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The Portal storyline is home to a number of richly detailed characters.
By order of appearence:
Chell
Chell is the primary protagonist. She is a mute but determined woman, and serves as the player's interface.
GLaDOS
GLaDOS (or Genetic Lifeform and Disk Operating System) is the primary antagonist. She is the computer system that oversees Aperture Science.
Doug Rattmann
Doug Rattmann is an ex-Aperture Science employee.
Companion Cube
The Companion Cube is a variant of the Weighted Storage Cube. It plays a vital role in the testing process.
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 in the Portal 2 Co-op, and is the short, nervous masculine side of the two.
P-body
P-body is the orange avatar in the Portal 2 Co-op, and is the confident, feminine side of the two.