Morrigan leaves her home to accompany the protagonist of Origins, the would-be Hero of Ferelden, at the request of her mother Flemeth to stop the monstrous Darkspawn from overrunning the world of Thedas.

Morrigan is quick to show her amoral worldview; she disapproves of actions that benefit people she perceives as worthless and/or which do not further the Warden's personal cause, such as helping a beggar or settling a dispute in Lothering.

[2] While she is not a playable companion in Inquisition, she is a major participant in the continuation of a lengthy plotline which began about midway through Origins, which would culminate in a milestone moment for the character.

Gaider decided to cast Black as the voice of Morrigan as he was familiar with her work as Aeryn Sun in the science fiction television series Farscape.

[11] The design of her dress "slyly layers the natural upon the ostentatious", and is a "cavalier, twitchy thumb to the nose of the pastel hues favoured by Orlesian fashion".

[12] Morrigan first appears to confront the Grey Wardens when they were searching for their old treaties with the nations of Thedas in the Korcari Wilds, and revealed that they have been taken by her mother Flemeth for safekeeping.

In addition to Origins, Morrigan appears in the game's DLC Witch Hunt, which explores her whereabouts following the end of the Blight and is presented as the conclusion of her storyline.

The player character tracks Morrigan down one year after the Blight's end, finding her activating an Eluvian that will transport her to an unknown location and claiming that Flemeth is still alive regardless of the previous course of action taken in dealing with her.

Morrigan also appears in the game's Darkspawn Chronicles DLC, an alternate retelling of Origin's events where the player character dies at the start and Alistair is left in charge of Ferelden.

Morrigan plays a significant role in the plot of Dragon Age: Inquisition, where she has managed to secure herself the position of arcane adviser to Empress Celene of Orlais.

Depending on the decision made by the Warden in Origins, she may appear with her son Kieran, who either possesses an Old God soul if the ritual was performed or is a normal child if the Hero of Ferelden slept with Morrigan but did not go through with her plan.

Morrigan proves invaluable during the Inquisition's mission to thwart the Elder One from reaching the Well of Sorrows, an ancient magical pool that contains the knowledge of the elven people.

Morrigan appears in a short prequel web comic set also titled Dragon Age: Origins by the Penny Arcade artists, released on September 4, 2009.

[6] GamesRadar's Jordan Baughman identified Morrigan as an example of "The Recalcitrant Shrew", a minimally dressed and needlessly combative female companion character archetype found in other BioWare titles.

[21] Tom Senior thought of Morrigan as cool and mysterious, and that she is in an interesting place on the morality scale who employs dark methods for heroic reasons.

[3] In his review of Dragon Age: Origins, Dave Snider of Giant Bomb noted that while the game features superb voice acting all around, Claudia Black's performance as Morrigan stole the show.

[22] GameRevolution regarded her as "one of the most brilliant creations to come out of the Dragon Age series since it began in 2009", with Black's performance being praised for adding "an elegant touch to her crass cynical demeanor and the mystery of her motivations".

[16] On the other hand, Kieron Gillen, also from Rock Paper Shotgun said that he could not stand Morrigan, although he claimed to have a clear mental image of her and her personality "burned" into his mind.

[19] Alec Meer from Rock Paper Shotgun was similarly amused by her constant bickering with Alistair; he commented that Morrigan "seemed a textbook line in sneery, sultry know-it-alls", though he is certain there are "many more stings to be found in her self-confident tale".

[24] Oli Welsh, writing for Eurogamer, called Alistair and Morrigan the "stars" amongst the companions of Origins, but criticized their storylines as being "contrived", and the dialogue "wooden".