Well, there are also the martial arts masters that are part of the Ranma universe. They could be involved as they might notice something different about Ranma. For example, Cologne might have some special insights or tasks for Ranma now that she's stuck as a girl. And the other students at the dojo could also have various reactions, from confusion to amusement, which would add to the story.
In addition to the main ones, characters like Shampoo and Ukyo might play important roles. Shampoo, who has her own feelings for Ranma, may have a different approach to a female - Ranma. Ukyo too, might have a new dynamic with Ranma in this situation. And of course, there could be other minor characters from the original series that get involved in the fanfiction, depending on the author's creativity.
One of the common characters is Cologne. She has a lot of knowledge and wisdom, so she might be involved in trying to figure out what happened to Ranma or she could be using Ranma's new form for her own purposes. Nabiki is also likely to be in these fanfics. She might try to profit from Ranma's situation, either by selling the story or using it to her advantage in some other devious way.
Well, Naruto is the main one. But also, Kakashi could be involved. He might be a bit amused at first but then help Naruto figure out how to use his new body to his advantage in combat. And then there's Hinata. She could have an interesting reaction, perhaps being more shy around Naruto as a girl, or she could be more empathetic as she also has her own insecurities.
Obviously Ranma herself. Her father Genma could also be a major character as he has to deal with his daughter's new permanent state. Akane could be there too, and their relationship would likely be very different. Instead of the typical boy - girl rivalry, it could turn into a more complex female - female dynamic.
Ranma is the key character, of course. But characters like Shampoo and Ukyo might also be deeply involved. Shampoo might see Ranma as a rival in a different way now, or perhaps try to befriend her more sincerely. Ukyo could also have a change in her feelings towards Ranma, either becoming more protective or having a more complex emotional struggle. And don't forget about the various martial arts masters who might interact with Ranma differently because of her new gender.
One possible plotline could be Ranma trying to participate in all - female sports teams or activities while stuck as a girl. Another could be the comical misunderstandings that arise when her male friends don't recognize her at first.
There could be a new character introduced, like a female mentor. This mentor could be someone Ranma meets on her journey as a girl. The mentor could teach Ranma about the ways of the world as a female, help her develop her skills further, and be a guiding figure in her new life. This new character could add a lot of depth to the fanfiction and be an important part of Ranma's growth and development.
There could also be some original characters created for the fanfiction. For example, a new student who befriends Harry when he is dressed as a girl and has no idea that it's actually Harry Potter. This new character could add a whole new dynamic to the story.
The main characters usually include Ruby, Weiss, Blake, and Yang. Ruby, as the team leader, often takes on a role of trying to keep everyone motivated. Weiss, with her aristocratic background, might bring in some class and strategic thinking. Blake, being the more reserved and stealthy one, can be crucial for sneaking around or finding hidden paths. And Yang, with her strength and brashness, is great for combat situations when they are stuck together and facing threats.
Obviously, the wonder girls themselves are the main characters involved. They could be from different teams or generations of wonder girls.
In some 'Ranma stuck as girl fanfic', a great plotline is Ranma's exploration of his new - found femininity. He may start to understand the challenges that girls face on a daily basis, like dealing with clothing and appearance standards. He could also have to deal with the cattiness and competitiveness among girls. This self - discovery journey can be filled with humor, as he tries to adapt to this new state while still being his male - self at heart.