What Ryuk Truly Represents in Death Note

Just some Death Note theory I had in mind, I'll do another one later on that'll take upon a somewhat heavier and darker subject about Death Note after enough research.
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Credits for the music goes to Yoshihisa Hirano and Hideki Taniuchi.
Intro clip used:
Death Note - Episode 01
Music used:
Death Note OST - The Kira Special Investigation Unit (Tokuso Kira Han) (slowed)
Death Note OST - Light's Theme (slowed)
I do not intend to make any profit of videos where I use copyrighted material, if requested by those whose have credits goes to, I'll change/remove the content in question.
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Chapters:
Intro : 0:00 - 0:26
Chapter 1 : 0:26 - 2:15
Chapter 2 : 2:15 - 3:18
Chapter 3 : 3:18 - 4:55
Chapter 4 : 4:55 - 5:46