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.
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.
As a fan of web novels, I don't know if a max level 70 and Supreme 10 are worthy of pride in web novels. This depended on the individual's values and cultural background, as well as the role of this setting in the story.
Generally speaking, the max level and supreme level in novels were the heights that the characters reached in the game. It might represent their skills, equipment, experience, and so on. If this character reached these heights, then they might feel proud and proud. However, this did not necessarily mean that they would be proud because everyone's values and feelings were different.
If you wanted to know if the max level 70 and Supreme 10 were worthy of pride in online novels, you would have to analyze it based on the specific storyline and character settings.
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.