Characters

The Portal storyline is home to a number of richly detailed characters.

Characters
 In order of appearance :

Chell
Chell is the protagonist and the character in which you control in both Portal and Portal 2 during the single player portions. She is notoriously tenacious, renowned for a "never give up", "never say die" attitude as highlighted in the Portal: Lab Rat comic. Throughout both games, she doesn't speak, and interacts silently with the world around her.

GLaDOS
GLaDOS (or Genetic Lifeform and Disk Operating System) is the primary antagonist throughout both Portal and Portal 2. She is a sentient computer that was built to help control, and later fully control all aspects of the Aperture Science Enrichment Center. Witty and sarcastic, her tone and mode of speech is generally surprisingly human, but with the cold calculating precision only a computer can afford.

Doug Rattmann
Doug Rattmann is an ex-Aperture Science employee.

Weighted Companion Cube
The Weighted Companion Cube is a variant of the Weighted Storage Cube. It is presented to the player in a late test chamber in Portal, and serves as both protector and assistant throughout the level. In the sequel, the Companion Cube has been upgraded, like much of Aperture Science equipment has, it's most notable of which is a soft music playing when held.

Wheatley
Wheatley is a sentient personality core that has helped to maintain Aperture Science. He begins Portal 2 as your companion and guide through the early parts of the game, attempting to help the player escape from GLaDOS.

Cave Johnson
Cave Johnson, who began is career as a successful shower curtain salesman, decides to begin a venture into science, founds and develops Aperture Science Innovations, a testing ground for inventions of a scientific nature. Now presumed deceased, recordings of his voice guiding test subjects through chambers can be found throughout Aperture Science.

Caroline
Caroline was Cave Johnson's assistant.

Atlas
Atlas is a sentient robot designed by GLaDOS from the remains of a knowledge core for the purposes of cooperative testing with his partner P-Body. His eye, and markings on his body are blue, while he fires blue and purple Portals from his Aperture Science Handheld Portal Device. Though incapable of human speech, he is presented as a somewhat nervous masculine robot.

P-body
P-Body is a sentient robot designed by GLaDOS from the remains of a turret for the purposes of cooperative testing with his partner Atlas. "Her" eye, and markings on her body are orange, while she fires orange and red Portals from his Aperture Science Handheld Portal Device.Though incapable of human speech, P-Body is presented as inquisitive and confident, though slightly feminine robot.