Light Yagami's actions, particularly his usage of the Death Note and his pursuit of becoming the "god of the new world," progressively lead to a significant decline in his mental and emotional state. As he delves deeper into his role as Kira and is consumed by his desire for power and control, Light's personality undergoes a transformation. He becomes increasingly isolated, paranoid, and detached from his original values and relationships. The weight of the consequences of his actions takes a toll on his psyche, causing him to exhibit signs of megalomania and psychological instability. Ultimately, his descent into darkness leads to a tragic end, showcasing the detrimental impact his actions have on his mental and emotional well-being.
