The Valonqar : Analysis and solution.
Three questions may you ask. You will not like my answers.
—Maggy, in the dream of Cersei Lannister
Cersei: When will I wed the prince?
Maggy: Never. You will wed the king.
Cersei: I will be queen, though?
Maggy: Aye. Queen you shall be... until there comes another, younger and more beautiful, to cast you down and take all that you hold dear.
Cersei: Will the king and I have children?
Maggy: Oh, aye. Six-and-ten for him, and three for you. Gold shall be their crowns and gold their shrouds. And when your tears have drowned you, the valonqar shall wrap his hands about your pale white throat and choke the life from you.
This is the reference text, and obviously the first solution that jumps out is that Cersei has two younger brothers, Tyrion and Jaime, so 99% of fans and readers think it is Jaime, since Cersei is convinced it is Tyrion, or Tyrion himself.
But we need to consider the text. Maggy names several people in the text, so their children and younger siblings must also be considered.
The prince: Rhaegar, Jon Snow, and Dany come into play. Theoretically, we can also consider Aegon, but even if he were the real Aegon, he wouldn't be the younger son; that's Jon Snow.
The King, Robert Baratheon, Stannis, and some of the bastards would all come into play.
The youngest and most beautiful queen. Obviously, everything depends on the identity of this queen. I'll avoid discussing the theory about the youngest queen in this Valonqar topic. I'll get straight to the solution we need to connect the storylines and get to the identity of the Valonqar. Sansa Stark is the youngest and most beautiful queen who overthrows Cersei, obviously thanks to Aegon and Littlefinger. Cersei won't die on this occasion, but will be taken prisoner or manage to escape from King's Landing.
Sansa's Valonqar is Arya Stark. In the books, Arya's list of hatreds is much shorter and more defined. I believe that at least one of the important ones on the list will be killed by her, and in my opinion, it's Cersei.
Please share your opinion on this matter.