Disgust is highly opinionated, extremely honest, and prevents Riley from getting poisoned — both physically and socially. She keeps a careful eye on the people, places, and things that Riley comes into contact with — whether that's broccoli or last year's fashion trend. Disgust always has the best of intentions and refuses to lower her standards.
Disgust is one of the five emotions controlling Riley's mind and helping her. She is first seen when Bill Andersen starts to feed broccoli to his daughter. Disgust is the fourth emotion to be introduced.
When their leader, Joy and another emotion, Sadness, literally gets lost in Riley's mind, she and the other emotions have to keep Riley's head on straight until Joy and Sadness get home. However, things go wrong sooner or later, they even decide to make Riley run away, even though Fear tells them how wrong that idea is. She belittles Sadness to a neutral degree due to her superficial teen attitude.
When Joy and Sadness reach headquarters, Anger tries to break the glass with a chair, but to no avail. Getting an idea, Disgust gets Anger to ignite his fire, and then, after putting on a welding mask, she uses him as a blowtorch to burn a hole in the glass for Joy and Sadness to climb through.
Disgust begs Joy to stop Riley and fix the problem but is shocked when Joy lets Sadness take control of Riley instead. Disgust is worried at first but is amazed when Sadness is able to pull the idea out of the console. Disgust, along with Anger and Fear, continue to watch in awe as Riley returns home where Sadness helps her admit to her parents that she misses Minnesota and how she hates the changes in living in San Francisco. As Riley's parents comfort her, Disgust, Anger, and Fear are moved by the scene as they watch Joy give Sadness the blue core memory (which she recovered from the Memory Dump) back and Sadness has Joy make Riley happy as she's being comforted by her parents. Their teamwork creates a new core memory consisting of the colors of both blue and yellow, creating a new Family Island, leaving Disgust, Anger, and Fear even more astounded.
According to Pete Docter, her appearance is based on that of broccoli, which, ironically, is what she, Riley, and the other emotions hate while Pete Docter himself, loves.
As shown in concept art, as well as in the first clips shown at the 2013D23 Expo, Disgust was first designed with a purple dress, had longer hair, and did not wear lipstick or have long eyelashes. Interestingly, while Riley's Disgust ended up having a green dress in the final film, Riley's mom's Disgust has retained a purple dress.
Before this, Disgust was supposed to look ugly. This was changed most likely to show that Disgust represents being disgusted instead of being disgusting.
In one of the first concept drawings, Disgust was, in the planning stages, portrayed as a male character during production, but was later switched to a female character.
Disgust's belt buckle is shaped like a capital "D" to represent the first letter in her name.
Disgust is the dominant Emotion of the Yeast of Eden Server.
Disgust has no involvement with Bing Bong, nor does she mention him.
Disgust has no emotion who is her polar opposite, unlike Joy & Sadness and Anger & Fear.
During a stage where the Emotions all had human names, Disgust was going to be called Nadia or Gretchen.