Well, in a fanfiction where Peter Parker turns into a kid, perhaps he could end up at his old school. He'd be faced with bullies again, but this time he has the knowledge and experience of being Spider - Man, even if he's in a kid's body. This could lead to some interesting scenarios where he uses his smarts to outwit the bullies without using his powers directly. Or, he could befriend his younger self's friends in a whole new way, seeing them from a different perspective.
One common theme is identity struggle. Peter has to deal with being both a werewolf and Spider - Man, which can be very conflicting. Another theme is the power struggle, as he has to learn to control his werewolf powers. And often, there's the theme of secrecy, as he has to keep his werewolf identity hidden from most people.
Well, the consequences could be far - reaching. In the superhero world, his absence as the full - fledged Spider - Man could lead to a power vacuum. Villains might become bolder, thinking Spider - Man is gone. On a more personal level, Peter as a kid might struggle with his identity. He's used to being a responsible superhero, but now he's a child again. He might have to relearn how to control his powers as they could be affected by his new physical state. And his relationships with love interests would also be affected. They might see him as a cute kid rather than the man they were attracted to, which could create some really interesting and complex storylines.
One great werewolf Peter Parker fanfiction is 'The Werewolf Within'. It explores Peter's struggle with his new werewolf nature while still trying to be the friendly neighborhood Spider - Man. The story delves deep into how he manages his dual identity and the challenges he faces in protecting his loved ones from his newfound wild side.
MJ (Mary Jane) is often a common character. She would have a very different dynamic with Peter as a girl. Also, Aunt May is usually there. Her relationship with Peter would likely change in interesting ways, as she might have different concerns and advice for a female Peter. Another common character could be Ned. His friendship with Peter would be different, and he might be one of the first to notice the changes in Peter's behavior due to the gender swap.
One possible plot could be that Peter Parker's transformation into a spider is a permanent one. He has to deal with not just his regular superhero duties but also the new challenges of being part - spider all the time. Maybe he has to learn new ways to communicate with other spiders to gain some special knowledge or power.
Well, perhaps in the fanfiction, Peter's memories as an adult are still somewhat intact in his baby form. So he tries to communicate with his loved ones in his own baby - like ways, like making specific noises when danger is near or trying to write in a very clumsy way. This could lead to some really cute and interesting interactions.
One interesting plot could be Peter adjusting to the social differences. As a girl, she might face different expectations in school or among friends. For example, she may notice different treatment from teachers or classmates. Another plot could involve her superhero activities. Maybe she has to adapt her fighting style to fit her new physical form, or deal with villains who react differently to a female Spider - Person.
The main antagonist could be Doctor Octopus. He might see Peter's new form as an interesting specimen to study and wants to capture him for his own evil experiments. He could use his mechanical arms to try and trap Peter in his spider form.
His relationship with MJ would become very different. Instead of a romantic partner, she might become more of a protective caretaker. She would have to deal with a baby - like Peter, which could be both challenging and endearing.