Yes, there are quite a few. You can start by looking on popular fanfic platforms like Archive of Our Own. Some fanfics might focus on the Crystal Gems' reactions to Steven's adventures, adding new perspectives and emotional depth to the story.
You can expect to see different interpretations of the characters. The fanfics may show the Crystal Gems having unique reactions to Steven's growth and experiences that weren't explored in the original show.
Cluster Gems are a really interesting part of the Steven Universe universe and in fanfics they can be explored in so many ways. In the official show, they are these really powerful and complex beings. In fanfic, an author might focus on a cluster gem's struggle for identity, since they are made up of multiple gems forced together. For example, a fanfic could be about a cluster gem trying to break free from the control of Homeworld.
In some fanfics, cluster gems are portrayed as tragic figures. They are often the victims of Homeworld's cruel experiments. They can be shown as being in constant pain due to the forced fusion of different gem types.
Well, it could be about a fan - created story where there are witches in the Steven Universe universe who have a connection to crystals. Maybe they use crystal magic in ways that interact with the existing characters and storylines of Steven Universe.
There may be some 'crystal witches steven universe fanfic' stories that are popular within the niche community of Steven Universe fanfic readers. But without doing a thorough search on all the major fanfic websites, it's difficult to name any. Some might gain popularity if they offer a really unique take on the idea, like having the witches be from a parallel dimension where crystals have different properties. They could also be popular if they involve a lot of character development for both the original Steven Universe characters and the new witch characters.
There might be a male gem based on a rare or unheard - of type of gem in the official series. Fanfiction writers often explore his character, giving him traits such as being extremely intelligent but socially awkward. His interactions with Steven, who is very empathetic, make for interesting stories.
You can start by looking on Archive of Our Own (AO3). It has a large collection of fanfics, including many about Steven Universe female gems. Fanfiction.net is also a good place to search. There are often a variety of stories there related to this topic.
There is a fanfic called 'Female Gems' Bond'. It delves deep into the friendships and alliances among the female gems. It shows how they support each other through different challenges. 'The Mysterious Female Gems' is another good one. It explores the backstories of some of the less - known female gems, adding more depth to their characters. And don't forget about 'Female Gems in the Human World' which is all about how they adapt to life on Earth and interact with humans.
In the context of the show's universe, it's a bit of a strange concept. Since fanfiction exists in our real - world fandom and not in the show's world directly. But if we were to imagine a meta - situation where he could access it, I suppose it could be possible. However, it would be a very surreal situation for him.