It could be really interesting. Maybe the great houses would be like powerful corporate families. The Starks could be a family in a cold northern region, running a large logging or mining business. The Lannisters would be super rich and involved in finance or media. There would be modern weapons instead of swords and bows, but the political intrigue and power struggles would remain the same.
I think Tyrion would still be really interesting. He's so clever and adaptable. In a modern setting, he could be a brilliant strategist in business or politics, using his wits to outmaneuver his opponents just like he did in the show.
Arya would likely be very defiant. She has been through so much in the original 'Game of Thrones' series that being kidnapped wouldn't break her spirit. She'd immediately start looking for weaknesses in her captors and any possible means of escape. For example, she might study their routines, when they bring her food or check on her, and plan her escape around that.
It could be really interesting. Maybe the characters from RWBY could be placed in the complex political landscape of Westeros. For example, Ruby could be like a young knight trying to prove herself in a world full of backstabbing and power struggles. Weiss might be a noble trying to uphold her family's honor in a different way than she does in her own world.
In such a fanfic, the story could follow Naruto's journey to become the Hokage but in the context of the Iron Throne. He would have to deal with the backstabbing politics of Westeros. His friends would be his allies, like Sakura as a healer like in Naruto, but also having to navigate the dangerous court politics. And the Akatsuki could be a group similar to the Night's Watch, but with their own evil motives.
A 'Game of Thrones' and guns fanfic could be really interesting. Maybe it would be set in an alternate Westeros where guns have been introduced. The characters would have to adapt to this new form of weaponry. For example, Arya Stark might use a gun instead of her Needle in some situations. It could also change the power dynamics in battles and political intrigue.
Definitely Tyrion Lannister. In a modern setting, he could be a brilliant but underestimated lawyer, using his wits to outmaneuver his opponents in the courtroom, much like he did in the political intrigue of Westeros. Daenerys Targaryen would also be great. She could be a strong - willed businesswoman or a political leader, fighting for the rights of the underprivileged.
One idea could be that in modern day, Arya is kidnapped by a rival business syndicate who mistake her for someone who has crucial information about a major deal. They hold her in an abandoned warehouse. Her Stark family then uses their influence and resources to track her down. They also enlist the help of some of Arya's old friends from her training days, who use their stealth skills to infiltrate the kidnappers' hideout.
In a 'John Wick Game of Thrones' fanfic, it could be a mix of the modern - day assassin vibes of John Wick and the medieval - like setting of Game of Thrones. John Wick might bring his own code of honor, which could either clash or align with the honor systems in Westeros. For instance, his loyalty to a cause or a person could be compared to the loyalty oaths in Game of Thrones. And his ability to track down his targets would be very useful in a world full of political enemies and traitors. There could be epic battles where he uses his signature gun - fu against swords and arrows. Also, his backstory as a former assassin trying to get out of the life could be paralleled with characters in Game of Thrones who are trying to break free from their fates or obligations.
It could be really interesting. Maybe Sherlock Holmes would be transported to the world of Game of Thrones. He would use his brilliant deductive skills to solve the mysteries in Westeros. For example, he could figure out who was behind the sudden deaths of some important lords, or he could discover the secrets of the White Walkers much faster than the people in the show.
A 'Iron Man Game of Thrones' fanfic could have some really interesting plot elements. For example, Iron Man's technology and modern - day thinking would clash with the medieval - like society of Westeros. He might try to introduce new forms of governance or technology, like trying to build a power plant in King's Landing. At the same time, the political intrigue of 'Game of Thrones' would likely draw Iron Man into the complex web of alliances and betrayals. He might find himself having to choose sides in the struggle for the Iron Throne, or perhaps try to create his own independent kingdom using his technological prowess. And of course, there would be the potential for some really cool battle scenes, with Iron Man's suit against the dragons or the armies of Westeros.