A member of the royal family could be a main character as well. For example, a young prince or princess who discovers their magical abilities or is drawn into the wizarding world. They would have to learn to balance their royal duties with their newfound magical identity. And then there could be a wizard or witch who acts as a guide for this royal person, like a Hogwarts professor or an Auror.
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.
In such a fanfiction, Harry Potter might gain a whole new level of status and protection. He could be trained in royal etiquette and have access to resources that Hogwarts couldn't provide. Maybe he'd use his magic to solve some royal family mysteries or protect them from dark magic threats.
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.
Obviously, Harry Potter himself would be a main character. And then perhaps Prince William or Prince Harry could be important characters too. They could be the ones who bridge the gap between the Royal Family and the wizarding world. Hermione and Ron might also be involved, helping Harry to deal with the unique situation of the Royal Family in the wizarding world.
Well, he would probably bring his magic skills into play. He could use spells to enhance the security of the Royal Guard. For example, he might cast protective charms around the royal palace that are far more powerful than any muggle security system. His broomstick flying skills could also be useful for quick patrols or emergency responses. He'd be a very unique addition to the Guard, that's for sure.
Harry Potter is surely a main character as he is the one making the call. As for the royal guard, there could be a leader among them who becomes a central figure. Also, Dumbledore might still play an important role in the fanfic. He could be the one who gives Harry the idea or helps him deal with the implications of bringing in the royal guard. Hermione and Ron would probably be around to support Harry and offer their unique perspectives on the situation.
Well, it could be that Harry Potter has no other option but to call in the royal guard in the fanfic. They might be brought in to help protect the wizarding world from an external non - wizard threat. The royal guard could introduce new forms of discipline and strategy that the wizards would need to adapt to.
In Harry Potter fanfic focusing on the strength of family, it often shows how different families' values shape the characters. For example, the Weasley family's strong bond gives its members a sense of security and belonging. Their family dinners, full of laughter and warmth, are a vivid portrayal of family strength. Family in these fanfics can also be a source of power for the characters in difficult times, like when they face dark wizards.
It's a bit of a stretch to call it a royal fanfiction. There are some aspects that could be tenuously related to royalty, such as the Weasley family's long - standing place in the wizarding world, but it's not the main focus. The series is mainly about friendship, courage, and the battle between good and evil. The magic, the magical creatures, and the different spells are what really define the series, not any sort of royal - inspired themes.