In the future 'Harry Potter' fanfiction, the magical world could be on the verge of a technological - magical revolution. Magical devices are now integrated with Muggle - like technology. The new generation of witches and wizards, including those related to Harry, are at the forefront of this change. They have to balance the old magical traditions with the new advancements.
Perhaps some new students from different magical cultures. As the wizarding world expands in the future in fanfiction, students from far - flung magical communities come to Hogwarts. They could bring their own unique magic and customs, and interact with the legacy of Harry Potter in interesting ways.
In the future Harry Potter fanfiction, it could be that the relationship between the wizarding world and the Muggle world has changed drastically. There might be more cooperation, with Muggles being aware of some magic and wizards using Muggle technology in a magical way. This could lead to new adventures for the characters, like having to protect a new invention that combines magic and Muggle tech from falling into the wrong hands.
Harry could become even more of a wise and respected figure. His experiences with Voldemort would have made him a great teacher or mentor in the future, passing on his knowledge of dark magic and how to combat it. Hermione might be more experimental with magic, using her intelligence to break new boundaries in magical research. Ron could be more confident and a great support to Harry in his new role.
He could meet his future children, if he has any. They would likely be powerful wizards or witches with their own adventures. Also, he might run into the future versions of Hermione and Ron. They would probably be in important positions in the wizarding world, like Hermione might be a headmistress at Hogwarts or something.
He might meet the future versions of his friends like Hermione and Ron. Their children or grandchildren could be there, and they might have different personalities and magical skills compared to their predecessors.
There could be a book of ancient runes that holds the key to powerful spells. Another might be a tome about magical beasts, which gives Harry a better understanding of how to deal with them magically. And perhaps a book on forgotten magic arts that provides him with unique ways to use magic.
He'd first have to get used to the new technology. If there are new magical devices, he'd need to learn how to use them. For instance, if there are advanced wands with extra functions, it would take him some time to figure them out.
He might be shocked. In fanfiction, the future could be full of strange twists. For example, if his friends' children are involved in some wild adventures that are very different from what he expects. He would probably be confused at first, then curious to understand how things got to that point.
Harry would rely on his basic values. His loyalty and courage would still be his strong suits. He might join a group of young wizards who are working on some noble cause in the future magic world. Through interacting with them, he'd gradually understand the new rules and customs. For example, if there are new dueling regulations, he'd learn them in the process of joining friendly duels.