Since it's a fanfic, it might introduce new characters that are unique to this story. There could be a rival within the federal system who is jealous of Bella's new - found status with the badge. Or perhaps there's a mentor - like figure who has been in the federal service for a long time and helps Bella understand the ropes. Another possibility is that there are informants that Bella has to deal with. These informants could be from different backgrounds and have their own motives for helping or hindering Bella in her work with the badge.
I'm not sure specifically as I haven't read this particular fanfic. But generally, it might involve Bella having a federal badge and getting into various adventures or situations related to that. Maybe she uses the authority that comes with the badge to solve mysteries or face challenges in a fictional world.
Maybe there are corrupt officials within the same federal system who see Bella as a threat to their illegal operations. They would try to get rid of her or stop her from uncovering their misdeeds. These antagonists would use their own power and influence within the system to create obstacles for Bella.
It could be about Bella using her federal badge and gun to solve mysteries. Maybe she's part of a special agency and has to face various challenges.
It really depends on the specific fanfic. There could be her husband, who would be a central character as well. He might be the one that Bella is trying to be the perfect wife for. There could also be friends or family members. Maybe a nosy neighbor who adds some comedic relief or a mother - in - law who has high expectations of Bella. In some cases, there could be a rival character, someone who is jealous of Bella's relationship or her status as the perfect wife.
It could be her best friend. Her best friend might be the one who accidentally discovers Bella's secret in the fanfiction. And then they have to deal with the situation together, whether it's keeping the secret or helping Bella face whatever the secret entails.
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.
There could be a kind teacher who tries to help Bella. This teacher might notice that something is wrong in Bella's life and tries to offer support, like giving her extra food or a listening ear.
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.
Bella's best friend could play a crucial role. They could be the one who stays by her side throughout the process, providing emotional support, bringing her things she needs in the hospital, and even arguing with the hospital staff if they think Bella isn't getting the best care.