Ryuk is a fictional character in the manga series Death Note, created by Tsugumi Ohba and Takeshi Obata. He is a Shinigami that drops a Death Note, a notebook that allows the user to kill anyone simply by knowing their name and face, into the human world to find relief from the boredom of his own realm. It is picked up by Light Yagami, a bright high school student who uses it in an attempt to create and rule a utopia cleansed of evil, with him at the helm as a "god".
Ryuk, drawn by Takeshi Obata
Death Note is a Japanese manga series written by Tsugumi Ohba and illustrated by Takeshi Obata. It was serialized in Shueisha's shōnen manga magazine Weekly Shōnen Jump from December 2003 to May 2006, with its chapters collected in 12 tankōbon volumes. The story follows Light Yagami, a genius high school student who discovers a mysterious notebook: the "Death Note", which belonged to the shinigami Ryuk, and grants the user the supernatural ability to kill anyone whose name is written in its pages. The series centers around Light's subsequent attempts to use the Death Note to carry out a worldwide massacre of individuals whom he deems immoral and to create a crime-free society, using the alias of a god-like vigilante named "Kira", and the subsequent efforts of an elite Japanese police task force, led by enigmatic detective L, to apprehend him.
First tankōbon volume cover, featuring Light Yagami (front) and Ryuk (back)