Trunks would also be a good choice. He has a connection to Bulla as her brother, and his time - traveling experiences could bring in some complex plot elements. His combat skills and knowledge of different timelines could make for some exciting interactions with Naruto.
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.
Sakura would be an excellent character to include. She could provide medical support in their adventures. Her strong - willed personality would also contrast and interact well with Bulla's more laid - back attitude at times.
One interesting Naruto and Bulla fanfiction could be about them teaming up for a special mission across different dimensions. In this story, Naruto's skills and Bulla's unique abilities would complement each other as they face various challenges along the way.
Sakura could be a great addition. She's a strong kunoichi and her medical skills could come in handy in many situations. For example, if Naruto and Sara are on a dangerous mission, Sakura could be there to heal their wounds. Another good character is Kakashi. His wisdom and experience would be valuable, especially when they face tough decisions or difficult enemies.
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.
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.
Iruka could be included. He was Naruto's first teacher and has his own connection to Kakashi. His presence can bring out the different teaching styles between him and Kakashi. Another good character is Jiraiya. His relationship with Naruto as his godfather and his connection to Kakashi through being comrades can add some interesting storylines.
Sasuke could be a great addition. His complex relationship with Naruto and his own power could add a lot of drama. He might be initially suspicious of Guren and her motives, creating interesting conflicts.
Sasuke could be a great addition. He could be a rival to Naruto even at a young age, and Kakashi would have to deal with their constant bickering. His brooding nature would add an interesting dynamic to the story.
Sakura would be a great addition. As Sarada's mother, she could add an interesting dynamic. Also, Boruto could be included. His relationship with Sarada and his own skills could create some engaging storylines. Another good character could be Kakashi. His wisdom and combat experience could be useful in the story.
Jiraiya would be a great addition. Since he was Minato's teacher, he could share stories about Minato's training days with Naruto. Kushina could also be included as she was Naruto's mother and Minato's wife. Her presence could add more family - oriented moments. Another character could be Kakashi. He was Minato's student too and could provide insights into Minato's character.
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.