Light Yagami
The Death Note is discovered by Light Yagami, and Ryuk follows him around for much of the series to see how Light uses it. Ryuk has a fairly humanoid appearance. His skin is blueish gray, or a purplish color, his limbs are abnormally long, and he has bulging yellow eyes with black irises (red in the anime); in the films, he is represented by CGI.