Another plot could involve Weiss finding out through some sort of family heirloom or old letter. This discovery could lead to a lot of internal conflict for her. She might question her identity and her place in both her current family and with Qrow. She could also struggle with how the rest of her team, especially Ruby who is related to Qrow, will react to this new information. And Qrow would have to deal with the guilt of not being there for her all these years.
One idea could be that Qrow discovers he's Weiss's father early on. He then tries to secretly protect her while also struggling with how to reveal the truth. Maybe he fears how Weiss will react given her family's reputation and her own relationship with her current family.
One plot idea could be Qrow training Ruby in some special combat techniques that are unique to his own fighting style. This would allow Ruby to gain new skills and also strengthen their bond as family members.
One plot idea could be a gender - swapped Qrow in an alternate universe where she is a mentor to a new group of young hunters. She could have different relationships with the other characters, like a more motherly bond with Ruby. Another idea is that she is on a mission to uncover a conspiracy within the Huntsman academies, using her unique skills and charm.
Another interesting plot could be Qrow dealing with his own personal demons, like his alcoholism, while still being a father figure. He could struggle to set a good example for his child, but through the story, he gradually overcomes his issues. For example, his child might get into a dangerous situation because of his drinking habits, which serves as a wake - up call for him. And he then starts to change for the better to be a proper father.
One idea could be Qrow having to protect an endangered species all on his own. Maybe he discovers a unique Grimm - like creature that is on the verge of extinction and he has to fend off other threats while trying to understand it. Another could be that Qrow is part of a mission to save a group of people who are considered 'endangered species' in the RWBY world due to some new threat, and he has to use his skills and experience to lead them to safety.
Perhaps in this fanfiction, Weiss discovers a strange portal and steps through it, ending up in the Naruto world. She meets Naruto and is intrigued by his ninja abilities. They could start training together, with Weiss learning some ninja techniques and Naruto learning about Dust. Their combined skills could then be used to protect Konoha from a new threat that has some similarities to the Grimm from her world.
A more emotional fanfiction could be about Qrow trying to understand Raven's decision to leave. He could be on a journey of self - discovery as he tries to come to terms with his sister's actions. He might visit the places they used to go together, reminiscing about the good times and trying to figure out where it all went wrong.
There would also be a shift in their dynamic. Instead of just being an acquaintance or someone she looks up to in a way, he would become a parental figure. This could lead to some interesting conversations. For example, Qrow might start giving Weiss advice not just on fighting but also on life and how to deal with her family issues. He could share his own experiences growing up and how to handle the pressure of being part of a powerful family like the Schnees.
One plot idea could be Ruby struggling to hide her Faunus identity at first. Maybe she has cat ears as a Faunus and has to constantly keep them hidden under her hood. Another idea is that she discovers a unique Faunus ability that she has to learn to control. For example, she might be able to communicate with certain animals in a way no one else can.
Well, family bonds are a big one. It's not just about the father - daughter relationship but also how it affects the relationships with other family members like Yang. Another theme is the passing down of skills and knowledge. Since Qrow is a skilled fighter, fanfictions might show him teaching Ruby things in a more personal and fatherly way. Additionally, there can be themes of self - discovery for both Qrow and Ruby as they navigate this new - found family connection.
Another plot could involve Ruby and Weiss, in their Futa forms, having to protect a group of innocent Fanus from a powerful enemy. This would test their combat skills as well as their friendship and teamwork. They could also learn more about the discrimination that Fanus face in the world and strive to make a change.