One interesting plotline could be Harry mastering new and powerful magic that was not explored in the original books. For example, he might discover a long - lost spellcasting technique. Another could be his relationships with other characters evolving in different ways, like a deeper friendship with Neville or a different kind of mentorship with McGonagall.
Well, some fanfictions might have a plotline where Harry, as the master of Hogwarts, has to deal with a new dark threat that is more insidious than Voldemort. He could be using his unique position to reform Hogwarts' curriculum to better prepare students for all kinds of threats. Maybe he starts a new club that focuses on advanced defensive magic.
A possible plotline could be that Hogwarts itself becomes a sort of magical battleground earlier than expected. The Death Eaters try to take over the school completely, and the students and remaining teachers have to fight back in a sort of guerilla warfare within the castle walls. This would change the whole dynamic of the seventh year, with classes being interrupted and students having to use their magic in real - life combat situations.
One interesting plotline could be exploring how the blood wards affect characters other than Harry. For example, how they might impact students who have a connection to dark magic in their family history but are still good at heart. Maybe they experience strange phenomena around the wards. Another could be about the origin of the blood wards and a fanfiction could delve deeper into the magic and rituals that created them in the first place.
One possible plotline could be students trying to figure out the cause of the lockdown while also dealing with their own personal issues. For example, Harry might be worried about Voldemort still being a threat even within the locked - down Hogwarts. Another could be the formation of secret groups among students to find ways to break the lockdown rules in order to get supplies or communicate with the outside world. Maybe Hermione would be part of a group that tries to use magic in innovative ways to bypass the lockdown restrictions.
Perhaps a plot where Harry uses his mastery of snakes to uncover ancient secrets in Hogwarts. He could find hidden passages or long - forgotten magic related to snakes that no one else knew about. This would not only add to his own power but also change the dynamics of the wizarding world as they know it.
In some fanfictions, Harry's mastery of illusions might lead to him being able to enter people's dreams and manipulate them. He could use this power to either help his friends overcome their fears or to gather information from the enemy. However, he would also have to face the moral implications of such actions.
One interesting plotline could be Harry fully exploring and mastering the powers that come with being the Master of Death. He might use these powers to reshape the wizarding world in ways that were not possible before, like eradicating dark magic at its source.
One interesting plotline could be Harry discovering ancient magic secrets related to his status as heir. Maybe he finds a hidden chamber in Hogwarts that only the heir can access, filled with powerful spells and artifacts.
Well, perhaps a plotline where Harry has to deal with a new dark threat that is targeting Hogwarts specifically. As headmaster, he would use his knowledge of the Dark Arts and his friends' expertise to protect the school. He could also start new traditions at Hogwarts to boost the morale of students and staff alike.
One possible plotline could be that Harry initially resists going to Hogwarts because he's afraid of leaving behind his only connection to his normal life, like his aunt and uncle's house which, despite being horrible, is still the only home he's known. Another could be that some dark force is trying to prevent him from going to Hogwarts, but he's being forced by Dumbledore or some other powerful figure who knows it's crucial for his safety and development. For example, Voldemort could be using some magic to make Harry not want to go, in an attempt to keep him from learning magic and becoming a threat.
One possible plotline could be Harry exploring the full extent of his newfound power as the Master of Death. He might use it to bring back loved ones in a way that doesn't disrupt the balance of the wizarding world. Another could be that he faces new and more powerful enemies who are threatened by his status.