Love and loyalty are also common themes. Despite the dominant - submissive aspect, the love between them is usually a central focus. They often have to prove their loyalty to each other in the face of other vampires or various threats. In some fanfictions, this is tested by external forces trying to break them apart.
Another element is the exploration of their characters. Bella's reaction to Jasper's dominance can show different aspects of her personality. She could be submissive at times, or she might challenge him, which makes for a complex relationship. In some fanfictions, this relationship also affects how they interact with other characters in their world.
Another theme is the power dynamic. Jasper has his special abilities and Bella has her own charm. Fanfictions may play with how these two aspects interact and influence each other. For example, in some stories, Bella's humanity affects Jasper's view on his vampiric nature.
A prevalent theme in jasper and bella fanfiction is the struggle against the odds. They come from different backgrounds and have different natures within the Twilight universe. Fanfictions often focus on how they overcome these differences. Also, themes of loyalty and sacrifice are common. They might be in situations where they have to be loyal to each other and make sacrifices for their relationship or for the greater good of their vampire - human world.
One common theme is protection. Sam being dominant often means he's protecting Bella from the supernatural threats in their world, like vampires or other werewolves. Another theme is the power dynamic in their relationship, how they navigate Sam's dominant role and Bella's more human and sometimes vulnerable position.
One common theme is the exploration of their forbidden love. Since Jasper is a vampire and Bella is a human in the Twilight universe, there's often a sense of danger and secrecy in their relationship in the fanfiction. Another theme could be the struggle against their own natures. Jasper has his vampire instincts and Bella her human vulnerabilities.
One common theme is the struggle between Jasper's vampire nature and his growing love for Bella. His instincts as a vampire often conflict with his feelings, creating an interesting internal battle.
One common theme is friendship. Despite the complex nature of their relationships in the original Twilight series, fanfictions often explore how they can form strong friendships. Another theme is protection. Given that Bella is often in need of protection, Carlisle and Jasper are usually depicted as being key in keeping her safe.
Romance is a very common theme. Writers often explore the relationships between these characters in a romantic context. Another common theme is adventure, where they might go on quests or face challenges together.
One common theme is friendship. They often have to learn to trust and rely on each other.
Another theme is the impact on the Cullen family dynamic. Their relationship, if they are related, can change the power balance and the way the family functions. It can also cause tensions or bring new understandings among the family members.