Well, in such a fanfiction, the other characters like Steven and the Crystal Gems would likely go on a rescue mission. They'd use their powers to track her down. Steven might use his shield to protect them during the search, and Pearl could use her spear skills. Garnet would probably be leading the way with her future vision to find Amethyst as quickly as possible.
In a 'Steven Universe' fanfiction where Amethyst is kidnapped, there could be a lot of emotional turmoil. Steven would be really worried and determined to save her. The fanfiction could explore how the Crystal Gems react under pressure. They might start to question their security measures. And Amethyst, while kidnapped, could make new allies among other captives or learn some dark secrets about the kidnappers, which could be crucial for her escape and for the Crystal Gems to defeat the kidnappers in the long run.
If Amethyst gets kidnapped in a 'Steven Universe' fanfiction, it could lead to a lot of character development. Amethyst herself might discover new things about her strength while trying to escape. The kidnappers could be an old enemy of the Crystal Gems. Maybe the Diamonds are behind it, trying to get some leverage against the Crystal Gems. The other gems would then have to figure out how to deal with such a powerful foe to save Amethyst.
Well, in such a fanfiction, the other Crystal Gems might go on a frantic search for Amethyst. They could face many challenges along the way, like dealing with new enemies or having to make difficult choices to get her back.
Perhaps some remnants of Homeworld's military that still hold a grudge against the Crystal Gems. They might think that by kidnapping Amethyst, they can force the Gems to stop their activities on Earth or give up some valuable information.
Another option is that it's a human who has somehow discovered the existence of Amethyst and the other Gems. This human could be a mad scientist type who wants to study Amethyst's unique gemstone and abilities. He or she might not understand the full implications of what they're doing and just see Amethyst as an interesting specimen to experiment on.
He would probably have a very mixed reaction. On one hand, seeing how fans view his world and his story could be really cool. He might enjoy seeing different versions of himself and his friends. However, if there are inaccuracies or things that go against his values in the fanfiction, he could also be a bit put off. It really depends on the nature of the fanfiction he's reading.
Adventure is also a common theme. They go on different quests or face various threats together. This could be something like exploring an ancient gem ruin on Earth or fighting off a new enemy. The theme of acceptance is important too. Accepting each other's flaws and differences. Amethyst accepting Steven's sometimes naive view of the world, and Steven accepting Amethyst's wilder side.
In Steven Universe fanfiction, the relationship between Steven and Amethyst can be really interesting. They are both very different characters. Steven is kind - hearted and has a strong sense of justice, while Amethyst is more of a free - spirited and somewhat rebellious character. In some fanfictions, their relationship might develop into a deep friendship where they support each other through different challenges. For example, Steven could help Amethyst come to terms with her insecurities about being a 'lesser' gem compared to the others.
A common theme is innocence. Since she's a baby amethyst, the fanfictions often explore her naivete and how she discovers the world around her. Another theme is growth. It shows how she develops her gem powers and her personality over time. Also, the relationship with the Crystal Gems is a big theme, like how they protect and guide her.
In fanfiction, if Deku gets kidnapped, his friends from U.A. High would likely launch a rescue mission. Bakugo might be especially determined, as much as he tries to hide his concern. They would use their quirks in creative ways to track Deku down.
In the 'tsuna gets kidnapped fanfiction', perhaps his friends would immediately start a rescue mission. They might use their unique skills and powers to track down where Tsuna is being held.
Well, it's very possible. 'Steven Universe' has a huge fan base, and fanfiction writers love to explore different and often extreme scenarios. Kidnapping can be a plot device to create drama, tension, and character development. To find such a fanfiction, you could also search on Tumblr, as some fans might share links or excerpts there. Just be sure to check the tags and ratings to make sure it's appropriate for you.