Ryuk is a fictional character from the manga and anime series Death Note, created by Tsugumi Ohba and Takeshi Obata. He is a Shinigami, or death god, who drops a mysterious notebook called the Death Note into the human world. This notebook allows its user to kill anyone by writing their name while picturing their face. Ryuk is characterized by his tall, skeletal appearance and a mischievous personality. He enjoys observing human behavior and is particularly entertained by the chaos that ensues when the Death Note is used. His primary motivation is boredom, as he seeks amusement in the human realm.