Sakura would be the central character. In addition, there could be a young and brave local in the opposite world who becomes Sakura's guide. There might also be some shadowy figures that are controlling the chaos in the opposite world and Sakura has to face them to set things right. These characters would all interact with Sakura and shape the story as she tries to navigate this new and unfamiliar place.
Well, it could be about Sakura facing all kinds of strange and magical creatures in the opposite world. Maybe she has to find a way to get back home while dealing with new powers she discovers there.
She could meet her doppelganger. In the opposite world, it's possible that there is a version of herself with different characteristics or a completely different personality.
Sakura herself could be the main character, of course. Maybe we could also have her best friend from the series as the main character, experiencing a year in Sakura's world from their perspective. Another option could be a new character introduced specifically for this fanfiction, someone who is drawn into Sakura's orbit.
One of the main characters could be Sakura's mother. Mothers are often intuitive about their children's problems. She could be the one who eventually helps Sakura open up about her self - harm. Then, there might be a new acquaintance in Sakura's life, someone she meets randomly. This person could have had a similar experience in the past and be able to offer unique advice and support to Sakura.
Tomoyo would also be an important character. She would be very worried about Sakura. She might use her skills in making costumes to create some special baby clothes for Sakura. And she would be constantly by Sakura's side, taking care of her and trying to comfort her.
Maybe an old hermit who has been living in seclusion near a sacred sakura grove. He has been the guardian of the sakura power of nature for years and now has to take on an apprentice to pass on his knowledge and protect the power from those who would misuse it.
The obvious main character could be the Sakura Drowned Princess herself. Her story, her emotions, and her journey could be the central focus.
Obviously, Sakura would be the main character as she is the one who is pregnant. Her partner might also be a main character, depending on the nature of their relationship in the fanfiction.
She might encounter strange creatures. In the opposite world, there could be magical beings that are completely different from what she has known in her own world. For example, there could be talking animals with special powers.
Sakura, a character known for her determination and love for Sasuke in the Naruto universe, is one of the main characters. She is the one who makes Sasuke want her in this fanfiction. Sasuke, a complex and often brooding character, is the other main character. His journey of coming to want Sakura in the fanfiction is what the story might be centered around.