The ninth season of The Blacklist has already been renewed, earlier than planned, due to its skyrocketing popularity with viewers in its eighth season. According to Digital Spy, it’s reported that Harold Cooper will return, along with Red (James Spader), Liz Keen (Megan Boone), Donald Ressler (Diego Klattenhoff), Dembe Zuma (Hisham Tawfiq), Alina Park (Laura Sohn), and Aram Mojtabai (Amir Arison).
However, there’s no confirmation directly from NBC or The Blacklist’s production as to who exactly will be in the cast for the ninth season, so we can’t confirm that Harold Cooper is definitely coming back, although all signs point to yes.
Source : https://www.distractify.com/p/is-harold-cooper-leaving-blacklist