

Erik Wolpaw added that Wheatley served as an "offset" of GLaDOS while her voice is "slower-speaking and more deliberate", Wheatley is a "frantic person", which Erik says is performed well by Merchant due to being able to relay information quickly in his speech. Wheatley was designed with the purpose of making a character who "you’d be seeing a lot". The idea was removed as it supposedly made the game feel too cluttered and the player never got to really learn about the multiple robots, so several were combined into the character of Wheatley. Wheatley came from combining several ideas from multiple "personality cores" that the player would meet throughout the game. Wheatley was first revealed in an ARG released by Valve, the developer of the Portal series, in a screenshot of Portal 2 before its release, showing the player-character Chell holding him. Wheatley has also been described as a contrast to GLaDOS's "slower-speaking and more deliberate" personality.

Merchant has been praised for his portrayal by critics who cited his fast-talking dialogue. Since his appearance in Portal 2, Wheatley has received overwhelmingly positive reception from critics. He also appears in Rocket League as an antenna that can be equipped to the car of the player's choice. In addition to Portal 2, Wheatley has appeared in Team Fortress 2 and Lego Dimensions. Initially serving as a comedic foil to the player-character Chell during the first half of Portal 2, Wheatley becomes the main antagonist of the second half as he takes GLaDOS's place and wreaks havoc on the facility before Chell and GLaDOS (whose consciousness is now trapped inside a potato battery) stop him. In the Portal narrative, Wheatley is one of several spherical "personality cores" developed to restrain GLaDOS, the main artificial intelligence that operates the Aperture Science facility, from becoming rampant, though Wheatley is later revealed to have been built to act as an intelligence dampener towards GLaDOS. He is voiced by British comedian and writer Stephen Merchant, and created in part by Portal 2 's designer Erik Wolpaw.

Wheatley is a fictional artificial intelligence from the Portal franchise first introduced in the 2011 video game Portal 2.
