In "Death Note," the consequences of playing god are prominently shown through the character Light Yagami, who uses the Death Note to eliminate criminals and those he deems as threats to society. As Light takes on the role of judging and executing individuals, he becomes more power-hungry and detached from his humanity, leading to a descent into darkness and moral corruption. The series explores the ethical dilemmas and psychological toll of wielding such power, ultimately illustrating that attempting to play god comes with severe consequences and a loss of one's own humanity.