I'm not sure specifically which 'durga mati real story' you are referring to. There could be many stories related to someone named Durga Mati. It could be a personal story, a cultural or religious story. Without more context, it's difficult to provide the exact story.
There's no way to really tell if it's common specifically for someone named Jojo. However, in general, reading fanfiction is a popular activity among fans of many different franchises. The Jojo series has a large and dedicated fan base, so it's likely that there are fans named Jojo who partake in reading fanfiction, but we can't say for sure how common it is without more data.
Perhaps this Jojo is interested in exploring different interpretations and stories within the Jojo universe that fans have come up with. Fanfiction often takes the existing characters, settings, etc. from the original Jojo series and creates new and unique storylines. So, this Jojo might be a big fan of the series and wants to see what other fans have imagined.
If the Durga Mati story is related to a cultural or religious context, it could hold significance in terms of teaching moral lessons, or being part of the heritage of a particular group. For example, if Durga has religious connotations, the story of Durga Mati might be about living a pious life or following certain religious teachings. However, without the actual story, this is just conjecture.
It depends. Maybe there are some telltale signs or elements that suggest it's a JoJo reference fanfic, but without specific context, it's hard to say for sure.
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.