D-503 - The novel's protagonist, whose narrative is written in response to a call for literary works to send to distant planets aboard the Integral, the spacecraft he has designed and whose construction he oversees.
I-330 - A character with white, sharp teeth and a face that forms an irritating X. This character smokes and drinks alcohol in front of the narrator.
O-90 - A round, childlike character who is impregnated illegally.
R-13 - The narrator's best friend, a poet with "Negroid" lips who spits when he talks.
S-4711 - A hunchbacked, mysterious character who follows the narrator around and is described as having wing-like ears.
U- - A woman with gill-like cheeks who is the controller in the narrator's building.
The Second Builder - This character assists the narrator at work, and ends up knocking him unconscious during a mutiny attempt.
Taylor - The revered founder...
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