55 characters, locations, and items in this world codex.

Characters

Bill Hines — English neuroscientist, EU President, Third Wallfacer — collaborates with his wife Keiko on the Mental Seal, never realizing it is the lever for the m
Chang Weisi — PLA general and architect of the Chinese Space Force in the early Crisis — the man who gives Shi Qiang his nickname and Zhang Beihai his career.
Chu Yan — Captain of Blue Space, sole survivor of the Battle of Darkness — the man who orders his crew into vacuum suits because he has thought the dark forest
Ding Yi — Theoretical physicist and Yang Dong's grieving lover — chosen to lead first contact with the droplet at the Doomsday Battle.
Dongfang Yanxu — Captain of the flagship Natural Selection, born in space — the first commander to have her ship stolen out from under her by a hibernated commissar sh
Fraisse — Aboriginal Australian elder placed into hibernation in the Common Era to preserve his cultural knowledge — a mind from before the Crisis whose calm be
Frederick Tyler — Former US Secretary of Defense, First Wallfacer — author of The Truth of Technology, planning a kamikaze swarm fleet whose true purpose is to betray E
Ivan Antonov — Hibernated Russian vice-admiral — youngest of the candidates considered to inherit Luo Ji's Swordholder seat at the end of the Deterrence transition.
Keiko Yamasuki — Japanese neuroscientist, Bill Hines's wife and lifelong research partner — secretly the Third Wallbreaker, who finally exposes the Mental Seal's true
Lei Zhicheng — Long-dead Red Coast political commissar woken in the post-Crisis era as a hibernated cameo — a relic of the Cultural Revolution wandering a future tha
Listener 1379 — The Trisolaran monitoring-station operator who answered Ye Wenjie's transmission with a warning: do not answer, do not answer, do not answer.
Luo Ji — Cynical astronomy lecturer turned fourth Wallfacer — alone given the axioms of cosmic sociology by Ye Wenjie, alone able to cast the spell that proves
Manuel Rey Diaz — Former President of Venezuela, Second Wallfacer — guerrilla strategist whose stellar-grade hydrogen bomb plan is, in truth, a doomsday machine to drop
Shi Qiang — Veteran Beijing detective assigned to keep Luo Ji alive against ETO, hibernation, and Luo Ji himself — the only person in the Wallfacer apparatus who
Sophon — Sentient proton, the Trisolarans' ear and eye on Earth — present throughout Book 2 as an invisible surveillance god, with the humanoid robot avatar st
The First Wallbreaker — ETO operative codenamed 'Von Neumann' inside the Three Body game — assigned by the Trisolarans to dismantle Frederick Tyler's mosquito-swarm scheme.
The Princeps — The supreme leader of Trisolaris during the Crisis Era — the voice that orders the suppression of Listener 1379's warning and the launch of the invasi
The Second Wallbreaker — ETO operative codenamed 'Mozi' — a young man who unmasks Manuel Rey Diaz's Mercury plan in front of the world and triggers the lynching that follows.
The Third Wallbreaker — Bill Hines's own wife Keiko Yamasuki, revealed in the same press conference as her wallbreaking — the only Wallbreaker the Trisolarans embedded by mar
Wang Miao — Nanotechnology researcher and reluctant Three Body player from Book 1 — a peripheral figure in The Dark Forest, named in passing as the Crisis Era ope
Xia Xia — Luo Ji and Zhuang Yan's infant daughter — the second hostage hibernation gives the future, and the reason Luo Ji finally stops drinking.
Yang Dong — Brilliant string theorist whose suicide opens the Crisis Era — Ding Yi's lover, Ye Wenjie's daughter, the woman whose grave is where cosmic sociology
Ye Wenjie — The astrophysicist who answered the Trisolarans, founded the ETO, and on a winter morning at her daughter's grave passed the two axioms of cosmic soci
Zhang Beihai — PLA Navy political commissar turned Space Force officer — a perfect performance of orthodox confidence concealing the most lucid defeatist in the flee
Zhuang Yan — Art student located by Da Shi to match Luo Ji's invented dream woman — innocent, devout, unaware she was sought, and the only thing in the world Luo J

Locations

Beijing — Capital of China in the early Crisis Era — Luo Ji's original home, Yang Dong's grave, Da Shi's beat, and the city the Wallfacer apparatus drags him ou
Blue Space — Asian Fleet stellar-class warship — Chu Yan's command, the only ship to survive both the Doomsday Battle's aftermath and the Battle of Darkness.
Earth — The home planet under sophon surveillance — and, by Book 2's end, a star whose coordinates are known to anything with a radio telescope.
Hibernation Centers — Government-run cryosleep facilities of the early Crisis Era — the only legal way to skip a century and meet the future Trisolaran fleet awake.
Listening Post 1379 — A remote Trisolaran monitoring station — staffed by a single duty officer for life, where the warning back to Earth was sent and then erased.
Luo Ji's Lakeside Villa — A walled estate in Northern Europe requisitioned for Luo Ji as part of his Wallfacer privileges — a private Eden built around a lake, a vineyard, and
Natural Selection — Stellar-class flagship of the Asian Fleet's 3rd Squadron, fifteen hundred meters long — stolen by Zhang Beihai out of the Doomsday Battle and turned i
New York City — Pre-Crisis Manhattan as host city for the Wallfacer Project — recognizable, ordinary, with the East River carrying the same ferries as ever.
Pendulum Monument — A skyscraper-scale pendulum erected outside the UN — a permanent reminder of the Trisolaran civilizations' attempt to predict their suns by sympatheti
The Combined Fleet Position — The volume of space between Jupiter and Saturn where humanity assembled two thousand stellar-class warships to greet a single droplet — and where they
The Solar System — The eight planets and their moons under sophon surveillance — humanity's prepared battlefield for an invasion four hundred years out.
Trisolaris — The Trisolaran homeworld in Alpha Centauri — a planet that survives by dehydrating, learning, and deciding to leave.
United Nations Headquarters — The Manhattan complex where the Wallfacer Act passes, the Wallbreakers reveal each Wallfacer's plan, and Keiko Yamasuki dies in the meditation room.
Zhaoge — The pyramid-capital of Trisolaris where the Princeps holds court and Listener 1379's warning was suppressed — a city of giant pendulums trying to cloc

Items

187J3X1 — An unremarkable star fifty light-years from Earth — the first one Luo Ji named in his broadcast and the first one the dark forest answered.
Earth-Trisolaris Organization — Founded by Ye Wenjie and Mike Evans in Book 1 — by Book 2 a fragmented but lethal underground that supplies every Wallbreaker and tries repeatedly to
Fleet International — The unified Solar Fleet of the late Crisis Era — Asian, North American, European fleets pooled under joint command, two thousand warships, one droplet
Hibernation Technology — Long-duration cryosleep developed in the early Crisis — the practical bridge that lets twenty-first-century minds wake up alongside the Trisolaran fle
Mosquito-Swarm Fighter — Frederick Tyler's nuclear-pulse-driven kamikaze fighter craft — a swarm doctrine designed to overwhelm the Trisolaran fleet, secretly engineered to fe
Stellar-class Warship — The standard human capital ship of the late Crisis — fifteen hundred meters of fusion-driven steel, gamma-ray lasers and railguns, two thousand built,
The Battle of Darkness — The murder of four ships by one — the moment Starship Earth's five surviving captains independently realize that the dark forest applies to them too.
The Crisis Era — The four-hundred-year period between the Trisolaran fleet's launch and its arrival — humanity's window to prepare, panic, hibernate, and finally produ
The Dark Forest Theory — The two-axiom proof that the universe is a forest of armed hunters, every civilization a candle, every visible candle a target.
The Doomsday Battle — Year 205 Crisis Era: two thousand human warships meet one Trisolaran droplet between Jupiter and Saturn, and lose in fifteen minutes.
The Droplet — Strong Interaction Probe — a three-meter mirror-bright teardrop that ate two thousand warships in fifteen minutes and now hangs in geosynchronous orbi
The Great Ravine — The mid-Crisis-Era population collapse — a multi-decade depression of starvation, war and despair when the war economy outran the planet's biosphere.
The Mental Seal — Bill Hines's neural imprinter, marketed as a confidence-builder for the Space Force — secretly substituted by Keiko Yamasuki to imprint defeatism at t
The Spell — Luo Ji's broadcast: a string of star coordinates fired at the Sun and amplified to the galaxy — proven by the destruction of 187J3X1 to be a death sen
The Trisolarans — The species inbound on Earth — beings of light-speech who cannot lie, will not stop, and have a single droplet's worth of patience for a species that
The Wallfacer Project — Year-3-Crisis-Era UN program that grants four people unlimited resources, total privacy of intent, and the right to lie to the entire human species.

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