The idea of new magical creatures emerging or existing ones evolving in the post - apocalyptic world is also fascinating. Some creatures might have developed new abilities or behaviors due to the changed environment. And perhaps there are new threats from these evolved or new creatures that the wizards and witches have to face.
One interesting concept could be the rebuilding of Hogwarts. After an apocalyptic event, the once - great school might be in ruins. The remaining wizards and witches could come together to restore it, using their magic in creative ways. They might have to find new sources of magical energy or deal with dark magic that has been unleashed during the apocalypse.
Another concept is how the wizarding world interacts with the Muggle world post - apocalypse. Maybe the boundaries between the two worlds have been shattered, and they have to co - exist in a new way. For example, Muggles might start to learn about magic out of necessity, and wizards might have to use their magic more openly to help everyone survive.
One great post apocalyptic Harry Potter fanfiction is 'The Shattered World'. It presents a dark and desolate world after a magical cataclysm. The characters have to fight for survival in a way that's very different from the original series. Another one is 'Surviving the Ruins' which focuses on how the Hogwarts students band together against new and terrifying threats.
One idea could be that a dark magic spell has backfired and decimated the wizarding world. Harry and his friends, now much older, have to find a way to restore magic to its former glory. They might search for ancient artifacts that can reverse the damage.
Maybe Neville could be a central figure. He has always been strong and determined. In a post - apocalyptic world, his skills in Herbology could be extremely valuable. He could be in charge of finding or creating new plants that can provide food, medicine, or protection against the new threats in the world.
In post apocalyptic Harry Potter fanfiction, a common theme is the breakdown of the old order. Hogwarts might no longer be the safe haven it once was, and the Ministry of Magic could be in ruins. This forces the characters to create new systems and ways of living. Another theme is the discovery of new powers or abilities. With the world in chaos, some characters may find hidden strengths within themselves that they never knew existed before, which helps them in their fight for survival.
Some fanfictions in Harry Potter 2 might play with the idea of the basilisk having different powers or weaknesses. It could also explore the idea of a hidden connection between Ginny and the Chamber of Secrets that goes beyond what was in the original story. There might be fanfictions that change the role of certain characters, like making Neville a more central figure in solving the mystery of the Chamber.
One interesting concept could be exploring more about the Marauders' time at Hogwarts. Fanfiction might expand on their adventures, like pranks they played that were never mentioned in the original book. Another could be different interpretations of Sirius Black's escape and his relationship with Harry during that time.
The Potters might start a business in magical transportation. They could design and build new models of broomsticks or enchanted vehicles. This would require a great deal of knowledge in charms and transfiguration. They could also offer repair services for existing magical transportation devices.
A really interesting concept could be Lily Luna Potter traveling back in time. She could meet her father as a young boy at Hogwarts and have to be careful not to disrupt the timeline. It would be a great way to see how the past and present of the wizarding world interact.
A new generation of wizards and witches could be the main characters. For example, the children of Harry and his friends. They could inherit the legacies of their parents and at the same time, carve out their own identities as they struggle to survive and rebuild in a world that has been turned upside down.
Imagine a fanfic where Hagrid starts a baking club at Hogwarts. He tries to make giant cakes and cookies, but his recipes are a bit off. For example, he might accidentally use dragon eggs instead of chicken eggs, and the results are explosive. The students would be both terrified and amused by Hagrid's baking disasters.