Well, Cyborg could also be a main character. He and Beast Boy are good friends, and Cyborg might have to adjust to his friend's new appearance and the changes that come with it. And then there's Robin. As the leader, he would need to deal with how Beast Boy's transformation affects the team dynamics. Maybe he has to figure out new strategies that take into account Beast Boy's new situation.
At first, their relationship could be based on mutual respect for each other's powers. They might start by working together on a mission. Beast Boy's fun - loving nature could gradually break through Power Girl's tough exterior. She might start to see him not just as a teammate but as someone special. And for Beast Boy, Power Girl's strength and confidence would be very appealing. Their relationship would then grow as they share personal stories and experiences, slowly realizing they have deeper feelings for each other.
Maybe in the fanfiction, Beast Boy accidentally drinks a potion that turns him into a girl. As a girl, he has to deal with things like different clothing styles and social expectations. His powers might also be affected in some way. For instance, the animals he turns into might react differently to him as a girl. His friendship with Robin could also change as Robin has to be more cautious around him/her now.
In this fanfiction, Beast Boy could turn into a girl because of an encounter with an alien artifact. As a girl, he discovers new aspects of his powers. Maybe he can now communicate with different animals in a more empathetic way. His relationships with the other Titans change too. Starfire might take her on shopping sprees, thinking she needs more 'girly' things.
One possible plotline could be Beast Boy adjusting to the social and physical differences of being a girl. For example, how he deals with different clothing styles and the reactions of his friends. Another could be him using his new female form to his advantage in battles, like using the element of surprise.
In a 'Beast Boy and Power Girl in love' fanfiction, it could be that they meet in a cross - dimensional adventure. Beast Boy's ability to adapt to different environments with his powers and Power Girl's overall might would make them a great team. Their love story might develop as they discover new things about each other's worlds. Maybe Power Girl teaches Beast Boy how to better control his powers in high - stress situations, and in return, Beast Boy shows her how to have more fun and not be so serious all the time. Their love could be a symbol of two very different personalities coming together and complementing 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 fanfiction could involve Beast Boy and Storm meeting in a multiverse scenario. Maybe Beast Boy is on a mission in Storm's world and they initially clash due to their different powers and personalities. But as the story progresses, they start to understand and respect each other's abilities and end up working together to defeat a common enemy.
Maybe a girl with a similar power. For example, a girl who can communicate with animals telepathically. They would have a deep understanding of each other because of their shared connection to the animal world. They could go on adventures together, using their powers to help animals in trouble. Their relationship would be based on mutual respect for their powers and a shared passion for animals.
A common theme is the struggle between Beast Boy's humanity and his vampiric instincts. Since he's a beast at heart already, the addition of vampirism can create a complex internal conflict.