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.
Perhaps a mysterious mentor figure appears. This person has seen the rise and fall of many kingdoms and has come to guide Ruby in her fight against the darkness.
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.
I'm not sure specifically as there could be many different versions of such a fanfiction. But generally, it might involve the character Si being reborn as Ruby and then facing all the challenges and adventures within the RWBY universe. Maybe they would have to deal with Grimm, make new friends like Weiss, Blake and Yang, and also attend Beacon Academy.
It depends on the specific fanfiction. Ruby's location could vary based on the plot and creativity of the author.
One possible plot could be that the characters face a new, more powerful type of Grimm that has abilities they've never seen before. They have to quickly adapt and find new ways to fight. Maybe Ruby discovers a new form of her scythe's power to combat this threat.
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.
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.
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.
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, one possible plot could be that Ruby is trying to boost the morale of her team. So she sings a song that has special meaning to them, like a song from their childhood or a song that represents their unity. This could bring the team closer together and give them the strength to face a difficult battle.