A very common trope is the 'Dark!Harry' concept. In these stories, Harry turns to the dark side, either because of being mistreated or for some other reason. It's interesting to see how the story unfolds when the main hero becomes an anti - hero. Also, the 'Teacher - Student Romance' trope exists, though it's a bit controversial. But it does add an element of forbidden love to the stories.
One popular trope is the 'alternate universe' where the story takes place in a different setting or with different rules from the original series. For example, a wizarding world where Voldemort never existed. Another is the 'character redemption' trope, like Draco Malfoy getting a chance to be a good person from the start. And 'romantic pairings' that fans love to explore, such as Hermione with someone other than Ron.
One common trope is the 'fish out of water' situation where Castiel is suddenly in the Harry Potter world and has to figure out how things work. Another is the 'powerful ally' trope where he becomes a crucial help to Harry and his friends.
A common trope is the crossover of magic systems. The magic spells in Harry Potter and the powers of the Miraculous are combined in unique ways. For instance, using a spell to enhance the power of a Miraculous transformation. Also, the 'lost in a new world' trope is popular, with characters from either universe finding themselves in the other and having to figure things out. There are often team - up scenarios too, where characters from both series join forces against a common threat that somehow involves both worlds.
One popular trope is the 'fish - out - of - water' story. For example, when Captain Marvel first arrives in the Harry Potter world, she's confused by all the magic. It's fun to see her adapt. Another is the 'team - up' trope, like Harry and his friends joining forces with Captain Marvel to take on a big bad. They combine their skills and powers.
One popular trope is the 'fish out of water' situation. For example, Bruce Wayne finding himself in the magical world of Harry Potter and having to adapt to the new rules and magic. It creates a lot of comical and interesting situations.
Well, there's the 'culture clash' trope. Sofia comes from a more fairy - tale - like world with a courtly setting, and Harry Potter is set in a more traditional wizarding world. So when the two worlds meet, there are a lot of differences to explore. Also, the 'lost in translation' trope can be used when it comes to magic spells and the different languages of the two universes. And of course, the 'found family' trope, as both series have strong themes of friendship and family, can be combined in fanfiction.
One popular trope is the 'fish out of water' where Tony Stark is suddenly in the magical world of Harry Potter and has to adapt. Another is the 'team - up' trope, where they join forces to fight a common enemy, like a dark wizard using technology in a bad way.
One popular trope is the 'fish out of water' story. A character from Harry Potter suddenly in Skyrim or vice versa, trying to figure out the new world's magic. Another is the power - up trope, where a character combines the magic of both worlds to become extremely powerful. For example, a Skyrim mage learning the Patronus charm and using it to fend off powerful enemies.
One popular trope is the 'what - if' scenario. For example, what if Harry Potter ended up in Narnia? Or what if the Pevensie children went to Hogwarts? Another common one is the 'alternate universe' trope, where the entire story is set in a different world with different rules but still features the beloved characters. There's also the 'character - centric' trope, like a story that focuses solely on Hermione's adventures in Narnia or Edmund's time at Hogwarts.
Another popular trope is the power - up or skill exchange. Imagine a character from Harry Potter learning the combat skills of the characters in Final Fantasy 13. Or a Final Fantasy 13 character learning how to cast spells like a wizard. This trope often leads to some really cool and unexpected battle scenes in the fanfiction.