One interesting scenario could be when Harry uses his magic in a really unexpected and humorous way to troll his professors. For example, he might make Professor Snape's potions ingredients start dancing during a class, just to see Snape's reaction.
One interesting scenario could be Harry attending a wizarding ball in a dress. It would be a shock to his friends like Ron and Hermione. He might get strange looks at first, but then his confidence could win people over.
In 'harry potter shopping fanfic', there might be a situation where the characters go shopping for school supplies in a more mysterious part of Diagon Alley. They could discover a new shop that sells enchanted quills that write on their own, depending on what the user is thinking. And then there could be a hunt for the perfect spell - books, especially ones that are not on the regular Hogwarts curriculum. It would add a sense of adventure to their shopping spree.
One common detention scenario in Harry Potter fanfic could be having to clean the Forbidden Forest under the watchful eyes of Hagrid. The characters might encounter all sorts of magical creatures they've never seen before, like a rare breed of unicorn or a group of mischievous pixies. Another could be having to sort through a room full of old, cursed items in Filch's office, with the danger of accidentally triggering a curse.
In Harry Potter fanfic, boggart scenarios can be really creative. Consider a boggart that reflects a character's fear of failure. For example, Draco's boggart could be him failing to uphold his family's reputation. This would play into his insecurities. Then there could be a boggart that is related to a character's secret desires. Maybe Cho's boggart is Cedric coming back but not loving her anymore, which ties into her unresolved feelings about him. And for Seamus, his boggart might be not being able to perform magic at all, which is a fundamental part of his identity as a wizard.
Most likely, Harry Potter himself would be one of the main characters doing the trolling. Given that it's in the title, he's probably at the center of the humorous and mischievous actions.
One interesting scenario could be Harry using the staff to perform unique spells that are different from his usual wand magic. For example, he might be able to create large-scale protective shields with a single wave of the staff.
One interesting scenario could be when the bottle lands on two characters who have a long - standing rivalry in the Harry Potter world, like Draco and Harry. It forces them to interact in a way they never would have otherwise, perhaps leading to a new understanding between them.
One interesting scenario could be a battle where a character is severely injured (bloody) but still refuses to give in (unbowed). For example, Neville Longbottom facing a group of Death Eaters alone in a fanfic. He might be bloodied from their curses but stands his ground, showing his Gryffindor courage.
In some fanfics, the 'pranks bashing' might involve the teachers getting fed up with the constant pranks. So, they come up with their own clever ways to stop the students from pranking. Professor McGonagall could use her transfiguration skills to turn all the prank items into harmless objects. This would not only put an end to the chaos but also teach the students a lesson about respect for the school environment.
In 'harry potter love life fanfic', one interesting scenario could be Harry having a secret relationship with a character from a different house, like a Slytherin. This would create a lot of drama as they have to hide it from their friends who have pre - conceived notions about the Slytherins.