Obviously, Jeremy and Anna are the main characters as it's in their name. Jeremy is a human with connections to the supernatural world, and Anna was a vampire. Their ghosts in the fanfiction play important roles.
One interesting story could be where Jeremy and Anna go on a journey to find a way to bring back some of their lost friends. In this fanfiction, they might face many challenges and their relationship could grow stronger as they rely on each other.
One interesting story could be where Jeremy and Anna's ghosts team up to protect Elena from a new supernatural threat in Mystic Falls. They use their ghostly powers to communicate with the living and help gather information.
There is a story where Jeremy and Anna work together to save the town of Mystic Falls. In the process, they realize how much they mean to each other. At the end, they start a family and raise their children in a safe and loving environment. The fanfiction focuses on their growth as individuals and as a couple, and the happy ending is really satisfying as it ties up all the loose ends in their story.
One great 'Vampire Diaries Jeremy Fanfiction' is 'Jeremy's New Path'. It explores Jeremy's journey after he discovers new powers. It's really engaging as it shows his struggle to control these powers and how it affects his relationships with the other characters in the show.
One great Damon and Jeremy fanfiction is 'The Bond Beyond Blood'. It delves into how Jeremy, after his experiences in Mystic Falls, starts to see Damon in a new light. Their relationship evolves from one of distrust to a sort of begrudging respect and then to an unexpected friendship. The story is full of action and the typical Vampire Diaries drama.
Archive of Our Own (AO3) is also a good option. It has a more diverse range of fanfiction, including some really unique takes on Jeremy's character. The tagging system on AO3 makes it easy to find exactly what you're looking for in terms of plot, genre, and relationship dynamics.
Another interesting pairing could be Jeremy and Caroline. Caroline is already a vampire, so she could mentor Jeremy in a way. They could have a fun, flirty relationship where they go on adventures together and learn more about the vampire world as a team. It would be interesting to see how their personalities clash and mesh at the same time.
One interesting story could be about Jeremy exploring his new vampire powers in a way that the show didn't fully explore. For example, he might use his vampire abilities to protect the town from a new threat that's not related to the typical vampires or werewolves. Maybe he teams up with some unexpected characters to fight this new danger.
They are an interesting pairing because they are so different. Klaus is an old and powerful vampire with a dark past, while Jeremy is a young human (for a while) with his own set of problems. The contrast between their power levels and personalities makes for great storytelling.