Another idea is that the baby has some sort of special powers. Black Widow has to navigate the world of superheroes and villains to find out the origin of these powers and how to keep the baby safe. She might seek help from her former Avengers comrades, but also has to be cautious as some might see the baby as a potential weapon or a liability.
Perhaps the baby was left in her care by a dying friend or ally. Black Widow, initially unsure of her parenting abilities, slowly grows into the role. She could start training the baby in self - defense and survival skills from a young age, all while trying to keep their existence a secret from the villains who would use the baby against her.
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.
Maybe it was someone from her past in the Red Room. There could have been a forced relationship during her training days, and the consequences are now the baby. This would add a lot of drama and a darker tone to the fanfiction as she has to deal with this part of her traumatic past while raising the child.
One possibility is that the story focuses on Black Widow's internal struggle as she tries to get back to her normal self after the concussion. She might have to face her own fears and insecurities, and the other Avengers could play different roles in helping her through it. For example, Captain America might offer her words of encouragement, while Tony Stark could use his technology to monitor her recovery. And Hawkeye could be there as her old - time friend to cheer her up. The story could also involve some villains trying to take advantage of her weakened state, which would add some action and suspense to the fanfiction.
Perhaps a storyline where the baby is raised in secrecy. Hawkeye and Black Widow are constantly on the run to keep the baby safe from their enemies. The baby grows up learning survival skills from them. And as the baby gets older, it starts to show signs of wanting to be part of the superhero world, despite the risks. It could also involve the baby having to face some internal conflict, being half - Hawkeye and half - Black Widow in terms of abilities and personality.
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.
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 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.
One possible plot could be that Sirius Black discovers he has a baby unexpectedly. Maybe it was a result of a past relationship he had before his time in Azkaban. He then has to learn how to be a father while also dealing with the wizarding world's reaction to his new situation, as many might still be suspicious of him.
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.