One common theme is the exploration of their relationship in an alternative universe. Since they are from different 'sides' in the Twilight series, fanfics often create scenarios where they can interact more freely.
You can try fanfiction websites like Archive of Our Own (AO3). There are a large number of fanfics there. Just use the search function and type in 'Jacob x Rosalie' to see the available stories.
I really like 'A New Dawn for Jacob and Rosalie' in the world of jacob black and rosalie hale fanfiction. It starts with a very interesting premise where Jacob and Rosalie are forced to work together on a mission that could save their respective clans. As they spend more time together, their relationship evolves in a very engaging way. There's also 'Moonlit Meetings' which is full of intense emotions and great character development for both of them.
One common theme is friendship. Many fanfics focus on how Bella and Rosalie can become friends despite their initial differences. Another theme is self - discovery. They often help each other to understand themselves better.
Well, without having read the exact 'enoch x jacob' fanfic, it could potentially center around their character development in relation to each other. Maybe it explores how they meet and how their friendship or more than friendship bond evolves over time. It could also be set in a specific genre like fantasy or science - fiction, and the story would then be shaped by the rules and elements of that genre.
One interesting fanfiction could be about Jacob and Rosalie forming an unlikely alliance to protect the Cullen family from a new threat. They put aside their differences and use their unique abilities to fend off the danger.
Jacob's family might be initially shocked, especially if it was unexpected. But they would likely come around and be supportive. His parents might offer their wisdom on raising a child. Rosalie's family, depending on their nature in the fanfiction, could be either overjoyed or a bit more reserved. If they are more traditional, they might have concerns about the relationship between Jacob and Rosalie.
Perhaps a plot where Jacob and Rosalie are forced to go on a journey together. During this journey, they face various challenges that test their limits. They might have to rely on each other's unique abilities to survive. For instance, Rosalie's super strength and speed could help in some situations, while Jacob's ability to transform into a wolf gives them an edge in others. Along the way, they develop a friendship that was unthinkable at the start.
Their relationship could start off rocky. Jacob has always had a bit of a temper, and Rosalie is not one to back down easily. But as they interact more, they might find common ground. Maybe it begins with a grudging respect for each other's loyalty to their own kind. As time passes, they could start to see the good in each other beyond their species differences. For example, Jacob might admire Rosalie's fierce protectiveness of her family, and Rosalie could come to appreciate Jacob's straightforwardness.
One great oc x Rosalie fanfic is 'A New Bond'. It beautifully weaves the story of an original character into the world of Rosalie. The character development is well - done, and the relationship that unfolds between the oc and Rosalie is both heartwarming and engaging.