Perhaps a plot where a Faunus is wrongly accused of a crime in Vale, and Weiss, being a Huntress - in - training, decides to investigate. As she digs deeper, she discovers the truth about the Faunus and the real culprit, who is trying to frame the Faunus to stir up trouble between humans and Faunus. This leads to Weiss becoming an advocate for the Faunus's rights.
A plot could be that Weiss meets a Faunus with a special power that she's never seen before. They start off on the wrong foot, but as they are forced to team up against a common enemy, like a new type of Grimm. As they fight side by side, Weiss realizes that the Faunus is not what she expected and they develop a mutual respect for each other.
Maybe a fanfic where Weiss discovers a hidden Faunus community while exploring. She gets separated from her team and has to rely on the Faunus there to survive. This experience makes her re - evaluate her thoughts on Faunus. The Faunus in the community could have unique cultures and abilities that Weiss has never seen before, and she becomes fascinated by them.
I really like 'Weiss and the Faunus Bond'. In this fanfiction, Weiss discovers the unique aspects of Faunus culture through her interactions. It shows her growth as a character as she overcomes her initial prejudices. It also has some great action scenes intertwined with the emotional development.
One theme could be acceptance. Weiss, coming from a more traditional and perhaps elitist background, has to learn to accept Ruby as a Faunus. Ruby, on the other hand, has to accept that Weiss may not immediately understand her situation but is trying. Another theme could be friendship. Despite their differences, they form a strong bond through shared experiences at Beacon Academy.
One plot idea could be that the Faunus OC is initially misunderstood by Weiss. For example, the OC might be a cat Faunus and Weiss has some preconceived notions about cat Faunus being sly. But as they are forced to work together on a mission in Beacon, they start to see each other's true qualities. The OC could show great courage and loyalty, which makes Weiss question her own biases.
One interesting RWBY Weiss Faunus fanfiction could be one where Weiss has to team up with a Faunus character and they initially clash due to their different backgrounds. As they face challenges together, they start to understand and respect each other. For example, they might be on a mission to retrieve a powerful relic and the Faunus character's unique abilities help them get through various obstacles. Another fanfiction might explore a world where Weiss discovers she has Faunus heritage herself and has to deal with the internal struggle of accepting this new identity while still being part of the Schnee family.
One possibility could be that Weiss has been hiding her Faunus traits due to the Schnee family's reputation. The Schnee Dust Company has had a complex relationship with Faunus, and if Weiss were a Faunus, it would be a huge shock to those around her. Maybe she has a small, hidden Faunus feature like a tail or ears that she has to keep concealed all the time. This could lead to some interesting internal struggles as she tries to balance her identity with her family's expectations.
In some fanfictions, the idea of Weiss using her family's influence to advocate for Faunus rights is quite unique. For example, in 'Weiss's Advocacy', she starts a movement within her family's company to promote equality for Faunus. It's an interesting concept as it goes against the typical view of the Schnee family's relationship with the Faunus.
First, do your research on the RWBY universe, especially about Weiss and the Faunus lore. Know their characteristics, powers, and the existing relationships between humans and Faunus. Then, come up with an interesting plot. It could be something like Weiss having to protect a Faunus friend from a group of anti - Faunus hunters. Make your characters believable. Give them flaws and growth. For Weiss, her pride as a Schnee could be a flaw that she has to overcome when dealing with Faunus. Also, use vivid descriptions of the RWBY world, like the unique landscapes and the different Dust - based technologies.
Maybe it could be about Cardin trying to hide his Faunus identity at first. He might struggle with the discrimination that Faunus face in the RWBY world while also dealing with his own personal growth and relationships within the team or at school.
The plot could involve the relationship between Adam and the Faunus Reader in the context of the RWBY universe. Maybe they meet during a Faunus rights protest. Adam, being a controversial figure, might initially see the Reader as a tool for his own radical ideas. However, as the story progresses, they could develop a more complex relationship, with the Reader trying to steer Adam towards a more peaceful path of fighting for Faunus rights.