The Cullen family members are often main characters. Edward, with his brooding nature and ability to read minds, is likely to be involved. Bella might also be there as she is closely tied to the family. And Carlisle, being the patriarch, often plays a crucial role.
Bella and Edward are often main characters in such fanfiction. Since their relationship is central in the original Twilight series, in fanfiction about sacrifices, they could be the ones making sacrifices for each other. For example, Edward might sacrifice his vampiric nature to give Bella a more 'normal' life if she so desires.
Some fanfictions might also involve the villains. Voldemort or his Death Eaters could be interested in the bound collar for their own evil purposes. They might try to steal it or use it against Harry and his friends, which would create a lot of conflict and action in the story.
The Volturi leaders also frequently show up in these fanfictions. Aro, Caius, and Marcus. Their actions and decisions can be completely different in an alternate ending. They could be more benevolent or perhaps more devious. Their relationship with the Cullen family and Bella can take on new twists and turns.
Bella herself can also be part of these fanfictions in terms of how she reacts to the muscle growth of the male characters. Her perspective, whether it's admiration, fear, or something else, can add depth to the story. Also, sometimes in unique fanfictions, she might even have some form of power - related muscle growth herself.
Edward is often involved. Since he's so close to Twilight, he would be there to support her or sometimes be a source of conflict as he tries to help in his own way but might not always understand what she's going through. Bella's family, like Charlie, could also be main characters. Charlie might notice the changes in Twilight and try to figure out what's wrong. And then, her vampire friends like Alice could play a significant role. Alice might use her ability to foresee things related to Twilight's PTSD, either to help or sometimes make things more complicated.
Weiss Schnee is another character. Given her complex family situation with her overbearing father and the whole Schnee family legacy, fanfictions can delve into how she reconciles her family ties with her own goals and values in the world of RWBY. She might try to break free from her family's negative influence or find a way to redeem her family name.
Obviously, Tonks herself is a main character. She brings her unique Metamorphmagus abilities and her own personality into the Black family dynamic.
Twilight's friends like Pinkie Pie, Rainbow Dash, Rarity, Fluttershy, and Applejack can also be part of these fanfictions. They might be shown in flashbacks or回忆 related to Twilight's past, perhaps showing how they first met or how Twilight's view of them changed as she got to know them better over time.
Well, the main characters are usually the wolf pack members. In the Twilight context, that could include Sam Uley, who is often a leader - type figure in the pack. Jacob is also very likely to be involved as he has a major presence in the Twilight wolf pack storylines. As for the shared mate, it could be a human character, perhaps someone with a connection to the supernatural world in the Twilight universe. This character would be at the center of the complex relationships and story arcs involving the wolf pack's shared claim on them.
Obviously, Bella's daughter is the central character. Often, Edward Cullen, as the father, is also very involved. He can help guide their daughter in understanding her vampire side. Jacob Black might also be a significant character, perhaps having a protective or friendly relationship with Bella's daughter, similar to his relationship with Bella in the original series.