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, a possible plot could be Ruby facing discrimination as a Faunus. This would add a whole new layer of conflict to her character. She could then use her experiences to try and bridge the gap between humans and Faunus in the RWBY world. Also, there could be a plot where Ruby's Faunus heritage is somehow connected to an ancient prophecy or power that she has to unlock.
Well, one idea could be that Ruby's dragon faunus side is awakened by a powerful relic. And then she has to quickly learn to control her new powers. Another is that she discovers she has a special bond with a dragon - like Grimm, which is really strange as Grimm are usually just evil entities. This bond could make her question the nature of Grimm and faunus.
One idea could be Ruby meeting a wolf Faunus who is initially mistrusted by the group but later proves to be an ally. Maybe the wolf Faunus has a special ability related to tracking that helps Ruby and her team in a mission. Another plot could involve a wolf Faunus who is being hunted by some anti - Faunus group and Ruby decides to protect them, which leads to a series of battles and the exploration of the discrimination against Faunus in the RWBY universe.
Well, it could be about Ruby struggling to hide her true nature as a Grimm Faunus while still being a Huntress. Maybe she has to deal with the prejudice from others who fear Grimm Faunus.
One plot idea could be that Ruby, as a Faunus, has some unique abilities related to her Faunus nature that she and Blake discover together. They go on adventures to understand and control these abilities while also strengthening their relationship.
I'm not entirely sure if there is a specific 'RWBY Ruby is a Grimm Faunus' fanfiction. However, given the creativity of RWBY fans, it wouldn't be a surprise. Some fanfictions explore really out - of - the - box ideas, and this could be one of them. You could also check RWBY - related forums where fans might discuss or share such unique fanfictions.
One possible fanfiction could be about Ruby's journey as a Dragon Faunus in the RWBY world. She might face unique challenges, like hiding her faunus traits at first. Maybe she discovers her dragon - like powers gradually, such as enhanced strength or the ability to breathe a small amount of fire in a moment of great stress. Her friends in Team RWBY could initially be shocked but then accept and support her new identity as she learns to embrace it herself.
There are fanfictions where Ruby is a Faunus herself. Maybe she has some kind of cat - like Faunus trait. This would change how her teammates interact with her at first. For example, Weiss might have some initial prejudices to overcome, but as the story progresses, they all come to accept Ruby for who she is, Faunus or not. It could be a story about acceptance and friendship in the face of differences.
One idea could be a story where Ruby, as a Faunus, has to hide her identity in a world that's still somewhat prejudiced against Faunus. Weiss discovers her secret and at first is conflicted because of her family's traditional views. But as they go on adventures together, Weiss realizes that Ruby is still the same brave and kind person she always knew, and they form an even deeper bond.
One idea could be Ruby discovering she has some cheetah - like abilities. Maybe she's faster than ever and has to learn how to control this new power. It could add an interesting dynamic to her combat style and how she interacts with her team.
A third plot idea could be Ruby having to face an ancient vampire threat that is related to her new condition. Maybe she discovers that she was turned into a vampire as part of a bigger plan by an evil vampire lord, and she has to stop this villain while also coming to terms with her own vampirism. This could involve her learning about vampire lore and using it to her advantage.