The Weasley family has a good chance of survival. They are a large and resourceful family. Ron, with his loyalty and experience in facing danger alongside Harry, would be tough to take down. Fred and George's creativity with magic could be used to create all sorts of zombie - deterring gadgets. Ginny is also a skilled witch and not one to back down from a fight.
Definitely Harry Potter himself. He has faced so many dark and dangerous things already, so he'd be able to handle zombies. Hermione would also be a likely survivor. Her vast knowledge of magic and quick thinking would serve her well. And Neville Longbottom. He has shown great courage and has a deep understanding of Herbology, which could be useful in creating defenses or finding antidotes.
The teachers at Hogwarts would be likely survivors too. Professor McGonagall could transform into a cat and escape danger when needed, and use her powerful magic to protect the students. Professor Snape, with his knowledge of potions, might be able to brew something to either repel or cure the zombies. And Hagrid, with his strength and connection to the magical creatures, could provide valuable assistance in this apocalyptic situation.
The members of Team JNPR could also be likely survivors. Jaune has grown a lot in his skills. His leadership and swordsmanship could be useful. Pyrrha, if she were still alive in this fanfic scenario, would be a great asset with her combat abilities. Ren's calm and collected nature, along with his stealth and combat skills, would help him survive. And Nora, as mentioned before, would be a great addition to the group of survivors. They could work together with Team RWBY to face the zombie apocalypse.
Harry Potter himself would be a likely hero. He has already faced Voldemort and numerous other dark threats, so he has the courage and experience. His ability to think on his feet and his connection to the powerful Patronus charm could be very useful against the zombies.
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.
Obviously, Harry Potter himself is a likely hero. His experience in fighting Voldemort has given him the skills and courage to face new apocalyptic threats. Hermione Granger is also a strong candidate. Her intelligence and vast knowledge of magic would be invaluable in trying to solve the problems causing the apocalypse. Ron Weasley, with his loyalty and ability to think on his feet, would be right there beside them, fighting against whatever doom is approaching.
Well, the wizards would surely have some unique ways to deal with zombies. For example, they could use spells like 'Incendio' to set the zombies on fire. And the protective charms around Hogwarts might keep the zombies out at first. The students would probably be trained to fight them in Defense Against the Dark Arts classes.
The Hogwarts students would adapt in different ways. The Gryffindors would be eager to jump into the fight, while the Ravenclaws might be more focused on finding solutions through research. The Hufflepuffs would help those affected by the apocalypse, and the Slytherins, well, some might try to use the situation to their advantage, but others would also fight for the survival of the wizarding world. The teachers would have to protect the students while also teaching them how to defend against zombies.
It could involve crazy chases with zombies in colorful settings. Maybe there'd be heroic characters using funny weapons to fight them off.
Stan could be a likely hero. He's often the voice of reason in the show. He would probably be the one to come up with a practical plan to survive the zombie apocalypse, like finding a secure place to hide and stockpile supplies. He also has a strong moral compass which would help him make decisions about whether to help other survivors or not.
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.
The younger students at Hogwarts are quite likely to read Harry Potter fanfiction. They are at an age where they are really into the wizarding world and would be curious about different interpretations. Students like Colin Creevey, who is a big fan of Harry, might be eager to read fan - created stories about his hero. Also, the members of Dumbledore's Army, such as Luna Lovegood and Neville Longbottom, seem like the types who would be open to exploring fanfiction.