Shinichi Tsukumoya

General
Tsukumoya Shinichi (九十九屋 真一), is the narrator of the light novels as well as an online Information Broker of sorts. Claiming to be in his chatroom 24/7, Tsukumoya acts as the prime Information supplier for Orihara Izaya. In order to get into contact with Tsukumoya, Izaya often logged into his chatroom.

Tsukumoya claims that he usually knows what his clients are going to ask, because he can see what they were looking up on their computers prior to their visit. Although he says this, Tsukumoya claims that he's not hacking anything.

Tsukumoya Shinichi and Izaya Orihara go back several years. The online informant first contacted Izaya when Izaya was still in high school. Izaya had created a game in his free time, although he had only given a copy of the game to Shinra Kishitani, Tsukumoya somehow got his hands on it. After sending Izaya a taunting email about the game, their interactions begin.