Yousuke Itsuki

A freelance writer who first appeared in "Legend of Lake Hiren" and they become friends after the case. Later on, he helped Kindaichi during his run in "Kindaichi the Killer." Since then he has become a press/media contact for Kindaichi and uses his position as a writer to perform background checks on suspects. His sources are very reliable; however, in "Kindaichi the Killer," Itsuki will discover that one of his friends, who supposedly tries to help, may be a prime suspect. He also appears in a small role in "The Gentleman Thief."

(Source: Wikipedia)