Perhaps a fanfiction where female Dio has a change of heart. She decides to turn away from her evil ways, and Jotaro, being the perceptive one, senses this change. They then start a relationship that is full of challenges as they face opposition from both sides - Jotaro's friends who don't trust Dio, and Dio's former allies who see her as a traitor.
A time - travel themed fanfiction could be interesting. Female Dio travels back in time to before Jotaro's birth. She ends up influencing events in a way that changes Jotaro's life when he is born. As he grows up, he is constantly haunted by visions of this strange woman, and when they finally meet, there is an instant connection and a whole lot of mystery to unravel.
One idea could be a story where they meet in an alternate universe where Dio is a female. Jotaro is initially suspicious but then finds himself intrigued by her charisma. They could be forced to team up against a common enemy, and during their journey, they start to understand each other better.
It can start with conflict. Since Jotaro is a hero and Dio is usually a villain, there could be intense battles between them at first. But then, as they learn more about each other, they might find common ground. For example, they could both be seeking a certain power or knowledge.
One idea could be that Dio and Aya are forced to team up to escape the horrors of the mad father's mansion. They start off distrusting each other but gradually learn to rely on one another.
One possible plot could be that Kakyoin and Jotaro come across a mysterious horse in their adventures. This horse has some special abilities related to the 'Stand' powers in 'JoJo's Bizarre Adventure'. They then have to figure out how to handle this horse and how it might be related to their mission.
One interesting fanfiction could be about Jotaro and Star Platinum having to face a new, extremely powerful Stand user in a different dimension. It might explore how their bond grows even stronger during this difficult encounter.
One idea could be a story where a human trainer forms a deep bond with a female Pikachu. They go on adventures together, facing challenges that test their relationship. The Pikachu might have unique abilities that help the human in battles.
One common theme is friendship. They might explore how their relationship could develop in different ways compared to the original male - male dynamic in the series. Another theme could be adventure, with them going on new quests together.
There might be a fanfic where the female Dio forms an unexpected alliance with a Joestar. This could be a really cool concept as it goes against the traditional enmity. They could team up to face a greater threat in the jojo universe, and during this time, the female Dio's character could be developed further, showing her complex personality.
The contrast between their personalities. Jotaro is the cool and stoic type, while Josuke is more hot - headed and energetic. This creates an interesting dynamic in fanfictions. Their shared connection within the JoJo universe also adds to the appeal. Writers can explore their relationship in different ways, whether it's a friendship that develops into something more or a deep bond from the start.
One idea could be exploring a different origin story for the mech. Maybe it was created by an ancient civilization rather than just being a modern invention. Another idea is to have the characters face a new type of enemy that has powers they've never encountered before, like an enemy that can manipulate time. And a third idea could be a 'what if' scenario where the main character didn't become the mech pilot and someone else had to step up.
One idea could be to cross X - 23 with the X - Men. Maybe she teams up with Wolverine to face a new and powerful enemy. They could use their similar powers in unique ways to combat threats.