The narrator of a novel could be the protagonist of the story, a third party, or a voice-over. In most cases, the narrators were the protagonists of the story because this allowed the readers to be more involved in the plot and better understand the characters and events in the story. However, sometimes there might be a third party or a voice-over to narrate the story. This would make the story more objective and comprehensive, allowing the readers to better understand the background and truth of the entire incident.
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.
A distinct voice is crucial. For example, if a narrator has a very deep or very high - pitched voice that stands out, like Morgan Freeman's voice which is deep and commanding, it can make the story more memorable. And if they can use their voice to create different emotions, like excitement or sadness, it helps children get more into the story.
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.
Maybe it's a third-person narrator giving an objective account of the events. But we'd need to analyze the text closely to determine exactly who it is.