"Game of Thrones" Season 7 will bring back Cersei as the biggest female anti-hero on TV. There are numerous predictions that revolve on what the story between Jaime and Cersei will turn out to be. "Game of Thrones" Season 7 might see Jaime turning against his lady love/sister.
There are so many predictions on the plot like on who would be the "Mad Queen." Earlier, there were suspicions whether Daenerys Targaryen would turn around and might become the Queen who will burn her city. However, it is becoming clearer that Cersei is on the way to turn as evil as she can be. It will be Cersei who will emulate The Mad King now in "Game of Thrones" Season 7.
What defines Cersei are attributes like ambition, ruthlessness, and loyalty to her children. Though she is not dumb, she made a lot of mistakes. She helped the High Sparrow to rise to power. This created problems for herself. She also made enemies everywhere.
Will Jaime Turn "Queen-Slayer?"
"Game of Thrones" Season 7 might turn Jaime into Queen Slayer. In the previous season, we saw that he was visibly upset with Cersei's doings. He did not shy away from killing a mad ruler earlier, so he might do it again if it would help save the city and the people. Moreover, he is already estranged emotionally from Cersei, reported Inverse.
In the books, Cersei visits the witch who predicted her future earlier when she was a child again. The witch had also predicted her children's deaths. Also, the witch tells her she'll meet her own end at the hands of "the Valonquor," which means "little brother." Though it might indicate Tyrion Lannister, it might as well be Jaime as he was born after her, reported YIBADA.
Jaime might have to use his sword again to kill a ruler. Will Mountain strike back? How many people will Cersei take along with her if she falls? Jaime is traumatized already by his children's death and with Cersei's actions. It is highly probable that he will strike her. After all, a Lannister always pays his debts.