Obviously, the Cullens would be the main characters. Carlisle, as the patriarch, would play a crucial role in raising Bella. Esme would be like a mother figure to her. Edward would also be important, his relationship with Bella evolving from something different than in the original story. And of course, Bella herself is a central character.
In some stories, Bella could be the key to uniting different vampire clans. Since she's adopted by the Cullens, she might be seen as a symbol of a new way of vampire - human coexistence. This could lead to other vampires either trying to use her or trying to protect her from those who want to use her for their own gain.
Some fanfictions might be part of a series. So, when you search, don't just limit yourself to stand - alone stories. Check out series that might have a plotline where the Cullens find baby Bella. Sometimes, the build - up and development in a series can be more in - depth and interesting compared to a single - shot fanfiction.
There might be a fanfiction where the Cullens find baby Bella during a hunt. At first, they're not sure what to do with her, but then they feel a strange connection. As she grows, she starts to show signs of being a key figure in the vampire - human relations in their area. Maybe she has some sort of power that even the Cullens don't fully understand at first.
Well, perhaps the little girl has some special power that the Cullens notice. So they decide to take her in to protect her from those who might misuse her power. For example, she could have the power to predict the future in a very unique way that even the Cullens find fascinating.
Well, in such a fanfiction, Harry might gain new powers from the Cullens. Since the Cullens are vampires with unique abilities in the Twilight universe, Harry could learn things like super - speed or enhanced senses. Maybe he'd also have to deal with the vampire lifestyle and the rules of their coven.
There could be a human character, perhaps a teacher or a neighbor who notices the strange situation with the Cullens and the little girl. This character could add some extra drama as they try to figure out what's really going on with this family that seems a bit different. They might suspect the Cullens are up to something not quite normal and start to investigate, creating more storylines.
She might start by giving them the silent treatment. Just ignoring them completely when they try to talk to her, which would be a very human way of showing anger.
Well, it could be due to the way the Cullens interact with the other people in Forks. If Bella notices that they are being manipulative or using their powers in a way that she doesn't like to influence the townspeople, that could make her start to hate them. Also, if there is some kind of power struggle within the Cullen family that starts to affect Bella negatively, like she gets caught in the middle of it or she sees how it's causing harm to those she cares about, she might turn against them.
It could be that the fanfiction writer took a different approach to the story. In some fanfictions, the Cullens could be involved in situations that go against what Bella stands for. Perhaps they are written to be more secretive and untrustworthy, leading to Bella's hatred.