One popular trope is the power - up trope. For example, Harry might gain new and powerful magic abilities through his interactions with the members of the harem. Another is the friendship - evolution - into - more trope. His friendships with the characters in the harem gradually develop into deeper, more complex relationships. For instance, in some fanfics, Hermione might start as just a friend but then develop romantic feelings over time.
The training - and - growth trope is also quite common. Harry could be trained by the members of the harem in different forms of magic or combat, and as a result, he grows both as a wizard and as a person. Also, the adventure - together trope is popular. Harry and the harem members go on various adventures in the wizarding world, like exploring hidden dungeons or facing ancient magical creatures. In these stories, they rely on each other's skills and abilities to overcome challenges.
One popular trope is the 'fish out of water' situation where the main character, often a self - insert or an OC, finds themselves in the middle of a harem of Harry Potter characters. Another is the 'enemies to lovers' within the harem, where some of the characters initially dislike the main character but then fall for them. Also, the 'power - up' trope is common, where the main character gains new magical abilities or knowledge through their interactions with the harem members.
One popular trope is the 'fish out of water' story. For instance, a superhero is suddenly dropped into the wizarding world and has to figure out how to use magic or just deal with the strange customs. Another is the power - sharing trope. Maybe a wizard shares their magic with a superhero, or vice versa, creating a new and powerful combination.
The struggle between light and darkness is a big theme in 'Kingdom Hearts' fanfics. Writers might create stories that show how characters are tempted by the darkness or how they fight to preserve the light. Additionally, the relationships between the main characters and the new characters introduced in the game can be a theme. For example, how Sora befriends characters from new worlds he visits. And the concept of saving the worlds from the threat of the Heartless and other villains is also a popular theme.
Some popular tropes include the 'Magical Creature Bond' trope. Here, the reader forms a special bond with a magical creature like a hippogriff or a phoenix. It gives them an edge in the wizarding world. The 'Lost Heir' trope is also seen often. The reader might be the long - lost heir to a powerful wizarding family, like the Blacks or the Potters. And don't forget the 'Dark Arts Temptation' trope, where the reader is lured by the power of the Dark Arts and has to struggle between good and evil.
The 'Secret Sibling' trope also shows up. Imagine a story where it's revealed that one of the Weasley kids has a demigod sibling they never knew about. Or that one of Percy's half - siblings is actually a wizard in disguise. There's also the 'Time - Travel' trope. A character could go back in time and change events in both universes. For instance, a demigod could go back and prevent Voldemort's rise to power, or a wizard could go back and stop the Titans from awakening. These tropes add new and exciting twists to the existing stories of both series in fanfic.
Well, a typical trope is the exploration of how the wizarding society views multiple pregnancies. It could be different from the Muggle perspective. Also, there's often the idea of the unborn children having special powers or destinies. This leads to a lot of speculation and protection efforts from the characters in the fanfiction. Additionally, the relationship between the parents might be tested or strengthened during the pregnancy period, which is also quite common.
One popular theme is the exploration of different Hogwarts houses. Writers often create stories that focus on the unique qualities and interactions of students from Gryffindor, Slytherin, Hufflepuff, and Ravenclaw.
The 'rivalry - turned - love' trope is also common. Some female characters start off as rivals to Naruto in terms of power or goals, but then gradually develop romantic feelings for him. Like Sakura might initially be more focused on Sasuke, but in the fanfic, she realizes Naruto's true worth and falls for him.
One common trope is the 'fish out of water' where the main boy enters a new world full of different male characters vying for his attention. Another could be the 'slow burn' relationship development among the characters in the harem.
Rather than focusing on this type of fanfic which might not be in line with the values of the original work, you could look into fanfics that expand on the relationships between the main characters in a more positive and respectful way, such as exploring the deep friendship between Harry, Hermione and Ron, or the backstories of other minor characters within the 'Harry Potter' universe.