"Do any of you know what the fuck is going on here?! Who's Zero?! What's this 'Nonary Game'!? C'mon! Anybody? Anything?! What the hell is going on?! What are we doing here?!"
The protagonist of the game. Junpei is an ordinary college student who is kidnapped by a mysterious masked man and wakes up in an unknown location with a bracelet strapped to his wrist. Although he is confused and frightened at first, after adjusting to the situation it is shown that he has a sharp mind and a skeptical outlook on life.His bracelet number is 5. Unlike the other eight, he does not have a codename because his real name was revealed before the group decided to keep them a secret.
Agent Scully: He is a staunch (although this can vary slightly with dialogue choices) skeptic, with a habit of putting down June's occult musings.
He tends to be quite good at coming up with the most logical and plausible explanation for some of the more outlandish theories proposed during the game.
Batman Gambit: He is capable of quite a few of these, including tricking other players into choosing the door he wants and tricking Ace into revealing himself as the villain by pretending to switch clothes with Santa (Ace cannot recognize faces).
Captain Obvious: Much of his dialog when exploring his surroundings can come off as this, but a few stunning examples stand out, such as seemingly thumping his chest over knowing how a shower's soap dish works since he's used a shower before.
Decoy Protagonist: Only in the gameplay sense; he's still the main character of the story, but at the very end it's revealed you've been playing as June all along.
Despair Event Horizon: Hits this hard in one of the Bad Endings. Specifically, the one where Clover goes Ax-Crazy. After he finds out that she murdered Santa, Seven and June, his mind breaks so hard that he actually starts to see Clover as a sort of angelic figure, and is even willing to follow her. It doesn't stop her from killing him and taking his bracelet.
It happens to him in the submarine ending too. Not only does he think that everyone else on the ship is dead, he completely breaks after June dies in his arms, to the point that he barely even registers Seven and Lotus' deaths. Ace probably did the poor bastard a favor in the end.
Friendless Background: If you check the ladder in 3rd class cabin, he reveals that he has no friends after elementary school.
Genre Savvy: Can be this depending on what choices you make...
Idiot Ball: ...while other choices give him a firm grip on this. Subverted, however, as there are only two dialogue choices that will change the ending received and they don't require much Genre Savvy on the part of the player or Junpei. It's impossible to play Junpei as holding the Idiot Ball or with Obfuscating Stupidity, as the game will advance regardless of your choices (the only difference being that the other characters will call you an idiot). In game, Junpei and the rest of the cast spend time batting around the Idiot Ball with regard to the gun from the cargo hold, which is repeatedly mentioned to be a fatal oversight, on Seven's background, and in the Axe ending, when Junpei sees the weapon in Clover's possession. Since all of these examples are beyond the player's control, Forgot About His Powers is also in play.
The Nicknamer: At least mentally. Before everyone chooses their own codenames, Junpei mentally assigns everyone simple nicknames, like "Lion" for Ace and "Prince" for Snake.
Oblivious to Love: Innuendo and flirting from June just sail straight over his head despite him crushing hard.
It varies by room. If you choose Door 4 at the start, he and June flirt quite a bit and blush during every conversation. If you choose Door 5, you won't work with June unless you force a team through Door 3 (not very romantic) or you go through Door 6 and work with June in the engine and cargo rooms, which are part of the wrong path.
Unfazed Everyman: Discussed with Santa in the engine room, as Santa points out that the correct response to the events they've faced is some form of a Heroic BSOD, whereas the majority of the cast has kept going through some combination of adrenaline and resolve.
"Ace" (Gentarou Hongou)
"What are you going to gain by being so suspicious? That's what Zero wants, you know. This game was set up by Zero, wasn't it? Any game has a winner and loser. Whoever makes it through door  is a winner, and those who don't are the losers. Zero is trying to make us fight against one another for that victory. That is why we can't let ourselves fall prey to suspicion. We have to trust one another, and form a strong bond of friendship. Otherwise, we'll end up ensnared by Zero's manipulations."
An older man with a goatee and graying hair. He generally serves as a voice of calmness and reason in the midst of the terror going on in the ship. His bracelet number is 1, and his name comes from playing cards.His original Japanese alias was "Ichinomiya" (from the word for "one"). His true identity is Gentarou Hongou, the CEO of a pharmaceutical company that (re)created the Nonary Game nine years ago as an experiment in morphogenetic fields. He and three others kidnapped eighteen children (nine pairs of siblings) and placed nine children on the Gigantic, and the other nine children in "Building Q", a replica of the Gigantic built in Nevada. After the initial game, he laid low for a while until the present day, where he is kidnapped by Zero and forced to play the game he recreated.
Batman Gambit: The main reason he offered to stay behind was because without him there was no way the others could enter door #3 and learn that Snake was dead, banking on the fact that they'll want to leave as few people behind as possible and go through doors #7 and #8.
The Comically Serious: Santa seems to have a habit of messing with him. It also shows up in the prologue when the group first chooses doors. When Lotus and Santa refuse to go through Door 5, Ace offers a hilarious "And we were doing so well."
Dramatic Irony: There's a reason for the spoiler tags. This will kick in hard once the Safe end is cleared. It also applies to his name — in the Safe ending, he's responsible for the five requisite kills to be labelled an "Ace": Akane, his three companions, and Snake.
During the prologue, when the characters are trying to figure out who Zero is, Ace suggests that the Nonary Game may be some sort of psychological experiment. That suggestion wasn't random.
Freudian Excuse: His reason for holding the Nonary game was to find a way to counteract his prosopagnosia (inability to distinguish one face from another; in this case, human faces). He conducted the Nonary Game nine years in the past to see if morphic resonance actually existed and to gain insight. After doing that, he planned on utilizing the morphic fields to get feedback from other people, said feedback describing what the facial features of humans actually looked like. Also, he was himself a victim of the ''first'' games under Lord Gordain.
A Glass of Chianti: He, along with his three Cradle executives had a snapshot where they held their glass of wine as a success of their project nine years ago.
Heroic Sacrifice: Offers to leave himself behind at one point when the group has to leave someone behind to go through numbered doors. Turns out it wasn't needed. It also turns out that he knew they were just going to end up back where he was in the first place.
And he wanted to keep the others from entering Door #3, where "Snake" lay dead after Ace murdered him.
Villainous Breakdown: Has a truly epic one in Ending 4 after Snake manages to take six bullets and is still able to rip him apart.
And then another one when Seven disrupted the original Nonary Game nine years ago.
And yet another one in the True ending, when he realizes he's fallen into Zero's trap and he's unable to exit the incinerator. Junpei describes him as "broken."
You Can't Thwart Stage One: He's on both sides of this trope: you can't thwart the original game, his murders, or his actions that prevent you from entering Door 3. It also happens to him in the Bad and True ends.
A thin, elegant man dressed in a regal fashion. He is blind, but is quite capable of getting around easily enough. Clover is his sister, and his bracelet number is 2. His name comes from the expression "Snake Eyes", a term in the dice game craps that signifies 2.His original Japanese alias was "Niels", using the pronunciation of "two" and the name of a favorite physicist, presumably Niels Bohr. He was one of the eighteen children who participated in the Nonary Game nine years ago. As a result, he knows a great deal about the game, but because Zero has threatened to kill Clover if he says anything about it, he keeps his mouth shut.
Aerith and Bob: His real name seems rather out of place when standing next to people with obviously Japanese names. His name is Light. Granted, Clover's real name is also the very not-at-all-Japanese Clover, so perhaps their parents were hippies, at least in the English version.
Of course, they could also be Japanese equivalents, or even just English words written to fit into Japanese. 'Raito' is actually used as the character's name in Death Note to sound like 'Light,' and Clover's name is actually a translation of her original, Yotsuba. Which means Clover.
Artificial Limbs: Has a prosthetic left arm, which proves the dead guy in the bathroom isn't him.
Badass Boast: He has one in the True End. "Thank you for killing the wrong man, but I can't say I like knowing that you want me dead. And even if you didn't, I would still hate you very much."
Berserk Button: Harming Clover is a really bad idea, and he can be an absolutely terrifying person if that button is pressed.
Disability Superpower: Although blind, his other senses are so good that you wouldn't even notice this unless he told you. He even mentions that if you tried to attack him, it would be unlikely that you would win. He's not joking.
Expy: He looks an awful lot like Miles Edgeworth. They also share a habit of using "post-haste."
Heroic Sacrifice: In ending #4 he holds Ace back so Junpei and the others can escape.
Idiot Hair: Subverted in Snake's case. He's rather smart.
Ironic Name: His real name is Light, which is about the worst name you could give to a blind person. Granted, he wasn't born blind.
Played straight with his nickname as well, when during his Heroic Sacrifice and Taking You with Me moment in the Safe End, he is described as a snake that "rarely lets go of its prey" as he pins Ace down, even after taking six bullets.
The Smart Guy: He's quite intelligent and unleashes withering disdain whenever others can't keep up with his logic. On top of that, he has more information from Zero than the others and is re-playing the first Nonary Game.
Santa, like Snake, is 24, and is quickly defined by his outspokenness and tendency to swear, matching his somewhat punk attire. While he often provides some amount of Comic Relief, he also shows signs of The Smart Guy and is a particularly helpful team member. Throughout the game, he's determined to keep the players moving and refuses to succumb to helplessness or in-fighting. His bracelet number is 3 and his name is derived from "san", the Japanese word for three, which was unchanged for the English-language version. (In the English version, he asks if any of the other players speak Japanese before announcing his nickname, an acknowledgment to the game's original language.)He was one of the eighteen children who participated in the Nonary Game nine years ago, along with his sister Akane. Due to an administrative error, both he and Akane were placed in the same testing group instead of being split up as the experiment demanded. He is fully aware of the true purpose of the second Nonary Game, having collaborated with Akane to perfectly recreate the vision that she saw in the closing moments of the first Nonary Game, and to take revenge on the people who put them through the Nonary Game to begin with. His real bracelet number is 9, or 3+3+3 (three threes), which may be a symbol of the multiple roles he's playing during the game. Word of God states that when Junpei hears Zero's voice, Santa is using his physic powers to communicate with him directly. During the first Nonary Game, he is depicted as having leadership qualities and is saved by Seven, along with Snake. Snake mistakes Santa for Zero during the True Ending, but believes that Santa isn't dangerous or intent on killing them.
Badass Boast: He has one in the True End. "I'm Santa Claus, remember?"
Bi the Way: Kotaro Uchikoshi tweeted "he might be able to love both male and female" when a fan asked about shipping Santa and Clover.
Can't Kill You, Still Need You: He deliberately leaves Ace alive in order to finish the trap and to force Junpei to understand the purpose of the game.
Cluster F-Bomb: He takes this trope to the point where narration simply describes him as using language that would make a sailor blush. The True End implies that he's always been blunt, but whenever he's serious, he immediately stops swearing. It may or may not be part of his Obfuscating Stupidity.
The Chessmaster: He and Akane share this role. In the True End, he reveals himself as this to Ace and to Junpei.
Crouching Moron, Hidden Badass: Underestimate him at your own peril. As a child, he was part of the original Nonary Game and trapped in the incinerator. He saved five in his cohort by telling them to go through the numbered door. Then there's the True End, in which he corners Ace, saves his sister, and goes out with a Badass Boast.
Deadpan Snarker: Whenever Junpei is in a room with him, he is a veritable fountain of sarcasm and deprecation. If he isn't snarking, it's time to worry.
Dramatic Irony: After the True End, although the Coffin End will also cause this, due to where the game stops. It goes Up to Eleven in the prologue when he states that Zero has serious psychological issues.
Expy: His motivations and role in the story are similar to that of Mei Kiridera from 12Riven, a previous work of the author's (who in turn was an Composite Character of two characters from Ever17, Ryogo Kaburaki and Hokuto).
Meaningful Name: San is Japanese for "three". In addition, he has a few stories to tell about Santa Claus. His real name, "Aoi", is a homonym for the Japanese word for "blue". His sister's name means "scarlet"; when combined, those two colors create purple— Murasaki, the original Japanese alias for "June".
Nice Shoes: He just bought them, which is why he doesn't want to go through Door 5 after the 9th Man dies. Of course, that may not be all there is to it. He and June have to move through the same doors and June was horrified by the carnage behind Door 5. Refusing to go ensured that they would remain on the same team.
Promotion to Parent: As he puts it, he "had to be like [his sister's] dad" after their parents' deaths.
Smarter Than You Look: When Junpei learns that Santa is a stockbroker, he's temporarily speechless, noting that he didn't think Santa looked smart enough. He's surprisingly helpful as a teammate and shows shades of The Smart Guy in the Kitchen.
White Hair, Black Heart: Can become this in the Coffin/To Be Continued ending, although it's ultimately subverted in the final end.
Would Hit a Girl: To be precise, he would pull a gun on one. Subverted in the True End but not the Coffin ending, which leaves his villain status ambiguous.
Wounded Gazelle Gambit: Junpei suspects Santa of pulling one at one point. It's suggested Junpei is right and that Santa is letting Ace keep control of Lotus (and the others) until Junpei arrives, so that Junpei can learn his true purpose in the game.
"I would'a thought a guy your size would have bigger balls than that."
A cheerful girl prone to rapid swings of emotion. She is Snake's sister and her bracelet number is 4. Her name comes from the number of leaves on a four leaf clover.Her original Japanese alias and real name was "Yotsuba", which means "clover" (literally, "four leaves"). Like her brother, she participated in the Nonary Game nine years ago. Unlike her brother, she was one of the subjects at Building Q in Nevada, rather than at the Gigantic with Snake, Santa, and Akane. As such, she knows a lot about the Nonary Game, but was told by Snake never to mention it to anyone.
Ax-Crazy: In ending #3, she completely loses it and goes on a killing spree out of revenge for her brother.
Break the Cutie: It isn't actually the Nonary Game itself that does this, especially since she's already experienced it once. No, what breaks her is Snake's apparent death.
The Chick: Though not as much as June. The two of them are never in Junpei's group at the same time.
Despair Event Horizon: She'll cross this in some way in nearly every path. It's only possible to save her from it in the True End path.
Drives Like Crazy: The true end's epilogue, where she speeds in an SUV, making a very bumpy ride for the passengers. Justified in that they're in the middle of the Nevada desert, and there's no one or nothing around to watch out for. Also doubles as a Momentof Awesome and a Funny Moment in that Ace is tied up in the trunk, feeling the worst effects of the ride.
Tsundere: A rare non-romantic example of a Type B Tsundere. For the most part, she's very friendly and cheerful until someone is trying her patience, at which point she turns very rude and condescending.
"June" (Akane Kurashiki)
"I'm not really Zero. Not yet. Perhaps you could say I am... less than Zero."
An old friend of Junpei's from elementary school. She's always helpful and works hard to make sure no one is left behind, although she is occasionally prone to feverish spells. Her bracelet number is 6, and her name comes from the sixth month of the year.Her original Japanese alias was "Murasaki", from the word for "six". The word's literal meaning of "purple" also applies to her clothing, her eye color, and certain other aspects of the game. As later suggested by the real name and bracelet number of "Cap", the mu syllable can be interpreted either as "six" or "nothingness".She was one of the children who participated in the Nonary Game nine years ago. At the climax of her Nonary Game, Akane became psychically linked with present-day Junpei and witnessed him play the second Nonary Game. Furthermore, Akane has a unique power that let her perceive every possible variation of events in the second Nonary Game, and transmit this information to Junpei to help him out.This psychic link would save her life, as present-day Junpei would help her solve a puzzle that freed her from the last lethal trap of her Nonary Game. However, this chain of events caused a Temporal Paradox: if the events that she had foreseen did not occur, then Junpei would never be in a position to become psychically linked with her past self and thus save her life. And so, Akane schemed with her brother Aoi to recreate the events she had foreseen in the past, masterminding the second Nonary Game to safeguard her own life while also taking revenge on those who put her through that ordeal in the first place.
Agent Mulder: Believes in occult tropes like the mummy's curse and automatic writing.
Bitch in Sheep's Clothing: The Akane we see and the Akane we know are two completely different people by the end of the game. Word of Godeven admits she'd be perfectly fine with killing someone as long as it benefited her.
Break the Cutie: Akane seems greatly affected by their situation and the mistrust within the group, which combines with her Ill Girl attributes. While the behavior of present-day Akane is a lie, the events of her Nonary Game did traumatise her so much that she became a coldhearted manipulator.
Broken Bird: Implied to be her true nature, caused by the first Nonary game traumatising her so much.
Covert Pervert: Her first thought when Junpei examines a bed in one of the cabins? Blushing and muttering, "Haha, no... it's much too soon for that..." She also teasingly suggests that they shower together when looking over the same cabin's bathroom.
I Am Not Pretty: In Cargo Room (Door 6), checking her own card will cause her to believe that she's not attractive to guys, unlike Lotus and Clover.
Ill Girl: Suddenly comes down with a fever at regular intervals in the game. This signifies when Junpei is not following the exact chain of events that would lead to her being saved in the past. The fever is literally indicative of her past-self burning to death in the incinerator.
Innocent Innuendo: Invokes this a lot, bordering on The Tease. Though given she knows everything about Junpei's actions, it may not be so innocent...
Xanatos Gambit / Gambit Roulette: The entire Nonary Game is an elaborate plan to save her life in the past! In this case, because of the multiple timelines, (here's where the Gambit comes in) its failure condition is also its success condition.
"H2O... H must mean "hot", and O probably stands for "orphans"... So H2O must be made of 2 hot orphans..."
A towering mountain of a man wearing a beanie and suffering from amnesia. Despite his bumbling nature, he is very dependable and well-equipped for solving problems. His bracelet number is 7. His name comes from... the number seven.His original Japanese alias was the English word "Seven". He is a detective that searched for the missing children that were forced into the Nonary Game nine years ago. He was caught and locked in a cell in the Gigantic, but managed to escape and also save many of the children in the process. After these events, he attempted to track down the mastermind Gentarou Hongou to bring him to justice, but never found him.He claims that he was unable to save Akane, and that she was the only child to die in the original Nonary Game. However, this contradicts the chain of events that led up to the creation of the second Nonary Game. Considering that he is one of the only eye-witnesses to the events of the first Nonary Game, it is very likely (but not confirmed) that he is collaborating with Zero.
Beergasm: He drinks the booze from the Casino, was about to drink pure ethanol in the Operating Room, and actually does drink industrial strength detergent in the same room. How he's still alive is anyone's guess...
No Name Given: Even Word of God states that he didn't really think of Seven's real name, unlike Lotus's semi-official name.
Scars Are Forever: Word of God reveals that Seven got his scars from an incident after the first Nonary Game before. He fought an evil global organization.
Given all of the details from both this game and the sequel, as well as Alice's ability to contact him easily, the likelihood is high that the organization he was working against was Free The Soul, something Word of God confirms.
Scary Black Man: Subverted. He looks the part, but he's actually a pretty nice guy (though he can be quite a smart ass). He's not actually black either.
An older woman dressed as a belly dancer. She has an abrasive and aloof personality, and tends to act only towards her own self-interests. Her bracelet number is 8, and her name comes from the number of petals on a lotus.She is an incredibly intelligent computer hacker, working as a digital security consultant, who only dresses like a belly dancer because she likes the fashion. She has two daughters, both of whom were involved in the first Nonary Game.Her original Japanese alias was Yashiro, from the word for "eight".
All There in the Manual: Only her last name is mentioned in the game itself. A Q&A on the official English website states her first name is Hazuki, but even that is just a "possibility" more than an official name.
"A-Ah... Oh my God, oh my God, there's no time left... Listen! I was lied to! He lied to me! He put me in here! It was him! He killed me! It was him!"
A jittery and nervous man with glasses who seems to know more than he should. His bracelet number is 9. Although written with different kanji, the first syllable of his family name is a homonym of the word for "nine". His true identity is Teruaki Kubota, one of the four men responsible for the first Nonary Game nine years ago. While Gentarou Hongou was the mastermind behind the project, Kubota was the one who designed the technology used in the Nonary Game. With that in mind, he attempts to break away from the group to escape on his own after Hongou (as Ace) tricks him into believing that the DEADs were changed so that only one person had to verify them. He dies soon after, and his death immediately serves as a lesson on how deadly the game truly is.
His Name Is...: Before he died, he warned the other 8 people about "him" lying to the 9th Man. Ace made his last words a lot more clearer during the confession.
Jerkass: The only "evil" thing he has actually done is taking Clover hostage so he can try to escape. It just shows you the game is indeed real and not a joke. Then again, you really didn't expect him to be the calm and rational type, didn't you?
Mad Scientist: Sort of. He was one of the men behind the original Nonary Game and responsible for developing the necessary technology.
Never Trust a Trailer / Covers Always Lie: He seems like he's going to be much more relevant to the plot in the promotional material. However, he dies in the prologue. He does serve a bigger purpose in the backstory, though. So he's pretty much still considered one of the main characters, even if he only has an indirect appearance.
No Name Given: He doesn't even get a nickname as he blows up in the first few minutes of the game. You actually do find out his real name later, though.
Starter Villain: The first person to blatantly antagonize the others besides Zero, and dealt with quickly.
Story Breaker Power: Why he's a Sacrificial Lamb. The number 9 can be added to any combination of numbers without changing the digital root, allowing for an incredibly easy time escaping all the numbered doors.
Time Bomb: Played HARD for him. This guy just never catches a break, does he?
Not actually the captain, but a man dressed as one. His true identity is Kagechika Musashidou, one of the four men responsible for the first Nonary Game nine years ago. He was the one who financed the Nonary Project. Hongou was given a note in which he was asked to confess, and be released. Musashidou was brought in as a witness, although this was just a Batman Gambit by Akane to have him killed off by Hongou.
What Happened to the Mouse?: An encounter between Clover and him happens offscreen in the leadup to the Safe Ending, but he himself is not mentioned, nor is what happened to him afterwards in that timeline.
Walking Spoiler: As you'd expect from a character in a section partially titled "Spoiler."
Guy X (Nagisa Nijisaki)
His true identity is Nagisa Nijisaki, one of the four men responsible for the first Nonary Game nine years ago. He was the second-in-charge of the Nonary Project. He is killed by Hongou, mistaking him for Light. This was orchestrated by Akane, who swapped his clothing with Snake's.
Walking Spoiler: Like the other two characters here, his existence and involvement in the story is a massive spoiler.
Lord Dashiell Gordain
The creator of the original Nonary Games. An English eccentric millionaire, he was a survivor of the Titanic's submersion and later obsessively attempted to purchase everything related to the Titanic. He purchased All-Ice and the Gigantic (after its incident in WWI.) He would take young Englishmen who'd accumulated massive debts and force them to play Nonary Games on the ship. He would enjoy the show with his millionaire friends and they would bet money on who would survive. All the losers were burned in the incinerator as a sacrifice during a ceremony (which the robes Snake woke up in were used for). After many years of this, Gordain died of old age but the games were continued by his successors. Ironically, Ace was kidnapped during the last game.