There might be a fanfiction where a Demiguise forms an unlikely bond with a Hogwarts student. In this story, the Demiguise could use its powers to help the student solve a series of mysterious events that are occurring within the school walls. For example, it could lead the student to hidden passages or warn them of impending danger. This would not only showcase the Demiguise's unique abilities but also the friendship that can form between different magical creatures and wizards.
Another place to find such fanfiction is FanFiction.net. There are many dedicated Harry Potter fans on there who write about different aspects of the wizarding world, including the Demiguise. Browse through the Harry Potter section and keep an eye out for stories that mention the Demiguise in the title or summary.
It could be a new dark wizard who wants to make a name for himself. He sees Hogsmeade as an easy target to show his power. He starts by causing small disruptions like making objects in the shops move on their own and then escalates to more dangerous attacks that Harry has to stop.
One possible consequence could be a lot of chaos and panic among the students and residents. With Hogsmeade being a popular place for Hogwarts students to visit, an attack would surely terrify them. Some students might get separated from their friends or get injured. The safety of Hogwarts itself could also be in jeopardy as Hogsmeade is so close. The local businesses in Hogsmeade would likely suffer great losses, and it might take a long time for the place to recover its former charm and prosperity.
Luna Lovegood could play a supporting role. She might be in Hogsmeade looking for some strange and wonderful creatures that she's heard about. She could then join Harry and Ginny on their little excursions, sharing her unique insights and knowledge. Fred and George Weasley could also be involved. They might be testing out their new products in their Hogsmeade shop, and Harry and Ginny get to be the first customers or guinea pigs for their latest magical inventions.
One interesting plotline could be Harry and Ginny having a secret date in Hogsmeade. They might discover a hidden alley with a magical shop that holds a key to solving a mystery at Hogwarts. Another could be that they encounter a strange creature near Hogsmeade and have to work together to keep it from causing chaos in the village. And also, perhaps they meet an old wizard in Hogsmeade who tells them a prophecy about their future together.
Well, perhaps in the fanfiction, Harry could be protecting Hogsmeade from a group of dark wizards who are trying to steal some powerful magical artifacts hidden in the village. He might use his Patronus charm to fend them off and rally the villagers to fight back.
It could be the Death Eaters. They are always looking for ways to cause chaos and undermine the wizarding world. Hogsmeade, being a place full of both students and ordinary wizards, would be a prime target for them to strike fear into the hearts of everyone. Another possibility could be some rogue dark wizards who are not directly affiliated with Voldemort but have their own evil agendas.
Well, Hermione might immediately say yes. She loves going to Hogsmeade and exploring all the magical places there. Once they get there, they could start by going to the bookshop. Hermione would be in her element, looking for new and rare magical books. Harry would probably follow along, maybe a bit less enthusiastic but still interested in whatever Hermione might find interesting.