Characters and terminology index

Hououin Kyouma · Okabe

Founder of the Future Gadget Laboratory, self-proclaimed “Hououin Kyouma.” He retains memories across world lines and calls this phenomenon Reading Steiner.

• Dr. Nakabachi’s Time-Machine Presentation
• The First D-Mail Rewrites the World Line
• Mayuri's Death Is a Convergent Outcome
• Kurisu Confronts the Cost of the Alpha World Line
• Delete the Original Record and Return to Beta

Kurisu · Christina

A neuroscience researcher at Viktor Chondria University and a central figure in both time-machine theory and the Time Leap Machine.

• Dr. Nakabachi’s Time-Machine Presentation
• Mayuri's Death Is a Convergent Outcome
• Kurisu Confronts the Cost of the Alpha World Line
• Delete the Original Record and Return to Beta
• The First Attempt to Save Kurisu Fails

Mayuri · Mayushii

Okabe’s childhood friend and a lab member. Her death is the central convergence outcome in the α Attractor Field.

• Dr. Nakabachi’s Time-Machine Presentation
• Mayuri's Death Is a Convergent Outcome
• Delete the Original Record and Return to Beta
• Arc-light at the Infinity
• Arrive on the Steins Gate World Line

Daru · Hashida

Okabe’s friend and a lab member with exceptional programming and hardware skills. He is also a key developer of the future time machine.

• The First D-Mail Rewrites the World Line
• Delete the Original Record and Return to Beta
• The Gel-Banana and PhoneWave Experiment
• Kurisu Joins the Future Gadget Laboratory
• Decoding SERN's Jellyman's Report

Suzuha · Suzu Hashida

A time traveler who reaches 2010 from the future and lives in the past as “Suzu Hashida” in Braunian Motion of Love and Hate. Her mission, experiences, and the condition of her time machine differ between Attractor Fields.

• The First Attempt to Save Kurisu Fails
• Arc-light at the Infinity
• Execute Operation Skuld
• The John Titor Thread Appears
• The D-Mail That Stops Suzuha from Leaving

Maho

Kurisu’s senior colleague at Viktor Chondria University and an important researcher on the Amadeus system.

• Okabe Interacts with Amadeus Kurisu
• Maho Hiyajo and Alexis Leskinen Present an Artificial-Intelligence Lecture
• Okabe Becomes an Amadeus Tester
• The Lab Holds a Christmas Party
• An Armed Group Attacks the New Year Gathering

Shoichi Makise · Doctor Nakabachi · Nakabachi

Kurisu’s father. On the main game’s β World Line he attempts to steal his daughter’s time-machine thesis and takes it to Russia, becoming a catalyst for World War III.

• Dr. Nakabachi’s Time-Machine Presentation
• Okabe Follows the Scream and Finds Kurisu Collapsed
• Kurisu Explains How She Became Estranged from Her Father
• Suzuha Uses C204 to Explain World War III
• Kurisu and Dr. Nakabachi Fight over the Time-Machine Paper

ジョン・タイター · Titor · 約翰·提托 · John Titor identity

An identity that publishes information online about time travel, world lines, and SERN’s future. The year in which it appears and its connection to Suzuha differ between Attractor Fields.

• The John Titor Thread Appears
• Itaru Hashida Breaks into a SERN Server
• Suzuha Reveals That She Is John Titor

Moeka · Shining Finger

Lab Member No. 005, who depends heavily on text communication and searches for the IBN 5100. Her ties to FB and the Rounders are central to the attack on the lab in the α Attractor Field.

• Moeka Sends the D-Mail to Find the IBN 5100
• The Rounders Raid the Lab and Mayuri Dies for the First Time
• The Truth about Moeka and FB Is Revealed
• Send a D-Mail from FB's Phone to Cancel Moeka's Action
• Okabe Is a Rounder on the Gamma World Line

Luka · Lukako · るか

Lab Member No. 006 and the son of Yanabayashi Shrine’s head priest. Luka’s D-Mail and the Fractal Androgynous ending form a major branch of the main game.

• Luka Sends a D-Mail to Change Sex at Birth
• Okabe Goes on a Date with the Female Luka
• Link of Corruption and Rebirth
• Send the D-Mail That Undoes Luka's Wish
• Luka Brings the Amnesiac Kagari Shiina to the Lab

Faris · Faris Nyannyan · Rumiho Akiha · フェイリス・ニャンニャン

Lab Member No. 007, whose real name is Rumiho Akiha. The D-Mail she sends to save her father also changes Akihabara’s culture and can lead to the Ω World Line.

• Faris Sends a D-Mail That Saves Her Father
• Faris Reveals the Exchange between Her Father's Death and the IBN 5100
• Isolated Jamais Vu
• Send the D-Mail That Undoes Faris's Wish
• Faris Shares a Recording About Their Fathers

Kagari · かがり

Mayuri’s adopted daughter in the future. She disappears after traveling to the past with Suzuha as a child; her memories, conditioning, and identity are revealed differently across STEINS;GATE 0 routes.

• Luka Brings the Amnesiac Kagari Shiina to the Lab
• The Group Traces the Song in Kagari’s Memory
• Recursive Mother Goose
• Daru Pursues Kagari Shiina in 2036
• A Clue to Kagari at Comima in 2010

Leskinen · Professor Leskinen · アレクシス・レスキネン · 亞雷克斯·雷斯金涅

A professor at Viktor Chondria University and one of the leaders of the Amadeus project. The contrast between his public academic identity and his role in the time-machine intelligence war is central to STEINS;GATE 0.

• Maho Hiyajo and Alexis Leskinen Present an Artificial-Intelligence Lecture
• Gehenna's Stigma
• The Seminar Publicly Demonstrates Amadeus Kurisu
• The Amadeus Team Is Attacked in a Parking Garage

Mr. Braun · Mister Braun · M2 · FB

Owner of the CRT shop and Nae’s father. As a young man he operated under ECHELON as M2; his encounters with Suzu Hashida and Tsuzuri Imamiya leave him caught for years between organizational orders and protecting his family.

• Suzuha Leaves a Letter of Regret before Her Death
• Okabe Receives Suzuha's Letter about the Failed Mission
• The Truth about Moeka and FB Is Revealed
• Send a D-Mail from FB's Phone to Cancel Moeka's Action
• M2 Is Ordered to Watch Suzu Hashida in Akihabara

Nae · Little Nae

Yugo Tennouji’s daughter. Across different α World Lines she may live an ordinary childhood or, after witnessing her father’s death, pursue revenge across fifteen years.

• ECHELON Takes Tsuzuri as an Experimental Subject
• Yugo Submits to SERN Again to Protect Nae
• Yugo Takes Nae to Comic Market
• Yugo Kills Moeka and Then Himself
• Nae Blames Okabe and Moeka for Her Father's Death

Faris’s father · Rumiho’s father

Rumiho Akiha’s father. Near the end of her life, Suzu Hashida entrusts him with the IBN 5100 and subsequent arrangements, allowing the computer to reach Yanabayashi Shrine.

• Suzu Hashida Entrusts the IBN 5100 to Yukitaka Akiha
• Suzu Hashida Dies of Illness in 2000
• Faris's D-Mail Rewrites Akihabara and the IBN 5100's Location
• The Faris Championship Match and the 4°C Pursuit
• Yukitaka Akiha Rescues Okabe and Faris

Tsuzuri

Suzu Hashida’s student, later Yugo Tennouji’s wife and Nae’s mother. What happens to her reveals the price of ECHELON’s control over Yugo.

• Yugo Meets Tsuzuri Imamiya and Suzu Hashida
• Yugo Opens the CRT Workshop in Suzu Hashida’s Building
• Yugo Delays Recovering the IBN 5100 and Disposing of Suzu Hashida
• ECHELON Takes Tsuzuri as an Experimental Subject

metal Upa capsule toy · メタルうーぱ

A rare Upa that Mayuri obtains at Radio Kaikan. On the β World Line it becomes mixed into Dr. Nakabachi’s papers, allowing the time-machine thesis to pass airport security; Operation Skuld must replace it.

• Mayuri Draws the Metal Upa
• Okabe Realizes the Metal Upa Saves the Paper from the Airport Fire
• The Ordinary Upa Causes Nakabachi’s Paper to Burn in the Cargo Hold

Divergence Meter device · ダイバージェンスメーター · 世界線變動率探測儀

A Nixie-tube device that displays the divergence of the current world line. Its value must be understood together with its reference point and the work’s narrative context.

• Arrive on the Steins Gate World Line
• Suzuha Explains Attractor Fields and the Divergence Meter
• Suzuha's Mission Succeeds after Her D-Mail Is Undone

IBN5100

A legacy computer able to interpret the old programming language used in SERN’s data. Its location changes as a consequence of several D-Mails.

• Delete the Original Record and Return to Beta
• Decoding SERN's Jellyman's Report
• Moeka Sends the D-Mail to Find the IBN 5100
• Suzuha Arrives in 1975 with Amnesia
• Suzuha's Memory Returns after the Opportunity to Complete the Mission Has Passed

CERN

A fictional organization modeled on the European particle-physics laboratory. In the future of the α Attractor Field, it monopolizes time-machine technology and establishes an authoritarian regime.

• The First D-Mail Rewrites the World Line
• Mayuri's Death Is a Convergent Outcome
• Delete the Original Record and Return to Beta
• The John Titor Thread Appears
• Decoding SERN's Jellyman's Report

Rounder · ラウンダー · SERN enforcement unit

SERN’s field network for locating the IBN 5100 and gathering time-machine intelligence. Members generally act through orders issued by FB.

• The Rounders Raid the Lab and Mayuri Dies for the First Time
• The Truth about Moeka and FB Is Revealed
• Okabe Is a Rounder on the Gamma World Line
• The Lab Members No Longer Trust Okabe
• M2 Is Ordered to Watch Suzu Hashida in Akihabara

ComiMa · Comiket · C78

The doujin convention Mayuri attends. Several chapters use its schedule as a temporal landmark for Mayuri’s death deadline, dates, and ending actions.

• Mayuri Still Dies after the D-Mail Is Not Undone
• Luka Time Leaps to before Comic Market
• Mayuri Still Dies after Okabe Delays the Deletion
• Mayuri and Kurisu Say Farewell before the Final Deletion

Radio Kaikan · Radi-Kan

A key location where time machines arrive, Kurisu is attacked, and multiple world-line divergences intersect.

• Dr. Nakabachi’s Time-Machine Presentation
• The First Attempt to Save Kurisu Fails
• Execute Operation Skuld
• Suzuha Asks Okabe to Prevent World War III on the Beta World Line
• Mayuri and Suzuha Depart from the Radio Building Rooftop

アマデウス

An artificial-intelligence system constructed from digitized human memories; Kurisu’s memories are used as one of its personality datasets.

• Okabe Interacts with Amadeus Kurisu
• Maho Hiyajo and Alexis Leskinen Present an Artificial-Intelligence Lecture
• Okabe Becomes an Amadeus Tester
• The Lab Holds a Christmas Party
• An Armed Group Attacks the New Year Gathering

D-mail · Dメール

A technology that sends email information into the past. Even a short message can change its recipient’s behavior and reconstruct an entire world line.

• The First D-Mail Rewrites the World Line
• Delete the Original Record and Return to Beta
• Abduction Across Three Worlds
• Kurisu Joins the Future Gadget Laboratory
• The Lotto Six D-Mail

time-leap machine · タイムリープマシン

A device that sends memory data to an earlier point in time. The user returns to their own past body rather than physically traveling.

• Mayuri's Death Is a Convergent Outcome
• Abduction Across Three Worlds
• The Time Leap Machine Is Completed
• The Rounders Raid the Lab and Mayuri Dies for the First Time
• Suzuha Confirms That Itaru Hashida Is Her Father

lifter · リフター

The mechanism that creates the electrical discharge and micro-black-hole conditions needed by the PhoneWave. The lab eventually discovers that the active 42-inch CRT downstairs serves this role.

• Kurisu Analyzes Kerr Black Holes and Lifter Conditions
• The 42-Inch CRT Is Identified as the Lifter

C204 time machine · complete time machine

A completed β World Line time machine capable of traveling into both the past and the future. Suzuha uses it in the final chapter to carry Okabe to July 28, 2010 twice.

• Suzuha Asks Okabe to Prevent World War III on the Beta World Line
• Kurisu Asks What Okabe Was Trying to Say
• Suzuha Uses C204 to Explain World War III
• Okabe Takes C204 to July 28 for the First Time
• Okabe Returns to August 21 Traumatized by Killing Kurisu

Echelon · エシュロン

SERN’s global communications-surveillance system. Its interception of the lab’s first D-Mail provides the lead through which SERN discovers the time-machine research.

• The First D-Mail Rewrites the World Line
• Delete the Original Record and Return to Beta
• The Rounders Raid the Lab and Mayuri Dies for the First Time
• Suzuha Lives in the Past as Suzu Hashida
• M2 Is Ordered to Watch Suzu Hashida in Akihabara

PhoneWave · Phone Microwave

Future Gadget No. 8, a microwave modified for remote control by phone. Under specific discharge conditions it sends emails into the past and later becomes the hardware foundation of the Time Leap Machine.

• The First D-Mail Rewrites the World Line
• The Gel-Banana and PhoneWave Experiment
• The Time Leap Machine Is Completed
• Kurisu Analyzes Kerr Black Holes and Lifter Conditions
• The Lab Names D-Mail and Defines Its Limits

RINE · RINE Trigger system · RINEトリガー

STEINS;GATE 0’s branching interaction system. Whether the player checks RINE and answers or rejects Amadeus calls changes later routes and endings.

• Gehenna's Stigma

Reading Steiner ability · リーディング・シュタイナー · 命運探知之魔眼

Okabe’s name for the phenomenon that allows him to retain memories from other world lines.

• The First D-Mail Rewrites the World Line
• Delete the Original Record and Return to Beta
• The Lotto Six D-Mail
• Luka Sends a D-Mail to Change Sex at Birth
• Faris Sends a D-Mail That Saves Her Father

RaiNet · RaiNet AB · 雷ネット翔

The competitive game at which Faris excels. In Chapter 2 it is used to exchange information about the IBN 5100, and the Chapter 7 tournament directly affects whether she reveals the truth about her D-Mail.

• Faris Trades a Clue for a RaiNet Match
• Itaru Hashida and Mayuri's D-Mail Tests Do Not Change the Outcome
• The Faris Championship Match and the 4°C Pursuit

Jellyman reports · Jellyman

Records of SERN’s secret human time-travel experiments. Subjects are gelified by failed transmission, proving that SERN has performed practical time-travel research.

• Decoding SERN's Jellyman's Report
• Kurisu Analyzes Kerr Black Holes and Lifter Conditions

world-line convergence range · 世界線收束範圍

A concept that groups world lines with broadly similar outcomes. Details may change within the group while crucial results still converge.

• Mayuri's Death Is a Convergent Outcome
• Kurisu Confronts the Cost of the Alpha World Line
• Okabe on the Gamma World Line
• The John Titor Thread Appears
• Isolated Jamais Vu

オペレーション・スクルド · 掌管未來的女神作戰

The plan devised to reach the Steins Gate World Line: preserve the appearance Okabe already observed while changing the event’s actual result.

• Arc-light at the Infinity
• Execute Operation Skuld
• Okabe Opens the Video Mail from His 2025 Self
• Vega and Altair
• Two Messages Across Time Are Recorded in 2025

Commander FB

The text-only identity whose orders Moeka obeys and a central codename in the Rounder chain of command. Its real-world identity is tied to SERN’s control over Yugo Tennouji.

• Moeka Sends the D-Mail to Find the IBN 5100
• The Truth about Moeka and FB Is Revealed
• Send a D-Mail from FB's Phone to Cancel Moeka's Action
• Yugo Submits to SERN Again to Protect Nae
• The IBN 5100 Is Still Missing after Luka's D-Mail Is Undone