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.
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.
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.
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.
In terms of the overall story, Weiss being a secret Faunus could open up many new plotlines. For example, there could be a group within the Faunus community who are skeptical of Weiss because of her family's past actions. She would have to prove herself to them. There could also be a sub - plot where Weiss tries to find out more about her Faunus heritage, leading to adventures and discoveries. And her combat style might even change as she embraces her Faunus abilities, if any. This would make her a more complex and interesting character in the RWBY fanfiction world.
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.
A great fanfiction plot could be that Faunus Ruby is being discriminated against by some students at Beacon. Weiss, who is used to a world of privilege, decides to stand up for Ruby. This act of kindness makes Ruby trust Weiss more. As time passes, they find themselves relying on each other more and more during combat and in their studies, and a beautiful friendship (or maybe something more) starts to develop.
One popular theme is the exploration of their different backgrounds. Ruby being a Wolf Faunus and Weiss from a more privileged family can lead to interesting cultural clashes and mutual understandings. Another theme could be adventure. They might go on quests together, relying on each other's skills. Ruby's Faunus abilities like enhanced senses could complement Weiss's combat and magic skills. Also, friendship and the development of a deeper bond is a common theme. As they face challenges, their relationship grows from just being teammates to something much more profound.
To develop their relationship realistically, start with conflict. Since Weiss has some prejudices about Faunus, there should be initial tension. For example, the Faunus OC could be in a group that Weiss believes is causing trouble at Beacon. This will make Weiss avoid the OC at first. Then, through a series of events like group projects or battles where they have to rely on each other, they start to break down those barriers. Small interactions like sharing a meal in the cafeteria or helping each other study can also slowly build their relationship.