Another possible main character could be the base commander. Let's say Commander Smith, who notices Bella's potential and gives her special tasks or opportunities, which then drives the story forward as Bella has to prove herself worthy of these tasks.
There could be her drill sergeant, a tough but fair person who helps shape Bella into a proper navy personnel.
A doctor named Dr. Smith could be a main character. He could be a strict but fair physician who at first doubts Bella's abilities but later comes to respect her.
Her parents might be important characters. They could either be supportive of her career choice or initially be against it, thinking it's too difficult. Also, there could be a senior lawyer at the firm where she interns, who takes her under his or her wing and guides her through the complex world of law.
A gruff but kind - hearted ranch hand named Jake could be a main character. He's been on the ranch for years and knows all its secrets. He initially sees Bella as an outsider but gradually warms up to her and becomes her mentor in ranch - related things.
There could be a dance instructor. Maybe someone who notices Bella's potential even though she's trying to keep her dancing a secret. This instructor could play a key role in her journey as a dancer.
There could be Edward. Even if Bella is now immortal, Edward might still play a significant role. He could be either her eternal love or her adversary depending on how the fanfiction is written. Another character could be Alice. Since Alice has her own special abilities, she might be there to help Bella navigate the new world of immortality. For example, she could foresee some of the challenges that Bella will face. Also, Jacob might be a main character. His relationship with Bella, whether it's a friendship or something more complicated, could be further explored in the context of Bella's immortality.
There could be Edward. Maybe he is involved in Bella's life with her psychic powers. He might be curious about her abilities or even try to protect her from the consequences of using those powers.
Maybe Bella has some personal growth. She could start as a timid person and the army experience makes her brave. For example, she overcomes her fear of heights during a training exercise.
Her best friend could be a main character. This friend could be the one who has always been there for Bella, through all the hardships of her past. They might try to protect Bella from the things that are resurfacing from her past, or they could be the one pushing her to face her past head - on. For example, the friend might find out some new information about Bella's past and decide that it's time for Bella to know the truth, even if it's painful.
If it's a more modern - day or non - supernatural setting, Bella's parents could be main characters. They might be overjoyed at the birth of their grandchildren and be actively involved in their upbringing. They could provide financial support or just be there for emotional support for Bella, especially during the tough early days of raising twins.