Another theme could be survival. In the world that Cersei inhabits, which is full of political intrigue and danger, an oc might be in a situation where they have to team up with Cersei just to survive. And this alliance can lead to all sorts of character development and plot twists.
One common theme could be power dynamics. Since Cersei is a powerful character, exploring how an original character (oc) interacts with her in terms of power can be interesting.
Power dynamics is a very common theme. Since Cersei is a powerful figure in the Game of Thrones universe, seeing how an OC interacts with her in terms of power - whether they are trying to gain it from her, share it, or undermine it is often explored.
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 power play. Given Cersei's character, power is often a central aspect in these fanfictions. The relationship between her and the OC might involve a struggle for power or an exchange of power in a more intimate context. Another theme could be secrecy, as their relationship might be something that needs to be hidden in the world of the story.
One common theme is the exploration of power dynamics. Given their different positions in the original story, fanfics often play with how they interact in terms of power.
One of the main themes is identity. The oc in the fanfic can make Cersei question her own identity, like in 'The Identity Crisis of Cersei' fanfic. Survival is another big theme. In a world full of political intrigue and danger, Cersei and the oc must find ways to survive. And then there's the theme of change. Cersei is a complex character, and the oc can be the catalyst for her to change, either for better or worse.
Power is a very common theme. Cersei is known for her thirst for power, and Ned is a man of honor who also has his own form of power in the North. Their interactions often revolve around power dynamics, like who has the upper hand in a situation.
Power is a common theme. Both Cersei and Daenerys are power - hungry in their own ways in the original series, and fanfics often explore how they either compete or cooperate regarding power. For example, in many fanfics, they fight over who will rule Westeros.
Power is a very common theme. Cersei is a powerful woman and Lancel is often caught in her web of power. Another theme is betrayal, as their relationship can be seen as a form of betrayal in the context of the existing power structures in Westeros.
One common theme is rivalry. Their competition for the throne and influence over the king is often the focus. For example, in many fanfics, Cersei sees Margaery as a threat to her position as Queen. Also, the theme of femininity and how they use their gender to their advantage or disadvantage in a male - dominated world is quite common. In some fanfics, Margaery uses her femininity more subtly than Cersei, which creates interesting dynamics.
One common theme is forbidden love. Their relationship is not exactly socially acceptable in the context of the world they live in, so many fanfics explore the challenges they face because of this.