Well, 'roommate aus' are quite popular in couple fanfic. It gives the characters a lot of close - quarters interaction which can lead to romantic feelings. 'Time - travel' tropes are also interesting, like one character going back in time to be with their loved one. And of course, 'high school sweethearts' is a classic, with all the drama and innocence of first love.
Some great couple fanfic tropes include 'forbidden love'. This could be due to different social statuses or families being against the relationship. 'Second chance at love' is also beloved, where a couple who broke up gets another opportunity. 'Mutual pining' is really engaging too, with both characters secretly loving each other but not admitting it.
One popular trope is 'enemies to lovers'. In many fanfics, two characters who initially dislike each other gradually fall in love. Another is 'the chosen one' trope, where a character is singled out for a special mission or power. 'Soulmate' trope is also common, where characters are fated to be together in some way.
One popular trope is the 'alternate universe' where the Avengers' story unfolds in a completely different setting or with different character dynamics. Another is the 'character redemption' arc, like when a villain - like character tries to become good. And of course, there's the 'team - up against an overpowering foe' trope which is classic in Avengers fanfics.
One popular trope is 'enemies to lovers'. In Sterek fanfic, Derek and Stiles start off not getting along but gradually fall in love. Another is 'soulmates'. Fans like to write about them being fated to be together. 'Hurt/comfort' is also common, where one of them gets hurt and the other takes care of them.
Well, the 'celebrity crossover' is quite popular. It could be a story where actors from different movies or shows interact in a completely new scenario. For instance, characters from a superhero movie meeting characters from a horror movie in a fanfic. Also, the 'backstage drama' trope is often used. This involves creating stories about the behind - the - scenes chaos, relationships, and rivalries in Hollywood. And then there's the 'time - travel' trope where a character goes back in time to change something related to their Hollywood career or a movie's production.
One popular trope is 'Soulmate AU'. In these stories, Dean and Castiel are fated to be together as soulmates. Another is 'Hurt/Comfort', where one of them is injured or in distress and the other provides comfort. 'Alternate Universe' is also common, like a high school AU where they meet in a completely different setting than the show.
Some popular tropes include the 'power - up' trope. This is when a character gains new powers or abilities and has to learn to control them. Also, the 'unlikely alliance' trope is quite common. It involves characters who would never team up in the original story coming together for a common goal. And of course, the 'love triangle' trope, which adds a lot of drama as one character is caught between two potential love interests.
One popular trope is 'enemies to lovers'. In klance fanfic, Keith and Lance often start off as rivals, constantly bickering and competing. Another is 'hurt/comfort', where one of them gets injured or is in emotional distress and the other is there to support and heal them. And 'soulmate AUs' are also common, where they are fated to be together in some supernatural way.
One popular trope is the 'first kiss' scenario. It's often filled with anticipation and nervousness. Another is the 'kiss in the rain', which adds a very romantic and dramatic touch. And the 'unexpected kiss' can also be a common one, where the characters are caught off guard by the sudden display of affection.
One popular trope is the 'What if' scenarios. For example, what if a certain character didn't die. Another is the 'Alternate Universe' concept where the characters have different backstories or powers. And the 'Romance' trope is also common, like pairing characters who might not have been together in the original shows.
One common trope is the 'enemies to lovers' situation. In sanscest fanfic, two Sans - like characters who initially dislike each other gradually develop feelings. Another is the 'soulmate' trope, where the characters are fated to be together on a soul level. And there's also the 'lost memory' trope, where a character forgets their relationship with another and they have to rebuild it.