It could be a relatively unknown fan who has a passion for Beast Boy's character. They might be someone who has always been intrigued by his unique abilities and thought that a story about him reading a book would be an interesting concept.
It could also be a collaborative effort. Maybe a group of friends who are all fans of the Teen Titans got together and decided to write a fanfiction about Beast Boy reading a book. Each person could have contributed different ideas to make the story more diverse and engaging.
One interesting concept could be Beast Boy reading a magical book that transports him to different dimensions. This would open up a whole new world of adventures for him.
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.
It could be an ancient and powerful wizard. Maybe the wizard sees potential in Beast Boy and decides to grant him new powers to help him in his fight against evil.
It could be Slade. Slade might manipulate situations to make Beast Boy look bad in front of his friends. He could spread false rumors or set up situations where Beast Boy fails, which would make Beast Boy angry at being wrongly accused and at the fact that his friends might start to doubt him.
One great Beast Boy x Raven x Terra fanfiction is 'The Unlikely Trio'. It beautifully explores their complex relationships. The author does a wonderful job of showing how Beast Boy's light - heartedness, Raven's stoicism, and Terra's in - between state of self - discovery interact.
The author of 'Male Jia Li' was Jia Pingao.
The author of The Boy Jia Li was Guo Jingming.
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.
It could be Trigon. Since Raven has a connection to him, he might see the baby as a way to get revenge on Raven or as a powerful tool for his evil plans. He could try to corrupt the baby's powers for his own use.
The main villain could be a time - traveling version of one of his regular foes, like Slade. Maybe Slade from the future has developed a way to manipulate time and he's going back in time to stop Beast Boy from ever becoming a Titan or to change events in his past that will make him easier to defeat. Another option could be an ancient evil that was sealed away in the past and Beast Boy's time travel accidentally releases it. It then tries to take over the present by changing key events in history. And it could also be a future version of Beast Boy himself who has been corrupted by power and is trying to change the past to make himself even more powerful.