One idea could be a crossover with the 'Harry Potter' universe. Joseph Joestar could be a wizard from a far - off land who comes to Hogwarts. He might use his Hamon abilities in a way that is mistaken for some new form of magic. Another could be a crossover with 'My Hero Academia'. Joseph could be a hero with his own unique quirk - like abilities based on Hamon.
First, decide which universe you want to crossover with. For example, if it's the 'Final Fantasy' universe, research both 'Joseph Joestar' and the world of 'Final Fantasy'. Then, think of a plot that ties them together. Maybe Joseph has to help the heroes of 'Final Fantasy' save their world using his Hamon abilities.
In fanfiction, young Joseph Joestar is often depicted as highly energetic. He's always ready to jump into action, whether it's facing off against an enemy or trying to impress a girl. His brashness is also a common trait. He may rush into things without fully thinking them through, but his quick thinking usually gets him out of trouble.
A common theme is the exploration of her character in different situations. For instance, she might be put in a leadership role during a battle. Another theme could be her romantic relationships, which can be quite interesting as it adds a new dynamic to the story.
One good place to find female Joseph Joestar fanfiction could be Archive of Our Own (AO3). There are many talented writers on that platform who create interesting stories featuring this character. Just search for 'female Joseph Joestar' on the site and you'll be presented with a variety of works.
One popular young Joseph Joestar fanfiction is 'Joseph's Adventures in Cairo'. It really captures his youthful exuberance and his unique charm. The author does a great job of portraying his relationships with other characters in the series as well.
One common theme is the exploration of power dynamics. Given Joseph's strong stand abilities and Alessi's unique powers, many fanfics play around with how they interact in terms of power. For example, who would overpower the other in different situations.
There are fan fictions that explore Joseph's early years in more depth. Maybe a story that focuses on his training with Caesar and how that relationship developed further. This could show his growth as a character from a young, brash fighter to a more strategic one.
Well, 'Joseph's Second Chance' is a notable one. It has a well-crafted story where the de-aged Joseph faces new challenges and grows in interesting ways. The author does a great job of maintaining the essence of the character while exploring this new age dynamic.