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.
Their relationship would likely become more deep and committed. Having a baby together means they are now a family, and they would have to rely on each other more than ever.
She may start to develop deeper relationships with other characters. For example, her bond with Brittany could become even stronger as Brittany stands by her side during this difficult time. Also, she might become more empathetic towards others in the Glee club who have their own secrets or insecurities. Her character growth could also involve her becoming more involved in the Glee club's activities in a more positive way, using her voice to sing about her experiences and feelings.
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.
Fanfictions on this topic often take a deep look at Santana's character. They may show her journey of realizing she has an eating disorder, perhaps through small signs like skipping meals or being overly critical of her appearance. It could also show her getting help, either from friends or professional sources, and the process of recovery which can be both difficult and inspiring.
In a fanfiction, Rachel and Santana could become friends after being paired for a project that has nothing to do with glee club. Maybe they have to work on a community service project. At first, they bicker constantly, but as they face challenges like dealing with difficult people in the community or coming up with creative solutions to problems, they start to respect each other. This newfound respect turns into a real friendship that surprises everyone around them.
I'm not entirely sure specifically about 'santana pregnant fanfiction'. However, many fanfiction communities are vast. It could depend on the fandom Santana is from. If it's a popular one, there's a good chance someone has written a story with that concept. You could also check related fan forums where fans might discuss or share such fanfictions.
Another possibility is that there's some confusion at first. Maybe a false positive pregnancy test leads to a rollercoaster of emotions for them. They could start planning for a baby only to find out later it was a mistake, but this experience could bring them closer as a couple.
One great Santana OC fanfic is 'The New Arrival'. It beautifully weaves in a new original character that has a complex relationship with Santana. The character development in this fic is really well - done.