Revenge is another theme. Given the many slights and betrayals Cersei experiences in the original story, fanfictions sometimes focus on her seeking revenge. It could be revenge against her enemies in King's Landing or those who have wronged her family in the past.
One common theme is the struggle for power. Even while pregnant, Cersei is a character who desires power. So many fanfictions explore how she tries to maintain or gain more power during her pregnancy. Another theme could be family. Her pregnancy might change her relationships with her family members, and this is often explored in these stories.
Power is a common theme. Cersei is all about power, and when an OC is introduced, the power dynamic becomes a central focus. Whether the OC is trying to gain power through Cersei or is a threat to her power, it drives the story. Another theme is loyalty. Cersei values loyalty, but also has a hard time trusting. So, the OC's loyalty or lack thereof can create a lot of tension. Love can also be a theme, though it might be a twisted form of love, given Cersei's nature.
One common theme is the idea of enemies - to - lovers. Given their opposing positions in the original story, it's interesting to see how fanfic writers transform their relationship. Another theme could be political intrigue. Since both are involved in the power games of Westeros, fanfictions often explore how their relationship affects the political landscape.
Redemption is also a theme in some fan fictions. Given their often - immoral actions in the original story, some fan fictions explore the idea of Jaime and Cersei seeking redemption, either together or separately, and how this affects their relationship and their place in the world of Westeros.
One common theme is the struggle for power within the Lannister family dynamic. Since Cersei is so power - hungry, her OC daughter might also be drawn into the power games of King's Landing. Another theme could be the idea of identity. Growing up as a Lannister has its own set of expectations, and the OC daughter may have to figure out who she really is outside of her family's reputation. Also, themes of love and betrayal often come up. She might face situations where she has to choose between loyalty to her family and her own feelings.
Well, in a Naruto and Cersei Lannister fanfiction, Naruto's ninja skills would be a novelty in Westeros. Cersei might be both intrigued and threatened by him. Naruto, on the other hand, would probably be confused by the complex politics of the Seven Kingdoms. The story could explore how Naruto's values of loyalty and friendship could either influence Cersei or be corrupted by her manipulative nature. It could also show how the people of Westeros react to this strange, powerful newcomer.
Family loyalty and betrayal. The Lannister family has a complex web of relationships. Fanfictions might show characters being loyal to their family despite their flaws, or they might depict a character betraying the family for various reasons. For example, a story could be about a Lannister who betrays the family for love or a different ideology. This adds a lot of drama and conflict to the story.
A common theme is Cersei's descent into madness. Fanfics may detail how her paranoia and thirst for power gradually consume her, without involving sexual content. Also, her relationship with her father Tywin can be a theme, showing how his expectations and treatment of her affected her development as a character.
There's also 'Cersei and the Unknown Heir'. In this fanfiction, the OC is a supposed heir to a powerful house and how Cersei deals with this threat and possible alliance is the focus. It's full of political intrigue which is typical of Cersei's storylines.
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.