The twin's recognition of Arya could also lead to a change in Arya's character arc. Up until that point, Arya may have been operating in a certain way, but the encounter with the twin makes her reevaluate her goals. If the twin is a positive influence, Arya might start to consider more peaceful or diplomatic solutions to the problems she faces. On the other hand, if the twin has ulterior motives, Arya could become more guarded and distrustful, further hardening her already tough exterior.
The twin could be a long - lost relative of Arya. Maybe they are from a branch of the Stark family that was thought to be dead or lost. This would add an interesting layer to the story as they would share some of the Stark blood and loyalty.
One possible plot could be Arya using the brothel as a cover. She might be spying on certain characters who frequent the place. Since she has skills in disguise and stealth, she could blend in among the workers or patrons to gather information for her own purposes, like revenge or to aid in the political chaos of Westeros.
A plot twist could be that when Arya saves her mom, they find out that there was a prophecy involved all along. The prophecy states that Arya's actions will set off a chain of events that will either save or doom the Seven Kingdoms. Now they have to decide what to do with this newfound knowledge and whether to act on it or try to keep it a secret.
In some fanfics, Arya's betrothal might lead to her learning new courtly manners. For example, she could be betrothed to a noble from a far - off land. This would force her to adapt to different cultural norms, which is a huge change from her assassin - training days. She might struggle with the idea of being a lady but also use her skills to navigate the political intrigue that comes with such a union.
Another development could be that their wedding sparks a series of events that change the power dynamics in Westeros. The union of a Stark and a Lannister, even an unwanted one like theirs, could cause other houses to re - evaluate their alliances. Some might see it as an opportunity to ally with this new 'power couple' while others might view it as a threat and plot against them.
One possible plot could be Arya Stark rebuilding the Stark legacy all by herself. She might use her skills as a Faceless Man to secretly eliminate threats to Winterfell and the North. For example, she could target those who had a part in the downfall of her family during the chaos of the Game of Thrones. With her unique abilities, she would be able to move in the shadows and slowly but surely regain the power and respect that the Stark name once held.
In a fanfic, Arya could be in the brothel to rescue someone. It could be a young girl who was sold into prostitution against her will. Arya, with her skills and no - nonsense attitude, decides to take matters into her own hands. She has to outwit the brothel owner and any guards, and this adventure in the brothel could be a new chapter in her journey of self - discovery and growth as a character.
One possible storyline could be that Arya, being the resourceful character she is, tries to figure out how to hatch the dragon egg. She might embark on a journey to find ancient knowledge or a sorcerer who could help her. Maybe she faces many challenges along the way, like being hunted by those who want the egg for themselves.
In some fanfictions, there might be a plot where Jaqen actually has a deeper connection to Arya's family than she initially realizes. Maybe he was secretly tasked with protecting her all along. This could lead to a series of revelations and a change in their relationship dynamics, from mentor - student to something more like comrades in a grander scheme.
If Arya killed Joffrey in a fanfic, one possibility is that she would become an instant target for the Lannisters. They would stop at nothing to avenge Joffrey's death. Arya would have to go into deeper hiding or rely on her Faceless Men training even more. Maybe she'd have to flee across the Narrow Sea and start a new life in Essos, constantly looking over her shoulder for Lannister assassins.