Throughout the series, Light Yagami's interactions with Ryuk are significant in several ways. Firstly, Ryuk serves as a constant reminder to Light of the consequences of using the Death Note, as well as acting as a sort of devil on his shoulder, encouraging his descent into darkness. Secondly, Ryuk's presence highlights the theme of morality and the blurred lines between good and evil in the series. Lastly, their interactions also showcase the power dynamics between humans and supernatural beings, as well as the complexities of their relationship and how it evolves over time.
