A lesser - known 'Inuyasha finds a baby' fanfiction is set in a different timeline. Inuyasha finds a baby that seems to be from the future. The baby's presence causes a stir in the feudal era as everyone tries to figure out where it came from and what its purpose is. This fanfic is full of mystery and adventure as Inuyasha and his friends try to solve the mystery of the baby.
Maybe the baby turns out to be a key to some powerful magic. Inuyasha then has to figure out how to use the baby's connection to this magic without putting the baby in danger. He would have to work with Kagome and the others to understand this mystery. This would lead to a lot of adventures as they travel around to find clues about the baby's true nature. It would also create some interesting character dynamics, like how Sango and Miroku would react to this situation.
Sesshomaru would raise the baby with a combination of discipline and protection. He would protect the baby from any threats, using his powerful abilities. At the same time, he would discipline the baby when it made mistakes, teaching it the ways of the demon world. Inuyasha, on the other hand, would add a more carefree and emotional touch to the parenting, creating a balance in the baby's upbringing.
In fanfiction, the baby could be the key to unlocking some long - lost secrets in the Inuyasha universe. Since Sesshomaru and Inuyasha have such complex histories and lineages, the baby might hold the answers to ancient prophecies. It could also have a special bond with the Jewel of Four Souls, perhaps having a unique way of controlling or protecting it that neither of its parents had. And of course, there would be all kinds of emotional drama as the two brothers - turned - co - parents deal with their new relationship.
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.
The baby could be a lost elf child from a different part of the forest. Maybe their family was attacked by some dark force and Thranduil finds them by chance.
The baby could be a half - demon, related to some other important character in the series. Maybe it's the offspring of a character Sesshomaru has some history with.
I'm not sure of a specific titled fanfiction exactly like this, but there could be many on platforms like Archive of Our Own. You can search for tags like 'Sesshomaru', 'Baby Kagome', 'Found Family' to narrow down the results. It's likely that in such a fanfiction, there would be a lot of cultural clashes as Sesshomaru is from a very different world than Kagome, which could make for some interesting plot points.
I'm not sure specifically as I haven't read that particular 'lucy finds a baby fanfiction'. It could be about a character named Lucy who discovers a baby in a story that is fan - created. Maybe it's in a fictional world where she stumbles upon an unexpected baby and then various adventures or emotions unfold from there.
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.