It could be developed further by creating interactions between Bella and Petrova. Maybe Bella tries to meet Petrova, or they start a friendship. Their conversations could reveal more about both characters and drive the story forward. Also, introducing other characters who react to Bella's fandom of Petrova could add more drama and plot twists.
One way is to explore the backstory of Petrova more deeply. If Bella is a fan, then showing what makes Petrova so fascinating to her through detailed backstories would be great.
It could mean that in this fanfiction, Bella Swan has an admiration or is a fan of Petrova. Maybe it explores how Bella's character is influenced by Petrova in this fictional scenario.
To develop Bella in this fanfiction, she could be given a mentor. Maybe an old witch who has been watching over her. With the mentor's help, she can learn about the history of doppelgangers in the witch world and how to control her powers. She can also struggle with the morality of using her powers, like whether she should use them to get revenge on those who have wronged her in the past.
Simon's character can be developed by exploring his backstory. If he has a troubled past, it can be revealed gradually as he gets closer to Bella. Also, his relationship with Bella can make him more empathetic or more guarded depending on how their interactions play out. For example, if Bella is initially suspicious of him, he might become more defensive in his behavior.
One way to develop Bella is to explore her new identity as Carlisle's wife. She could struggle with the expectations that come with it, both from the Cullen family and from the vampire world at large. This internal conflict would add depth to her character. For Carlisle, you could delve into his feelings of protecting Bella in a new way now that they are married. He might become overprotective or have to learn to trust her more as she grows in her new role. Additionally, their relationship could be shown to evolve as they face new challenges together, which would in turn develop both characters.
Bella Swan's character could be developed by having her explore different aspects of herself. In the context of Greek gods, she might discover a more passionate side of herself, like the passion associated with the Greek concept of eros. This could make her more confident and change her relationships. She could also be developed through her experiences with the Greek gods' powers. If she gets a taste of Athena's wisdom, she could use it to solve problems in Forks that she couldn't before. This would make her a more respected and important figure, not just among the Twilight characters but also among the Greek gods she encounters.
One way the story could be developed is by having Bella be a secret Mikaelson fan in the Twilight universe. Maybe she discovers a hidden book about the Mikaelsons in the Forks library. This could lead to her having strange dreams about them and it might even influence her relationship with Edward. For example, she could start comparing Edward's vampire nature to that of the Mikaelsons.
Their characters can be developed by exploring their pasts. For example, delving into Nikki's previous relationships and how they've shaped her view on love and commitment. For Artem, his journey as a dancer in different countries could be explored. This would add depth to their characters and make their relationship in the fanfiction more complex and interesting.
Their relationship can be developed through shared experiences. For example, they could face a common enemy together. This would force them to rely on each other and understand each other's strengths and weaknesses.
In fanfiction, their relationship might develop through a series of adventures. Suppose they go on a quest to find a rare artifact that has the power to either save or destroy the vampire world. Along the way, they face numerous challenges like dangerous terrains and other powerful vampires. During these hardships, they start to care for each other more. Peter might show his protective side towards Bella, and Bella might be the one to give Peter hope and a new perspective on life. This would strengthen their bond.
Dialogue is also a key factor. Writers can create deep conversations between them. Alice could start a conversation about their futures, and how they all want to shape the vampire coven. Rosalie might open up about her insecurities regarding her beauty as a vampire, and Bella could comfort her, saying that it's not just about physical beauty. This would bring them closer emotionally.