Ken Yadanaka

No distinct physical description is given for Yadanaka, who is shown simply as a jailed convict awaiting his end behind bars. In the 2015 drama, the subtitles spell his name Yatanaka and cast him as a condemned prisoner held in Chiba Prefecture.

Almost nothing of his character is shown. He functions in the story only as one of the doomed criminals chosen for Light's trials, his crimes standing in for any real personality.

Light runs his experiment on six imprisoned convicts at once, Yadanaka being one of them. The notebook dictates that the inmate first pen a message, and at six in the evening a heart attack takes him inside his cell. That scribbled note holds a single segment of a cipher addressed to L. A day later the killings reach the Task Force and are entered into the National Police Agency's records, which Soichiro Yagami's credentials can open. L suspects Kira is experimenting and bans the press from the specifics, yet Light simply pulls the results that same day through his father's account on the family network. Armed with what the trial reveals, Light bends Kiichiro Osoreda to his will and learns the identity of the man tailing him. The drama alters the method: the notebook orders him to die at the foot of the Eiffel Tower, and since reaching Paris in the time given is impossible, he can only blurt the landmark's name to a guard before a heart attack fells him at six in the morning.