One common theme is also self - discovery. Adam and Juliette are complex characters, and in fanfiction, they can often be on a journey of finding out more about themselves while being in a relationship. Also, the theme of family and how their relationship affects or is affected by their families or the people around them.
There's often the theme of sacrifice. They might have to sacrifice something for the sake of their relationship or for the greater good in the fanfiction world. Additionally, the theme of friendship can play a part, as they interact with other characters and how those friendships impact their relationship.
One common theme is power dynamics. Given their individual powers and the world they live in, fanfiction often plays with how their powers interact and how that affects their relationship. For example, in some fanfics, Cal's power might be a source of conflict or protection for Juliette. Also, redemption is a theme. Cal, in particular, might be on a path of redemption in relation to Juliette, trying to make up for past mistakes.
One common theme is friendship. They might explore how Juliette and Calliope become friends and support each other through various situations.
Another theme is adventure. Fans like to imagine Cal and Juliette going on exciting adventures together. It could be exploring new lands or facing dangerous foes. For example, in some fanfics, they might be on a quest to save their world from a great evil. This theme adds a lot of action and excitement to the stories. It also allows the characters to grow and develop as they face various challenges during their adventures.
I've heard of a fanfiction where Adam and Juliette go on an adventure outside their usual setting. It really delved into their characters more deeply. You could also try searching on Fanfiction.net. Just type in 'Adam and Juliette' in the search bar and browse through the results. There are often hidden gems among the stories.
Power management is also a theme that pops up. Adam has powerful bionic abilities, and in fanfiction, there could be stories about him learning to control them better. Maybe he accidentally causes some destruction with his powers and has to figure out how to fix it. Or perhaps he discovers new ways to use his powers that he didn't know before, which then leads to all sorts of adventures and challenges in the fan - written stories.
The theme of self - discovery can be seen in some Adam and Echo fanfictions. They might be on a journey where they learn more about themselves, their capabilities, and their place in the world, all while being in each other's company.
One common theme is redemption. Since Adam was sort of left behind in the show, many fanfictions focus on him redeeming himself or finding his purpose. Another theme is family. Adam trying to fit into the Winchester family dynamic is often explored.
Love is a very common theme. Most of the fanfictions revolve around Adam and Emma falling in love or being in a deep, committed relationship. Another common theme is growth, both as individuals and as a couple. For example, they might grow through facing challenges together.
A common theme is isolation. Just like in the original story, Adam is often portrayed as an outcast in fanfiction, struggling to find connection. For example, in many stories he wanders alone, longing for acceptance.
One common theme is his music. Fanfictions might explore how he gets inspired to write a particular song or what goes on during a recording session.