In Death Note, manipulation of emotions plays a significant role in Light Yagami's plans as he uses emotional manipulation to control and influence those around him. By exploiting people's emotions such as fear, guilt, and trust, Light is able to manipulate situations to his advantage and further his goal of creating a new world order as the self-proclaimed "god" Kira. His ability to understand and manipulate emotions allows him to manipulate others into acting in ways that serve his ultimate purpose of eliminating criminals and establishing himself as a powerful figure in society.