Cipher Pol “Aigis” Zero or CP0 for short, is the strongest intelligence organization among Cipher Pol, working directly under the World Nobles. CP0 is the strongest of all Cipher Pol units, even surpassing the assassination specialists of CP9.
Much is unknown about the agents and their abilities; however, the members of the group are shown to be masters of Rokushiki and are proficient in Haki as Lucci, Kaku, Stussy, Blueno and Kalifa learned Busoshoku and Kenbunshoku Haki.
The agents who wear masks are among the most elite fighters of CP0, stated to be in a class of their own. A masked member of CP0 is easily capable of defeating even an Ancient Giant. In One Piece SBS Volume 104 Oda reveals the names of the masked CP0 Agents.
Note: Fans previously incorrectly assumed that Guernica was the agent on the right with the yellow beard, but this SBS clarifies it was actually the agent on the left. Considering that it was stated Agent Guernica is the one who took the picture of Nika Luffyshown in his bounty poster, this would imply that Guernica survived the attack from Kaido.