Well, Lincoln could be involved if we consider the earlier storylines. He might offer some form of protection or support. And of course, the other members of the clans in 'The 100' would also play a role. They could either be a threat or a source of help. For example, the Grounders might have their own views on Octavia's pregnancy and how it could affect the balance of power in their world.
Indra might be a character in this fanfiction. Given her leadership role among the Grounders, she could have an influence on Octavia's situation. Also, Raven could be involved. With her technical skills, she might help in creating a safe environment for Octavia and the baby. Additionally, any new characters introduced in the fanfiction could also be related to Octavia's pregnancy, such as a mysterious healer or a potential enemy who wants to harm the unborn child.
Obviously, Octavia herself is the central character. Her brother Bellamy is likely to be involved. He would probably be very protective of her and the unborn child. Clarke might also be part of the story, perhaps providing medical knowledge or just being a friend to Octavia during this time.
Well, obviously Juvia herself is the central character. Her partner would also be very involved. If it's in the context of Fairy Tail, Gray would likely be her partner in the fanfiction, as they have a strong relationship in the original series. Then there are their friends like Lucy, Natsu, and Erza. They would probably be there to support Juvia during her pregnancy, offer advice, or just be there for the big moments.
Her colleagues at her firm like Abby, Huck, and Quinn are likely to be involved. They could be her support system, helping her with her work while she's dealing with the pregnancy. Or they could get caught up in the drama that her pregnancy might bring, like having to cover for her more often or deal with the media frenzy that might occur if the pregnancy becomes public.
Obviously Jules herself is the central character. Her partner, if she has one in the Flashpoint story, would be very involved. They would be there for her during doctor visits, shopping for baby things, and all the emotional moments.
Obviously Lana herself is the central character. Her Pokemon partners are very likely to be involved. For example, Popplio might be constantly by her side, providing emotional support. Ash and his Pikachu could also be part of the story. Ash, being a good friend, would probably offer his help and advice. Misty might also be there, sharing her own experiences or just being a good friend to Lana during this time. Brock could be involved too, perhaps using his knowledge of Pokemon and nature to ensure Lana has a healthy pregnancy. And other trainers from the Pokemon world who are friends with Lana might make appearances to show their support and be part of the story.
Also, any friends that Renesmee has made throughout her life could be involved. They might be there to offer moral support, or there could be some who are jealous or envious of her situation, which could add some drama to the fanfic.
Another character that could be involved is Charlie, Bella's father. His reaction to his daughter being pregnant in the strange world of Eclipse could be a significant part of the story. He might be confused, worried, or try to protect Bella in his own way. Also, some of the werewolf pack members aside from Jacob could also make appearances and contribute to the story based on their relationships with the vampires and Bella.
Obviously Lauren herself is the central character. Her family members like her parents would likely be involved. They might have different reactions, with her mother being more nurturing and her father perhaps being more concerned about the family's reputation.
Well, obviously Bella herself. Then there could be the father of the baby, if it's not a mystery. There might also be her friends or family members. They could play different roles, like being supportive or having doubts about the situation. And perhaps there are some medical characters, like a doctor or a healer if it's in a more fantasy - based setting, who are involved in taking care of her during the pregnancy.
The Lone Wanderer is likely to be involved. They have a pre - existing relationship with Amata from the game. Her father, the Overseer, might also play a role, either in supporting or opposing the situation. Other characters from Megaton or Tenpenny Tower could potentially be involved as well.
Finn could be involved if the fanfiction wants to explore a relationship with him as the possible father. He was an important part of Rachel's life in the original series, and his reaction to the news would be significant.