All spoilers up to Volume 6 are unmarked.
Anti-Vector Crime Unit
Lieutenant Shin'ichi Kenzaki
The main protagonist, a police lieutenant and investigator with the Tousai Precinct. After his sister Ikumi was given RDS by the Vector Teruyoshi Kouda and subsequently died trying to prove she wasn't infected, he accepted the position as chief of the new anti-Vector task force, using his hatred of Vectors to fuel his dive into the mysteries behind RDS.
- Abusive Parents: His father was an abusive drunk who beat him and harassed his sister, while his mother was neglectful and never took action. He seems to have reconciled with his mother enough to speak to her at Ikumi's grave, but still hates them both.
- Anti-Hero: Willing to cross certain moral lines and manipulate both his opponents and allies if it helps him get more information and capture his targets.
- Badass Normal: He's just an average human (albeit with Resurrective Immortality), but he can go toe-to-toe with the freakish Escape Artists with just a gun and his wits.
- Batman Gambit: He specializes in strategizing based on the information he has and the assumed behavior of others. For example, he accurately predicts that Fuurin will throw Snow White through the window when cornered, based on Snow White's number of victims meaning she had earned enough "points" to be given Revival and would therefore not be killed, allowing him to capture her.
- Big Brother Instinct: As stoic and serious as he is, he was a loving brother to Ikumi and her death shook him badly. His developing sympathy for Fuurin, despite her attempts to be romantic, can be tied partially to this.
- The Chessmaster: A master tactician who knows how to orchestrate complex gambits to stand against the Escape Artists.
- Da Chief: Not of the whole precinct, but he's named chief of the Crime Unit and everyone answers to him.
- Deadpan Snarker: On occasion. His response to Wakabayashi and Kyoko doing a poor job of hiding the fact that they had sex is to stare blankly at them for a few seconds, light up a cigarette, and go:Kenzaki: Good for you two.
- Guile Hero: While he's a good shot and willing to dive into the front lines if necessary, he prefers to solve problems and pin down Escape Artists by carefully manipulating the circumstances to trap them.
- Not Distracted by the Sexy: His reaction to a fully nude Karigane proposing to ride him in exchange for her help? The same serious stare as always, and only begrudging acceptance.
- Oral Fixation: Nearly always has a cigarette in his mouth, even if it's not lit.
- Shotguns Are Just Better: His Weapon of Choice is a 12-gauge shotgun.
- Smoking Is Cool: Zigzagged. His near-constant smoking is framed in such a way as to make him look cool, but he's only doing it because lung cancer isn't a problem in a universe of immortals, and Fuurin comments that his mouth tastes terrible when she kisses him.
- The Stoic: Even before his sister's death, he kept up a serious facade. He also, unlike Fuurin and Tsubaki, only has a few scattered moments where his emotions break through.
One of Kenzaki's most trusted subordinates. A youthful ladies' man with an easygoing attitude, Wakabayashi is nonetheless a hardworking officer with a devious side that makes him nearly as dangerous as his boss.
- The Charmer: Always able to turn on the charm around women, whether to genuinely attract them or for the purposes of a police action.
- Deadpan Snarker: More so than Kenzaki.
- Fair Cop: Boyishly handsome and quite charming.
- The Lancer: To Kenzaki, sharing the position with Shigematsu.
- Marriage of Convenience: The main reason he and Kyoko agree to marry so quickly is because RDS doesn't affect people who settle down and have children, though they do genuinely like each other. The revelations about the way RDS works, however, call into question whether they actually had any choice in the matter.
- Would Hit a Girl: He slaps Kyoko in an attempt to calm her down, but everyone calls him out on it and he immediately regrets it.
Kenzaki's other direct subordinate, a 52-year-old veteran cop and married father of one. His advanced age doesn't stop him from charging into battle and holding his own against Escape Artists and Vectors.
- Friendly Sniper: Has the best aim of the three main officers, and often hangs back with a sniper rifle during planned operations.
- The Lancer: To Kenzaki, sharing the position with Wakabayashi.
- Papa Wolf: He's intensely protective of his daughter Marie. When she somehow catches RDS and dies in her sleep, he goes a bit haywire in his desperation to make UNDO give him answers.
- Sanity Slippage: After Marie's death, he loses his cool and goes on a violent search for answers, not even giving up when Kanai has Tsubaki torture him.
- Technologically Blind Elders: Subverted. Despite his age, he's very familiar with MMORPGs and explains the concept to the oblivious Kenzaki when they're relevant to the Snow White case.
One of the Crime Unit's office workers; she rarely leaves the precinct while the others engage the enemy directly, but makes herself useful with research and support.
- The Chick: The only woman on the Crime Unit with a major role, and the least physically capable.
- Girl Friday: Takes this role sometimes.
- Likes Older Men: After drunkenly sleeping with Wakabayashi, she emphatically states that she normally only likes older, dandyish men with facial hair — the exact opposite of her partner. Nonetheless, she likes him and agrees to the Marriage of Convenience. As it turns out, there wasn't much choice in the matter.
- Marriage of Convenience: The main reason she and Wakabayashi agree to marry so quickly is because RDS doesn't affect people who settle down and have children, though they do genuinely like each other. Kyoko even feels bad about jumping into it for that reason. The revelations about the way RDS works, however, call into question whether they actually had any choice in the matter.
- Nice Girl: Kind, caring, and spunky.
- Those Two Guys: Usually paired with Satellite Character Naomi, who otherwise gets no characterization.
The Escape Artists
The apparent leader of the Escape Artist organization, and Fuurin's biological mother. Little is known about her identity, past, or motives, and she prefers to keep it that way. While her protective subordinates prefer it when she stays in her inner sanctum, she holds immense power in her own right and has the utter ruthlessness to match.
- Abusive Parents: She has not treated Fuurin kindly over the years, judging by her willingness to use force and how quick Fuurin is to snap at her. A particular flashback shows Mama standing by while Karigane makes a young Fuurin shoot a mortal maid she befriended to toughen her up.
- Badass Driver: During the motorcycle chase with Kenzaki, she manages to do insane stunts with the help of her Combat Tentacles.
- Bathing Beauty: She loves taking baths, to the point that almost every scene of her at her home has her either bathing or telling her maids to draw her a bath.
- Big Bad: The apparent source of all conflict, responsible for training the Escape Artists and playing some role in bringing Vectors into her universe.
- Combat Tentacles: Has the most and strongest obis of any Escape Artist, rivaling Tsubaki for raw power. She mainly uses them to crush underlings who've failed her, but shows cleverer uses in the chase with Kenzaki.
- Dark Action Girl: Whenever she's out in the open.
- Deadpan Snarker: Much cockier and snarkier than her daughter, especially once her face is revealed.
- Everyone Calls Him "Barkeep": So far, nobody has mentioned her real name. Even Karigane, who appears to be the same age or older than her, calls her Mama.
- The Faceless: For the first few volumes, her face is hidden in shadows or behind a screen, and she wears a wig to disguise her real hairstyle. Only when she appears in full do most of her real traits start to show.
- Hidden Agenda Villain: Why she's so intent on spreading RDS and protecting Vectors is unknown. Fuurin reveals that she was once a guardian of the Red String of Fate system, but for some reason is now fighting against it.
- Hidden Depths: Underneath the fancy and grandiose facade she maintains, she's not that different from any other human. There are even hints that she cares about Fuurin on some level, including the depression she seems to spiral into when Fuurin's team is captured, but they're buried deep.
- Meganekko: Wears glasses just like her daughter.
- Orcus on His Throne: She's immensely powerful and skilled, but prefers to let her Escape Artists do the work for her unless she absolutely has to go outside.
- Strong Family Resemblance: Once her real face is revealed, she looks almost exactly like Fuurin, but with light blonde hair rather than black.
Fuurin / Rin Kazama
One of the best active Escape Artists, as well as the Deuteragonist / Villain Protagonist of the story. After saving Kouda from Kenzaki's wrath at the scene of Ikumi's suicide, she and Kenzaki continued to meet — at a distance as active enemies, and in person when she works at the precinct under the assumed name "Rin Kazama". When on a mission, she is recognizable by her Sailor Fuku and dual-wielded machine guns.
- Action Girl: Being the Deuteragonist, she blends this with Dark Action Girl depending on whose perspective we're seeing. There's no question about her being badass, though.
- Adorkable: Practically whenever she's not gunning people down. Best seen when she buys a romantic advice manual to complete her mission of seducing Kenzaki, only to religiously adhere to it and constantly quote even the questionable lines.
- Arch-Enemy: A complicated one to Kenzaki. He hates her for being the Escape Artist who allowed his sister's killer to get away, but he also grows to subtly sympathize with her in a way he doesn't toward Kouda.
- Combat Tentacles: Has them like most Escape Artists, though she mainly uses hers for mobility and tossing.
- Death Seeker: Her diary states that she wants to be released from immortality so she can know what it's like to finally die. Given her life, it's understandable.
- The Dragon: Mama's best operative and the standard most Escape Artists are held up to, at least until Karigane comes out of retirement.
- Emotionless Girl: Her general demeanor, in everyday life and in combat. However, she proves to secretly be Hot-Blooded whenever she lashes out.
- The Faceless: To Kenzaki and the Crime Unit for a long time, since she wears a strip of reflective tape that obscures her face in light, preventing them from noticing that she's a girl in their office.
- Guns Akimbo: Her Weapon of Choice is a pair of machine guns, wielded in either hand thanks to her superhuman strength.
- The Heavy: For the first few volumes. There are other Escape Artists and Mama lurks in the background, but Fuurin is the one most directly antagonistic to Kenzaki.
- HeelFace Turn: Following her rescue from the UNDO HQ and the realization that Mama bartered her life, she takes a vow to serve Kenzaki instead.
- Lightning Bruiser: Moves quickly and sprays out more damage than most of the police force can deal with, and has the same Resurrective Immortality ensuring that she can survive whatever they can throw out.
- Meganekko: Wears prominent glasses.
- The Mole: Inside the police force, until Kenzaki figures her out and stops her from gathering intel.
- Training from Hell: Her entire childhood was this. Constant drills and combat exercises before she hit puberty, dealing with abuse from her mother and Karigane's mind games, and whatever else turned her into a stoic Death Seeker.
- Villain Protagonist: The main character of the Escape Artist's side, until her HeelFace Turn.
A young woman raised as Fuurin's younger sister, though their biological relationship is unclear. Only recently made her debut as an Escape Artist after years of training.
- Always Second Best: She feels she is judged harshly because Fuurin is better than her, pushing her to more extreme lengths to prove herself.
- Cluster F-Bomb: When she's frustrated after Mama judges her harshly for the Snow White mission's failure.
- Extreme Doormat: Despite her immense Pride, she is this until Karigane motivates her to grow a spine.
- Pride: Her core flaw.
- "Well Done, Daughter!" Girl: All she wants is for Mama to praise her the way she praises Fuurin, regardless of what she has to do to earn that praise.
The depraved, terrifying former chief instructor of all Escape Artists. After spending some time in retirement, Mama draws her back into active duty to assist Fuurin and Kiriko with her unmatched skills.
- Bi the Way / Depraved Bisexual: She openly swings both ways, directly propositioning Kiriko and Kenzaki. Which trope counts more depends on how crazy she actually is; as well, she seems genuine about "being sweet" to Kiriko, and stops doing anything more sexual than groping with Misago because she's not her type.
- Blood Knight: She is very open about getting turned on by the heat of battle, and usually takes on a Slasher Smile whenever she gets to swing her sword.
- Blue and Orange Morality: The way she sees the world is... odd, and she is capable of both apparent kindness and extreme cruelty at a moment's notice.
- Boobs of Steel: The most well-endowed member of the cast and one of the most unstoppably powerful.
- Catchphrase: "I commend you." She can barely go a few sentences without saying it somewhere, whether talking to a casual friend or a Worthy Opponent, to the point that it seems like a Verbal Tic.
- Closet Key: During the escape mission from UNDO, she tells Misago she'll give her a "big hug in her bed" once they're out of there. When Misago tells her she's not into women, she replies by saying "Once you taste it, you won't be able to get enough of it." The next day, cue Misago staggering and telling Sayori she's exhausted "but not because of the mission" and repeating Karigane's exact words with a smile and a blush.
- Cold-Blooded Torture: Specializes in this, as seen when she inflicts it on a pair of UNDO agents they need information out of.
- Combat Tentacles: As with the rest of the Escape Artists, although she only has two despite her power being comparable to Mama's. She mainly uses them to speed around the environment and assist in her sword strokes, which proves problematic in her duel with Tsubaki, until she figures out how to penetrate her perfect defense.
- Dark Action Girl: An incredibly fierce and remorseless warrior who happens to be female.
- The Dragon: To Mama, before her retirement and after coming out of it. Fuurin is her most trusted Escape Artist, but Karigane is orders of magnitude more powerful and is one of the few people who can speak to Mama like a friend.
- The Dreaded: Every Escape Artist knows about her, and even those who haven't met her quiver upon hearing her name.
- The Gadfly: Very fond of pushing her allies' buttons.
- The Hedonist: Much of her personality is based around casual pleasure, whether it's the thrill of a fight or having sex. There are implications when she talks to Misago before going to fight Tsubaki that she uses pleasure to drown out her fear, but whether she meant this and whether it's true remain to be seen.
- Lightning Bruiser: The fastest Escape Artist by far, and one of the most durable and deadly.
- Master Swordsman: Exclusively uses her sword in favor of any firearms, and proves time and time again that this isn't a hindrance to her in any way.
- Ms. Fanservice: A gorgeous Statuesque Stunner who gets the most extreme Fanservice, including a full panel of her uncensored nudity, without being bothered by any of it.
- Nice Hat: Wears a traditional conical straw hat, contributing to her Samurai motif.
- Pet the Dog: Is genuinely nice to Misago, and gropes her purely to make her feel better, stopping afterward because she's not the kind of woman she usually pursues.
- Samurai: Between her straw hat, her loose flowing robes, and the elaborate way she moves her sword, it's clear that she styles herself after one.
- Shoot the Dog: When Fuurin was a little girl, Karigane saw that she had made friends with a mortal Vector working as a maid for Mama. Displeased, she tied the maid up and forced Fuurin to shoot her, with Mama's help, just to keep her from going soft.
- Statuesque Stunner: An extremely tall warrior woman with Boobs of Steel and Hartman Hips.
One of the new Escape Artists who graduates after Fuurin's team is captured. Misago refers to her as "Miss Chin".
- Attack the Mouth: Her nickname stems from the fact that she somehow keeps getting her jaw blown off in firefights.
- Butt-Monkey: A semi-competent rookie who is consistently humiliated, injured, and forced to let the more skilled Escape Artists handle the task she's failed at.
- Embarrassing Nickname: "Miss Chin" has a habit of getting repeatedly shot in the mouth, blowing her chin clean off.
- Groin Attack: During the UNDO raid, "Big Bro" jams a shock baton into her crotch under the assumption that she's a man. The pain is almost enough to cripple her, but she's saved by Kenzaki's timely arrival.
- Only Sane Man: She seems less like an Ax-Crazy devotee and more like a normal human woman struggling with her responsibilities, making her one of the few Escape Artists who seems genuinely sane.
- Tomboy: Smokes, drinks, and dresses in traditionally masculine clothes.
- Those Two Bad Guys: Paired up with Misago.
Another new Escape Artist, always partnered with Sayori.
- Ambiguously Gay: Though she says she's straight, she's clearly enamored with Karigane after their first meeting and winds up enjoying her groping. She even decides to follow Karigane from then on, insisting that she wants more of "it".
- Arms Dealer: Of a sort; she's in charge of acquiring the Escape Artists' weapons.
- Older Than They Look: She looks like a stumpy preteen, but all of the Escape Artists are at least young adults.
- Pointless Band-Aid: Perpetually wears a bandage over her nose, which is extra pointless in a universe where people use Resurrective Immortality to deal with minor injuries.
- Those Two Bad Guys: Paired up with Sayori.
One of Mama's personal attendants.
- Battle Butler: While she appears to be a meek maid with no special abilities, she's put in charge of the raid on the UNDO Cryo Prison and proves competent as a ruthless Frontline General.
- Frontline General: Exchanges her kimono for a military uniform and rolls into the UNDO facility atop a tank, strategizing for most of the siege while dodging gunfire and explosions.
- Mission Control: For the Escape Artists in the UNDO raid.
Mama's other handmaid.
- Bandage Babe: After being punished for her betrayal, her slowed Revival forces her to have her face covered in bandages.
- Black Comedy Rape: Molests Kouda immediately after taking on Mama's identity.
- Bodyguard Betrayal: A non-harmful example. In the wake of Fuurin's capture and Mama's depression, she quickly loses her mind and dubs herself "New Mama", attempting to take over all Escape Artist duties and taking Mama's place at the meeting with Kenzaki.
- Foil: To Karatachi. While Karatachi is an earnest and loyal handmaid who unquestioningly performs her duties for Mama, Hiiragi is an opportunistic psychopath who jumps at the chance to be The Starscream.
- Rewarded as a Traitor Deserves: When Mama finds her at the meeting with Kenzaki, she is swiftly and violently crushed into a pulp before Kenzaki. And because she is a lower servant with slower Revival more akin to a Healing Factor, she stays that way for some time.
- Slasher Smile: Gets a near-constant one after betraying Mama.
- The Starscream: Immediately subsumes Mama's identity and purpose when Mama is shaken by the loss of Fuurin.
Ikumi's former boyfriend, until he was outed and had to be saved by Fuurin. He isn't a naturally evil person, but as the man responsible for Ikumi's death, he is Kenzaki's Arch-Enemy. He is training to be a full-fledged Escape Artist.
- Ambiguously Evil: Despite being a major antagonist for Kenzaki, he's not a visibly bad guy and seems like the nicest of the major recurring Vectors. However, he never directly objects to infecting and killing people who fall in love with him (whereas one Vector commits Suicide by Cop when she learns what she's doing), and Escape Artists are at the very least morally dark grey.
- Arch-Enemy: To Kenzaki, who sees him as his sister's murderer and is always looking for information on his whereabouts.
- Boom, Headshot!: He delivers one to Ikumi in the manga's opening pages, in a direct mirror to how she'll actually die later on.
- Getaway Driver: As he lacks the superhuman strength and Combat Tentacles most of the other Escape Artists have, he's stuck as the driver for the Escape Artists and Vectors to rendezvous with.
- Nice Job Fixing It, Villain!: By replying to Wakabayashi's text on Fuurin's phone after her capture, he confirms the Crime Unit's suspicions about Mama and gives them leverage to set up a meeting with her, directly leading to the UNDO raid and Fuurin's HeelFace Turn.
- Non-Action Guy: He's an everyday human with no special training, so he doesn't stand a chance against any of the other characters.
- Voice with an Internet Connection: Mostly serves as this for Kiriko.
An obese Vector who has killed three women. Caught by the Crime Unit and desperate to avoid UNDO disposal, he becomes Kenzaki's informant and first connection to the world of Vectors.
- All Men Are Perverts: Pervs on female characters and loudly wishes he had a hooker with him when he and Kouda are in hiding.
- Bad Liar: Kenzaki and Shigematsu catch him by pretending to have toothaches and asking him about the dentist (at Kanai's advice), causing him to immediately share his advice for dealing with something that doesn't exist in their universe.
- Fat Bastard: Morbidly obese and absolutely a bastard.
- Faux Affably Evil: He puts on a Nice Guy mask and pretends to befriend Kenzaki, but deep down he's a perverted, unrepentant Dirty Coward with a callous streak.
- The Informant: The only reason he's alive is because he has information to offer about Vectors and Escape Artists, which Kenzaki uses to plan his attacks on the real enemies.
- Smug Snake: He delights in being a bastard and loves to taunt Kenzaki and the others.
A young woman with a psychotic fondness for spreading RDS. Infecting the men in her MMORPG clans by pretending to be in love with them, she has racked up numerous victims and quickly become one of the most dangerous Vectors in Japan.
- Arc Villain: The central focus of the conflict for a brief period after her introduction, gleefully rampaging around while the cops desperately try to apprehend her and the Escape Artists try to rescue her.
- Ax-Crazy: And how. There are plenty of insane characters, but Snow White is by far the most unstable and violent, and not even Karigane can match her aimless sadism.
- Death by Sex: Exclusively spreads RDS by sleeping with men, since she believes that sex is the only component of love. Judging by her bodycount, it works.
- For the Evulz: She has no reason to be so enthusiastic about spreading RDS other than pure sadism.
- Gamer Chick: Both her hobby and her means of luring in lonely men.
- Groin Attack: On two occasions, she shoots a man in the crotch numerous times, forcing him to suffer in agony while depriving him of anything he could use to Revive.
- Laser-Guided Karma: The girl who enjoyed spreading RDS and mutilating men for no reason is thrown violently straight through a plate glass window, which averts Soft Glass and cuts her nearly to ribbons. Then she's captured and locked in a Cryo Prison.
- Only Known by Their Nickname: Snow White is the only moniker ever used for or by her, and her real name is unknown.
- Serial Killer: A serial RDS spreader with at least 37 victims under her belt.
- The Vamp: She uses her beauty and false kindness to manipulate men into sleeping with her, but she's rotten to the core and utterly unsympathetic.
The somewhat creepy leader of the UN Disease Control Office, who clearly knows more about Revival and RDS than he ever lets on. He and Kenzaki are frequently forced to meet and work together, despite their mutual distaste for each other.
- Ambiguously Evil: He's clearly not on the up-and-up, knows more about the situation than anyone else except Mama, and is orchestrating a genocide of Vectors, but whether he's on the Big-Bad Ensemble or is a Necessary Evil remains to be seen.
- Dissonant Serenity: Never raises his voice and rarely breaks from his standard serene smile, even when one of his bases is getting torn up by a massive gunfight.
- Four Eyes, Zero Soul: A smug sociopath who wears glasses.
- Government Conspiracy: On or near the top of one. He apparently knows the truth about Revival, RDS, and the Vectors, but is only ever willing to give piecemeal hints to Kenzaki and otherwise desperately covers up everything. The end of Volume 6 confirms that he knows all about the romantic predestination system, and is desperate to protect it and keep it from giving out.
- Hero Antagonist: Possibly. He's an antagonist, but he's on the side fighting to keep humanity immortal and is willing to engage in Teeth-Clenched Teamwork with the protagonists.
- Lack of Empathy: Feels nothing for anyone who crosses him, even the grieving Shigematsu.
- The Rival: He openly hates Kenzaki and Kenzaki doesn't hold him highly in turn, but they keep popping up on each other's paths and interfering with the collective goal of stopping the Escape Artists.
- Slasher Smile: He perpetual grin extends to this at times.
- Smug Snake: Is far above Kenzaki on the chain, and he makes it very clear that he loves it.
First Lieutenant Camellia Kuribayashi / Tsubaki
Kanai's aide-de-camp, a mysterious military officer with power to rival even the best Escape Artists.
- Action Girl: Possibly even more powerful than Mama, which would make her the strongest character in the series so far.
- Ambiguously Brown: Her skin is some shade of light brown, but her true ethnicity is unknown.
- Climax Boss: Karigane fights her at the climax of the rescue mission, and her defeat heralds Fuurin's Exposition Dump revealing many of the answers to the story's questions.
- Combat Tentacles: Has the same kind as the Escape Artists, but a full ten of them, and by far the most powerful and versatile set shown.
- The Dragon: To Kanai, serving as his aide-de-camp — in other words, his confidant, personal bodyguard, chief enforcer, and whatever else he needs of her. Her very existence is a big reason for UNDO's efficiency in Vector hunting.
- Dynamic Entry: She arrives at the besieged UNDO Cryo Prison by diving out of a helicopter. Without a parachute. Landing on her feet.
- Hoist by His Own Petard: Her Desperation Attack is a secret eleventh obi tendril that she sends out when Karigane has severed all of her other obis, believing she is taking her opponent by surprise and winning. However, Karigane predicted this and just wanted to draw out her last defense and source of immortal blood, leaving her completely defenseless.
- The Juggernaut: Wherever she wants to go, she cannot be stopped, even by a team of the best Escape Artists in active duty. It takes Karigane draining her of much of her blood through her Combat Tentacles to even slow her down.
- Mighty Glacier: While capable of moving fast and performing acrobatic feats on par with the Escape Artists, she generally prefers to stand rooted in one place and let her many Combat Tentacles do the striking, crushing, stabbing, etc. This turns out to be her undoing, as Karigane tricks her into sending out all of her tendrils before severing them, depriving her of immortal blood.
- Neck Lift: Specializes in doing this, with both her hands and her obis.
- One-Woman Army: This woman singlehandedly captures some of the best Escape Artists alive, and her dropping onto the field is enough to stop a well-oiled assault force dead in its tracks and push its leader to order a retreat.
- The Spook: Nothing is known about her past, how she got her abilities, or why she came to work directly for Kanai. She's simply a nigh-unstoppable government soldier who throws herself into the fray.
- The Stoic: Rarely displays any emotion, keeping her demeanor strictly professional. Shown to be Not So Stoic on a few occasions, such as when Karigane discovers her weakness.
A pair of UNDO officers Sayori's unit meets during the mission to rescue Fuurin. "Little Bro" is an intelligent sniper, while "Big Bro" is only slightly above Dumb Muscle.
- Big Guy, Little Guy: Big Bro is a bulky man who wears body armor and towers over his opponents, while Little Bro is scrawnier and more prone to hiding.
- Boss in Mook's Clothing: They may not even have names, but with their fighting skills and tactical prowess, these two cause no end of trouble for the Crime Unit and Escape Artists trying to rescue Fuurin.
- Brains and Brawn: Little Bro is the brains, hanging back with a sniper rifle to keep opponents from running off and shooting Big Bro to trigger his Revival if he goes down. Big Bro, meanwhile, is pretty dumb, but makes up for it with raw power and dirty tricks.
- Curb-Stomp Battle: They deliver one to Sayori and Misago only to be on the receiving end shortly thereafter when the Crime Unit show up. Much later, they return to cause trouble again only for Fuurin to wipe the floor with them.
- Fingore: Shigematsu snipes Little Bro's fingers off to keep him from shooting.
- Groin Attack: Big Bro dishes a nasty one out to Sayori with his shock baton, and subsequently gets one himself with both batons still clutched by his dismembered arms.
- Those Two Bad Guys: Only ever seen in a pair.
- Verbal Tic: Big Bro has a habit of repeating whatever new information he's given multiple times, to Little Bro's amusement.
Kenzaki's younger sister. Her RDS infection and death kicks off the story.
- Boom, Headshot!: Has Kouda shoot her in the opening pages to cure her cold, and ends up shooting herself permanently by chapter's end.
- Decoy Protagonist: She's introduced quite a few pages before her brother, and most of the chapter follows her perspective. Unfortunately, she doesn't last to the second chapter.
- Driven to Suicide: Shoots herself in grief-driven denial trying to prove that Kouda isn't a Vector. She doesn't revive.
- Nice Girl: A sweet, caring young woman with an Adorkable streak.
- Sacrificial Lamb: She dies at the end of the first chapter, just before the Time Skip to Kenzaki's promotion.