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.
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.
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.
One idea could be that as a girl, Steven has different relationships with the other Crystal Gems. Maybe she forms a really close sister - like bond with Pearl, who becomes overprotective. Another could be that her fusion forms take on a more feminine aesthetic and she has unique experiences when fusing with the others.
In a 'Steven Universe Sapphire Pregnant' fanfiction, perhaps the pregnancy is unexpected. Sapphire could start having premonitions about the future of their unborn child. The story might focus on how the other characters in the show react to the news. Some might be overjoyed, like Pearl who loves new life among the Gems, while others could be more cautious, thinking about the potential dangers in their world.
A 'Naruto meets Steven Universe' fanfiction could start with Naruto accidentally ending up in Steven's world. He'd be shocked by the colorful and strange environment. Steven would be the first to approach him, being the friendly and curious character he is. Naruto would quickly show his combat skills, which would amaze Steven. The Gems might be a bit more cautious at first. But as they learn about Naruto's good intentions, they start to work together. They could share their knowledge of different forms of magic or power. Naruto could learn about gem - based powers and how to use them in combination with his chakra. And they could all go on adventures to protect both their worlds from new threats.
Well, in a 'Steven Universe Garnet Pregnant' fanfiction, the plot could start with Garnet sensing a new life within her. This could lead to a series of events where she has to protect this new life from the threats that the Crystal Gems usually face. Maybe she has to go on a journey to find a safe place for the baby. Along the way, her relationship with the other Gems, especially Ruby and Sapphire, could be explored in a new light as they also prepare for the new addition to their family.
Well, in such a crossover, Steven could use his gem powers to help the Avengers in battles. Maybe his healing powers could be used on the injured Avengers. For example, after a tough fight with a powerful villain like Thanos, Steven could heal Captain America's wounds.