There could also be other secondary characters. Maybe Serene has a best friend who tries to support her through this difficult time after Darien leaves. Or perhaps Darien has a confidant who either encourages or tries to stop him from leaving Serene.
Perhaps Darien is pressured by external factors like his family or society. His family might not approve of Serene, or society's expectations are weighing him down. As a result, he makes the wrong choice of leaving Serene, who is now pregnant and has to face the situation alone.
Well, one possible plot could be Serena struggling to come to terms with being pregnant alone after Darien leaves. She might have to face the judgment of society and her own self - doubt. She could then decide to be strong for the baby and start building a new life for herself, proving that she doesn't need Darien to raise the child.
Well, the two main characters are Natsu and Lucy. Natsu's departure is the inciting incident. Lucy, now pregnant, has to face the world on her own. Her character will probably show a great deal of growth as she deals with single motherhood. While the story is mainly about them, other characters from their guild might also play important roles, such as providing support or causing additional conflict in relation to Lucy's situation.
Well, Harry Potter is obviously one of the main characters. The other main character is often an original female character who is pregnant. She could be a witch that Harry has fallen in love with or a Muggle who got caught up in the wizarding world through Harry.
Bella is surely a main character. Since she's pregnant, her journey of dealing with the pregnancy, her emotions, and her future plans are key. Jacob, despite leaving, will still be important as his departure sets the story in motion. There may also be other characters like Bella's family or friends from the Twilight series, such as Charlie or Alice. They could be involved in Bella's life during this time, providing support or causing additional drama.
Serena would likely become more independent. Since Darien has left her while she's pregnant, she has no choice but to rely on herself. She might become more assertive in making decisions for herself and her unborn child.
Obviously, Derek and Meredith are the main characters. But other characters from their world could also play important roles. For example, Meredith's friends or colleagues at the hospital might be there to support her through the pregnancy. They could offer advice, a shoulder to cry on, or practical help, which would also be an important part of the story.
Well, obviously Peter Parker and MJ are the main characters. But there could also be other characters like Aunt May who might play a role in the story. She could be the one to comfort MJ after Peter leaves or try to convince Peter to come back.
In this fanfiction, Bella and Jasper are the main focus. Bella, with her tenacity and her ability to adapt to the vampire world, and Jasper, with his unique powers and his own personality quirks. Their relationship is likely to be at the center of the story, as they leave whatever situation they are in and face new challenges together.
Obviously, the main characters are Tony and Pepper. Tony is a complex character, a genius inventor and superhero. Pepper is his love interest and also a very capable businesswoman who often has to deal with the consequences of Tony's actions.