Sachiko Yagami

Sachiko Yagami (夜神 幸子 Yagami Sachiko) is Light's mother and Soichiro's wife. She is oblivious to Light's ownership and use of the Death Note. Ai Satō voices her in the Japanese anime and Saffron Henderson voices her in the English dub. In the films, Michiko Godai portrays her.

Obata said that he had no real concept behind the design of Sachiko; he said that he encountered difficulty in drawing female characters who were not the main characters.

Ohba did not include Sachiko in the final chapter of the manga. He said the outcome would likely be that someone would tell her that Light and Soichiro died in order to stop Kira. The Task Force members would never let the world know the truth about the Death Note case.