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.
Well, to reset time stories, you could think about introducing a magical or technological device that has the power to rewind or reset time. Another option is to have a character with special abilities that can manipulate the flow of time. However, you need to be careful with the logic and consistency to make it believable.
First, power off the Pandigital Novel 7 completely. Then, hold down a specific combination of buttons (which could vary depending on the model) to initiate the reset process. Check the user manual for exact details.
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.
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.