One idea could be about Harry starting his own school of magic. He could combine the best of Hogwarts with new and innovative ways of teaching magic, like including Muggle technology in some lessons. Another idea is a fanfic focusing on Hermione's work in the Ministry of Magic, perhaps she's in charge of reforming some archaic laws regarding house - elves. A third idea might be a story about Ron and Neville opening a magical joke shop together, filled with all kinds of hilarious and magical prank items.
Harry Potter himself is often very popular. Fans like to see his life after Hogwarts, whether he's becoming an Auror or taking on other important roles. Hermione Granger is also a favorite. People love to explore her continued growth and her impact on the wizarding world. And Draco Malfoy is quite popular too. His potential for redemption and his complex character make him an interesting subject for post - Hogwarts fanfics.
One great post - Hogwarts fanfiction is 'The Cursed Child' - inspired ones. They often explore the characters' lives after they've left Hogwarts, dealing with the aftermath of the war. Another is those that focus on Harry's life as an Auror, like 'Harry Potter: Auror Years'. These fanfictions usually show his adventures in the wizarding world while he tries to keep it safe.
One great post - Hogwarts Harry Potter fanfiction is 'The Changeling' which explores Harry's life as he deals with the after - effects of the war and tries to build a new magical world order. Another is 'The Unseen Potter' that focuses on Harry's secret adventures away from the public eye.
Some fanfictions explore Ron's life as he tries to balance his family life with his career in the wizarding world. He might be working in Weasley's Wizard Wheezes while also dealing with the chaos of having a large family. There could be stories where he has to come up with new products for the shop while also helping his kids with their magic studies.
In the fanfic, Harry Potter could meet the new generation of students. They would be in awe of him. He might also encounter some of the ghosts, like Nearly Headless Nick, who would surely have some interesting stories to share since Harry left. And there's a good chance he'll meet the caretaker, who would probably give him a hard time about coming back and causing a stir. Moreover, he could cross paths with some of the older students who idolize him and want to learn from his experiences.
Luna Lovegood could be a main focus. Her unique perspective on magic could be used to discover new magical phenomena that emerged after the battle. She might also be helping the other students deal with their post - battle stress, using her calm and dreamy nature to soothe them.
Well, a plotline might revolve around the new relationships that form. For example, Neville could start a herbology club and meet a new love interest who is also passionate about plants. Also, the wizarding world might see some political changes. Maybe there would be a new Ministry of Magic with more inclusive policies after the dark times of Voldemort's regime.
You can also check out some Harry Potter - focused forums and communities. There are often members who share their own fanfiction or recommend stories they've read. Reddit has some Harry Potter subreddits where fans discuss and share fanfiction, and you might be able to find some great post - Hogwarts stories there.
It might be significant as it shows the deep engagement of fans with the Hogwarts setting. By reading fanfic set in Hogwarts, they can further immerse themselves in the magical world, experiencing different scenarios, relationships, and adventures that are created by fellow fans.