A common theme is power dynamics. Since Jacob is in a dominant role, it often explores how power affects their relationship. Another theme is protection. Jacob's dominance can be linked to his need to protect Bella.
One popular 'jacob dominates bella fanfiction' could be 'Jacob's Ascendancy'. In it, Jacob's character is shown in a very strong and dominant role over Bella. It explores their relationship in a different light, with Jacob making decisions that shape their interactions in new ways.
Typically, in 'bella dominates edward fanfiction', Bella is more assertive. She is no longer the damsel in distress but rather the one in control. For example, she might be the one making decisions about where they live or how they deal with other vampires.
Sure. There might be some new characters created specifically for this fanfiction. Maybe a wise elder in the werewolf community who gives advice to Jacob about how to handle the situation with Bella and the pregnancy. Or perhaps a human friend of Bella's who discovers the truth and has to deal with the shock of the supernatural world.
Bella herself might struggle with her identity. She has been so caught up in the vampire world before, and now being with Jacob, a werewolf, she has to redefine who she is and where she belongs. She may also worry about how her human family and friends will react to her being with a werewolf.
A dominant Jacob is usually in touch with his alpha side. This means he has a natural leadership quality. He can command respect from others in the fanfiction world. And when it comes to Bella, this leadership translates into him guiding their relationship in a way that he believes is best for both of them. He may be more confident and self - assured, which can be both appealing and a source of conflict in the relationship with Bella.
The popularity also stems from the fact that it allows fans to delve deeper into the personalities of Edward and Bella. His dominance can bring out different aspects of Bella's character, like her resilience and her ability to stand up to him, which makes for interesting storytelling.
It could mean that in the fanfiction, the character Alice has a dominant role over Bella. Maybe Alice is in a position of power, control, or influence in the story's plot and her relationship with Bella.
It could be because it offers a new perspective on their relationship. In the original story, Carlisle is more of a father figure, but in fanfiction, this dominant role can bring out different aspects of their personalities and create more exciting storylines.