Sachiko Yagami

Sachiko Yagami (夜神•幸子, Yagami Sachiko) is the mother of Light and Sayu Yagami, and the wife of Soichiro Yagami. She is oblivious to Light's ownership and use of the Death Note.

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 "like Aizawa" 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.