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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 an accompanying character in Portal 2. An eccentric and excitable Personality Core, he aims to help Chell escape the facility.
Cave Johnson
Cave Johnson is the deceased founder of Aperture Science.
Caroline
Caroline was Cave Johnson's assistant. At the time of Cave's death, her consciousness was transferred into the core system to become GLaDOS.
Atlas
Atlas is the blue avatar robot in the Portal 2 Co-op, and is the short, nervous masculine side of the two.
P-body
P-body is the orange avatar robot in the Portal 2 Co-op, and is the confident, feminine side of the two.