One interesting 'jojo fan fiction' could be a story where characters from different JoJo parts team up in a new adventure. For example, Jonathan Joestar and Giorno Giovanna working together to take on a new enemy that has powers from both their eras. It would be fascinating to see how their different fighting styles and personalities interact.
The idea of living in a society where the Nazi ideology was dominant is based on truth. In 'Jojo Rabbit', the way the characters interact with this ideology, like Jojo's initial admiration for Hitler, reflects the real impact of Nazi propaganda on the youth. Also, the hardships and fear that people faced under the Nazi regime are elements drawn from true stories. For instance, the way families were torn apart and the general sense of uncertainty were real situations.
The JoJo manga is mainly in black and white. Colored versions exist but are not the norm. Sometimes, colored illustrations are done for promotional purposes or by fans.
I think it's great. The characters are memorable, the plot is full of twists and turns, and the battles are epic. It's a manga that stands out from the crowd.
It depends on personal preferences. Some consider Jojo to be peak fiction for its unique style and engaging storylines. Others may have different opinions.