Well, a recurring theme is the power dynamics. In the Twilight Life and Death universe, there are different levels of power among the characters, and fanfictions often play with these power dynamics. For example, how a weaker character can overcome a more powerful one through wit or other means. Another common theme is the exploration of the unknown. The supernatural elements in the story open up a world of the unknown, and fanfictions like to delve deeper into that, whether it's exploring new types of vampires or other mysterious creatures.
One common theme could be sacrifice. Maybe Twilight sacrifices herself for the greater good of Equestria. For example, she might face an extremely powerful enemy and give up her life to save her friends and the land.
One common theme is the power of love to transcend the boundaries of life and death. In Twilight, the vampires are already sort of 'between' life and death, and when you add the concept of love beyond death, it becomes even more complex. Another theme could be sacrifice. A character might sacrifice their own 'undeath' or some other important aspect to be with their loved one who has passed on.
A major theme in 'death and life and death stories' is the mystery surrounding death. We don't fully understand death, and these stories often explore that. Also, the cycle of life and death is a big theme. We see how life feeds into death and death into new life, like in the cycle of seasons. In nature, plants die in winter but come back to life in spring, and this natural cycle is often mirrored in these stories.
One common theme is the exploration of power. Harry, being the Master of Death, has a certain level of power, and when combined with the Twilight universe, it often leads to stories about how he uses or struggles with that power. For example, how he might interact with the vampires and werewolves in the Twilight world with his unique abilities.
The theme of transformation is quite common in death life and death stories. When someone is close to death, it can change them at a very fundamental level. Their values, beliefs, and relationships may all be transformed. Also, the theme of acceptance of death as a part of life is often present. People come to terms with the fact that death is inevitable, and this realization can be a powerful part of the story.
Love and romance are often at the core. Many Twilight fanfics focus on developing the relationships between the characters in different ways.
One common theme is the exploration of love. Just like in Twilight, love often plays a central role in Seventeen Twilight fanfiction. The relationships between the Seventeen members and the Twilight characters are often developed with a focus on deep emotional connections.
One common theme is forbidden love. Just like in the original Twilight series, but with the added element of a teacher - student relationship, which creates a more complex and often controversial dynamic.
One common theme is the struggle between good and evil. The assassin may be initially seen as a dark figure but might have a moral code that challenges the traditional view. Another theme is identity. The assassin might be trying to figure out who they are within the context of the Twilight universe.
One common theme is power. Alec has a lot of power in the Twilight universe, and fanfictions often explore how he uses or struggles with it. For example, some stories might show him trying to control his powers better.