R. Dorothy Wayneright is the android assistant of Roger Smith in the series.
Introduced in Act:01 as Dorothy Soldano, daughter of rich scientist Miguel Soldano, she is later revealed to be an android constructed by him. Her actual "father" would be Timothy Wayneright, the man who commissioned her construction and father of the real and presumably deceased Dorothy Wayneright. To show her gratitude, and as a form of payment for Roger's help, she decides to move in with him and help out Norman with the chores. In occasional episodes, Dorothy accompanies Roger in his work as a negotiator.
Dorothy stands just under 5 feet (150 cm) tall, has red hair, chalk-white skin and much more body weight than her slender appearance reveals. Her forehead houses an illuminated CD ROM drive, which is loaded from a drawer made to resemble a hair ribbon. While capable of normal human facial expression, in film noir tradition she typically maintains a pouty contour and a mildly sarcastic personality, described by Angel as being "perpetually foul-tempered". Her dry wit is best reflected by her catchphrase "You're a louse, Roger Smith," her teasing response to Roger's sometimes unreasonable demands. She and Roger maintain playful retorts throughout the series, with Dorothy often going out of her way to irritate Roger or otherwise rattle his cage. Regardless, she has shown hints of romantic feelings towards Smith. Offsetting her straightforward attitude is her general likability; she gets along rather well with virtually everyone, even those towards whom she harbors suspicion. From her conversation and behaviour, it is evident that Dorothy has the capacity for human emotions. She has shown genuine fear on a number of occasions, and reveals jealousy toward Angel's relationship with Roger and satisfaction from its failure to become romantic.
Dorothy is quite durable and much stronger than any human, able to punch down a brick wall with one blow or leap several dozen feet into the air. She has amazing balance, as seen during her moments of contemplation while standing precariously on the edge of Roger's balcony. R. Dorothy can run or bicycle at superhuman speed and does not require oxygen to operate. She shows superhuman coordination, performing effortless gymnastics and, is able to steer a car with her foot while riding on its hood. That she takes regular meals with Roger indicates she can consume food and beverages, although she admits in episode 11 "Daemonseed" not being able to taste. Dorothy also seems to have an unexplained connection to Big O itself. In Acts 20 and 21, when Dorothy is nearly destroyed by Alan Gabriel, Big O apparently senses this and shuts down in order to facilitate her rescue by Roger. In the final Act, she activates Big O's Final Stage weapon by plugging herself directly into the megadeus. She shows self-awareness and capacity for learning; throughout the series she exhibits talents at performance singing and virtuoso piano. It's suggested that the show's closing song is in fact R. Dorothy performing with a male vocalist, who may or may not be Roger.