Well, it could be that the queen summons Harry Potter because she has somehow learned about the existence of the wizarding world and needs his help. It could be to deal with a magical threat that has seeped into the Muggle realm. Harry would then have to figure out how to use his magic in a Muggle - dominated place while also respecting the queen's authority.
In this fanfiction, perhaps Harry Potter would be in a state of great confusion when summoned by the queen. He might initially think it's some kind of dark magic trick. Maybe he'd be worried about leaving his wizarding world duties behind. And he'd likely be very curious about the Muggle royalty.
Well, perhaps Harry could face unexpected magical challenges. The Goblet might summon him for a task that is far more dangerous than the Triwizard Tournament in the original story.
One interesting plot in this kind of fanfiction could be that the Goblet of Fire is actually under some dark magic influence. Harry, being summoned, discovers this conspiracy. He then has to not only deal with the Triwizard Tournament tasks but also find a way to break the dark magic's hold on the Goblet. This could involve him delving deeper into ancient magic lore and seeking help from the Forbidden Forest's creatures that are often overlooked in the original story.
Well, it could be that the Queen, being a symbol of order in the Muggle world, has to deal with the sudden appearance of Harry Potter and the chaos that magic can bring. Maybe she initially mistakes his magic for some sort of advanced technology and there are a series of misunderstandings that lead to an interesting adventure. Harry could introduce her to the concept of Hogwarts and she might be fascinated by the idea of a school for magic.
In this fanfiction scenario, Harry could bring a touch of magic to the royal court. He might introduce some magical creatures to the royal gardens, like a friendly unicorn or some magical birds. His Gryffindor courage would make him stand out in royal events, and he could inspire the younger members of the royal family to be more brave and adventurous. Also, his experience with fighting dark wizards could be applied to protecting the Queen from any potential threats, magical or not.
Well, he might use his magic to show the Queen some amazing things. Maybe he'd conjure up a beautiful display of Hogwarts' magic, like floating candles or flying books. And the Queen would be both surprised and fascinated.
He might encounter different versions of his friends and enemies. For example, a more evil Voldemort or a kinder Snape. He could also discover new magical abilities or objects that don't exist in his original universe.
When Harry is summoned by Naruto fanfiction, it's likely that he would be a fish out of water. He would encounter characters like Naruto, Sasuke, and Sakura. His magic skills could be seen as a new form of power in that world. He might get involved in the battles between the ninja villages, using his own unique abilities to help or cause chaos, depending on how the story is written.
Maybe he is summoned to receive special training. The Order could have found a new way to enhance his magical abilities, like teaching him some ancient and powerful spells that can be used against the Dark Arts. It would be a great opportunity for Harry to grow stronger.
Well, he might face some unexpected challenges. In fanfiction, the author could take the plot in all kinds of directions. Maybe he'll be forced into a dangerous tournament that's even more perilous than in the original story. He could encounter new magical creatures or spells that are unique to this fan - created scenario.
Well, perhaps Harry Potter could use his magic to solve some sort of mystery in the Queen's palace. Maybe he'd help protect a valuable magical artifact that was in the Queen's possession without her knowledge of its true nature.