What is the name of the blue robot in Portal 2’s cooperative mode? The blue robot is Atlas, officially styled as ATLAS.
ATLAS is one of the two playable robots in Portal 2’s cooperative campaign. GLaDOS generally refers to him as “Blue,” while the other robot, P-body, is called “Orange.” Their different colors make it possible for players to distinguish the two characters during cooperative testing.
The robots were designed for a campaign in which teamwork is essential: players must place portals, activate switches, redirect lasers, and coordinate timing. Unlike a human test subject, ATLAS and P-body can be destroyed and recreated repeatedly, fitting GLaDOS’s view of them as endlessly reusable test equipment.
A common mix-up is to answer P-body, because both robots appear together and P-body is also a major cooperative character. Wheatley and GLaDOS are important Portal characters, but neither is the blue cooperative robot. ATLAS and P-body were originally conceived as human test subjects before Valve changed the design to robots that could respawn without disrupting the campaign.