One possible plot could be that Black Widow, while on a mission, gets hit by some sort of experimental weapon or magic spell that reverts her to a child. She then has to rely on her Avengers teammates to protect her while they search for a way to reverse the effect. Her skills as a child would be limited, but her intelligence might still be intact, leading to some interesting situations where she tries to communicate complex ideas in a child's body.
In this fanfic, the plot could start with Black Widow getting turned into a kid during a fight against a powerful villain. Since she's a kid now, she has to adapt to a whole new world. The Avengers might have to keep her identity a secret to protect her. She could start to see the world from a different perspective as a child, which could lead to character development. For example, she might befriend other children and learn about innocence and friendship in a way she never did before as an adult assassin. And the story could revolve around her journey to get back to her normal self while also growing as a character in this new form.
Well, the plot might involve Black Widow being turned into a kid and then being kidnapped by an old enemy who wants to use her in this vulnerable state. Her friends would have to track her down. As a kid, she might not remember all of her combat training fully, but her instincts could still kick in at times. Maybe she could use her small size to her advantage in sneaking around and leaving clues for her rescuers.
Her relationship with Captain America might become more of a protective one. Cap would see her as a vulnerable child and be extra vigilant in keeping her safe. He might also try to instill some of his old - fashioned values in her while she's in this childlike state.
Well, the plot could involve Pitch Black, now in cat form, trying to navigate a world full of strange new sensations. Maybe he's on a quest to regain his original form. He could be befriending other animals who help him in his journey, and along the way, he discovers the simple joys of being a cat, like chasing mice or lazing in the sun.
Well, one possible plot could be about Midoriya adjusting to life as a girl. She might face challenges in how society views her now. For example, her friends in the hero academy could initially be shocked but then gradually accept her new form. And she could use this new experience to better understand the female perspective in the hero world, which could in turn make her an even better hero.
Well, it could start with Elton Castee being in his backyard. He's unaware that a black widow has made a home near his shed. As he reaches for something, the black widow bites him. This could set off a chain of events. He might first try to identify the spider to know how serious the bite is. Then, he could be faced with symptoms like nausea, sweating, and difficulty breathing. His journey from getting bitten to seeking proper medical attention or trying home remedies could be the main focus of the fanfiction.
Well, he might lose all his evil cunning at first. Since he's a kid, he could start to see the world in a more innocent way. Maybe he'll make friends with people he used to terrorize, not realizing who they are. And he could be easily influenced by good-hearted characters, starting to develop a sense of right and wrong that's completely different from his adult, villainous self.
A possible plot could be that there is a strange lemon - based experiment gone wrong in a scientific facility. Spiderman and Black Widow are called in to investigate. Along the way, they discover that the experiment has given some people lemon - like powers. They have to figure out how to deal with these new threats while also trying to reverse the effects of the experiment. Spiderman uses his agility to avoid the lemon - power attacks, and Black Widow uses her martial arts and weapons to fight back.
Perhaps the fanfic could be set in a post - Endgame world. Black Widow is somehow brought back and she teams up with Okoye to retrieve a powerful artifact that has fallen into the wrong hands. They travel across different realms, facing various enemies. Their different personalities, Black Widow's more sardonic and independent nature and Okoye's loyalty and discipline, would lead to some great character interactions.
The plot could start with Batman investigating some strange activities in Gotham that are linked to a Russian spy ring. This leads him to cross paths with Black Widow who is on a mission for S.H.I.E.L.D. They initially misunderstand each other's motives and end up in a fight. As the story progresses, they realize they are both after a common enemy and team up.
Well, it could be a rather strange plot where perhaps the dog is a friendly stray that encounters the Black Widow. Maybe the dog licks her out of curiosity or a sense of friendliness, and the Black Widow, being a complex character, has an unexpected reaction like being initially startled but then showing a bit of softness towards the dog.
She might be kidnapped by a supervillain who wants to use her skills for his own evil plans. For example, he could force her to break into a highly secure facility to steal some dangerous weapon or technology.