One idea could be that the Royal Marines are called in to help Hogwarts during a major attack. They use their military tactics along with magic to fend off the dark forces. Maybe they train the students in some non - magical combat skills too.
In a Harry Potter Royal Wedding fanfiction, it could be that the royal family is from a different magical country. The wedding is a political alliance as well as a union of love. Harry Potter is sent as an ambassador from Hogwarts. The wedding preparations could be filled with magical mishaps, like spells going wrong for the decorations. And during the wedding, a long - lost magical artifact is revealed, which has significance for both the royal family and the wizarding world at large. Harry then has to figure out how to handle this new discovery.
One idea could be that the Royal Wizards have a secret society within Hogwarts that Harry discovers. They have ancient spells and knowledge that could help him in his fight against Voldemort.
One interesting idea could be a story where the wizarding world has a royal family and they interact with Harry Potter. For example, perhaps Harry discovers he has some long - lost royal blood and has to navigate the politics of both the wizarding court and Hogwarts. Another idea might be a royal from a different magical kingdom visits Hogwarts and forms a friendship or rivalry with Harry.
One possible plotline could be Harry's journey to become a Royal Marine, facing all the tough training. Maybe he overcomes his own fears and insecurities during the process.
Well, a great plot for a Royal Ward Harry Potter fanfic could involve Harry being sent to the Royal Ward for protection. While there, he uncovers a plot by dark wizards who are using the secrecy of the Ward to plan an attack on Hogwarts. He then has to use his skills and the help of new friends he makes in the Ward, like a healer - in - training who has a special gift for seeing the future through potions. They work together to stop the dark wizards and in the process, Harry learns more about his own family's connection to the Royal Ward.
Another plot could involve a member of the royal family in the Muggle world being a Squib. This person, desperate to be part of the magical world, tries to find a way to regain their magic through the help of the Potter family. The story could then revolve around the secrecy that needs to be maintained while also trying to help this person, and how it affects the relationship between the wizarding and Muggle royal families.
Harry Potter himself could be one of the main characters. He could interact with the Royal Marines, learning from their discipline and sharing his magical knowledge. Another could be a tough Royal Marine sergeant who has to adapt to the magical world.
A great plot for a Potter Manor fanfiction could involve a mystery that surrounds the manor. For instance, strange noises at night lead Harry to uncover a long - forgotten chamber. It could also be about Harry restoring the manor to its former glory, perhaps with the help of Hermione's research on ancient magic used in the construction of such manors.
One possible plot could be that the Royal Family discovers the wizarding world through Harry Potter. Maybe a young royal is a Muggle - born wizard and Harry has to help them adjust to Hogwarts life while also dealing with the media frenzy that ensues when the connection between the Royal Family and the wizarding world is revealed.
One idea could be a commoner unexpectedly falling in love with a royal and getting engaged. For example, a young artist who meets the prince at an art exhibition and they bond over their shared love for creativity. Then, they have to face the challenges of different social classes and the public eye.