What forces motivate the characters?
There are many forces in "Oedipus Rex", however the strongest one is the force of knowledge. The knowledge of the prophecy caused Oedipus to leave his home to try to protect his parents. Also, it was the knowledge that Oedipus was her son that caused Jocasta to hang herself.
The force in the poem "Scars" is the force of time, changing how the son sees his father. When the boy was young, he admired his father's scars and wanted some of his own. However, after time passed, the boy grew up and he realized that his view of his father had become less of admiration and more of sadness that he and his father hadn't bonded as much as he used to think.
The Mortal Instruments: City of Bones
The forces of chance motivate the characters of "The City of Bones" a lot, due to the fact that without the chance meeting between Clary and Jace, Clary's life would have remained perfectly normal. It was this meeting when Clary saw here first demon being killed, her first Shadowhunter patrol, and the end of the world she knew.
Harry Potter and the Sorcerer's Stone
In "Harry Potter and the Sorcerer's Stone" Harry is motivated by the forces of his past experiences to stick up for his classmate against Draco Malfoy. This force motivates him to challenge Malfoy to get back Neville Longbottom's remembrall.
Percy Jackson and the Lightning Thief.
During the course of Percy's journey, he is influenced by the forces of fate/destiny. These forces motivate him to return Zeus's master bolt and clear his father's name, as well as finding out who framed him.