The younger characters in 'Game of Thrones' like Arya Stark and Sansa Stark could be quite taken with the Beatles' music. Arya might find the rhythm and the lyrics inspiring in her own journey of self - discovery and revenge. Sansa, who has always been more into the cultural aspects of court life, would likely see it as a new form of art to be embraced. The more traditional and conservative characters like Lord Walder Frey would likely condemn it as a foreign and ungodly noise that goes against the values of the Seven Kingdoms.
Well, the Night's Watch might find the Beatles' music a welcome distraction from the harsh reality of guarding the Wall. The music could bring a sense of hope and warmth to their cold and desolate lives. Daenerys Targaryen might see it as a symbol of a different kind of power, not the kind she wields with her dragons but a power that can move people's hearts. She could use it to win the loyalty of the common people in the cities she conquers. And the White Walkers? Maybe the music has no effect on them at all as they are creatures of ice and death, indifferent to the beauty of music.
Jon Snow would likely be very cautious. He's used to dealing with magic in a more traditional Westerosi way, like with the Red Priestess. The Infinity Gauntlet would be something completely new and he'd probably be worried about its power corrupting those around him.
Daenerys Targaryen would likely see the navy destroyer as both a threat and an opportunity. She might try to either capture it and add it to her forces or form an alliance with its crew if she believes it could help her in her quest for the Iron Throne. She's used to having powerful weapons like her dragons, and this could be another tool in her arsenal.
The Lannisters would be terrified. Cersei, in particular, would see her power slipping away as Robert would surely not tolerate her and Jaime's relationship any longer. Tyrion might be more ambivalent, seeing an opportunity to perhaps gain more influence or at least not be at the mercy of his family. The Starks would be cautious. Ned's children might be resentful of Robert for leaving them in a precarious position after his death, but also might hope that he could restore some order.
Daenerys could view the war as a fight for liberation in some ways. Just as she wants to free the slaves in her world, she might empathize with the countries fighting against tyranny in WW2. However, she would also be horrified by the death toll and the fact that civilians were so often caught in the crossfire.
Jon Snow might see it as a chance to finally make the North truly independent. He would probably use the gold to fortify the Wall and protect the realm from the threats beyond. Sansa, on the other hand, could use it to improve the living conditions of the people in the North, building more shelters and providing food during the harsh winters.
Cersei would likely be furious. She sees Sansa as a rival and the idea of her father marrying the girl she hates would be intolerable. She might try to undermine Sansa at every turn. Jaime, on the other hand, might be more indifferent. He has his own issues to deal with and may just see it as another one of his father's political maneuvers. Tyrion would probably be amused and a bit worried. Amused because it's such an unexpected pairing, and worried because he knows how dangerous his father can be and how vulnerable Sansa is in this situation.
A character like Arya Stark might initially be very cautious. Given her training as a Faceless Man, she would be skeptical of new powers. But she could also see the potential for using the Rinnegan's powers for her own vengeance. She might try to use the power of seeing chakra points to target her enemies more effectively.
For characters like Arya, she might be a bit skeptical. She's used to her own real - life adventures in Westeros, and seeing some far - fetched fanfiction might make her roll her eyes. However, she could also find some that are really well - written and get into it. And for Cersei, if the fanfiction shows her in a bad light, she would likely be furious and want to put an end to it. But if it gives her a more sympathetic view, she might be secretly pleased.
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.
One possible story could be that the four Beatles are reborn in the world of 'Game of Thrones'. John Lennon could be a maester, using his wisdom and unique perspective to advise a powerful lord. Paul McCartney might be a minstrel, his music charming the people of Westeros. George Harrison could be a spiritual figure, perhaps in a religious order like the Red Priests, spreading a new kind of peaceful ideology. Ringo Starr could be a loyal squire to a brave knight. Their presence would disrupt the normal power dynamics as they introduce new ideas and a different kind of culture from their own time.