One possible cause could be political intrigue. In the world of Westeros, Cersei has many enemies. Perhaps a rival noble family finally manages to outmaneuver her in the power games, leading to her demise. For example, they might stage a coup and execute her.
Sansa Stark could be an interesting pairing. It could be a story of two strong - willed women from opposing sides. They could either become bitter enemies or, in a more creative take, find common ground and form an unexpected alliance. Also, Margaery Tyrell is a great character to pair with Cersei. Their power struggle in the show was fascinating, and fanfiction could take it in new directions, like Margaery actually befriending Cersei and showing her a different way to rule.
If Naruto got the Death Note, it would be a complete chaos. Naruto has a strong sense of justice, but his understanding of it is very different from Light's in Death Note. He might initially be horrified by the power of the Death Note and try to destroy it. However, if he decided to use it, he could potentially target powerful enemies like Orochimaru or Pain without having to engage in direct combat. But this would also corrupt his ninja way as killing without a fair fight goes against his beliefs. He would likely struggle with the moral implications throughout the story.
I think 'cersei and sansa fanfic' can be really interesting. It often explores the complex relationship between two very different characters. In many fanfics, they might start as enemies but develop a more nuanced connection over time. Maybe there's a plot where they have to work together against a common enemy in the Seven Kingdoms.
One interesting plotline could be an alternate universe where Jaime decides to fully turn against Cersei much earlier. He might expose her secrets to save the realm from her tyranny, leading to a complex power struggle within King's Landing.
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.
He could be suspected by Voldemort. Since Voldemort is very paranoid, an injury at a meeting might make him think Snape is up to something or being careless in a way that could endanger their plans.
In some fanfiction, Jaime's character might develop into a more remorseful figure. His relationship with Cersei could be a source of internal conflict, and he could start to question his loyalty to her more deeply, leading to a change in his actions and decisions.
Tyrion could be a great addition. His relationship with Cersei is complex, and his intelligence and wit could add a lot of depth to the story. He might be a mediator or a source of conflict between Jon and Cersei. For example, he could try to manipulate the situation to his own advantage while also trying to protect his sister in some way.
They're popular because Cersei is such a complex character. People are intrigued by the idea of her winning as it goes against the norm in the original story. It offers a different take on the power dynamics in Westeros.