A theme that sometimes pops up is teamwork. Since they are part of a team in the original series, fanfics may focus on how they work together in different scenarios, highlighting their individual strengths and how they complement each other. Also, the theme of acceptance can be seen. For example, Beast Boy might have to accept Miss Martian's different cultural background or powers, and vice versa, which can create interesting storylines in fanfics.
A key element would be the discovery of their relationship. It could be a shock to both of them and the reactions would be interesting to explore. Another element is how they interact with their shared friends and teammates. Do they keep it a secret or are they open about it? Also, their different powers could play a role. Maybe they combine their powers in unique ways to solve problems because of their new - found bond.
In some fanfics, their sibling relationship could be explored through flashbacks. For example, showing how they were separated as children due to some intergalactic event. Then, in the present, they are reunited and have to catch up on all the years they missed. This could involve them learning about each other's cultures and dealing with the differences between being a Martian and a shape - shifter.
You can start by looking on fanfiction platforms like Archive of Our Own (AO3). It has a large collection of fanfics for various fandoms, including Beast Boy and Miss Martian. Another option is FanFiction.net. Just search for the relevant tags and you'll likely find some interesting stories.
Friendship and teamwork are also common themes. Since they are from different universes, they have to work together. They learn to trust each other and overcome their differences. In many fanfics, they form a strong bond that helps them face various challenges, whether it's a powerful villain or a difficult situation in a strange new world.
One common theme is the exploration of her relationships. For example, how her pregnancy might affect her relationship with her teammates or love interests. It could show a more vulnerable side of her character.
Another theme is friendship. They both have their own groups of friends in their respective universes. In the fanfictions, they usually end up becoming friends and learning from each other. For example, Miss Martian might teach Harry about her telepathic abilities and Harry could introduce her to the magic of Hogwarts. It's about the bond that forms between two very different characters.
One common theme is self - discovery. Beast Boy often has to figure out his own feelings and how he really feels about each person in the harem. Another theme is friendship within the harem. Even though there are romantic elements, the characters also form strong bonds of friendship. For example, they might support each other during battles or tough times.
Adventure is also a common theme. Writers often put them in exciting situations like fighting against a new villain or exploring a mysterious place. This not only adds action to the story but also gives them opportunities to bond and develop their relationship further. For instance, they might be on a quest to find a lost artifact that has some connection to their powers or their families.
One common theme is transformation. Since Beast Boy can already transform into animals, adding a dragon element often explores different and more powerful forms of transformation. Another theme is self - discovery. Discovering a connection to dragons can lead to Beast Boy learning more about his powers and his place in the world.
One common theme is the exploration of their powers working together. Since Kid Flash has super - speed and Miss Martian has a variety of mental and shape - shifting powers, fanfictions often play with how they can combine their abilities to solve problems or fight villains.