She might be more confident. Since she's Marcus's daughter, she could have a sense of entitlement and power that the normal Bella lacks. For example, she might not be as shy around vampires as she was in the original story.
In a 'bella as marcus's daughter fanfic', the plot could revolve around Bella getting involved in the vampire politics because of her relation to Marcus. The other vampire clans might see her as a threat or an asset. She would then have to navigate this dangerous world of power struggles and alliances. At the same time, she could be falling in love with a human or a vampire from a different clan, adding a romantic subplot to the story.
Another possibility is that a mysterious figure from the past comes back into Marcus's life. This person knows the secret and decides to reveal it to Marcus, leading to the discovery that he is Bella's father. For example, an old friend or a family servant who has been keeping the secret for years.
She would likely become more confident. Knowing she is the daughter of Hades, a powerful god, would give her a sense of self - worth that she might not have had before. For example, instead of being the damsel in distress in her relationship with Edward, she could be an equal partner, using her powers to protect him and his family if needed.
First, you need to establish their relationship before the pregnancy. Are they in a loving relationship? Or is it a more complicated situation? Then, describe how they find out about the pregnancy. It could be a simple home test or a visit to the doctor. After that, focus on their reactions and how it changes their lives.
Marcus may also face challenges from society. People might gossip or be judgmental about the situation. For instance, if Marcus has a certain reputation in the community, this new revelation could affect how others view him.
Bella might become more rebellious at first. The idea of being forced into a marriage goes against her independent spirit. So she could start to act out, be more outspoken, and challenge the authority that is forcing her into this situation.
Bella might start as a typical Malfoy, proud and a bit haughty. But as she interacts with Harry, she could start to see the world from a different perspective. For instance, she may notice how Harry values friendship and loyalty over blood status. This could make her more empathetic towards others outside of the pure - blood circle.
If Bella joins the army, her character could develop a stronger sense of purpose. She's no longer just the girl in a relationship with Jasper. She has a mission and a cause. This could make her more assertive and less passive in her relationship with Jasper. She might also develop a sense of camaraderie with her fellow soldiers that she didn't have before. This new social aspect could influence how she interacts with Jasper, as she now has a different set of relationships to balance. In the military, she would be exposed to different cultures and ways of thinking, which could make her more open - minded and adaptable, qualities that would impact her relationship with Jasper as well.
Bella may become a more adventurous character. Maybe she decides to try new things that she was always too afraid to do before because Edward was so overprotective. She could start going to parties, trying extreme sports, or exploring new hobbies. This new adventurous side of her would make her a more well - rounded character, and when Edward returns, he would see a completely different Bella.
She would be more hardened. In the Twilight world, she was mainly dealing with the supernatural in a relatively civilized setting. In Z Nation, she'd have to be tougher to survive the zombie - filled chaos. So she might be less naive and more street - smart.