One possible plot could be that Harry discovers a hidden dance chamber in Hogwarts. Inside, he finds ancient spells that are activated through dance. So he starts learning the dances to unlock the magic within. Another could be that he is entered into a magical dance competition against students from other wizarding schools.
The plot could involve a new dark wizard who arrives at Hogwarts under the guise of a dance instructor. He teaches a dance that is actually a means of opening a portal to the dark side. The students who participate unknowingly start to have their minds filled with dark thoughts. Harry, with his natural resistance to the dark side, notices the change in his classmates and tries to stop the dance instructor before it's too late. He teams up with Hermione and Ron to figure out the true nature of this 'dark side dance' and close the portal.
Well, a plot twist could be that the dance instructor is actually a disguised Death Eater. They start using the dance class as a cover to pass on secret messages or to plant some sort of dark magic object. Maybe they try to manipulate the students' movements in the dance to form some sort of dark symbol. Another interesting plot twist could be that the magic used in the dance class goes haywire. Instead of normal dance moves, the students start floating uncontrollably or their feet move on their own in a chaotic way, leading to a lot of comical and dangerous situations.
One idea could be a story where Hogwarts holds a magical dance competition. The different houses form teams and they have to incorporate spells into their dance routines. Harry could be the lead dancer for Gryffindor, and they face challenges like the Slytherin team trying to jinx their performance.
Obviously, Harry Potter himself could be a main character. He could be the one who is initially reluctant to participate in a dance event but then discovers a new passion for it. Hermione could also be a main character as she might be the one researching the history and significance of different wizarding dances.
The plot could involve a situation where a new form of dark magic is unleashed in the wizarding world, which spreads like wildfire and causes destruction similar to 911. The Ministry of Magic is caught off - guard. Hermione, with her vast knowledge, starts researching a way to counter this magic. Meanwhile, Ron and Harry lead the effort to protect the civilians. They set up shelters in places like the Room of Requirement and use Patronuses to guide people to safety. As they dig deeper, they discover that this dark magic was a planned attack by a long - hidden dark wizard group who wants to take over the wizarding world.
Yes, there are some. You can try searching on fanfiction websites like FanFiction.net or Archive of Our Own. Just type in 'Harry Potter can dance' in the search bar and you might find some interesting stories where Harry shows off his dancing skills in the magical world of Hogwarts or during some wizarding events.
One possible plot could involve a group of spiders that have been enchanted by a dark wizard. These spiders start attacking Hogwarts students. Harry, along with his friends Hermione and Ron, would need to find the source of the enchantment and break it to save the school. They might have to explore the Forbidden Forest more deeply and face their fear of spiders to do so. This would combine the elements of adventure, mystery, and the existing spider lore from the Harry Potter series.
The plot could involve Catwoman being drawn into the wizarding world by some mysterious magical force. She might start out as an outsider, trying to figure out how things work. Maybe she gets involved in a plot to steal a powerful magical object, but along the way, she starts to have a change of heart and decides to help the good guys instead.
A plot could be that Gaster has a connection to the Forbidden Forest in Harry Potter. He might be the source of some of the strange and dangerous creatures there. As Harry and his friends explore the forest more, they start to notice Gaster's influence. Gaster could also be using the forest as a way to try and get back to his own world or to gain power in the Harry Potter universe. This would lead to a series of adventures and battles as the characters try to either stop Gaster or understand his motives.
In this fanfiction, the plot could center around Harry Potter arriving in Tamriel during a time of great unrest. He discovers that there are parallels between the magical hierarchies in Tamriel and Hogwarts. He could get involved in the political struggles of the various factions in Tamriel while also trying to find a way back home. Along the way, he might teach some of the Tamriel mages about some of the more advanced magic he learned at Hogwarts, like Patronus Charms, and in return, learn about Tamriel's unique magical artifacts and how to use them.