Well, family loyalty is an important theme in some 'Cersei Margaery fanfic'. Cersei is very protective of her family's name and power, while Margaery is also bound by her family's ambitions. Their actions are often influenced by their family loyalties. And the theme of deception also pops up a lot. They both lie and deceive to get what they want, and fanfics often explore the consequences of their deceptions.
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.
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 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.
One popular 'Cersei Margaery fanfic' is 'The Queenly Rivalry'. It delves into the complex relationship between the two characters, exploring their power struggles and hidden respects for each other in a very engaging way. Another great one is 'Margaery's Gambit'. In this fic, Margaery uses her wits to outmaneuver Cersei in the political arena of King's Landing, with some really interesting plot twists.
One common theme is political alliance. Given their positions in the 'Game of Thrones' world, a lot of fanfics explore how their union could change the power dynamics in Westeros. For example, they could form an alliance against common enemies like the Lannisters.
Love against all odds is also a frequent theme. Given their different family loyalties and the complex political situations, their love (if it develops) is often portrayed as something that has to overcome many obstacles. For example, in some fanfics, they have to deal with family members who oppose their relationship.
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.
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.