Light Yagami's actions in the anime "Death Note" have a significant impact on his own sense of identity and purpose. Initially, he acquires the Death Note with the intention of creating a better world by eliminating criminals. However, as he continues to use the Death Note to serve his own sense of justice, he becomes consumed by power and arrogance. This gradual transformation leads to a shift in his identity, as he begins to see himself as a god-like figure with the authority to determine who lives and who dies. His sense of purpose also evolves, shifting from a desire for justice to a thirst for control and domination. Ultimately, Light's actions lead him down a dark path where he loses touch with his original values and becomes a ruthless and morally ambiguous character.