A common trope is the 'dangerous journey' where Harry and Hermione have to travel through Ringwraith - infested areas. This allows for a lot of action and adventure scenes. Also, the 'mystery solving' trope is popular. They might have to figure out the secrets behind the Ringwraiths' existence or a way to permanently defeat them.
The 'protector - protected' trope can be seen too. For example, Harry might be in a position where he has to protect Hermione from the Ringwraiths or vice versa. This can bring out different aspects of their characters, like Harry's heroism or Hermione's vulnerability. There's also the 'alternate universe' trope where the rules about Ringwraiths, Harry, and Hermione are completely different from the original story.
One popular trope is the 'unexpected alliance'. Harry and Hermione might form an unexpected alliance with a former Ringwraith or someone related to the Ringwraiths. This adds an interesting twist to the story. Another is the 'power - up' trope, where Harry and Hermione gain new powers specifically to combat the Ringwraiths.
The 'hidden friendship' trope is also common. They keep their friendship a secret from the rest of the school because of the potential backlash. Draco might be worried about his Slytherin friends' reactions, and Hermione about her Gryffindor pals. So, they meet in secret places like the Room of Requirement to hang out.
One popular trope is the redemption arc for Snape in relation to Harry's family. This often involves Snape making amends for his past actions towards James and finally fully accepting Harry as part of Lily's legacy. Another trope is the 'what - if' scenario, like what if Snape had been more involved in Harry's upbringing. There are also fanfictions that focus on Snape protecting Harry's family from hidden threats, using his skills as a double - agent.
Often, fanfic writers will put Harry and Hermione in situations where they are directly in the path of the Ringwraiths. This can lead to some really intense and exciting scenes. The Ringwraiths, with their dark and menacing presence, can be used to create a lot of suspense. Harry and Hermione's characters may be developed further as they deal with the fear and danger that the Ringwraiths bring.
One popular trope is the 'enemies to friends' or 'enemies to lovers' trope. It's about how they start off as adversaries but gradually develop a different relationship. Another is the 'roommate' trope where they end up sharing living quarters and have to deal with each other on a daily basis.
The 'time - travel' trope is also common. As I mentioned before, it can be really interesting to see them go back in time and interact with the younger versions of themselves or other characters. It often leads to a lot of plot twists and revelations.
One common trope is the 'time - travel' one. As in, Hermione travels back in time and gets involved with Fabian and Gideon. It allows for a lot of interesting interactions and plot developments. Another is the 'hidden connection' trope, like Hermione having some sort of ancestral or magical link to the Prewett family.
One popular trope is the 'slow burn'. In these stories, Harry slowly realizes his feelings for Hermione over time, often through shared experiences and challenges. Another is the 'alternate universe' trope, where the story is set in a different version of the wizarding world and their relationship can develop in new and unexpected ways. And there's also the 'love triangle' trope, where Ron might be involved and Harry has to navigate his feelings while dealing with his friendship with Ron.
One popular trope is the 'enemies - to - reluctant - allies'. Given their history of animosity, it's interesting to see them pushed into a situation where they have to cooperate. Another is the 'redemption arc' for Snape, and Sirius being a part of that in some way, either by initially opposing it and then coming around, or being a catalyst for Snape's change.
The 'power - sharing' trope is also common. This could be where Hermione's magic and the powers of the vampires or other supernatural beings in The Vampire Diaries interact in unexpected ways. Maybe she uses her magic to enhance their powers or vice versa. It creates a lot of interesting plot possibilities.
One popular trope is the 'enemies - to - lovers' scenario. They start off hating each other because of their house differences and different beliefs, but as time goes on, they slowly fall in love. Another is the 'forced proximity' trope. For instance, they might be locked in a room together for some magical reason, and during that time, they get to know each other better and feelings start to develop.