Jacob and the werewolves would likely be on high alert. They might see Bella as a changed enemy now. There could be more tension between the vampires and werewolves in the area. Also, other vampires in the area who were perhaps neutral before might start to take sides, either for or against Bella, depending on how they view James' actions and Bella's new vampire status.
For Edward, it could be a huge shock and a source of internal conflict. He might struggle with his feelings for Bella as a vampire, different from the human Bella he fell in love with. The Cullen family might be divided in their opinions. Some might be worried about Bella's ability to control her new vampire instincts, while others might be more accepting.
In some fanfictions, James might justify it by saying he sees great potential in Bella as a vampire. He could claim that her beauty and tenacity would be enhanced, and that she would have eternal life to experience the world in a way she never could as a human. Also, he might say that she was already on the fringes of the vampire world because of her relationship with Edward, so becoming a vampire was just the next step.
Well, one consequence could be that she has to distance herself from her human friends. Since she's now a vampire, she might be afraid of accidentally harming them. For example, her scent might be too alluring to them, and she could lose control. Also, her family relationships would change. Her father, for instance, would be left in the dark about her true nature, and she'd have to keep lying to him, which would create a strain on their relationship.
I'm sure there are. The Twilight saga has a huge fan base, and fanfiction writers love to play with different scenarios. Bella's character is central to the story, and her relationship with vampirism is a key aspect. A story where she turns into a vampire as a result of suicide could be a way to explore deeper emotions, different character arcs, and new relationships within the Twilight universe. However, such a topic can also be quite dark and might be treated with different levels of sensitivity in different fanfictions.
Obviously, Edward is a key character. He is not only Bella's love interest but also someone who has a lot of knowledge about the vampire life. He can help Bella understand her new powers and limitations. Alice is also popular in these fanfictions. With her ability to see the future, she can foresee any potential problems or challenges that Bella might face as a vampire. And then there's Rosalie. Her initial dislike for Bella might change or intensify after Bella turns, adding more drama to the story.
The consequences could be complex. On one hand, they might grow closer as they face the challenges of Elena's new existence. But on the other hand, Elena might struggle with her new identity and blame Stefan for turning her. This could create tension and strain in their relationship.
One interesting plot could be Bella's struggle to control her new vampire instincts. For example, she might have a hard time dealing with her sudden urge for blood while trying to maintain her relationships with her human friends and family. Another plot could be her discovery of new vampire powers that are unique to her. Maybe she can do something no other vampire can, like communicate with animals on a deeper level.
One consequence could be that she has to deal with new relationships. Her human friends might be scared of her, and she has to learn to interact with them in a new way. Also, she may face challenges within the vampire community. Some vampires might not accept her easily because she was once human.
The main characters Damon and Bella will interact with each other on multiple levels. Damon will probably teach Bella about the vampire way of life. There could be other vampires from different clans that cross their path. These vampires might be curious about Bella or have their own agendas. Additionally, if the fanfiction has a touch of the supernatural world at large, angels or demons (if they exist in that universe) could also interact with them, adding a whole new layer of complexity to the story.
In many such fanfictions, a key plot point could be the internal struggle Carlisle faces. He is a moral vampire, so turning Bella goes against his principles at first. He might worry about how Bella will adapt to the vampire life, with its bloodlust and the need to hide from humans. Another plot point could be Bella's reaction. She may be initially excited at the prospect of immortality and being with Edward forever, but then realizes the sacrifices she has to make, like leaving her human family behind.
Well, it could start with Jasper's reasons for turning Bella. Maybe he sees a potential in her that no one else does. After the transformation, Bella might go through a phase of self - discovery. She could be exploring the new world of vampires, learning about their history and culture. And there would be the inevitable love triangle or quadrangle situation. With her new vampire allure, she might attract other vampires, causing some jealousy or competition among them, especially if Edward is still in the picture.