As described in "13: How to Read", Justin is the right-hand man of the Shinigami King and sits on a throne. Highly intelligent, Justin knows everything there is to know about the Death Note, and Shinigami often go to him in trouble.Obata describes him as "conceited."[1 Justin provides Sidoh with several scrolls describing the various rules that Shinigami have for interacting with humans, which Sidoh uses to guide his interactions with Mello in the human world. The scrolls are not mentioned in the anime.