One common trope is 'enemies to lovers'. Since Scar and Grian often have a bit of a rivalry in their original content, it makes for an exciting dynamic in fanfiction. Another is the 'hurt/comfort' trope where one of them gets hurt and the other takes care of them. It can really show the depth of their relationship.
There's also the 'time - travel' trope in scarian fanfiction. For example, one of them might go back in time and change things that affect their relationship. It allows for a lot of creativity in exploring different scenarios and how their relationship could have developed differently.
One popular trope is the 'enemies to lovers' trope. It creates a lot of tension and interesting character dynamics. Another is the 'found family' trope, where a group of characters who are not related by blood become like a family. 'Time travel' is also a common trope, allowing for all kinds of plot twists.
Archive of Our Own (AO3) is a great place to start. It has a large collection of fanfiction in general and a dedicated section for scarian fanfiction. The tagging system on AO3 makes it easy to find exactly what you're looking for, whether it's a specific genre or trope.
Sure, there are several. The 'omegaverse' trope has made its way into dekubowl fanfiction at times, although it's a bit more niche. In a more common vein, the 'fish - out - of - water' trope can be found. This is when Deku is put in a situation that he's not used to, like in a different social setting or a new type of hero mission, and his relationship with another character blossoms from there. Additionally, the 'found family' trope is popular. Here, Deku forms a very close bond with another character or a group of characters that is like a family, which can have elements of both platonic and romantic undertones depending on how the author writes it.
One popular trope is the 'unlikely alliance'. Given their differences, it's interesting to see Lysandre and Ash team up. Maybe they have a common enemy that forces them to work together. Another trope could be 'redemption'. If Lysandre is portrayed as a villain initially, he might find redemption through his relationship with Ash. For example, Ash's positive influence could make Lysandre question his actions.
One popular trope is the 'Outcast to Hero' arc. The reborn mutant starts as someone shunned for their new abilities but then rises to become a hero. Another is the 'Discovering Hidden Powers' trope, where the character gradually uncovers more and more powerful abilities as the story unfolds.
One popular trope is Hermione as the brilliant problem - solver. In many fanfictions, she uses her vast knowledge of magic and her quick thinking to get out of difficult situations. For instance, when there's a dangerous spell or a mystery to solve, Hermione is often the one who figures it out first.
A common trope is the 'what - if' scenario. For example, what if a certain character had made a different decision at a crucial moment? This can lead to completely different storylines. Another popular trope is the power - up trope, where a character gains new abilities or enhances their existing ones in unexpected ways.
A popular trope is the vampire with a heart of gold. Despite being a creature of the night, they have a soft side, especially when it comes to a particular human. It's a way to add depth to the otherwise menacing vampire character.
Sure. The 'fish out of water' trope can be seen in some Rosekiller fanfiction. For instance, if Rose is from a different place or dimension and has to adapt to Killer's world. Also, the 'redemption' trope can be applied, where Killer has a dark past and Rose helps him to become a better person.
One popular trope is the 'hidden power' trope. The OC might start off as an unassuming character but gradually reveals a powerful and unique ability that changes the course of the Holy Grail War. Another is the 'love interest' trope, where the OC becomes romantically involved with one of the canon characters, adding a new layer of drama to the story.