Haru Kirishima is Bossun and Sasuke's biological mother in the Sket Dance franchise.
Haru is Ryosuke's childhood friend at Sunny Garden orphanage. The reason is that her parents were dead when she was 2. She meets Akane Fujisaki during high school. After high school, she and Ryosuke married. On the day of Bossun's birth, she and Akane drive to the hospital. Sadly, she dies in a car accident. At the same time, Ryosuke dies in a separate car accident while he tries to get to the hospital.
Haru Kirishima is created by Kenta Shinohara, and she has no information regarding any inspiration used to create her. She first appears in Sket Dance chapter 81 of volume 10 and episode 46. Her Seiyuu is Masumi Asano.
She has long black hair that flows past her nape and brown eyes. Her looks are inherited by Sasuke Tsubaki who has her long eyelashes.
Even though there's not much information on her, it's assumed that she has a sweet and gentle personality when she greets Ryosuke and hugs a stray cat.
She appears in Bossun and Akane's flashbacks. (See origin)