One possible plot could be that the black hair tie is a memento from a special person. Maybe it was given to Alison by an old friend who has since moved away. The story could revolve around Alison's memories associated with this person and how she embarks on a journey to reunite with them, with the hair tie serving as a constant reminder and a source of motivation.
It could be a symbol of love. Maybe it was from a romantic interest and every time she looks at it, she is reminded of their shared moments. For example, if it was a gift from a first love, it would carry all the emotions of that relationship like the butterflies in the stomach, the first kiss etc.
Perhaps in the fanfiction, the black hair tie on Jade's wrist is a clue to her past. She has amnesia and the hair tie is the only thing she has from her previous life. As she begins to investigate, she meets various characters who either try to help or hinder her in uncovering the secrets associated with the hair tie.
Perhaps the black hair tie is a reminder of a past love. Felicity is constantly haunted by the memories associated with it. She meets someone new in the fanfiction, and the presence of the hair tie creates a conflict as she tries to move on from her past while still holding onto this memento.
In hair fanfiction, a black hair tie on the wrist can symbolize a connection to a particular character. It might be something that the character left behind or a memento. For example, if it was from a love interest, it could represent an unspoken bond or a longing for that person.
A fanfiction could revolve around a mom with a black hair tie on her wrist who is a superhero in disguise. The hair tie is actually a magical object that gives her powers when she ties her hair back. She has to keep it a secret from her family while still saving the day in the neighborhood.
In fanfiction, a black hair tie on the wrist could symbolize a connection to a particular character. Maybe it was given by a love interest, and the character wears it as a reminder of that person. It could also be a sign of a secret society or group within the fanfiction world, where the black hair tie is a form of identification.
The black hair tie on Rachel's wrist might be a symbol in a fanfiction. It could represent her connection to a secret society. Only those who notice the hair tie are part of the group, and throughout the story, Rachel has to keep it hidden from those who would oppose the society.
The black hair tie on the wrist can be a part of a character's transformation. Suppose a shy character decides to take off the hair tie from their wrist and tie their hair up, signifying a newfound confidence and a change in their attitude towards a situation in the fanfiction.
The fact that her hair is in a bun might also play a role. It could be a cultural or traditional style in the fictional world she belongs to. When she's kidnapped, her captors might be disrespectful of this style, which angers her and gives her the motivation to resist. The bun could also be used practically during her captivity. For example, she might hide small objects in it to help her escape, like a lock pick or a small note.