Well, it could be a simple fashion statement. Maybe Darcy just likes to have a hair tie handy in case she needs to quickly put her hair up, like if she's in the middle of some Avengers - related chaos and doesn't want her hair in her face. It could also be a gift from someone, perhaps a fellow Avenger or a friend, which would add a bit of sentiment to it.
The hair tie on Darcy's wrist might be a symbol of her practicality. In the world of the Avengers, things can get hectic fast. Having a hair tie at the ready shows that she's prepared for any situation. Also, it could potentially be used as a tool in a pinch. For example, if she needs to tie something small together quickly, the hair tie could come in handy. It gives her character an added layer of resourcefulness.
In Avengers fanfiction, the hair tie on Darcy's wrist could be a sign of her connection to normalcy. While she's surrounded by superheroes and extraordinary events, the hair tie is a very ordinary, everyday item. It could represent her holding onto her own identity and a sense of the regular world outside of the Avengers' craziness. It might also be a little quirk that makes her more relatable to the readers, as many people wear hair ties on their wrists for convenience.
One idea could be that Darcy, being an Avengers fan, always wears a hair tie on her wrist as a sort of good - luck charm. In the fanfiction, she could be an intern at Stark Industries and one day, while wearing that hair tie, she accidentally stumbles upon a secret project of the Avengers. Maybe it's a new type of weapon or a device that could potentially change the fate of the world. This discovery then thrusts her into the middle of an Avengers - related adventure where she has to use her wits and the 'lucky' hair tie (which could end up having some hidden significance) to help the Avengers save the day.
It might not seem like much, but the hair tie could be a conversation starter. Maybe one of the Avengers comments on it, and it leads to a more in - depth conversation, strengthening their bond. For example, Thor could be curious about this strange 'band' on her wrist, and Darcy's explanation could make him see her in a new light.
It could be a symbol of a prophecy. In the fanfiction world, there could be an ancient prophecy that mentions a 'band of power on the wrist of a true believer'. Darcy, being an Avengers fan, is the true believer. When the Avengers face a seemingly unbeatable enemy, they start to notice that Darcy's hair tie on her wrist has some strange powers. It glows when danger is near or gives off a force field. This makes the hair tie a central plot device as they figure out how to use its powers to defeat the enemy.
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.
It could be a symbol of a particular phase in their life. Maybe when they were younger and more carefree, and now at 40, it represents a connection to that lost youth.
The hair tie could be a connection to her past. Maybe it was from a special event or person. For example, it could be from a school event where she had a great time with friends. In the cave, it gives her a sense of normalcy and comfort in a strange environment.
It could be a symbol of love. For example, her secret admirer gave it to her, and she wears it to keep that person close to her heart, even if she doesn't know who they are yet.
It could be a simple fashion statement. Abby is known for her unique style, and the hair tie on her wrist might just be another part of that.
The hair tie on her wrist could be a symbol of her past normalcy. Maybe it was something she put on in a hurry before being kidnapped, like a reminder of her everyday routine. It could also potentially be used as a weapon or a tool for escape if she manages to get it off her wrist.
The hair tie might be related to a prophecy. In the fanfiction's lore, there could be a prophecy that mentions a girl with a black hair tie on her wrist who will save the world. Felicity, unknowingly, is that girl and as the story progresses, she discovers her true destiny.