|Японское имя:||不知火 袴|
Blood Type: AB
Hakama Shiranui is the chairman of Hakoniwa Academy and the former coordinator of the Flask Plan. He is the grandfather of Hansode Shiranui. He is one of the central antagonists of the series, being responsible for much of the conflict Medaka Kurokami faces during her time as Student Council president.
Hakama is usually quite congenial, as he jokes around with Abnormals and always tries to keep a smile on his face. Behind the smile though, is a smart, ruthless mindset that has allowed Hakama to successfully run the Flask Plan for years. Even after being attacked by Misogi Kumagawa, Hakama remains focused on pursuing his own ends, and decides to let Kumagawa run wild to keep Medaka occupied. When he's near his granddaughter, he becomes more bonhomie and treats her like a child (despite her being a high school student), but he still recognizes her intelligence and listens to her advice.
Voiced by: Motomu Kiyokawa