She's the wife of Shuichi Aizawa and mother of their daughter Yumi. Not much is known about her character—she only shows up briefly in the series, first appearing in episode eighteen when Aizawa comes home with a bruise, having gotten into a fight with her. At the time, Yumi was still very young and he was barely around due to overwork.
Later that same episode, she and Yumi spot him sitting alone on a park bench. She asks if he'll be home for dinner, mentioning she'd only prepared food for herself and their daughter. When Aizawa breaks down crying, Yumi turns to her mother confused about why he's so upset.
According to Death Note: How to Read 13, she and Yumi are typically unhappy because of how much Aizawa works. It's a pretty bleak picture of their family life, honestly—she comes across as tired and resigned to his constant absence.
Content compiled by AnimeList.moe from publicly available sources.
