Well, in a lot of such fanfictions, Harry often takes on an even greater role as the guardian. He might have to face new and more powerful dark forces threatening Hogwarts. Maybe he discovers some long - lost magic or forms new alliances within the school to protect it.
Obviously, Harry Potter is the main character. He is the one taking on the role of the guardian. Hermione and Ron usually play important supporting roles as well. They help Harry in his mission to protect Hogwarts with their knowledge and skills.
One possible plot could be that Harry Potter, as the new owner of Hogwarts, decides to reform the school's curriculum. He might introduce new magic subjects that were previously overlooked, like ancient rune magic for practical applications.
Perhaps Harry is teaching Potions in the fanfiction. Since he had a bit of a rocky start with Potions in his student days, he could be a very understanding teacher. He might encourage students to experiment more, which is different from Snape's strict methods. He could also share stories about how important Potions were in his adventures, like when they made Polyjuice Potion. This would make the class more interesting and inspire students to take Potions more seriously.
Well, it could be about Harry's journey to fully embrace his role as a prince in Hogwarts. Maybe he discovers some long - lost royal heritage of the wizarding world that gives him new powers and responsibilities.
Well, perhaps the plot could involve Harry using his newfound powers to bring about major reforms in Hogwarts. He might control the curriculum to include more practical magic for real - world situations.
One possible plot could be that Harry travels back in time to become the founder. He uses his knowledge of future dark wizards to set up defenses in Hogwarts. For example, he could create a special chamber to hide something crucial, just like the Chamber of Secrets, but with a different purpose.
In this fanfiction, perhaps Harry decides to renovate Hogwarts. He could add new sections for different types of magic study, like a special wing for time - traveling magic research. Also, as the owner, he'd have to deal with the political aspects of the wizarding world trying to influence the school's curriculum.
One possible plot could be that Harry, as the 'King of Hogwarts', uses his new - found status to reform the school's rules. He could make the houses work together more closely, perhaps by creating new inter - house competitions that focus on cooperation rather than competition. For example, a magical scavenger hunt where students from all houses must team up to find hidden magical artifacts around Hogwarts and its grounds.
One possible plot could be that Harry discovers Death as his guardian early on. Maybe Death protects him from Voldemort's initial attacks in a more direct way than in the original story. For example, when Voldemort tries to kill Harry as a baby, Death could appear as a shadowy figure and deflect the Killing Curse in a more obvious display of power.
It could be that there's a powerful enemy that has taken over Hogwarts and Harry, in a desperate attempt to stop this evil from spreading, resorts to destroying the school. He might think that rebuilding it later is better than allowing it to be used for evil purposes. For example, if Voldemort had found a way to permanently taint the magic of Hogwarts, Harry might see destruction as the only option.