One common theme is love. Just like in the original Twilight series, fanfics often explore different types of love between the characters. It could be the intense, all - consuming love like Bella and Edward had.
Another theme is the struggle between good and evil. Vampires in Twilight are often seen as both good and bad, and fanfics expand on this concept. They might show a vampire trying to resist their darker urges. For example, a vampire character might struggle with not harming humans while still being attracted to their blood. This creates a lot of internal conflict and makes for an interesting read.
Romance is a very common theme. Werewolves often fall in love with humans or other supernatural beings. Another theme is loyalty, as werewolves are usually very loyal to their pack. Also, the struggle between their animal instincts and their human side is often explored.
Well, a very common theme is mortality. Since Twilight has vampires and werewolves who are immortal or have long lifespans, fanfics often contrast this with the short and fragile lives of humans. It makes humans more aware of their limited time. Family is also a theme. How human families function in a town where there are vampires and werewolves lurking around. And then there's the theme of fear. Humans are naturally afraid of the unknown and the supernatural, and fanfics often play on this fear, showing how humans either overcome it or are consumed by it.
One common theme is friendship. Many fanfics focus on how Twilight and Cadence become friends and support each other.
One common theme is friendship. Angela often forms new friendships with the Twilight characters. For example, she might become friends with Bella or Edward, and these friendships can change the dynamics of the story.
One common theme is redemption. Since James is often seen as a villain in the original Twilight, many fanfics explore the idea of him finding a way to atone for his actions. Another theme is exploring his past. Writers like to dig deeper into what made James the way he was before he became a vampire.
One common theme is chaos. Since there's a 'crash' involved, it often disrupts the normal order of the Twilight world. For example, relationships might be put to the test as characters have to deal with the aftermath.
One common theme is friendship. Seth often forms deep friendships in these fanfics, like with other werewolves or even some of the vampire characters. Another theme is self - discovery. Since Seth is a young character in the Twilight series, many fanfics focus on him finding out more about his powers and his place in the world.
One common theme is adventure. Since it involves a 'ride', often the character, like Twilight, goes on an exciting journey, facing different obstacles and exploring new places.
Love and protection might also be common themes. In the Twilight world, the idea of a 'daddy' character could involve him loving and protecting the other characters, perhaps in a different way than in the original story. It could be about protecting a loved one from the dangers of the vampire or werewolf world.
One common theme is self - discovery. Jessica often finds herself in new situations in these fanfics and has to learn more about who she really is. For example, in many stories, she might enter a strange world and have to figure out her place in it.