It might also be about the rebuilt Hogwarts. Ten years later, Hogwarts could have new magical defenses, new teachers, and new areas of study. The story could follow a new student or an old character who returns to teach. There could be new magical creatures discovered on the Hogwarts grounds and adventures that come with exploring them.
It could be about Harry, Ron and Hermione's careers. Maybe Harry is now a high - ranking Auror, leading teams to fight the remaining dark wizards. Ron could be running Weasley's Wizard Wheezes successfully, and Hermione might be making great changes in the Ministry of Magic with her intelligence.
Perhaps it focuses on the next generation. Their children are starting at Hogwarts. The story could explore how they deal with the legacy of their famous parents. Are they under pressure? Do they have their own unique magical abilities that set them apart? There could be new friendships and rivalries among them, just like their parents had.
In '19 years later' in Harry Potter fanfiction, we might see the next generation of wizards at Hogwarts. Harry's kids could be getting into all sorts of adventures, just like he did. Maybe they'd be facing new threats to the wizarding world.
One possible storyline could be the children of the original characters starting their own adventures at Hogwarts. They might face new threats that are related to the past but in a different way. For example, a new dark wizard could be trying to revive the ideas of Voldemort and the kids have to stop it using the knowledge passed down from their parents.
The relationship between wizards and Muggles could be entirely different. Maybe after a thousand years, there is no more secrecy, and wizards and Muggles live together in harmony, with wizards using their magic to help improve Muggle technology and vice versa.
The children of Harry, Ron, and Hermione would likely be main characters. For instance, Harry's son could inherit his father's courage and be at the center of a new mystery. He might have to deal with the high expectations placed on him because of his father's legacy.
Hermione Granger would be a likely main character. She has always been a central figure. Maybe she's working on some revolutionary magical research or is involved in political reforms in the wizarding world. Her relationship with Ron and their family life could also be part of the story.
Well, in this 'Harry Potter 19 Years Later Fanfic', it could explore the relationships between the characters more deeply. For example, how Harry and Ginny's marriage has developed over the years and how they are raising their children. It might also show how the wizarding world has changed in those 19 years, like new spells being introduced or changes in the Hogwarts curriculum.
Perhaps in a 'Twenty Years Later' Harry Potter fanfic, the wizarding world has finally achieved some sort of official relationship with the Muggle government. Wizards are now allowed to use magic more openly in certain Muggle areas for the common good. Harry, Ron, and Hermione could be in high - level positions in the Ministry of Magic, working on policies to improve the lives of all wizards and witches. The Forbidden Forest could have been turned into a magical reserve where students go for advanced studies in magical creatures. And Neville could be the head of Herbology at Hogwarts, teaching a new generation of students about the importance of plants in magic.
Obviously, the children of the original characters like James, Albus, and Lily Potter. They are likely to be at the center of many stories as they navigate Hogwarts life. Also, Scorpius Malfoy as he is the son of Draco Malfoy and his story could be intertwined with the Potters.
In some fanfictions, Harry might become a very influential Auror, traveling around the wizarding world to fight dark magic remnants. He could also be involved in reforming the Ministry of Magic, ensuring fairness and equality for all magical beings.
Well, some fanfictions might focus on the magical education system evolving over the 19 years. Maybe there are new subjects being introduced at Hogwarts. Also, the friendship dynamics among the new generation of students could be a great plotline. For example, how they form inter - house friendships which were not as common in the past.