The main character of the series is Jake Hunter (known in Japan as Saburō Jingūji (神宮寺三郎 Jingūji Saburō)), a 32 year-old private detective who operates a detective agency in Aspicio, USA (Shinjuku, Tokyo in Japanese versions). He was born as the third son of a wealthy business enterprise owner, and traveled to New York during his youth to work as an assistant detective. He is a heavy smoker, and often assembles his thoughts while smoking a Marlboro cigarette. According to his in-game profile, his favorite alcoholic beverage is cognac, and he drives a green Mini Cooper.
Source: Wikipedia, "Jake Hunter", available under the CC-BY-SA License.