The plot could involve Naruto using his shadow clone jutsu to keep an eye on Cersei at all times. He might start off as a reluctant guard, but as he gets to know Cersei's backstory and the complex politics of Westeros, he begins to understand her better. He could use his Rasengan to fend off attackers, and his chakra control to sense any approaching danger. Cersei, in turn, might initially be suspicious of Naruto but gradually come to rely on him as a true protector.
One possible plot could be that Naruto, as Cersei's son, grows up in the world of Westeros. He might have to deal with the political intrigue and power struggles there. Since Naruto is known for his determination, he could try to bring about change in the often - cutthroat world of Westeros, perhaps using his ninja skills in a new and unexpected way.
A plot might involve Cersei seeing Naruto's ninja skills and believing he could be a useful asset in her power games. However, Naruto refuses to be used for immoral purposes. As they interact more, Naruto starts to make Cersei question her own actions and the cycle of revenge and power - seeking that has consumed her life. For example, Naruto might tell her about how he forgave his enemies in his own world, which is a completely alien concept to Cersei.
At first, Cersei would probably be haughty and distrustful of Naruto. After all, he's an unknown entity in her world. But Naruto, being Naruto, would be friendly and try to break the ice. He'd probably talk about his village and his friends back home. Cersei might be intrigued by his strange powers and his different way of looking at things. As time passes, they could develop a sort of begrudging respect for each other.
Perhaps a plot where Cersei, in a moment of desperation, summons Naruto using some dark magic. She hopes he can help her against her enemies. Naruto, being Naruto, wants to find a more peaceful solution. This leads to a series of events where Naruto has to navigate the political minefield of Westeros while also trying to reform Cersei's ways.
Well, in a 'Hokage Naruto guards Hogwarts' fanfiction, perhaps Naruto is brought to Hogwarts because Voldemort's return has created a need for a different kind of protector. Naruto, with his experience fighting powerful foes in his own world, could start by assessing the security of Hogwarts. He'd be amazed by the magic there, but soon adapt and use his chakra - based abilities along with some Hogwarts magic he picks up to keep the school safe. For example, he could use his Rasengan to fend off Dementors, as it's a powerful and concentrated form of energy.
The plot could be that Naruto is sent back in time to a pre - historic world where Cersei also exists. Naruto, with his ninja skills, has to survive in this caveman - like setting while dealing with Cersei's schemes.
One possible plot could be that their marriage is arranged for political gain. Cersei uses her wits and charm to try and gain more power within the new union, while Rhaegar is more focused on some grander vision for Westeros. Their relationship is full of tension as they have different goals.
One possible plot could be a political alliance that forms between Cersei and Ned. They might initially be at odds but gradually come to respect each other's political acumen. They could work together to fend off common enemies in King's Landing, and in the process, their relationship could develop into a complex mix of friendship and something more, with both having to navigate the tricky waters of loyalty to their respective houses.
The plot could revolve around a love - hate relationship. Ichigo, with his sense of justice, might be appalled by some of Cersei's actions at first. However, Cersei could be intrigued by Ichigo's power and different values. As they interact more, there could be a series of events that force them to rely on each other, like a looming war in Cersei's world that Ichigo gets dragged into. Their relationship could then develop into something more than just animosity, with elements of respect and perhaps even a strange form of love growing between them.
If Naruto and Cersei were to meet in a fanfiction, Naruto's sense of loyalty and friendship would contrast greatly with Cersei's self - serving nature. Naruto would probably befriend some of the outcasts in Cersei's court, which would enrage her. However, Naruto's skills in combat and his ability to inspire others could lead to a situation where some of Cersei's own soldiers start to question her leadership. This could create a power struggle where Naruto is trying to bring positive change to Westeros while Cersei is desperately trying to hold on to her power.