One common theme is their shared experiences in Hawkins. They both have been through a lot in that town, and fanfictions often explore how those experiences bind them closer.
One common theme is adventure. Given their experiences in the show, fanfictions often take them on new adventures together, facing strange creatures or uncovering mysteries. Another theme is romance development. Writers like to explore how their relationship might grow deeper and more complex over time.
Another one is 'The Love That Grew'. It focuses on the early days of their relationship, how they first fell for each other. It's a very sweet and detailed account of their initial interactions and the spark that grew between them.
You can start by looking on popular fanfiction websites such as Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms, and there's a good chance you'll find some great Jonathan x Nancy fanfictions there. Another option could be Fanfiction.net, though the content quality may vary more.
One common theme is their shared love for truth - seeking. In many fanfics, they team up to uncover mysteries together, just like in the show. This not only strengthens their bond but also shows how they are alike in their inquisitive nature.
In the fanfic, their relationship could develop as they face the reactions of their friends and family. Some might be overjoyed, while others could be skeptical or even disapproving. How they handle these external pressures together can bring them closer or cause some friction, which all adds to the complexity and growth of their relationship.
Another plot could be that they discover some unexpected powers or abilities related to the pregnancy. For example, Nancy might start having premonitions about the baby's future or Jonathan could sense danger more acutely to protect his family. They then have to figure out how to use these new abilities while keeping them a secret from others.
One great Jonathan x Nancy fanfic is 'The Moments Between'. It beautifully captures their complex relationship, exploring their shared traumas and how they support each other. The author does a wonderful job of staying true to the characters' personalities.
Perhaps there's a best friend character. This person could be a mortal who is initially unaware of Nancy's demigod status. As the story progresses, they might get dragged into Nancy's world and have to deal with the consequences. There could also be a villainous demigod who is trying to stop Nancy from achieving her goals or is causing trouble in the demigod world in general.