In certain fanfictions, Edward's discovery of Bella's death could be the catalyst for him to become a more empathetic and understanding character. He realizes the pain of loss deeply and this could change how he treats others in the future. He might start to see the value in human life more than before, having lost the most important human in his life.
It often starts with attraction. Edward is drawn to Bella's unique scent and her differentness. Bella, on the other hand, is intrigued by Edward's mysterious nature.
Bella's character might become more confident. Without Edward, she has to rely on herself, which forces her to grow. As a vampire, she'll be more physically capable, and this could translate into mental strength as well.
Naruto becomes more determined. With Jiraiya's death, he realizes that he has to grow up faster and become stronger. So, his focus on training intensifies, and he's more eager to master new techniques.
Their relationship develops as Edward imparts his knowledge to Bella. Since he's her master, he has a certain authority. But as time passes, Bella might start to question some of his decisions, which adds tension and also deepens their relationship as they work through these issues.
At first, it might be a bit rocky. Since the marriage is by treaty, they may be a bit wary of each other. But as they start spending time together, they could begin to discover common interests. For instance, they might both be interested in a particular type of literature or music, which helps to break the ice.
His character could become more distrustful. If the cupboard held something that violated school rules or was potentially dangerous, he would be more vigilant towards students and staff alike.
His character might become more confident. Finding a dragon gives him a powerful asset, so he would likely stand taller and be more assertive.
Bella often becomes more confident in her relationship with Edward as his wife. She may be more assertive in making decisions for their future together.
After reuniting with the Cullens in fanfiction, Bella might become more confident. She has been through a lot on her own and now, being back with the Cullens, she has a support system again. This could make her bolder in her actions and decisions.
Often, it develops as they face external threats. Enemies from other vampire covens may target Bella because of her connection to Edward. As they fight off these threats side by side, their love and trust for each other grow. In many fanfictions, there are also emotional challenges. For instance, if Bella starts to feel suffocated by Edward's over - protection, they have to work through their issues, which ultimately strengthens their relationship.