Arya's character might develop in terms of her leadership skills. From being a lone wolf, she has to become a leader. She'll learn to make decisions for the greater good of Winterfell, not just for her own survival.
One possible plot is that Arya comes back to Winterfell with new allies she made during her adventures. These allies could be from different regions or cultures, and they bring with them unique skills and knowledge. Her return might also stir up old rivalries among the people in Winterfell. Some might be jealous of her newfound skills and experiences, while others might see her as a symbol of hope. And as she settles back into Winterfell, she has to navigate the complex web of relationships and power dynamics that have changed in her absence.
Arya could encounter old friends like Gendry. Their relationship might have evolved during her time away, and there could be new feelings or just a strengthened bond of friendship. Also, she may come across some of the younger Stark bannermen who have grown up in her absence and now look up to her as a hero.
One interesting plot point could be how Arya uses her unique skills learned during her travels to defend Winterfell. For example, her skills in stealth and assassination might be used to uncover and thwart hidden threats within the castle.
She will most likely interact with her siblings, like Sansa. They could have a heart - to - heart conversation about their past experiences and how they have changed. Also, Jon Snow might be one of the characters she meets. Their relationship could be further explored, especially considering Jon's leadership in Winterfell.
Family is a very common theme. Since the Starks are a large and important family in Winterfell, many fanfics explore their family bonds, loyalty, and rivalries. Another common theme is survival, especially during the harsh winters that Winterfell often faces.
One possible plot development could be Arya reuniting with her family members. She might share her adventures and skills she has acquired during her time away. Another could be her getting involved in the political affairs of Winterfell, using her wits to help protect the castle and its people.
One possible storyline could be Tony Stark bringing his technological genius to Winterfell. He might start by upgrading their defenses. For example, he could create some sort of energy shield around the castle, similar to the one he had in Stark Tower. This would protect Winterfell from the White Walkers and other threats. He could also work on improving their weapons, making swords and arrows with some advanced alloys he developed. Maybe he'd even introduce some basic robotics to help with tasks like scouting or carrying supplies. Another aspect could be his interactions with the characters there. He'd probably get along well with Bran, as they both have a deep understanding of different forms of knowledge. Stark could share his knowledge of the outside world with the people of Winterfell, and in return, learn about their ancient ways and magic.
Jon Snow could be paired with Arya. They could go on a quest to find something important, like a long - lost heirloom of House Stark. Along the way, they share stories of their past adventures and strengthen their bond as siblings, while also facing various challenges from the elements and enemies.