Between the parents of the Kousaka family, Yoshino is the one with a more passive approach to parenthood. She is often in a positive mood and can be seen joking around with her children, particularly Kyousuke. She is aware of many things going on in her family, particularly Kyousuke's stash of porn magazines and Kirino's hobby, and helps keep the peace in the house. Despite this, she keeps Kirino's secret to everyone, although she uses Kyousuke's "interests" to her advantage at times.