Light Yagami, the main character in the anime "Death Note," uses the Death Note to manipulate fate and chance in his plans to create a world free of crime. By controlling the circumstances surrounding his targets' deaths, Light is able to shape events in his favor, ensuring that his plans to become the god-like figure Kira are successful. The manipulation of fate and chance allows Light to stay one step ahead of his adversaries and maintain his facade as a righteous vigilante, ultimately leading to a complex and morally ambiguous narrative.