Tanya and Bella might be characters from a popular book or movie series that the author of the fanfiction really likes. For instance, they could be from a vampire - related series, where the actions like handcuffing could be related to the power dynamics or the complex relationships within that world. They could also be from a mystery or thriller - type of story, where this act is part of a larger mystery or plot twist.
There is also a possibility that a lone vampire, who has a sense of justice or who has been secretly observing Bella and has grown fond of her, decides to take on the Volturi and rescue her. This vampire could have some special abilities or knowledge that gives them an edge against the powerful Volturi.
One common theme is friendship. Their relationship often starts as a friendship that then develops into something more. They support each other through school and sports, which is a big part of the fanfiction.
She might have long, flowing golden hair like the sun, a symbol of her divine heritage from Zeus. Her eyes could be a bright, electric blue, reminiscent of Zeus' lightning. And she would probably have a tall and graceful stature, with a presence that commands attention.
She might be more assertive. Since she is related to Klaus, she may inherit some of his confidence. So instead of being the meek Bella we know from the original, she could be more outspoken and take charge of situations.
Well, perhaps she's scared because she doesn't fully understand what it means to be Sam's mate. There could be some sort of mystery or unknown elements associated with this bond. It might also be that she's afraid of the potential danger that Sam's world or position might bring into her life. For example, if Sam has enemies, she could be worried about being targeted.
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.
Edward is often still a key character. If Bella is not human, their relationship dynamic would change drastically. For example, if Bella is a vampire, they might have different power levels or views on being a vampire, which could create conflict or a new kind of bond. Another character could be Jacob. If Bella is some sort of magical being, Jacob's werewolf nature might interact with her in unexpected ways, like an alliance or a rivalry.
There's also a possibility that some of the more morally grey characters in Gotham, like Catwoman, could be Bella's allies. Catwoman has her own code of ethics, and she might relate to Bella's struggle between good and evil. They could work together in certain situations, especially if there are mutual benefits involved.