Ryuk, a Shinigami from the Shinigami Realm, suffers eternal ennui, compelling him to drop a Death Note into the human world for amusement. His striking appearance includes grayish-blue skin, spiky black hair, elongated limbs, large yellow eyes with crimson irises, and retractable wings. He remains aloof and neutral toward human affairs, intervening only when curiosity or self-interest dictates. In *Death Note Relight 2: L’s Successors*, Ryuk honors his vow to claim Light Yagami’s life. As Light lies wounded, pleading for help, Ryuk writes his name in the Death Note, citing prior warnings and Light’s dwindling entertainment value. This reinforces Ryuk’s strict adherence to Shinigami rules and indifference to human allegiances. The manga mirrors this conclusion, with Ryuk terminating Light post-defeat as an impartial observer bound by his nature. Live-action films portray Ryuk confronting L after Light’s death, probing L’s refusal to use the Death Note before circling Tokyo Tower—a visual metaphor for his endless hunt for diversion. *L: Change the WorLd* shows Ryuk tempting L to wield the notebook, only to abandon him when L destroys it, underscoring his disdain for stagnation. The musical adaptation introduces subtle variations: Ryuk converses with Rem, vents frustration over Shinigami Realm tedium, and kills Light by biting his finger to inscribe his name. Retrieving an apple from Light’s jacket, he merges dark humor with ruthless pragmatism. *Death Note: New Generation* sees Ryuk reignite chaos by delivering a Death Note to Yuki Shien, perpetuating his cycle of catalyzing human ambition and ruin. Ryuk’s apple addiction persists across all portrayals, akin to human vices. Withdrawal triggers physical contortions, highlighting dependency while offering fleeting glimpses of humanity. His discomfort when Misa Amane hugs him reveals quirky shyness, contrasting his otherwise detached demeanor. Every iteration roots Ryuk’s actions in alleviating ennui, never human morality. He balances passive observation with strategic self-interest, securing survival within Shinigami laws while exploiting mortal folly for entertainment.