It's hard to pinpoint a single 'strongest stand' in Jojo manga. Different stands have unique abilities and advantages. For example, The World has the power to stop time, which gives it a significant edge in many situations.
Yes, they can. Many business profiles on various platforms have the option to share stories to engage with their audience and showcase their activities.
I don't have a definite answer for you. Sometimes the three profiles could be related to different perspectives, stages of the story, or even different themes. It all depends on how they're used and presented.
Start by imagining the character's background, personality traits, and goals. Also think about their appearance and any quirks or habits. That'll give you a good foundation.
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.