Well, it could be that in the fanfic, Harry Potter uses his magic skills to protect the Queen from dark wizards who are plotting against her. Maybe he creates a powerful protective shield around the palace.
The plot could involve a time - travel element. Harry Potter travels back in time to a period when the Queen is in great danger. He teams up with some of the Queen's guards who are aware of magic. Together, they face off against an evil wizard who wants to take over the kingdom. Harry uses his knowledge of Hogwarts magic and the Queen's resources to mount a great defense.
In this fanfiction, perhaps Voldemort is after some powerful magical artifacts stored in Gringotts. Harry, being the hero, steps in. He might have to face various challenges like dark magic traps and dangerous creatures inside the bank while trying to keep it safe. He could also form an alliance with the goblins, who are initially skeptical of him, but then see his determination to protect their precious bank.
Maybe Harry discovers that the goblins are being wrongly accused of something in the wizarding world, like being framed for a theft in Gringotts. So he decides to use his influence and skills to defend them, showing that not all goblins are bad and that they have been misjudged.
In addition to the main ones, there could be some original characters created for this fanfiction. For example, a wizard who is secretly working for the Queen's enemies. There might also be some magical animals that are either helping Harry or causing trouble. And of course, the Queen's advisers and guards would be part of the story as they interact with Harry and the magical world.
In 'harry potter the queen guardian fanfiction', it may show the Queen as a guardian of magical creatures. She could be in charge of protecting thestrals, for instance. Thestrals are quite unique and important in the Harry Potter world. The Queen might be using her influence and some special magical abilities to keep their habitats safe. This could also involve her having to deal with poachers or those who want to use thestrals for dark magic. Harry Potter and his friends could get involved in this situation too, either by accident or because they are asked to help by the Queen.
One possibility could be that in an alternate magical universe, Harry Potter, after all his adventures at Hogwarts and defeating Voldemort, travels to a different realm where he meets a queen. Maybe the queen is facing some magical threats in her kingdom and Harry, with his powerful magic, offers to help. As they work together, they fall in love and decide to get married. Their union could then bring about a new era of peace and cooperation between the wizarding world and the queen's non - magical kingdom.
Well, it might be that Harry Potter is accidentally transported to a non - magical realm where he is in trouble because he doesn't understand the Muggle world completely. The Queen, who has some knowledge of magic or is in contact with a secret magical society, discovers Harry and saves him from the perils of this strange new world for him.
Perhaps in this fanfiction, Harry Potter is recruited by the queen to solve some magical mysteries within the palace. He could use his knowledge of the wizarding world to uncover secrets that are plaguing the monarchy. For example, there might be a cursed object in the palace that is causing strange happenings, and Harry is the only one who can find and break the curse.
One possible plot could be that the Queen is in danger from dark wizards who want to take over the Muggle government. Harry, using his skills from Hogwarts, discovers the plot and uses magic to protect the Queen. He might use spells like Protego Maxima around Buckingham Palace.
Well, it could be about the Queen of England being a secret witch and having a connection to the wizarding world of Harry Potter. Maybe she helps Hogwarts in some way during a crisis, like providing a safe haven on the castle grounds that are protected by magic and Muggle secrecy charms at the same time.
One possible plot could be that dark wizards are planning to use Queen Elizabeth as a symbol to gain power in the Muggle world. Harry Potter, being the hero, gets wind of this plot and uses his magic to secretly protect her. He could use spells like the Fidelius Charm to keep her location hidden from the dark wizards.