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.
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.
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.
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.
In some fanfics, Miss Martian might teach Naruto about her alien culture and technology. This could be really fascinating as Naruto is always eager to learn new things. He could then use some of this knowledge to improve his own village. It's also interesting to see how the two characters from very different universes interact with each other's friends and allies.
I really like 'Terra's Redemption'. In this fanfic, Terra gets a second chance at life and tries to make things right with Beast Boy. It has a lot of heart - felt moments and shows how their relationship can evolve over time. There are also some really cool action scenes that tie into the story. Overall, it's a great read if you're into Terra x Beast Boy fanfics.
One great fanfic with this theme could be 'Raven's Hidden Heart'. In it, the author beautifully depicts Raven's journey as she discovers her feelings for Beast Boy. It starts with small, almost unnoticed moments between them during team missions. The story gradually builds up the tension and the development of their relationship is very natural, showing Raven's internal struggle with her emotions.
One great 'Starfire x Beast Boy fanfic' is 'A Different Kind of Bond'. It shows their relationship developing in a really unique way. The story has a lot of heartwarming moments as they learn more about each other.
There are some fanfictions that might depict Beast Boy as a vampire beast in a post - apocalyptic world. He could be using his shape - shifting abilities in unique ways, like turning into nocturnal animals more easily since he has vampire traits. This type of fanfiction often delves into the darker side of his character and how he survives in a harsher world.
One possible plot could be that they face challenges in protecting their unborn child from enemies who might want to use the baby's powers for evil. Since both are Martians, their child would likely have unique and powerful abilities that could attract unwanted attention.
A good fanfic in this regard is 'Terra in Beast Boy's World'. It shows how Terra adapts to Beast Boy's world and the things he holds dear. The story is really well - written and makes you feel for the characters. Another one is 'Beast Boy and Terra: Unbreakable'. This fanfic emphasizes the unbreakable connection between them, even through tough times. There's also 'Terra's Transformation in Beast Boy's Eyes' which focuses on how Beast Boy sees Terra's growth and transformation, which is a really interesting take on their relationship.