One interesting plotline could be the discovery of Harry's connection to Merlin and how it affects his magic in ways not explored in the original series. For example, he might have access to ancient spells or a deeper understanding of magic's origin.
Some fanfictions might explore how being the heir of Merlin puts Harry in the middle of a power struggle within the wizarding world. Old wizarding families could either try to use him or eliminate him out of fear of his potential power.
Well, a cool plotline might be the conflict it creates within the wizarding world. Since Merlin and Morgana have such complex and often opposing legacies in the lore. Harry, as their heir, could be caught in the middle of different factions. One side might see him as a great hope for a new era of magic, while the other could view him as a threat to the existing power balance. Also, his relationship with the Ministry of Magic could change drastically as they try to either control or use his newfound connection to Merlin and Morgana.
In fem Harry Potter as the heir of Merlin fanfictions, an exciting plotline could be her journey to master the special magic associated with being Merlin's heir. This could involve her traveling to hidden places, like ancient Merlin - created magical sanctuaries. There, she might find artifacts or knowledge that help her grow in power. Also, there could be a plotline where she has to prove herself to the magical community. Since she's a female in a role that was perhaps expected to be male - dominated (as Merlin was male in the original lore), she has to overcome the prejudices of some of the old - fashioned wizards. This struggle for acceptance while also coming to terms with her new identity as the heir of Merlin can make for a really engaging story.
One interesting plotline could be the discovery of a new heir of Merlin within Hogwarts. This heir might possess unique magical abilities that are different from what we've seen in the original Harry Potter series. For example, they could have the power to control time in a more profound way than just using a Time - Turner.
One interesting plotline could be Harry exploring his new role as an heir and the powers or responsibilities that come with it. Maybe he discovers hidden family secrets or a new form of magic.
Another plotline could be that the powerful heir is initially hidden among the normal students at Hogwarts. As they gradually discover their powers, they form unexpected alliances. For example, they might team up with some of the less popular characters in the original series. Their power could also be something that is not just magical but also has an impact on the political structure of the wizarding world, like being able to change laws or traditions with their sheer might, which would surely stir up a lot of drama.
One interesting plotline could be how the magical world of Harry Potter intersects with the Roman heritage. Maybe the heir of Rome has some ancient Roman magic that is unique and helps in the fight against Voldemort. For example, they might have the ability to use Roman battle spells or have a connection to Roman gods in a magical way.
Another plotline could involve the relationship between Harry and the wizarding world's reaction to his new status. Some might see him as a greater threat to Voldemort, while others might fear his new - found power. There could be a power struggle within Hogwarts as different factions vie for Harry's allegiance.
Well, perhaps there's a plotline where the heir of Anubis has to prove their heritage in the context of Hogwarts. They could face challenges from other students or even some of the professors who are skeptical. And as they try to prove themselves, they uncover secrets about the school that are related to Anubis, like hidden chambers or ancient spells that were once used by the previous heirs.
One interesting plotline could be the discovery of the Heir of Ravenclaw's special powers. Maybe they can access hidden knowledge in the Ravenclaw common room that no one else can. Another could be the heir's relationship with Harry Potter, perhaps they team up to face a new dark threat.
One interesting plotline could be the discovery of new magical abilities related to being the heir of God. For example, the character might be able to perform magic that is far beyond what normal wizards can do, like controlling natural elements in a much more powerful way. Maybe they can stop a raging storm or make plants grow instantly on a large scale.