An interesting plot could be that the Stark family discovers a portal to the Naruto universe. Sansa Stark, being the politically astute character she is, tries to learn about the power structures in the ninja world. Meanwhile, Naruto and his friends are intrigued by the Starks' noble demeanor. They form an alliance to fight a common enemy that somehow threatens both their worlds, like a powerful dark force that has the ability to manipulate time and space.
One cool plot could be that Tony Stark is transported to Westeros right before the onset of the Long Night. He teams up with Bran Stark, using his technology to help Bran better understand the visions he has of the past and future. Stark also uses his suit to fight the White Walkers, creating a new type of weapon against the ice - based enemies. His presence also causes a stir among the various houses, who either want to use his power for their own gain or see him as a threat.
An interesting plot could be that Naruto is transported to the world of Game of Thrones through some kind of magical portal. He quickly becomes involved in the power struggles as he tries to find a way back home. Along the way, he meets various female characters who are drawn to his courage and his strange powers. These women form a harem around him, and Naruto has to balance his relationships with them while also trying not to get caught up in the deadly Game of Thrones politics.
A possible plot could be that Naruto arrives in Westeros during a time of great turmoil, like the War of the Five Kings. His op abilities would make him a valuable asset to different sides. However, he would also face challenges as his values of friendship and loyalty might not be fully understood. He could try to form his own group of allies, made up of both the common people and some of the more honorable knights, to fight against the tyranny and power - hungry lords. His powers would be used to turn the tide of battles, but the political web would still be difficult for him to navigate.
Well, he'd probably try to use his technology to outwit the political schemes in Westeros. Maybe he'd create some sort of high - tech armor to protect himself from the swords and arrows. He could also use his intelligence to manipulate the power struggles, like he did in the MCU.
One possible plot could be Lelouch using his Geass power to manipulate the power - hungry lords in Westeros. He might start by influencing the Lannisters, creating chaos within their ranks and using their downfall to his advantage, perhaps to gain a hold on the Iron Throne.
A cool plot could be that Godzilla is lured to Westeros by the magic of the dragons. The dragons' power somehow calls to Godzilla across different dimensions or something. And then, once Godzilla arrives, it starts causing chaos. The different houses have to put aside their feuds and figure out a way to deal with this giant monster.
One interesting Stark fanfiction could be about Arya's adventures beyond what we saw in the show. Maybe she travels to a far - off land and uses her skills to become a legend there. Another could focus on Sansa ruling Winterfell in a more peaceful time, building it up into a prosperous stronghold. And there might be a fanfiction where Bran uses his powers to prevent some of the tragedies that befell the Starks in the original series.
The male OC Stark heir could be thrust into the role of leadership much earlier than expected due to unforeseen circumstances, like the sudden death of his father. He then has to deal with the challenges of ruling Winterfell, such as food shortages, disputes among the vassals, and the ever - present threat of the White Walkers. He uses his unique skills and the support of his loyal followers to overcome these obstacles and restore the Stark name to its former glory.
A plot where Deadpool somehow becomes a king would be really interesting. He'd probably run the kingdom in the most unorthodox way, making strange laws and having his own brand of 'justice'. For example, instead of beheading traitors, he might make them do stand - up comedy about their crimes.
The plot could involve Arya being kidnapped by a group of bandits. They gag her to keep her quiet as they plan to ransom her. But Arya uses her training to manipulate the situation. She might try to communicate with other captives or find a way to get the gag off and fight back.