Light Yagami's actions, particularly as the main character in the manga and anime series "Death Note," have a significant and complex impact on the psychological well-being of those around him. His manipulative and morally questionable behavior creates an atmosphere of fear, paranoia, and distrust among his friends, family, and adversaries. Many characters experience intense psychological stress, anxiety, and even trauma as a result of Light's actions, as they struggle to navigate the ethical dilemmas and moral conflicts he presents. In essence, Light's actions lead to a deteriorating psychological state for those caught in his orbit, ultimately highlighting the destructive power of his choices on the mental health of others.