The main character is always Bella in this type of fanfiction. However, new characters could be introduced as well. For instance, a blind mentor who has learned to live fully with blindness could be added. This character could guide Bella and help her accept her condition. Or there could be a villain who tries to take advantage of Bella's blindness, which would then lead to a conflict where Bella has to use her wits and other strengths to overcome the villain.
One great 'bella is bella is blind fanfiction' story could be one where Bella's blindness leads to her developing extraordinary other senses. She might be able to sense people's emotions more acutely, like she can tell when someone is lying just by the change in their voice or the way they move around her. Another could be a story where she discovers a new power within herself because of her blindness, perhaps a psychic ability that helps her in some way, like predicting danger.
Love in a different light is a big theme. Since Bella is blind, the way love is expressed and experienced between her and other characters, like Edward, is different. It's not just about physical attraction but more about emotional and mental connection. Also, the theme of vulnerability and protection. Bella is more vulnerable because of her blindness, and the other characters feel a stronger need to protect her.
Overcoming challenges is also a big theme. Being blind presents a lot of difficulties, and these fanfictions usually show how Bella bravely faces them. It could be something as simple as getting around in a new place or as complex as dealing with dangerous situations.
One possible plotline could be that Marcus discovers Bella's blindness and is initially hesitant about their relationship but then grows to see it as something that makes her unique and special. He might then become very protective of her.
At first, it might be a bit rocky. Bella, being human and now blind, is in a very vulnerable state. Caius, as a powerful vampire, may come off as intimidating. But as time goes on, they start to develop a deep bond. Caius learns to be more gentle and caring, and Bella starts to trust him more and more.
Well, Caius could be very possessive and see Bella's blindness as something that makes her even more his. He would be by her side all the time, guiding her physically when needed. He might also share his vampire senses with her in some way, like describing the world around them in vivid detail so that she can 'see' through his words. And he would definitely be very angry if anyone made fun of or took advantage of her blindness.
I'm sorry I don't have specific fanfiction stories to recommend directly. But you can try searching on popular fanfiction websites like Archive of Our Own or FanFiction.net. Use the key phrases 'bella is marcus mate and bella is blind' in the search bar, and you might find some interesting stories there.
One interesting Bella Swan blind fanfiction could be about her developing extraordinary senses other than sight to navigate the supernatural world she's in. For example, she might have an enhanced sense of smell that helps her detect the presence of vampires or werewolves from a distance.
Well, some 'Blind Bella Twilight Fanfiction' could be about the Cullens' reactions to Bella being blind. They might have different ways of trying to protect her or help her. Maybe Edward's ability to read minds becomes less useful in some situations, and he has to rely more on his other vampire senses to understand Bella's needs.