Another plot could involve Arya traveling into the future of Westeros. She might find a world where the Iron Throne no longer exists and new powers have emerged. She'd have to adapt to this new world while still holding onto her old values and skills. This could lead to interesting interactions with new characters who have different beliefs and ways of life.
One idea could be Arya traveling back to the time before her family's downfall. She could use her skills to prevent certain events from happening, like Ned Stark's execution. Maybe she'd change the course of battles by secretly assassinating key enemies.
One plot idea could be Arya having to deal with political intrigue in the North. Maybe there are rival lords who don't fully accept her as Queen and she has to outwit them. Another could be Arya facing an external threat like a new wildling uprising, but she uses her unique skills to handle it. And perhaps she could be on a quest to find a long - lost Stark heirloom that is said to have the power to unite the North even more firmly under her rule.
One plot idea could be Arya traveling back in time to the days before her family's downfall. She could use her knowledge and skills to prevent certain events from happening. For example, she might stop Ned Stark from making some of the political missteps that led to his execution. Another idea is Arya traveling to the future of Westeros. She could see the long - term consequences of the power struggles she was part of and try to change things in her own time. Maybe she'd witness a new dynasty rising or a great war that she could try to avert.
One idea could be that Tony Stark travels back in time to prevent the creation of certain dangerous technologies that later cause chaos in his timeline. He could use his genius to subtly alter the course of scientific development.
One plot idea could be Arya, in disguise, getting close to Tywin as a servant in King's Landing. She could overhear his plans and use that knowledge to try and undermine the Lannisters from within. Another could be a scenario where Tywin discovers Arya's true identity but decides to keep her alive for some strategic reason, perhaps to use her as a bargaining chip against the Starks. And a third idea might be a story set in an alternate universe where Arya and Tywin form an unlikely alliance against a common, greater threat, like a White Walker invasion in the south before the events at the Wall.
One plot idea could be Arya and Jon teaming up to uncover a long - hidden family secret. Maybe there's a lost Stark heirloom that has some sort of power, and they have to go on a quest to find it. Another idea is that they are both sent on a diplomatic mission to an unfriendly kingdom, and they have to use their unique skills - Arya's stealth and Jon's leadership - to succeed.
One plot idea could be that Arya and Aegon meet during their travels. Aegon, with his claim to the Iron Throne, is in need of a skilled ally like Arya. She could help him in his political maneuverings in a way that no one else can, using her skills of disguise and stealth. Another could be a story where they are forced to team up against a common enemy, like a new threat rising in the Seven Kingdoms that neither the Starks nor the Targaryens can face alone. They start off distrustful of each other but gradually come to respect and rely on one another.
Maybe all the Starks, including Pepper and Morgan, travel back to the time when Howard Stark was starting out in business. They could help him with modern knowledge, and in the process, they might accidentally change some key events that lead to unforeseen consequences, like a new kind of Iron Man suit being created much earlier.
One idea could be that the male OC is a foreign noble who comes to Winterfell. He has unique fighting skills and Arya is intrigued. They start training together in secret, and as they do, a deep bond forms. This could lead to them going on adventures together, facing threats to the North.
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.
In a time - travel fanfic, Arya's character could develop a sense of timelessness. She has seen so much death and destruction in her own time. But by traveling through time, she might start to see the bigger picture of the cycle of life and power in Westeros. This could make her more philosophical, and perhaps she'd be less driven by revenge and more focused on the long - term well - being of the realm.