It might be the unique plot. Maybe it takes the RWBY characters and puts them in situations that are different from the original series but still in - line with the overall RWBY universe.
I'm not sure of specific fanfics similar to it off the top of my head. But you could try searching on RWBY - dedicated fanfic websites like Archive of Our Own. There are likely to be fanfics with similar themes or tones.
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.
The insect bites in the lap of the king in the story might represent a disruption of the king's perceived invincibility. Kings are often seen as powerful and above common troubles. However, these insect bites show that he is still part of the natural world and subject to its whims. It could also be a way to humanize the king, making him more relatable to the readers or listeners of the story. If the story is about power dynamics, the bites could be the starting point of a change in how the king exercises his power, either because he realizes his own vulnerability or because his courtiers react differently to a king who is dealing with such a common and pesky problem.
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.
The red spots that appeared after being bitten by a dog were usually caused by bleeding from the ruptured capillaries under the skin. It usually took 3-7 days to completely subside. If there is no obvious skin damage or bleeding, but only red spots, you can wash the wound with soap and water and disinfect it with povidone. If you are worried about getting rabies, you can go to the hospital to get a rabies vaccine within 24 hours. Rabies was a serious disease with a high fatality rate, so a timely vaccine could prevent infection. If the wound has obvious skin damage or bleeding, you must go to the hospital to get a rabies vaccine after disinfection to prevent rabies from breaking out.
I'm not sure specifically as I haven't read it. It could be a story about love that has some sort of 'biting' element in a metaphorical sense, like a passionate or intense love.
A'man bites dog' story refers to a concept where the unexpected occurs. The phrase has become a sort of shorthand in media and communication. It implies that the typical or expected order of things has been reversed. We are used to hearing about dogs being aggressive towards humans, but when a man bites a dog, it's so strange that it stands out. It's like a disruption of the normal state of affairs, and such stories often get more attention precisely because they are so different from what we usually encounter.
There was a woman who found a spider in her bed. She didn't think much of it at first and tried to shoo it away. But it bit her on her hand. The bite was from a black widow spider. Immediately, she felt a sharp pain. Her hand became numb, and then she started having muscle cramps all over her body. She was rushed to the hospital in a lot of pain and fearing for her life.