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.
Well, time - travel is quite a common trope. Fans often write about characters going back in time to change certain events in the Harry Potter universe. Then there's the 'found family' trope. Since many characters in the original series lack proper family support, fanfiction often creates new family - like bonds between characters. Also, the 'secret power' trope where a character discovers a hidden ability that was not in the original books.
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 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.
The 'Power Transfer' trope is often seen. This is when a character from one series gains the power or ability from the other series. Say, Harry getting the ability to see ghosts like Sam does in Supernatural. And then there's the 'Shared Enemy' trope. A threat that is dangerous to both the wizarding world and the Supernatural world forces the characters to cooperate, creating exciting storylines.
In 20 years of Harry Potter fanfiction, there are several popular tropes. The 'Powerful!Harry' trope is quite common. Fans like to write about Harry having even more power than in the books. Also, the 'Soulmate' trope is popular, especially when it comes to romantic pairings. And the 'Dark!Hermione' trope has emerged, where Hermione takes a more morally ambiguous or even dark path, which is an interesting twist on her character.
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.
A very popular trope is the discovery of hidden powers. In Dragonball Super fanfiction, it might be a human character suddenly realizing they have Saiyan blood. In Harry Potter fanfiction, it could be a student finding out they have a special kind of magic no one knew about. The training montage trope is also seen often. If Harry Potter were to train with Goku, there would be a sequence of him getting stronger. In the Dragonball Super world, a wizard could have a training montage to master ki - based attacks. And of course, the 'enemies - to - friends' trope is popular. A Death Eater could become friends with a villain from Dragonball Super and then turn good.
The 'power - struggle' trope is also common. If Harry is a vampire, for instance, he has to deal with the power that comes with it and how it affects his standing in the wizarding world. There's also the 'mystery' trope, like when a series of strange events are linked to a vampire or werewolf character and Harry has to solve the mystery. This keeps the readers guessing.
One popular trope is the 'character swap'. For example, having Harry Potter end up in the 'Vampire Diaries' world and having to deal with the vampire politics there. It's interesting to see how his Gryffindor courage plays out in a different setting. Another is the'magic - mix' trope where the magic from both universes combines in unexpected ways. Like using a spell to control a vampire or a vampire's blood having some sort of magical effect on a wizard.
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.