Bulma would likely be a main character. As Bulla's mother, she would play a crucial role in guiding and supporting Bulla through this new stage. She could share her own experiences and wisdom with her daughter.
One possible plot could be Bulla's initial confusion and fear when she first gets her period. She might try to hide it from her family at first, not fully understanding what's happening. Then perhaps Bulma discovers it and has a mother - daughter talk with her, explaining the biological process and reassuring her.
The main characters are Bulla and Trunks, of course. Bulla is a strong - willed character, and Trunks is a brave and powerful Saiyan. Their personalities play a big role in how their relationship unfolds in the fanfiction.
Goten could be a great addition. As Bulla's brother, his relationship with Bulla can add an interesting family dynamic to the fanfiction. Also, his Saiyan powers could interact in unique ways with Naruto's ninja skills.
Chi - Chi could be an interesting addition. She has her own experiences with raising a Saiyan - human hybrid (Gohan). She could offer advice to Bulma about pregnancy, child - rearing, and dealing with a Saiyan husband. Another character could be Bulma's father. His reaction to becoming a grandfather and his possible inventions to help with Bulma's pregnancy would add an extra layer to the story.
One possible plot could be Vegeta training with baby Bulla. He could be teaching her the basics of combat in a gentle yet firm way. For example, showing her how to throw a proper punch or dodge an attack. He might also tell her stories about their Saiyan heritage during breaks in the training.
I think Hinata would be a great supporting character. Hinata is very empathetic and kind. She would be there to listen to Sakura's concerns and offer her quiet support. Also, Kakashi could play an interesting role. He might not fully understand what's going on but still offer his general wisdom and support to Sakura in his own unique, laid - back way.
Well, in Goten and Bulla kiss fanfiction, it's often about exploring a different side of their relationship. Maybe it's a moment of unexpected romance. Writers might be trying to show a deeper connection between them that wasn't fully explored in the original series.
A plot could revolve around how the news of Bulma's pregnancy affects the Z - fighters. They could all come together to support her and Vegeta. And as Bulma is pregnant with Bulla, there could be some comical moments where the Saiyan and Earthling cultures clash in terms of baby - related traditions.
Goten is another character. There are fanfictions that depict a romantic relationship between Bulla and Goten. Their different personalities - Bulla's feistiness and Goten's easy - going nature - can create interesting storylines when they are together.
Her best friend could be a main character. This friend might be the first one Lily tells about getting her period and could offer practical advice like which pads are the most comfortable.