One possible theme could be wealth. Since it's a diamond city, wealth would be a prominent aspect. The story might explore how people are affected by extreme wealth, whether it makes them greedy or more generous.
One possible theme could be about discovery. If Abagail King is on a journey to find the diamond, it could be about the discovery of something precious and what that means.
It could be a tale of adventure and discovery in a city known for its diamonds, maybe involving characters seeking precious gems or uncovering hidden secrets related to them.
One possible theme could be self - discovery. As Claude navigates the city, he might learn more about himself. Another theme could be urban vs rural, if Claude is from a different kind of place.
A theme of transformation could be in a 'a bull city story'. For instance, if the city was once a small rural area relying on bull - driven agriculture and then transformed into a modern metropolis, the story could show how the relationship with bulls changed over time. This could involve changes in how the bulls were used, how they were perceived, and what role they played in the city's evolving identity.
A third possible theme could be identity. Kansas City has its own unique identity, and the story may be about how the city's culture, traditions, and values contribute to that identity, and how the people of Kansas City identify with their city.
Another theme might be the contrast between rural and urban life. If Maedon is from a different place, the story could explore how the city is different. It could also be about friendship. Maedon may meet various people and form deep friendships in the city.
A theme could be sacrifice. Pearl might have sacrificed a lot for Pink Diamond. In the fanfic, this could be explored in detail, like how she gave up her own freedom or desires to serve Pink Diamond. Also, the theme of identity could be present. Pearl's identity was so tied to Pink Diamond, and the fanfic could show how that affected her sense of self.
I'm not sure specifically what the 'nexus diamond city story' is about as it could be a very unique or self - created concept. It might be a story set in a city named Diamond City with some kind of nexus, which could be a central point, connection, or something special in that city's context.
It's about the various adventures and events that occur within Diamond City in the Fallout 4 world. It could involve the characters there, their struggles against the post - apocalyptic threats like raiders and mutants, and the political or social dynamics within the city.
Another theme might be community. They could be shown working closely with the Yokohama community to prevent crime and build a safe environment.