List of Borg drones assigned to Locutus' cube.
Drones 1 []
These drones were assigned to the Borg cube which entered Federation space in 2366 and destroyed several colonies including the one on Jouret IV.
Three of these drones beamed aboard the Enterprise-D and abducted Captain Picard, assimilated him and created Locutus of Borg.
Later, all nine drones tried to stop an away team from the Enterprise-D led by Lieutenant Commander Elizabeth Shelby when they've damaged the power distribution nodes. (TNG: "The Best of Both Worlds")
Drones 2 []
These drones were assigned to the Borg cube which headed to Sector 001 following the disaster at Wolf 359. They served as guards for Locutus of Borg and one of them performed medical surgeries on Locutus. Later they tried to stop the away team from the Enterprise-D, including Shelby, Worf, and Gleason in kidnapping Locutus. They were all destroyed when the cube exploded. (TNG: "The Best of Both Worlds, Part II")
Drones 3 []
USS Saratoga viewscreen
The drones were seen on the viewscreen of the USS Saratoga when Jean-Luc Picard, after his assimilation, proclaimed himself to be Locutus of Borg. (DS9: "Emissary")