Maguro Kurokami

He is a former student of Class 13 and a former member of the Flask Plan's Thirteen Party. He is currently the manager of Ghost Babel, Hakoniwa Academy's old school building. He is the eldest child of Kajiki Kurokami, and the older brother of Kujira Kurokami and Medaka Kurokami. He has a huge sister complex.

Ten years later, Maguro has rejoined the Kurokami Group as an analyst.
(Source: Medaka Box Wika)