Light Yagami, the protagonist of the anime series "Death Note," is known for his strategic and manipulative nature. He often uses the manipulation of his own emotions and those of others as a key tactic in his plans. By controlling his own emotions, Light is able to appear calm and calculated, giving him an advantage in high-pressure situations. Additionally, by manipulating the emotions of others, Light can influence their actions and decisions, furthering his own agendas. This manipulation of emotions is a crucial aspect of Light's strategies as he navigates the complex world of the Death Note and tries to achieve his goals.