The plot could involve Ruby finding a balloon that has strange powers. For instance, it might allow her to fly, which is something she doesn't normally do without her scythe's recoil. This new ability could change the way she approaches battles and exploration in the RWBY world.
A possible plot could be that an evil force has created a balloon - like entity that is causing chaos in the RWBY world. Ruby is the only one who can stop it because she has a special bond with balloons (maybe from her childhood). She has to use her combat skills, along with her wits, to defeat this balloon - entity and restore peace to the world. Along the way, she might learn more about herself and the true nature of the power within her.
There could be many interesting fanfictions with this combination. Maybe in the fanfic, Ruby discovers a magical balloon that can transport her to different realms in the RWBY universe. It could be a tool for her to explore new areas or even a key to unlocking some hidden powers.
It could be that Ruby has to deal with the consequences of a major decision she made in the past. This causes her to question her leadership skills and she embarks on a journey of self - discovery to become a better leader for her team.
Well, one possibility could be that Ruby gains a whole new level of guidance. Ozpin might introduce her to secrets of the world she never knew. Maybe he trains her in unique ways, using his vast knowledge and experience, which helps Ruby become an even more powerful huntress in the long run.
One possible plot could be that Ruby discovers Yamato in a strange new world or dimension within the RWBY universe. She has to figure out how to use it or control it while also facing the challenges that come with it, like other Grimm or villains being attracted to the power of Yamato.
One possible plot could be Ruby initially trying to hide her Grimm part from her friends. As she struggles with newfound abilities and instincts, she has to constantly fight the urge to give in to the Grimm side. Meanwhile, a powerful enemy emerges that she might be uniquely suited to defeat because of her Grimm part, but she has to first come to terms with it herself.
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.
Well, one possibility is that Ruby could be influenced by a powerful and evil relic. Maybe she discovers a dark side of the relic's power and becomes corrupted by it, gradually turning evil as she starts to value power over her friends and the greater good.
If Ruby joins Roman in the fanfiction, it might start with Ruby being tricked by Roman. He could pretend to have some information that Ruby desperately needs, like the location of a powerful relic that is about to be used for evil. Once she's with him, she realizes that his ways are completely different from hers. However, she decides to stay for a while to gather more intel. During this time, she has to constantly resist his attempts to make her more like him in terms of being less rule - bound.
Well, it could involve Ruby being influenced by an evil force in this fanfic. Maybe she's taught dark magic or has her moral compass twisted. For example, she might start seeing the world in a more cynical way and use her powers for less noble purposes.
In this fanfiction, Ruby could become a teacher. She would teach the next generation about the history of the huntsmen and huntresses, as well as the importance of unity and courage. By passing on her knowledge and values, she still plays an important role in the fight against the Grimm, just in a different way than being a huntress. She could inspire students to become great huntsmen and huntresses, and also share her combat experiences to help them in their training.