Well, surely the girl herself is a main character. She is the one whose life is going to turn around. There might also be a best friend character. This friend could be there to support the girl during her tough times and also be part of her new and improved life. Another possible main character could be a mentor figure, like a teacher or an older relative who guides the girl on her journey of change.
The main character is the girl, of course. She could be a shy and introverted type at the start. Then there may be a boy character who comes into her life. He might initially be a bit of a troublemaker but later becomes a positive influence. And there's probably a parental figure as well, whose relationship with the girl evolves as her life changes.
In the 'Girl Life Turns Around Novel', the central character is the girl. There may be a group of friends that surround her. These friends might have different personalities and backgrounds. One could be really outgoing and help the girl break out of her shell, while another might be more studious and inspire her to focus on her education, all of which contribute to her life - turning - around process.
One interesting plot could be the girl's self - discovery journey. Maybe she starts off in a difficult situation, like being bullied at school. But then she finds a new hobby, such as painting. Through this hobby, she gains confidence and starts to stand up for herself. This change in her character and life situation can be really engaging.
Another character that could be important is one of Ben's enemies who has a different reaction to his new female form. This enemy could either be more or less of a threat depending on how they view Ben now, and their interactions could drive the plot forward in interesting ways.
Obviously, the two angels are the main characters. But there could also be other characters like the humans they interact with or other supernatural beings in their world.
Obviously, the farmer and the girl are the main characters. There might also be other characters like the farmer's family who might be shocked to see a new cow in the barn and not know it was once a girl.
Obviously, Ash and Erica would be the main characters. Ash is the one who undergoes the transformation, so he's central to the story. Erica is the one who causes the change, so she also plays a crucial role.
There could also be new characters introduced in the fanfiction. Maybe a female wizard who befriends Harry in his new form and helps him understand the female side of the wizarding world better. Or perhaps a villain who specifically targets Harry because of his unique transformation, seeing it as a weakness to be exploited.
The girl is clearly one of the main characters. As for the old neighbors, we don't know how many there are exactly. They are the ones involved in this 'passing around' action. There could also be potential secondary characters like the girl's parents. If the story is about the girl being in a difficult situation with the old neighbors, her parents might be absent or unaware, which could be an important aspect of the story. But all of this is just speculation at this point.
One of the main characters could be Shiro. Shiro has always been like a big brother to Keith. So when Keith turns into a girl, Shiro would be there to help him adjust. He'd make sure Keith is safe and comfortable in his new form. Also, Hunk could be a main character. Hunk would probably be the one to offer emotional support and cook some comfort food for Keith during this tough time of adjustment.
Well, of course, the transformed Spider Man as a girl is the central character. But often, his friends like Ned and MJ are still important characters. They might have different reactions to his transformation. Ned could be initially shocked but then super supportive, while MJ might offer some practical advice on how to handle the new situation.
Even fictional characters from English literature could be involved. Sherlock Holmes could be brought into the story to help solve any mysteries that might arise due to England's transformation. He could use his deductive skills to figure out the cause and consequences of this strange event.