There is 8 unique codex entry in the Persons of Note section on Korriban. The are all class specific.
Darth Baras (Warrior) is obtained from speaking with Darth Baras during "A New Master" mission.
Codex type: Persons of Note | Faction: Imperial | Class: Sith Warrior
Associated Achievement: None
Darth Zhorrid (Agent) is obtained from speaking with Darth Zhorrid during "Darth Zhorrid Arrives" mission.
Codex type: Persons of Note | Faction: Imperial | Class: Imperial Agent
Associated Achievement: None
Khem Val (Inquisitor) is obtained from speaking with Lord Zash during "A Map for the Future" mission. It is obtained with the Apprentice codex.
Codex type: Persons of Note | Faction: Imperial | Class: Sith Inquisitor
Associated Achievement: None
Lord Zash (Inquisitor) is obtained from speaking with Lord Zash during "The Secret of Tulak Hord" mission.
Codex type: Persons of Note | Faction: Imperial | Class: Sith Inquisitor
Associated Achievement: None
Overseer Harkun (Inquisitor) is obtained from speaking with Overseer Harkun during "Of Mind and Matter" mission.
Codex type: Persons of Note | Faction: Imperial | Class: Sith Inquisitor
Associated Achievement: None
Overseer Tremel (Warrior) is obtained from speaking with Overseer Tremel during "Arm Yourself" mission. It is obtained with the Acolyte codex.
Codex type: Persons of Note | Faction: Imperial | Class: Sith Warrior
Associated Achievement: None
Vette (Warrior) is obtained from speaking with Vette during "The Final Trial" mission.
Codex type: Persons of Note | Faction: Imperial | Class: Sith Warrior
Associated Achievement: None
Xalek (Inquisitor) is obtained from speaking with Overseer Harkun during "Testing" mission.
Codex type: Persons of Note | Faction: Imperial | Class: Sith Inquisitor
Associated Achievement: None