The JJBA manga is indeed finished. It had a great journey and wrapped up with a satisfying conclusion for fans. However, there's always the possibility of spin-offs or related works in the future.
One common theme is friendship development. They often start from being acquaintances or even having some misunderstandings, and then gradually become closer friends. Another theme is mutual support. They help each other out in various situations, whether it's dealing with personal problems or facing challenges together.
One popular jirou x tooru fanfiction is 'A Meeting of Minds' which focuses on their unique bond and how they support each other through different challenges in their fictional world. It's really well - written with great character development.
One of the descendants could be Giorno. Giorno has his Golden Experience Stand and is quite different from Jonathan in many ways. He's part of the new generation of the Joestar family. Also, Josuke could be among those he meets. Josuke is known for his Crazy Diamond Stand and his strong sense of justice, which he may have inherited in part from Jonathan.
Another type could be about tg people in the workplace. They might have to deal with misunderstandings from colleagues at the start. But as time goes by, they prove themselves...
In fanfic, Harry Potter might use his knowledge of magic, like the Mandrake Restorative Draught. He could work with Hermione to research and find the cure faster, just as they...