In certain Steven Universe human military fanfictions, there's the concept of a joint military - Gem task force. This task force has to deal with threats that neither the military nor the Gems could handle alone. It involves a lot of character development as the members from different backgrounds learn to work together. There are also cultural clashes and the need for mutual understanding, which makes for a really engaging read.
One interesting concept is the exploration of different character relationships within the human zoo setting. For example, how the gems interact with the humans they've captured. Another is the potential for human resistance or adaptation in such a strange situation. And there could be the discovery of unique powers or knowledge that the humans gain from being in the zoo.
One great Steven Universe human military fanfiction is 'The Garnet Initiative'. In this story, the human military teams up with Garnet to face a new alien threat. It has a really interesting take on how the military would interact with the Gems.
Well, in 'human and universe 6 fanfiction', one interesting concept could be the unique cultures that might exist in Universe 6. Maybe there are species with extraordinary abilities that interact with humans in ways we can't even imagine. For example, they could have a form of communication that is based on energy transfer rather than spoken words.
One interesting concept could be the unique powers and abilities of self - insert original characters (SI OC). For example, an OC might have a special gem - related power that is different from the main characters in Steven Universe. Another concept could be the relationships they form. They might have a complex friendship or rivalry with the existing characters like Steven, Garnet, or Pearl.
One interesting concept could be exploring the backstory of Black Diamond. Maybe in fanfiction, it reveals how she came to be so powerful and what her role was in the history of the Gem world.
One interesting concept could be the characters' reactions to each other's unique worlds. For example, the nations from Hetalia experiencing the Gem society in Steven Universe. The different cultures and powers would create a lot of fun interactions.
One unique feature is the blend of the magical elements from Steven Universe with dragon lore. For example, a dragon might have powers related to the Gems. Another is the potential for new character dynamics. A dragon character can interact with the existing cast in unexpected ways.
Another idea is a human OC who is a detective in Beach City. They start to notice strange happenings that are related to Gem activity. As they dig deeper, they get involved with the Crystal Gems and become an ally. They could use their detective skills to help the Gems solve mysteries, like finding missing Gem shards or uncovering the secrets of an ancient Gem structure.
In Steven Universe fan fiction, there are often concepts about new Gem fusions. Fans like to create their own unique fusions and describe how they would interact with the existing characters. Also, there are ideas about the Gems adapting to human culture in more extreme ways. For instance, a fan fiction could show Pearl trying out every single human hobby in a hilarious attempt to understand humans better. And of course, there are stories that explore the love and friendship among the characters from a different perspective, like the deep bond between Garnet and Amethyst that might be shown in a new light.
A common concept is the character interactions in steven universe crossover fanfic. Writers often like to see how Steven would get along with characters from different shows. For instance, if there was a crossover with My Little Pony, Steven might have interesting conversations with Twilight Sparkle about magic and friendship. Some fanfics also focus on the world - building aspect, like how the Gem world would merge with the world of another show in a crossover.