White Diamond was one of the four main Diamonds. She was extremely powerful and had a very controlling nature. She believed in the strict hierarchy of the Gem society. For a long time, she saw herself as superior and was involved in many of the oppressive practices in the Gem world, like creating the system that subjugated other Gems.
Well, perhaps in the fanfiction, Steven meets White Diamond when he's on a quest to understand more about the Diamonds' past. White Diamond is initially cold to him, but Steven's kind heart and unique perspective start to break through her icy exterior. They could end up having a deep conversation about forgiveness and change, which might lead to a new alliance or at least a better understanding between them.
It could be another gem who doesn't want Steven and White Diamond to form an alliance. Maybe a rogue gem who fears that their combined power would disrupt the current power balance in the gem universe.
In fanfiction, Black Diamond's story can be used to explore themes like redemption and forgiveness. If she was once a tyrant, her journey towards becoming a better being can be a powerful narrative. It can also show how the other characters in the Steven Universe world react to her change, whether they are skeptical or accepting. This can create interesting character dynamics.
In Steven Universe fanfiction, Black Diamond is often depicted as a very powerful and mysterious character. Some fanfictions might explore her past, her relationship with the other Diamonds, and how she might interact with the main characters like Steven. For example, she could be portrayed as a reformed villain who is trying to make amends for her past actions.
Power and responsibility is also a theme. Given that Steven has unique powers and Blue Diamond has her own vast power and influence. Fanfictions often explore how they use or should use their powers and the responsibilities that come with them. In some stories, they work together to solve problems that require both of their powers and the right mindset to take on the associated responsibilities.
A major theme is often power. As Pink Diamond, Steven has a different level of power and influence. Fanfictions might explore how he uses or misuses this power. Also, relationships are a big theme. His relationships with the Crystal Gems, his human friends, and even his enemies might change because of his new identity. For instance, his relationship with Garnet could be affected as she was made in part by Pink Diamond. There could be a lot of emotional turmoil and growth in these relationships.
Well, it depends on what you're looking for in a fanfiction. Some 'Steven is Pink Diamond' fanfictions are more action - packed, with Steven using his new - found power and status to fight against new threats. Others are more character - study - like, delving into his internal struggles and how he copes with being Pink Diamond. You really have to dig in and read a few to find the ones that suit your taste.
Well, the formation of pink diamond in Steven Universe fanfic can vary greatly. Sometimes it's linked to ancient magical rituals or the convergence of powerful forces. It all depends on the creativity of the author.