One popular trope is the 'What if' scenarios. For example, what if Bella had chosen Jacob instead of Edward? Another is the 'alternate universe' concept, where the characters are in different settings like a modern-day high - tech world or a historical period. And the 'character backstory expansion' is also common, like delving deeper into Rosalie's past before she became a vampire.
A common trope is the 'power - up' for characters. In some fanfictions, Bella might gain special powers beyond just being a shield. Also, 'enemies - to - lovers' between side characters can be found. For instance, two vampires from rival clans falling in love. Then there's the 'time - travel' trope, where a character goes back in time and tries to change events in the Twilight universe.
One popular trope is the 'new girl in Forks' where the reader - insert character is a new arrival in town and catches the attention of the Twilight characters. Another is the 'human - turned - vampire' scenario where the reader - insert experiences the transformation. And of course, the 'love triangle' trope is quite common, often involving the reader - insert, Edward, and Jacob.
One popular trope is the mermaid's struggle to fit into the Twilight world. Since the Twilight series has its own set of rules about vampires and werewolves, a mermaid character often has to find her place among them. Another is the love triangle, which is a staple in Twilight. A mermaid might find herself in love with a vampire or a werewolf, creating a complex romantic situation. And the idea of the mermaid having some sort of special power that is unique to her mermaid nature but also relevant in the Twilight universe, like being able to communicate with sea creatures and using that to help the Twilight characters in some way.
In many of these fanfictions, the 'discovery' trope is often used. It's about how they first find out about the pregnancy. It could be a shock, or there could be some signs that they initially misinterpret. And then there's the 'adaptation' trope. They have to adapt to the physical and emotional changes that come with the pregnancy, which is not easy given their vampire and werewolf natures.
In King Sombra and Twilight fanfiction, a common trope is the 'Forbidden Friendship'. Given King Sombra's dark nature, a friendship with Twilight would be seen as something not supposed to happen. It creates an interesting dynamic as they both come from very different worlds. Also, the 'Teaching' trope is often used. Twilight, with her vast knowledge, might try to teach King Sombra about the values of friendship and kindness. And finally, the 'Danger' trope, where King Sombra's presence always poses a threat to Twilight and her friends, leading to many tense situations in the fanfiction.
One popular trope is the 'forbidden love' aspect. Since Twilight has different species like vampires and werewolves, a relationship between a human reader and one of these non - human characters can be seen as forbidden. Another is the 'fated mates' trope, where the characters are destined to be together. It adds an element of inevitability to the relationship.
One popular trope is the 'fish - out - of - water' story. For example, a character from 'Fire and Ice' suddenly finds themselves in Hogwarts in the 'Harry Potter' world and has to figure out how to navigate the school. In Twilight - related fanfictions, a vampire might be the 'fish - out - of - water' in the 'Fire and Ice' world. Another trope is the love triangle, which is common in all three series. So in fanfiction, you might see a love triangle between a character from each of these universes.
In Twilight Emmett x OC fanfiction, the 'power imbalance' trope can be seen. Emmett has all the powers and immortality of a vampire, while the OC is a frail human. This creates an interesting dynamic. There's also the 'cultural clash' trope. The vampire culture in Twilight is very different from human culture. The OC has to adapt to things like vampire traditions, hunting habits, and their view on human life. And don't forget the 'redemption' trope. Maybe Emmett has some past actions he needs to make up for through his relationship with the OC.
The 'romantic crossover' trope is also quite popular. Picture Edward falling for a Fairy Tail mage or vice versa. It adds an interesting dynamic to the story, mixing the brooding love of Twilight with the more flamboyant relationships in Fairy Tail. There's also the 'team - up' trope, where characters from both series join forces to face a common enemy, which often leads to some exciting battles and plot developments.
One popular trope is the 'fish out of water' situation. For example, characters from Inuyasha's feudal Japan world find themselves in the modern - day setting of Twilight. Another is the power struggle trope. Inuyasha's demon powers and the vampires' powers in Twilight often lead to interesting power dynamics in the fanfics. There's also the love triangle trope, with the main characters from both universes getting involved in complex relationships.
One popular trope is the 'rivalry turned friendship'. In many fanfictions, Edward and Jacob start off as bitter rivals for Bella's affection. But as the story progresses, they realize they have more in common than they thought. Another trope is the 'alternate universe' where their roles are reversed. For example, Edward could be a werewolf and Jacob a vampire. It's a fun way to play with the established characters.