Well, Fanfiction.net is a classic place to start. There are thousands of Twilight Jasper fanfictions there, sorted by different categories like romance, adventure, etc. AO3 is also really good. It allows for more detailed tagging, so you can specifically look for the type of Jasper - centric stories you like, whether it's about his backstory or his relationships.
One great Twilight Jasper fanfiction is 'Jasper's Redemption'. It delves deep into Jasper's past and how he copes with his vampire nature in the Twilight universe. Another is 'Jasper and Alice's Untold Tales' which focuses on their relationship from a different perspective, showing their hidden moments and emotions.
Another theme is the struggle with their vampire nature. They are vampires in the Twilight world, and fanfictions sometimes explore how they deal with things like bloodlust and fitting into the vampire society while maintaining their relationship. It's interesting to see how different authors handle this aspect.
Love and loyalty are common themes. Their relationship is often explored in depth, showing how their love for each other endures through different challenges. For example, in many fanfictions, they face threats from other vampires or difficult situations within the Cullen family, but their loyalty to each other never wavers.
Possibly, it's a tale where Jasper's entry into the mafia leads him to uncover hidden truths about the vampire world and forces him to make difficult choices that affect his relationships with other characters.
Love and commitment are very common themes. Since it's about their wedding, the focus is often on their deep love for each other and their commitment to a future together.
It's hard to say who the 'best' is as it depends on personal taste. However, some popular authors in the fanfiction community might include those who have been writing for a long time and have a large following. For example, some authors on platforms like FanFiction.net or Archive of Our Own have a reputation for creating engaging Alice and Jasper stories.
Well, 'Jasper's New Beginning' is quite well - liked. It shows Jasper starting a new chapter in his life, away from the usual vampire drama. Then there's 'The Jasper Chronicles' which chronicles his adventures and experiences in a very detailed way. And 'Jasper's True Nature' explores his character more deeply, highlighting his unique abilities and how they affect his relationships.
One possible reason could be a difference in their views on how to protect the Cullen family. Alice might be more focused on using her visions to predict threats and take preemptive actions, while Jasper, with his military background, could prefer a more direct and combative approach. This divergence in strategies might lead to a fight between them.