We characters

Appears from the start

The chief engineer of the Integral, a spacecraft the One State plans to send to other worlds. D-503 is a mathematician and loyal citizen who begins a record of the project for the people the ship is meant to convert. He takes pride in glass walls, regulated hours, and the replacement of private choice by exact collective order.

Appears from the start

A registered partner of D-503 under the One State's system of scheduled sexual visits. O-90 is shorter and more emotionally open than the official ideal, and her wish for affection and a child sits uneasily beside rules that measure who may become a parent.

Appears from the start

A state poet and friend of D-503 who writes verse in praise of the One State. R-13 shares scheduled visits with O-90 and accepts the regulated arrangement with outward good humor, while his art serves public ceremonies rather than private expression.

First appears in chapter 2

A self-possessed woman D-503 meets while walking with O-90. I-330 asks unsettling questions, smokes, drinks alcohol, and treats the One State's rules with an irony he cannot classify. Her sharp features and unpredictable invitations disturb his faith in a life governed by straight lines.

First appears in chapter 6

An elderly custodian at the Ancient House, a preserved building from before the One State. She receives visitors amid opaque rooms, old furniture, and private objects that contradict the city's transparent, standardized life.

First appears in chapter 9

A doctor whom D-503 consults when dreams and irrational feelings begin disrupting his regulated life. Connected to I-330, he recognizes that D is developing an inner self the One State treats as an illness and provides official notes that can conceal unauthorized activity.

First appears in chapter 9

A bent, watchful member of the Bureau of Guardians who repeatedly appears near D-503 and I-330. Whether he is protecting the State, following a suspect, or arranging a trap is initially unclear, and his presence makes D conscious of surveillance even in a city built for visibility.

First appears in chapter 13

A strict older woman assigned to supervise D-503's building. U admires official discipline, monitors the citizens around her, and takes a proprietary interest in D's welfare as his behavior becomes less regular.

First appears in chapter 25

The ruler annually acclaimed by the citizens of the One State. The Benefactor presides over public justice and embodies a political order that defines freedom as disorder and coercive happiness as a mathematical good.