In the 'Twilight: Rosalie Finds a Baby' fanfiction, the baby's significance could be multi - fold. It could be a way to humanize Rosalie further. As a vampire, she has lost much of her humanity, but taking care of a baby could bring out her more human side. The baby might also be a link to the human world that Rosalie has distanced herself from. It could also be that the baby is a plot device to introduce new conflicts or relationships. For example, if the baby has a family that is searching for it, it could lead to Rosalie having to interact with humans more, which is always a complex situation for vampires in the Twilight series.
Since I haven't read the 'Twilight: Rosalie Finds a Baby' fanfiction, I can only guess at what it might entail. It could be that Rosalie discovers the baby in a dangerous situation, like in the woods near Forks. And then she decides to protect it. It might also explore how her vampire nature interacts with this newfound responsibility of taking care of a baby. Maybe she has to hide it from the other vampires or deal with the baby's family if they're involved.
Well, in fanfiction, Rosalie and Emmett's daughter could have a very different personality from her parents. Maybe she's more of a peacemaker compared to Rosalie's sometimes fiery nature. She might befriend humans more easily, which could cause some tension within the vampire family as they try to keep their existence a secret. It could also lead to her having her own set of adventures, like trying to find a way to co - exist with humans without breaking the vampire laws.
A characteristic is the exploration of their emotional connection. Since they are both vampires, they have a unique bond. Fanfictions might explore how they deal with their immortality together. Some stories also focus on Rosalie's past traumas and how Emmett helps her heal. They often have a lot of romantic and passionate moments, which are a big draw for readers.
One common theme is friendship. Often, the OC forms a strong bond with Rosalie. Another theme is self - discovery. The OC might be on a journey to find out who they are, and Rosalie may play a part in that.
One main theme is self - discovery. Rosalie, in these fanfictions, often tries to figure out who she is beyond her vampire nature while being domestic. Another theme is family. As she takes on a more domestic role, her relationship with the Cullen family members is explored more deeply.
One possibility could be that their daughter has special powers. In the Twilight universe, it's not unheard of. Maybe she has a unique ability to control the elements, which sets her apart from other vampires. This could lead to a whole new set of adventures and challenges for her as she tries to keep her powers a secret from the human world while also dealing with vampire politics.
The baby could be an alien species that Goku has never encountered before. It might have special powers related to its alien origin, like the ability to control energy in a different way than Goku and his friends.
The baby could be an ordinary human baby that has some sort of latent magical ability that Raven senses. She then decides to protect the baby from the human world that may not understand or accept the baby's potential magic, and also from the magical world that might want to exploit the baby.
The baby could be an orphan from a nearby village that has been attacked. Kagome stumbles upon the baby while on her travels with Inuyasha. Since she has a big heart, she can't just leave the baby there, so she takes it with her.