I'm not sure as I haven't read that specific fanfiction. But generally in a fanfiction, Bella being the daughter of Trigntins would likely mean she has a special role within the story's universe created by the fanfic writer.
Yes, there are many. You can start by looking on fanfiction websites. Some might focus on their relationships, like friendship or family - like dynamics in different story settings.
In 'alice and bella fanfic', Alice is often depicted as very perceptive. She can foresee things, which gives her an edge in guiding Bella. Bella, on the other hand, is usually seen as brave. For example, in many fanfics, when they face danger together, Bella doesn't shy away. She stands her ground.
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.
They could start by sharing their dreams and fears. For example, Bella could tell Hunter about her insecurities in the cheerleading world, and Hunter could open up about his pressure in football. This would create a deeper emotional connection. Another way is through joint adventures like going on a road trip for a football game in another town and facing various challenges together on the way.
There could be a female character, Sofia, who is another member of the mafia. She sees Bella as a threat at first, thinking she'll steal her position or the attention of the men in the mafia. But as time goes on, they might form an unlikely alliance. There may also be a young and ambitious mafia underling named Antonio, who is always looking for ways to climb the ranks and his actions often impact Bella's situation in the story.
She could meet soldiers coming back from World War I. These soldiers would have their own stories of war and survival, and Bella might be drawn into their tales.