Hiroki Dan

A highly ranked police investigator and a serial killer, Dan is part of the Investigation Division Unit 1 and the son of a former police superintendent General, Takashi Dan.

He is very tall and broadly built, has blue eyes and medium-length black hair, which he always wears neatly combed. Due to his high position, he always pays attention to his appearance, so he accordingly wears most of the time suits.

(Source: Fandom Wikia)