She could also be on a quest for power. Inspired by her mother Cersei's thirst for power, she might start her own journey to gain influence. However, she may choose different methods than her mother. Instead of using manipulation and cruelty, she could focus on building alliances through kindness and mutual respect, which would be a huge contrast to the typical Lannister way.
Perhaps in fanfiction, Violet Lemon is a healer. Cersei, after being injured in a battle or political intrigue, is forced to seek help from Violet. This encounter changes Cersei's perspective as she sees kindness and selflessness in Violet that she's not used to. They then start a journey together, with Cersei learning from Violet about different values.
One interesting storyline could be the male OC being a powerful knight who is initially sent to spy on Cersei but ends up falling in love with her. He has to navigate the dangerous politics of King's Landing while keeping his feelings a secret. Another could be that the male OC is a foreign noble who comes to Westeros and forms an unexpected alliance with Cersei. They face many challenges together, like dealing with the other noble houses' plots against them.
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.
The exploration of forbidden love could be a key element. In the world of Westeros, same - sex relationships might be considered taboo. So, a Cersei Lannister lesbian fanfic could delve into how she and her partner deal with the secrecy and potential consequences of their relationship. It could also show how their relationship might change the political landscape or alliances in the story.
A plot could involve a time - travel scenario. Ned Stark somehow travels to a time when Cersei was younger and more vulnerable. Instead of seeing her as the enemy, he tries to guide her in a different path, which could lead to a completely different political landscape in Westeros. This would involve a lot of character development for Cersei as she grapples with this new perspective from Ned.
She could be developed as more empathetic. While Cersei was often self - centered and ruthless, her daughter could be shown as having a heart for the common people. For instance, she might secretly help the poor in King's Landing without her family's knowledge.
One interesting storyline could be her struggle to live up to the Batman legacy while also forging her own identity. She might face villains who target her because of her relation to Batman. For example, she could be kidnapped by a new villain who wants to use her as bait to draw out Batman.
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.
One interesting concept could be a crossover of magic systems. In Harry Potter, there is the use of wands and spells, while in Game of Thrones (where Cersei is from), there are different forms of sorcery. A fanfiction might explore how Cersei would react to the more structured magic of the Harry Potter world, or how Hogwarts students would view Cersei's brand of power - hungry and often cruel magic use. Another concept could be a political intrigue plot. Cersei is well - known for her political machinations in Westeros, and when combined with the politics of the wizarding world in Harry Potter, such as the Ministry of Magic and Hogwarts' internal power struggles, it could lead to some really complex and engaging storylines.
There might be a fanfiction where Cersei is a Slytherin student in Hogwarts. In this story, she could form alliances with other Slytherins and try to take over the school in a way similar to how she tries to gain power in King's Landing. Harry Potter and his friends would then have to stop her. It would be a great blend of the two universes' power dynamics and politics.