Adam could start off as his usual self - confident and somewhat aggressive self. But as he spends more time with the Faunus Reader, he might become more vulnerable. The Reader, on the other hand, might start as naive but grow into a more assertive character, standing up to Adam when necessary. For example, if Adam wants to carry out a violent act in the name of Faunus rights, the Reader could try to change his mind.
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.
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.
Common themes include the idea of forgiveness. Given Adam's actions, whether Blake can forgive him is a big part of many fics. The past also haunts their relationship, so the theme of past traumas and how they affect the present is common. And there's the theme of identity. Both characters are on a journey to discover who they are, and their relationship impacts this journey.
The power dynamics play a big role. Ruby has her own unique abilities with her scythe and semblance, and Adam has his sword skills and semblance too. How they use their powers in relation to each other, whether in combat or cooperation, is important in the fanfic.
A 'rwby faunus slave fanfic' could be about the hardships that Faunus face in a world where they are treated as slaves. It might detail their daily lives, how they are oppressed by others, and their attempts to resist or escape their enslaved status. It could also involve the relationships they form with other characters, either those who support their fight for freedom or those who enforce their slavery.
A sense of belonging is also a frequent theme. Adam has often been an outsider in the Supernatural world, and the reader can be the one to make him feel like he belongs. Whether it's within a family - like group of hunters or just in a relationship, the idea of Adam finally finding his place, with the help of the reader, is something that many fanfics explore.
Romance is a very common theme. Since it's an 'x reader' format, it often focuses on the relationship between the reader and Adam Driver's character, with elements like love at first sight or slow - burn romances.
You can try some popular fanfic websites such as Archive of Our Own (AO3). It has a large collection of RWBY fanfics, and you can easily search for 'rwby adam x ruby fanfic' using the search bar. There are likely to be many different takes on this pairing there.
One popular 'rwby adam x ruby fanfic' might be those that explore the complex relationship between Adam and Ruby in a non - romantic way, like a story where they have to team up against a common enemy. This could show their different fighting styles and how they gradually come to respect each other.