One common theme is friendship. Since Esme and Leah are from different 'groups' in the Twilight world, their friendship is often explored. Another theme is acceptance. Leah has to accept Esme's way of life and vice versa.
One common theme is self - discovery. Leah is often portrayed as trying to figure out who she is as a werewolf and as a person. Another theme is love and relationships. Since the Twilight series is full of complex relationships, Leah's fanfiction also explores her love interests, whether it's a new character or someone from the existing cast. And there's also the theme of acceptance, as she tries to be accepted by her pack, the Cullens or the human world.
One common theme is the mother - daughter like relationship. Esme often takes on a maternal role towards Bella. Another theme is protection. Esme wants to protect Bella from the dangers of the vampire world.
One common theme is redemption. Leah often has a journey of self - rediscovery and finding her place, and Paul can be a part of that journey. Another theme is the struggle with their wolf nature. Since they are both werewolves in the Twilight world, they have to deal with the instincts and limitations that come with it in many fanfictions.
One common theme is love and loyalty. Despite the challenges they face, their loyalty to each other is often explored. Another theme is self - discovery. Leah, especially, is often on a journey of self - discovery in relation to Sam. And the theme of family also comes up as their relationships are intertwined with the larger werewolf family in the Twilight universe.
Power and identity are also prevalent themes. Leah's unique position as a female werewolf in the Twilight universe means her power and identity are often explored. Fanfictions may show her coming to terms with her power, or how her identity as a werewolf affects her relationships and her place in the world.
One common theme is friendship. The OC often forms a strong bond of friendship with Leah, which helps Leah deal with her own issues in the Twilight world. For example, in many stories, the OC is there to support Leah during her difficult times.
Another theme is friendship. When she crosses over, she has to form new relationships. In many fanfics, Leah forms strong bonds with characters from other universes. These friendships help her in her new adventures and also add depth to the story. A good example is when she teams up with a group of magical beings in one crossover and they rely on each other.
One common theme is their backstories. How they came to be vampires and how they found each other. Another theme is their relationship development, like how they deal with the challenges of being in a relationship in the vampire world.
The theme of redemption is also seen often. Leah has made some mistakes in the Twilight story, and fanfics might show her trying to make up for those mistakes and become a better person. There's also the theme of family. Some fanfics explore Leah's relationship with her family members, both in the werewolf pack and her biological family, in more depth.
One common theme could be friendship exploration. Since Angela and Leah are both characters from the Twilight universe, their relationship in fanfiction might start as a budding friendship and then develop into something deeper, like a strong bond that helps them through the challenges in the Twilight world.