One interesting scenario could be Harry traveling through the 'Philosopher's Stone' book again but with the knowledge he has from later in the series. He might be able to change some events to avoid certain dangers. Another could be him traveling into the 'Goblet of Fire' book and trying to figure out the mystery of the Triwizard Tournament before it fully unfolds. He could use his experience from the real events to his advantage.
In fanfictions where Harry Potter travels through books, there are numerous possibilities. For instance, when traveling into the 'Half - Blood Prince' book, Harry could have a different approach to dealing with Snape. He might be more understanding of Snape's true motives earlier on. Also, he could try to change the events that led to Dumbledore's death. He could use his knowledge of potions from his own time to create better antidotes or solutions to the problems that occurred during that part of the story. This would create a whole new narrative arc within the framework of the 'Half - Blood Prince' story.
One interesting scenario could be that the students in the Gryffindor common room gather around to read a really exciting fanfiction about Harry Potter in book 4. They might be laughing at the creative new adventures the author has written for Harry during the Triwizard Tournament.
One interesting scenario could be shopping for magical pets in Diagon Alley. In some fanfictions, characters might discover rare and unique creatures that are not typically found in the original books. For example, a magical hybrid of a phoenix and a cat that can both fly and purr.
Well, there are dueling scenarios where characters from different generations meet in a magical duel. For example, a character from Harry's time might accidentally travel back and duel with a student from the Marauders' era. This can lead to some really creative uses of magic as they try to outwit each other with different spells and strategies they've learned in their respective times.
One interesting scenario could be an OC who is a muggle - born wizard but has unique magical abilities not seen in regular wizards. For example, they might be able to communicate with magical creatures in a way that no one else can.
A common boggart scenario in fanfiction is related to the characters' insecurities. For Harry, it could be that the boggart shows him as the cause of all his friends' misfortunes, emphasizing his fear of being a burden or a danger to those he loves. This can add more depth to his character and explore his self - doubts further.
One interesting scenario could be when the characters are in detention and they discover a hidden magical object. For example, in some fanfictions, Harry and his friends might find an old, enchanted diary during detention in the castle. This diary could hold secrets or be a portal to another time or place.
One interesting 'last will' scenario could be a character leaving behind a powerful magical artifact in their will. For example, a wizard might leave a wand with special properties to Harry Potter, which could be a key to defeating a new dark force. This would add an extra layer of mystery and power to the story.
In some Harry Potter hospital fanfictions, there could be a scenario where a student gets injured during a Quidditch match and is rushed to the hospital wing. There, Madam Pomfrey uses her magic to heal the student in a very unique way, like using special potions that are not mentioned in the original books.
One character that would surely interact with Harry is Hagrid. Hagrid is always there for Harry in the main series, and in the fanfiction of traveling through books, he could introduce Harry to new magical creatures that are relevant to the specific book he has traveled into. Luna Lovegood could also be part of it. Her unique perspective on magic and the world could help Harry see things in a different light as he navigates through the different book - based scenarios. And then there's Ginny. Ginny, being Harry's love interest in the original series, would likely play an important role in the fanfiction, perhaps being involved in some of the adventures Harry has while traveling through the books.
A great scenario would be when they attend a magical - alien ball. The Doctor brings some of his alien friends, and Harry brings his wizard friends. There's a cultural exchange of sorts, with music from different planets and magical dances. They also end up having to solve a mystery during the ball as some valuable magical - alien artifacts go missing.