If it's set in a particular community or group, there could be other characters like a wise old neighbor who gives her advice based on her own experiences. Also, if there's a love interest in the story, that person would play a significant role. Maybe a doctor or a midwife who takes care of Aria during her pregnancy could be another important character.
In a more complex story, there could be some antagonists. For example, someone who is jealous of Aria and tries to cause trouble during her pregnancy. Or perhaps a character from her past who resurfaces and creates drama. Her co - workers, if she has a job, could also be characters in the fanfiction, either being very understanding or causing some workplace - related issues due to her pregnancy.
Obviously, Aria herself is the main character. Her family members like her mother and father could be important characters, offering support or having different opinions. Her best friends would also be likely to be involved, providing emotional support or getting into some friendly arguments about how she should handle the pregnancy.
Well, there could be her best friend who is always there for her during the pregnancy, giving her advice and emotional support. There might also be a mysterious figure, like an old wise woman who has knowledge about pregnancies in special circumstances that Tera Faya's case might be. And of course, there could be a rival of some sort, who might try to use her pregnancy against her in some way.
Obviously, Elliot Stabler could be involved. He and Olivia have a long - standing relationship in the show, and he could be a source of support or conflict depending on the story. Fin Tutuola could also be there, as he's her colleague and friend, and might offer some comical or heartwarming moments as he tries to help her out. Captain Cragen could be in the story as well, dealing with how Olivia's pregnancy affects the work environment.
Ezra could be a likely candidate as they have a complex relationship in the original series. It would add more drama to their already tumultuous love story if he were the father.
Obviously, Miss Martian herself is the central character. Her friends and teammates from the superhero group she belongs to could also be involved. For example, Superboy might play a role as a friend or protector. He could be there to support her during difficult times or help keep her and the baby safe from any threats.
The father of the baby would be a key character. It could be a fellow ninja or someone from her past.
Well, Naruto himself could be involved. He might be concerned about Tsunade's pregnancy and offer his support in some way, like running errands for her or helping to keep the village in order while she's dealing with her pregnancy.
Igneel could also play a role. Since Igneel was Natsu's adoptive dragon father, he could appear in Natsu's mind during the transformation, guiding him and giving him advice on how to handle his new dragon powers. And there could be other dragons in the story as well. They might be either friendly or hostile towards Natsu depending on their nature.
There could also be new characters introduced. Maybe other magizoologists from different parts of the wizarding world. They could have different approaches and beliefs about magical creatures. Some might be rivals, trying to outdo Harry in the discovery and study of new species, while others could be mentors, guiding him in the complex world of magizoology.
Obviously Ranma herself. Her father Genma could also be a major character as he has to deal with his daughter's new permanent state. Akane could be there too, and their relationship would likely be very different. Instead of the typical boy - girl rivalry, it could turn into a more complex female - female dynamic.
The Avengers could be involved. Captain America, for instance, might be suspicious of this 'Loki' (who is actually Harry) and keep a close eye on him. Iron Man could use his technology to analyze Harry, thinking he is Loki. And from the Harry Potter universe, Ron could be there, trying to support Harry in this strange situation where he is mistaken for someone else entirely.