In the fanfiction, the mystery girl's navel could be a mark of her true origin. It could have a unique shape or color that is related to a long - lost civilization in the Steven Universe. As the story unfolds, she has to figure out what this mark means and how it ties to her place in the universe. This could involve her going on a quest to find answers, facing many challenges along the way.
Perhaps the navel in the fanfiction is a portal. The mystery girl doesn't know about it at first. But then strange things start to happen around her navel area. Eventually, she realizes that she can use it to travel to different dimensions or places within the Steven Universe realm. This could lead to all kinds of adventures and encounters with new characters.
A possible element in such a fanfiction could be a hidden gemstone in the mystery girl's navel. It could be a new type of gem that has powers unknown to the Crystal Gems. The story could revolve around the discovery of these powers and how they affect the balance in the Steven Universe world.
I'm not sure if there are a lot of specific fanfictions just about the mystery girl's navel in Steven Universe. However, it could be an interesting concept for a story. Maybe the navel could be a unique feature that has some kind of magical or symbolic meaning in the fanfiction. For example, it could be the source of her power or a connection to an ancient secret.
Perhaps she's a time - traveler from a future where the events in Steven's world have led to some big changes. She could be on a mission to prevent a certain catastrophe from happening, and her presence in Steven's time is a crucial part of that plan. She might have knowledge of future events and technologies that seem strange to Steven and the others.
In a small corner of Beach City, the Mystery Girl set up a little booth selling handmade jewelry. Steven was curious and went to check it out. He saw that the jewelry was made with some unique gemstones that he had never seen before. The Mystery Girl told him that she had collected these stones from all over the world during her travels. As they talked, Steven noticed that she had a small tattoo on her wrist that looked like a gem symbol. He asked her about it, but she just smiled and changed the subject. This made Steven even more determined to uncover the secrets of this fascinating girl.
One possible plot could be that Pearl is initially very curious about the Mystery Girl. She might observe her from a distance, trying to figure out her habits and what makes her so mysterious. Then, they could accidentally meet, and at first, Pearl is a bit clumsy in her interaction due to her own insecurities. But as time goes on, they start to bond over shared interests like music or art. The Mystery Girl could introduce Pearl to new aspects of human culture that Pearl has not fully experienced yet.
A simple plot could be Baby Steven getting lost in the woods near the Crystal Gem base. He encounters some friendly forest creatures who help him find his way back. As he wanders, he discovers new magical elements in the forest that the Gems didn't even know about.
One idea could be that Pearl and Mystery Girl team up to solve a mystery on Earth that involves Gem technology. Maybe they find an ancient Gem artifact that is causing strange phenomena, and they have to figure out how to stop it together.
If Steven turns into a girl in fanfiction, it could change the way he interacts with the other characters. For example, his relationship with Connie might become more complex, as they could explore a different kind of friendship or even a romantic relationship. Also, the way the Crystal Gems protect him might change, as they may see him as more vulnerable in his new form.
One idea could be that Steven turns into a girl due to a magical mishap. Maybe he was trying to help a gem with a spell and it backfired. As a girl, he could struggle with how others perceive him differently, but also discover new aspects of his personality. He might have to learn new ways to fight and use his powers, adding an interesting twist to the story.
Pearl could develop greater courage. In the face of new and unknown situations with the Mystery Girl, she has to be brave. This could transform her from being a bit timid in new social situations to being more confident. For the Mystery Girl, she could develop a sense of loyalty towards Pearl. At first, she might be just a curious figure, but as they go through various events together, she becomes a steadfast friend to Pearl, willing to stand by her side no matter what.
One possible plot could be that Steven is kidnapped by an old enemy of the Crystal Gems. Maybe a Homeworld Gem who has a vendetta against Rose Quartz and sees Steven as a way to get revenge. The Crystal Gems then have to go on a rescue mission, facing various obstacles along the way.