The 'time - travel' trope is often seen in 'Hermione Brings Fred Back to Life' fanfictions. She might go back in time to prevent Fred's death in the first place. Another trope is the 'mentor figure'. There could be an old and wise wizard who guides Hermione on this journey of resurrecting Fred. And the 'redemption' trope can also be present, where Fred's return is seen as a chance for him to make up for something or for the wizarding world to be redeemed in some way.
In these fanfictions, a common trope is the discovery of a new type of magic. It could be a lost branch of magic that Hermione stumbles upon while researching in the library. Also, the 'magical artifact' trope is popular. Maybe she finds a powerful artifact that has the ability to reverse death. And of course, there's the 'unexpected alliance' trope, where Hermione teams up with an unlikely character to achieve this seemingly impossible task.
The 'Triple Trouble' fanfic is quite popular. It's set during their time at Hogwarts and focuses on how they get into all sorts of hilarious and sometimes dangerous situations. It's popular because it really captures the essence of the characters and the Hogwarts environment.
Regarding Hermione bringing Fred back to life in fanfiction, it really depends on the creativity of the writer. Some might write it as a result of a magical experiment gone wrong (but right in the end). Others could have her make a deal with some powerful magical being. It's a very interesting concept that allows for exploring different aspects of the characters and the magic system in ways that the original series didn't.
One common trope is the 'Forced Proximity'. This is where Hermione and Bellatrix are put in a situation where they have to be close to each other, like when Hermione is captured by Bellatrix. It creates a lot of tension and interesting dynamics between the two characters.
The 'meeting - their - younger - selves' trope is also quite common. It's interesting to see how the twins interact with their younger versions. They might try to give advice or just have some fun messing with their younger selves. And then there's the 'discovery - of - hidden - secrets' trope. When they travel through time, they might uncover secrets about their family or Hogwarts that were lost in time.
A very popular one is 'Forbidden Feelings'. It has a lot of readers because it takes the idea of these three characters in a relationship and runs with it in a really engaging way. The story is full of drama and passion.
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.
In many 'Training Hermione Granger' fanfics, the 'training montage' trope is quite popular. It's like in movies where you see a series of scenes showing Hermione getting better and better at her skills over time. Also, the 'forbidden knowledge' trope often appears. Hermione delves into magical knowledge that is considered dangerous or forbidden, and her training is centered around handling this knowledge without getting corrupted. Another trope is the 'team - up' trope, where Hermione teams up with other characters, perhaps some from other magical schools, during her training for a common goal.
A less common but still interesting trope could be the 'time - travel' trope in relation to them. For instance, if Hermione were to go back in time and meet a younger Fleur, or vice versa. This could lead to all sorts of interesting plot developments as they interact with the past or future versions of each other and the events in the wizarding world.
There are several tropes in these fanfictions. The 'culture clash' trope can be interesting, as Snape with his Slytherin ways has to deal with Harry's Gryffindor nature. The 'Snape as a father figure' trope is also quite prevalent. Here, Snape fills the void left by Harry's parents, providing guidance and support. And the 'mystery solver' trope, where together Snape and Harry solve some of the long - standing mysteries in the wizarding world.