Well, perhaps in the fanfiction, Spiderman saves a woman who later turns out to be pregnant with his child. He doesn't know about it until she shows up at his doorstep with the baby. Spiderman then has to figure out how to take care of the baby. He might start using his web - slinging skills in new ways, like creating a safe web - hammock for the baby to sleep in while he's on patrol, and he has to deal with the reactions of his friends and allies, like Mary Jane or Ned.
One possible plot could be that Kratos discovers he has a baby in a very unexpected way. Maybe he finds the baby left at his doorstep. He initially has no idea how to take care of it but as time passes, he starts to learn and forms a strong bond with the baby. He protects the baby from all the threats in his dangerous world.
Maybe Clementine discovers she's pregnant unexpectedly. She then has to deal with the physical and emotional changes during pregnancy. After giving birth, she has to protect her baby from various threats, both human and non - human. She might train her baby from a very young age to be strong and survive in their difficult circumstances.
One possible plot could be that Stiles discovers he has a baby unexpectedly. Maybe an old fling left a baby on his doorstep. He then has to learn how to be a father while still dealing with his normal life, like school and his friends. He might struggle at first with things like changing diapers and getting up in the middle of the night, but with the support of his friends, he slowly gets the hang of it.
Perhaps it could be a character from an alternate dimension. In some fanfiction scenarios, portals open between different dimensions, and Spiderman could have had an encounter with a female character from another world, which led to the baby.
Maybe in the fanfiction, the father of the baby is a mystery. Clary has to deal with the speculation and rumors around who the father could be while also taking care of her little one. It could add a lot of drama to the story as she might face accusations or unwanted attention.
In a more emotional plot, Sally could be worried about bringing a baby into the world of racing, fearing for its safety. She has to overcome these fears with the support of her friends. She could also be thinking about teaching the baby all about the history and values of Radiator Springs when it grows up.
One possible plot could be that Black Widow discovers she has a baby unexpectedly. Maybe it was a result of some sort of experiment she was involved in long ago without her knowledge. She then has to figure out how to protect the baby from various threats, like the enemies she has made over the years in her dangerous lifestyle.
Well, the plot could be that the baby is in a high - rise building that's on fire. Spiderman swings in, using his web to create a sort of cradle to catch the baby as it's being passed out of a window by a desperate mother. Then he safely descends the building with the baby in his arms and hands it over to the paramedics waiting below.
One possible plot twist could be that the baby has some sort of special power. Maybe it's a power that is not known in their world and it causes all kinds of chaos and confusion. People might be scared or intrigued by the baby.
Maybe Peter gets tired of the double life. He realizes that being Spiderman has cost him too much, like his normal relationships or his own mental health. So he decides to give up the mantle.