pure - bloods, half - bloods, and Muggle - borns. Another could be him having to deal with the political intrigue that comes with being a baron, like rivalries with other noble wizarding families.
Maybe Harry, as a politician, has to deal with the aftermath of the war. He could be trying to unite different factions within the wizarding community that were divided during the battle against Voldemort. He might face opposition from traditionalist wizards who don't want to see the changes he is proposing, such as equal rights for house - elves or better integration of muggle - borns into the wizarding society. And he would have to use his charm and the respect he has earned from his heroic deeds to convince others to support his political agenda.
Well, perhaps there could be a plot where the virus is actually a dark magic - created plague. The Ministry of Magic is in chaos as they try to deal with it, and it's up to Hermione to research and find a solution using her vast knowledge of magic. Or maybe the virus is spreading among the Muggle - borns first, and Ron has to deal with his family's concerns while also trying to help his Muggle - born friends. There are many directions it could go depending on the creativity of the author.