One common theme is the exploration of a new relationship. Since Bella and Eric are not mates in the original, it's all about how they come to be mates in the fanfiction.
Another theme could be the conflict that arises from this new relationship. There might be opposition from other characters who have different ideas about Bella and Eric being together. For example, those who were close to Bella or Eric in the original story might not be happy with this new pairing.
Often, there is also a theme of self - discovery. Bella, in particular, might discover new aspects of herself through her relationship with Eric. She may find that she has different strengths and weaknesses when she is with him compared to when she was with other characters in the original story. Also, the fanfictions might explore how their relationship affects the overall world or community they are in, whether it's a vampire or werewolf community or something else.
One theme that might show up is protection. Eric could be very protective of Bella, or vice versa. It could also involve themes of acceptance, especially if their relationship is different from what others expect. For example, if they come from a different background or have unique abilities. There could also be themes related to growing up together and the shared experiences that shape their characters.
In 'bella is emmett's mate fanfiction', a frequent theme is the transformation of relationships. The friendship between Bella and the other Cullens would shift. For instance, her relationship with Rosalie would be very different as Emmett is Rosalie's mate in the original. There could also be a theme of new beginnings. It's like starting a whole new 'Twilight' - like story but with a different romantic core, which gives the writer a lot of room to explore different plot directions.
One common theme could be friendship. Since Bella is Kate's mate, their relationship might be explored in terms of how they become friends and support each other. Another theme could be adventure. They might go on some sort of journey together in the story.
Love against all odds is a big theme. Their bond as mates in the fanfiction usually has to overcome various obstacles. It could be differences in their personalities, or external forces like rivalries or family expectations. Also, the theme of transformation is common. As they get closer, they might change each other in positive ways, like becoming more confident or more understanding.
One common theme is the discovery of love. Bella and Godric often have to figure out their feelings for each other. Another theme is the struggle against society's expectations. Their relationship might not be accepted by all in their world. And power is also a theme, as Godric usually has a certain amount of power, and Bella's role as his mate might change her relationship with power as well.
One common theme could be love and loyalty. Since they are mates, the story might revolve around their deep love for each other and their loyalty in the face of difficulties.
One common theme is the struggle against their different natures. Jasper has his violent past as a vampire, while Bella is a human. Fanfictions often explore how they deal with this difference.
Power is a common theme. Since Voldemort is a very powerful dark wizard and Bella is his devoted follower, their relationship in fanfiction often revolves around power sharing or Bella gaining power through her connection to Voldemort.
In 'bella and paul mate fanfiction', the theme of transformation is often present. Not just Bella's potential transformation into a werewolf's mate, but also the transformation of their relationship from hostility or indifference to love. There is also the theme of protection. Paul is a werewolf and has a natural instinct to protect, and this plays a big role in how he relates to Bella. And of course, the theme of love against all odds, as their relationship is not an easy one considering the complex world of Twilight that they are a part of.
The theme of self - discovery is also prevalent. As Bella gets involved with her mate, she often discovers new things about herself, her desires, and her place in the world.