Imagine that a cursed magical object from a far - off land is brought to Hogwarts, and it spreads the zombie plague. The different houses in Hogwarts must put aside their rivalries and work together. The Gryffindors lead the charge in combat, the Ravenclaws search for a magical solution, the Hufflepuffs take care of the injured, and the Slytherins use their cunning to outwit the zombies.
Perhaps Voldemort's dark magic somehow triggers the zombie apocalypse. His Death Eaters initially think they can control the zombies but quickly lose control. Harry and his friends must then form an unlikely alliance with some of the remaining Death Eaters to stop the spread of the zombies and put an end to this new dark threat that is endangering both the wizarding and muggle worlds.
One idea could be that the Forbidden Forest becomes the breeding ground for the zombies. The magical creatures there are either zombified or in a fight for survival. Hogwarts students, led by Harry Potter, have to use both magic and their wits to fend off the undead hordes while also trying to find a cure within the castle's ancient secrets.
Maybe the apocalypse was caused by a dark magic experiment gone wrong. Now, Harry Potter's friends and family are scattered, and he has to journey across a desolate wizarding world to find them and also figure out how to reverse the damage. Along the way, he discovers new forms of magic that emerged as a result of the chaos.
One idea could be a gamer who uses their in - game survival skills to lead a group in the real - world zombie apocalypse. For example, they know how to scavenge for resources just like in the games they play.
One idea could be a group of survivors who are all musicians. They use their music to communicate with other groups across the apocalyptic landscape and also to keep their spirits up. Another could be a story where the zombies start to regain some of their humanity and the survivors have to decide whether to trust them or not. Maybe a story about a scientist in the group who is trying to find a cure using only the limited resources they have.
In some 'harry potter apocalypse fanfic' plots, there could be an invasion from another dimension full of dark and powerful creatures. This invasion could be the start of the apocalypse. Harry Potter and his allies would have to quickly learn about these new threats and find ways to defend the wizarding world. It might also involve a situation where the Ministry of Magic fails completely during the apocalypse, and it's up to the students and a few rogue wizards to save the day. They could discover new and hidden magics in the process of fighting for survival.
Maybe Voldemort somehow resurrects an army of zombie Death Eaters as a last - ditch effort to take over the wizarding world. But this time, the good side has to team up with some unexpected allies, like the giants and the house - elves, to defeat this new threat. The story could explore how different magical creatures react to the zombie apocalypse and how their unique abilities can be used in the fight.
One idea could be that the kids of South Park form their own survival squad. Cartman might try to hoard all the food, leading to comical in - squad conflicts. Another could be that the zombies are actually the result of a failed experiment by Professor Chaos, and the boys have to find a way to reverse it. Maybe Stan and Kyle have different ideas on how to deal with the zombie threat, with Stan being more practical and Kyle more idealistic.
One idea could be that the vampires in Twilight are immune to the zombie virus at first. But then they find out that the zombies are evolving and starting to pose a threat to them too. So they have to team up with the werewolves to fight the zombies. This would create an interesting dynamic as they have their own feuds but are forced to cooperate.
A great plot for a Potter Manor fanfiction could involve a mystery that surrounds the manor. For instance, strange noises at night lead Harry to uncover a long - forgotten chamber. It could also be about Harry restoring the manor to its former glory, perhaps with the help of Hermione's research on ancient magic used in the construction of such manors.
A traveler could be from a different magical realm entirely and come to the Harry Potter universe. They bring with them unique magical abilities that both fascinate and frighten the wizards in the Harry Potter world. This could lead to a series of adventures where they either share their knowledge or are hunted down by those who fear the new magic they possess.
One idea could be that Hecate, being the goddess of magic, takes Harry Potter under her wing secretly to teach him ancient and powerful magic that Dumbledore doesn't know. This could lead to Harry having new abilities to fight Voldemort.