Well, a major theme is self - discovery. Bella's love for Jacob can be a journey of her finding out more about herself and what she truly wants in a relationship. Also, the theme of family plays a part. Jacob's family and the pack become important aspects of Bella's life in these stories, and how she fits into that family dynamic is often explored.
The theme of sacrifice is quite common. Jacob may have to sacrifice some of his werewolf duties or beliefs for Bella, and vice versa. Additionally, the theme of acceptance is there. Bella has to accept Jacob's werewolf nature, and Jacob has to accept Bella's past with Edward. These themes add depth and drama to the fanfiction stories.
Yes, there are many. You can start by looking on fanfiction.net. There are numerous stories where Bella falls in love with Jacob. Some focus on an alternate timeline where Bella realizes her feelings for Jacob earlier in the story. They often explore the complex relationship dynamics between them, including the challenges of Jacob being a werewolf.
One common theme is the exploration of forbidden love. Since Bella was initially in love with Edward in the original 'Twilight' story, her relationship with Jacob in this context can be seen as something that goes against the established norms. Another theme could be the discovery of a new side of their relationship, like a deeper emotional and physical connection.
One common theme is the struggle against the odds. Since Bella has a connection with Edward in the original story, fanfictions often explore how Bella and Jacob overcome this obstacle to be together. Another theme is the exploration of their cultural differences, with Jacob being a werewolf and Bella being a human. It adds an interesting dynamic to their love story.
One common theme is the exploration of forbidden love. Since Carlisle is an older vampire and Bella is a human (initially), their relationship goes against the norms of both the vampire and human worlds.
One common theme is the love triangle between Jacob, Bella, and Edward. Many fanfictions explore how Jacob's feelings for Bella develop and how she navigates her relationships with both of them.
One common theme is unrequited love. In many fanfictions, Jacob's love for Bella is often not fully reciprocated in the way he hopes, leading to a lot of angst. For example, in some stories, Bella is still torn between Jacob and Edward, which creates a lot of emotional turmoil for Jacob.
Redemption can be a theme as well. Edward may be involved in bad things as part of the mafia, but through his love for Bella, he might start to question his lifestyle and try to change. Or Bella might see the good in him that others don't and help him find a path away from the more violent and illegal aspects of the mafia world.
The theme of self - discovery for both Jacob and Bella is also prevalent. Fanfictions often show how their experiences in Eclipse help them learn more about themselves, their desires, and their place in the supernatural world. For example, Jacob may discover new aspects of his werewolf nature while dealing with his love for Bella, and Bella might understand more about her own heart and what she truly wants in life.
Love triangles are a very common theme. Since Bella is torn between Jacob and Edward in the original story, this often gets explored further in fanfiction.
One common theme is the struggle between love and loyalty. Jacob and Bella have a deep connection, but Bella also has ties to Edward. Fanfictions often explore how Jacob and Bella navigate this complex web of relationships.