Light Yagami's actions have a significant impact on his own mental well-being throughout the series "Death Note." As he continues to use the Death Note to eliminate criminals and those he deems unworthy, he becomes increasingly consumed by power, paranoia, and a distorted sense of justice. His descent into moral ambiguity and obsession with control leads to a decline in his mental health, causing him to become isolated, distrustful, and ultimately losing touch with his own humanity. This ultimately results in a tragic downfall for his character.
