Voiced by: Asami Sanada (JP), Kelly Ray (EN)
- Abusive Parents: Her mother treats her very coldly, tending to chastise her for her poor grades. She also apparently tried to strangle her to death in the past, blaming her for the death of Shiina's older sister Mishou. Yeah, Shiina has mommy issues.
- Book Dumb: She's way more interested in sports and cooking than studying, and it shows. Subverted, though, when she manages to get a scholarship for the incredibly exclusive Banda Academy.
- Break the Cutie: Goes through this throughout the whole series, culminating in her crossing the Despair Event Horizon and bringing about The End of the World as We Know It alongside Mamiko.
- Celibate Heroine: Despite her young age, she's already adamant that she'll never get married or have kids. Eventually subverted in the manga; she gradually develops feelings for Takeo and even has sex with him near the end, with their daughter going on to be the new Eve of the "cleansed" Earth.
- Decoy Protagonist: Seemingly played straight with her death in the manga but she gets better so this is subverted.
- Despair Event Horizon: By the final chapters, her father's dead, her mother gets shot to death right in front of her, her best friend falls out of a window in what's either a murder or suicide, her boyfriend (and father of her unborn daughter) is dead and has failed to become an Otohime, and people want her dead. Is it any wonder that she wipes out the human race after that?
- Embarrassing First Name: She makes a point of writing her first name in katakana because she hates the kanji character used for it, which means "empty husk" or "seed that shall never sprout". (It was given to her by her mother, which doesn't exactly help with her mommy issues.) It becomes a critical plot point near the end of the manga, where it turns out that the name has a positive meaning after all; Misono simply didn't want Shiina to "leave" her like Mishou did. Once Shiina comes to accept her name, she's finally able to link with her real shadow dragon... Sheol, the Earth itself.
- Expy: Effectively a genderflipped Shinji Ikari.
- Generation Xerox: In addition to having a Strong Family Resemblance to her father, the final few pages lampshade how similar the twos' lives turn out by the fact that she's started smoking.
- Genki Girl: At the start of the series, she's very cheerful.
- I Just Want to Be Special: Even though she's unable to "link" with Hoshimaru, she desperately wants to be able to control him in the same way as the other bearers. Then it turns out he isn't even hers, and she doesn't respond well. Then it turns out she's special in an entirely different way...
- Idiot Hair: Gains one of these after her Important Haircut - ironically, after she's stopped being Book Dumb!
- Important Haircut: After wearing her hair in distinctive Girlish Pigtails for half the manga (most of the anime), she gets it cut to bob length when she enters middle school.
- At the end of the manga, as the pregnant Shiina and Mamiko are the sole survivors of humanity, Shiina has let her hair grow to her shoulders.
- Leeroy Jenkins: Borders on this at times.
- Messianic Archetype: Is introduced as an emotionally strong, kind, and courageous young woman, though she truly comes into this trope by volume 7 where she sustains injury in order to protect Hiro's would-be victims and later by creating the new world.
- Misanthrope Supreme: Losing her parents, her friends, and her lover – most of whom are killed by a mob that plans to gun for her next – brings Shiina to Shinji levels of despair and causes her to annihilate humanity.
- Naïve Everygirl: She starts as one of these. Needless to say, she doesn't stay that way...
- No Periods, Period: Averted, she gets her first period right after being brought back to life.
- Scars Are Forever: After getting stabbed through her left hand during the whole mess with Oni, she has a fairly conspicuous little scar there for the rest of the manga. Even when she dies and comes back to life, it's still there.
- Scholarship Student: In the second half of the manga. Other characters comment that she's the first girl in over fourteen years to get a scholarship into Banda.
- Tomboy and Girly Girl: The tomboy to Akira and Hiroko's girly-girls.
- Woobie, Destroyer of Worlds: Turns into this by the end of the manga.
- You Gotta Have Blue Hair: Her hair is blue.
Voiced by: Mamiko Noto (JP) Renee Gloger (EN)
- Abusive Parents: Her father, who is implied to have molested her in the past. Dialogue from the first volume also suggests he may have physically abused her as well.
- Armor-Piercing Slap: To Shiina, near the end of the manga.
- Beware the Nice Ones: While she's usually characterised as hating the idea of hurting others, her manner of Calling the Old Man Out makes her qualify. Also, early on, there's a blink-and-you'll-miss-it implication that she might have tried to kill Ain-Soph before; note how she already knows that Shiina won't be able to do much of anything to Push Dagger.
- Break the Cutie: She was broken before we even meet her in-series, and she breaks further as the story progresses.
- Calling the Old Man Out: By stabbing him to death.
- Cute Clumsy Girl: Akira is shown to be on the clumsy side when she's helping out at her parents' restaurant. It isn't played for laughs.
- Driven to Suicide: She makes at least two attempts on her own life in the series, but either can't bring herself to go through with it or is stopped by other characters. Whether or not her death in the final chapter is a suicide is up for debate, as it's left ambiguous as to whether she threw herself out or was pushed out by an unknown assailant.
- Expository Hairstyle Change: Her hair slowly grows back out in later manga volumes.
- Get a Hold of Yourself, Man!: Lt. Watanabe, a minor character and soldier of the Japanese Special Defence Force, pulls this on her when she grabs his gun and tries to kill herself with it. In the final volume, Akira herself pulls it on a BSOD-ing Shiina, reminding her that she still has family and urging her to patch things up with her mother.
- Hates Being Touched: By her father, specifically. When he puts a hand on her shoulder after the East Fuji incident, she shrieks and swats it away. Who can blame her?
- I Just Want to Be Normal: In direct contrast with Shiina. Akira hates her connection with Ain-Soph because it's given her recurring nightmares in which she's falling - plus when she first "linked" with it, the feeling of flying having had made her sick.
- Important Haircut: Akira chops off her own hair soon after Komori tells her it's beautiful (while creeping her out in general), which makes this case almost border on Traumatic Haircut.
- Nervous Wreck: Her general disposition. She's even anxious around her friends.
- Nice Girl: Polite and of a gentle nature, in a sharp, sharp contrast to just about everyone else.
- Parental Incest: Strongly implied to have been a victim of this. And her dad wonders why she isn't the cheerful girl she used to be as a child.
- Rei Ayanami Expy: Not as much as Mamiko, but with her blue hair, social isolation and repeated suicide attempts, she's not too dissimilar from Rei.
- Self-Made Orphan: Kills her physically and sexually abusive father, resulting in her incarceration in a juvenile detention center.
- Scars Are Forever: Akira has scars on her left wrist from past suicide attempts, which are seen several times in the manga. In the anime, the scars are never shown on-screen, but they're implied to be there.
- Shrinking Violet: An extremely tragic example, if not one of the most tragic examples in all of fiction. Extremely clumsy, withdrawn, and terrified of showing her feelings to others, and in absolutely no way is it played for humor or for moe points.
- The Stoic: Being a Nervous Wreck aside, she keeps her feelings to herself.
- Thousand Origami Cranes: She shuts herself in her room to make these following the East Fuji incident, where she witnessed the deaths of hundreds of soldiers.
- Trauma Conga Line: Things were already very poor for Akira by the time the story had started; she was not attending school regularly, had no friends, and is highly implied to self harm. The story being the story it is, things get worse for everyone, especially her.
Voiced by: Akira Ishida (JP)
"Cut yourself to fit the world? Or cut the world to fit you?"
- Beware the Nice Ones: Apparently, he was known to his neighbourhood and school as a friendly and polite (albeit sickly) boy who was popular with girls and wanted to become a doctor. None of them knew of his true intentions, of course.
- Even Bad Men Love Their Mamas: Subverted. Not too long after his death, it's revealed that he had an invalid mother he was taking care of; however, the reader already knows by then that the weak and sickly were among the sorts of people he wanted to kill off.
- Fate Worse than Death: In the manga. It's eventually revealed that after he died, he was found by government agents just when Push Dagger was beginning to absorb his body in order to transform him into an Otohime. When Sudo takes Akira to see what's become of him, Komori's half-transformed body is hooked up to machines that slow down the process of becoming an Otohime, effectively keeping him from either fully dying or being reborn. It ain't pretty.
- Hoist by His Own Petard: In the anime, as a result of a few things being switched around. Rather than being run through with a broken plane strut, Hoshimaru replicates Komori's own Push Dagger and spears him with it.
- Knife Nut: As well as his Mon being shaped like a knife, he's always carrying a dagger with him.
- Social Darwinist: Not content with wanting to kill off five billion people, the next part of his plan for the world involves testing what's left of the human population for "physical endurance".
- Utopia Justifies the Means: It says a lot that his idea of "utopia" involves turning society back to the Stone Age...
- We Can Rule Together: Komori tries this on Akira, saying that he'll be the king and she'll be the queen of his ideal world; it doesn't actually work, but it does leave a very strong impression on her that influences some of her later actions.
Hiroko Kaizuka (a.k.a. "Hiro-chan")
Voiced by: Sakura Nogawa (JP), Flora Stanberg (EN)
"You can't save everybody with kindness."
- Abusive Parents: Her father berates her for getting anything less than 100% on tests and disapproves of her friendship with Shiina, saying that the other girl is a "bad influence" on her. While her mother isn't shown abusing her in the same way, she doesn't seem to be very supportive of her either.
- All of the Other Reindeer: She's relentlessly bullied solely because of her grades and being a model student in general.
- Beware the Nice Ones: She's the nicest character, but also has the second highest observed body count.
- Despair Event Horizon: As if being raped by Aki Honda and the other bullies didn't break her enough, she goes irreversably over the edge when her father tries to cut off all ties between her and Shiina. Naturally, he ends up being her first kill.
- Dull Eyes of Unhappiness: In the anime, after Hoshimaru kills her.
- Famous Last Words: "Shiina, you can't save everybody with kindness. Say goodbye to your father."
- Girlish Pigtails: Her braids.
- Intelligence Equals Isolation: She flat-out admits that Shiina is her only real friend...
- Lonely Rich Kid: And her parents don't even want her being friends with Shiina.
- Nice Girl: She is one of the nicer characters in the cast, if not the most.
- The Ojou: A young, light-haired example, complete with Big Fancy House.
- Rape as Drama: She's sodomized with a test tube, no less!
- Roaring Rampage of Revenge: Played with. Her use of Oni is unmistakably violent and angry, yet when Shiina confronts her in person, she's eerily calm even while she's having Oni torture Shiina's dad.
- Self-Made Orphan: When she goes mad and begins to use Oni, her parents are the very first people she kills. When Shiina arrives to her home, she finds Hiro-chan hugging her father's lifeless body which sits on his favorite couch.
- Shrinking Violet: More of a passive, modest example than the actively self-isolating and wary Akira, but she's quite lonely and thinks poorly of herself.
- We Can Rule Together: Sort-of tries this on Shiina when confronted by her. It doesn't go well.
- With Great Power Comes Great Insanity: Inverted; it's her descent into madness that "activates" Oni.
- Yandere: As a side effect of Break the Cutie. Besides killing everyone who ever abused her, Hiro-chan also tries to eliminate anything and anyone she believes to be an obstacle to her and Shiina's friendship... even if that means trying to kill Shiina's father.
Voiced by: Kaori Tanaka (JP), Renee Goldstein (EN)
- Affably Evil: She's hard to dislike despite her very callous actions, in part due to her own suffering.
- Adaptation Dye-Job: She's got green hair in the anime, as opposed to the black hair she has in the manga.
- Armor-Piercing Slap: Delivers one of these to Shiina as soon as they meet. She also does this to Bungo at least once.
- Berserk Button: She won't stand to have her pride bruised. Dare to insinuate that she's weak, and she will try to prove otherwise; sadly for her, she won't necessarily succeed...
- Break the Haughty: Eventually, in the manga, after one too many failures. Her defeat at the hands of the Otohime (Mishou) leaves her so shattered that she pretty much gives up on fighting, instead choosing to stay by Bungo's side. If the manga had a bigger fandom, she'd probably be accused of Chickification... even though her inability to be a strong as she'd like is one of the biggest themes surrounding her character.
- Bring My Brown Pants: Wets herself when Amaborea is cut by a Helicopter Blender.
- Can't Catch Up: This is basically the core of her issues.
- Disproportionate Retribution: The murderous grudge she gets against Shiina started just because the kid made fun of the name of her school.
- He Is Not My Boyfriend: She often denies that she has any feelings for Bungo anymore. Even thirteen-year-olds aren't convinced by that.
- Purple Eyes: In the anime. On the manga covers she appears on, they're closer to grey.
- Rich Bitch: She certainly has the attitude of one of these. Subverted, as she's not actually rich at all.
- Well, Excuse Me, Princess!: Tends to sum up her relationship with Bungo for most of the series...
Voiced by: Hisayoshi Suganuma (JP), Frankie Rome (EN)
- Beware the Nice Ones: One moment, he's good-naturedly offering Shiina a tissue for her bloody nose and apologising for Satomi's behaviour; next, his Mon is blowing up planes like it's a game.
- Dub Name Change: The Dark Horse release of the manga calls him Kazuyuki, due to "Bungo" sounding rather strange to foreign ears.
- Expository Hairstyle Change: He bleaches his hair fairly early on, and starts slicking it back after the manga's halfway point.
- Gatling Good: He likes to have Hainuwele equip high-power vulcans, perfect for shooting down fighter jets and attack choppers.
- Macross Missile Massacre: His second favorite attack is to use rocket nests.
- Otaku: He's a military nut, and fairly knowledgable about different kinds of guns.
Voiced by: Hideki Tasaka (JP)
"Divide a single slice of bread equally between ten people and ten people starve."
- Asexuality: He flat-out states that human sexuality is of no concern to him.
- Beware the Nice Ones: He might seem pleasant enough to people meeting him for the first time, and he's known to his school as a particularly bright student, but aside from that, he's creepy.
- Creepy Monotone: In the anime.
- Disproportionate Retribution: In the manga, he shoots two delinquents to death just for throwing a bag of trash into a river.
- Misanthrope Supreme: In order to build his ideal world, he commandeers a missile silo and launches nukes at the world's major cities and volcanoes, intending to wipe out humanity with a nuclear winter.
- Parental Abandonment: His parents and older brother are "missing", though it's never really explained what happened to them.
- Self-Made Orphan: It's suggested at one point that Sudo himself may have been responsible for his family's "disappearance".
- We Can Rule Together: Rather fond of siccing this on Akira.
Voiced by: Eiji Miyashita (JP)
- All Girls Want Bad Boys: Very popular with the ladies, despite his attitude. Then there's the fact that Shiina eventually falls for him...
- Anti-Hero: He's basically on Shiina's side, but his jerkishness (and the series' Black and Gray Morality) makes it difficult to really class him as a hero.
- Badass Normal: Even without a shadow dragon, he's not afraid of heading onto the field in dangerous situations. Subverted when it's revealed he's been in control of a dragon - namely, Hoshimaru - since at least the start of the manga.
- The Casanova: A somewhat twisted case in that to him, it's all about reproduction; as a result of that, he's gotten more than a few girls pregnant and already has about five kids. It takes a loooong time for him to learn that there's a difference between love and procreation.
- Death by Sex: He and Shiina have sex in the penultimate chapter. He dies after that.
- Dropped a Bridge on Him: Shiina finds him dead in his hideout in the final chapter; how he died is never shown, though it's made obvious that he was killed by the same angry mob that's after Shiina.
- Even the Guys Want Him: Norio's secretly in love with him, too.
- Jerk Ass: He can be quite a douchebag, especially towards his "girlfriends" and one girl (Kaori) he rescues as part of a job. He eventually gets better in the manga, though only after losing both the people he cared most about, and being caught in a nuclear explosion and suffering the effects of radiation poisioning.
- Lennon Specs: Wears these towards the end of the manga. Specifically, after he's gone bald from radiation poisoning.
- Made of Iron: In the manga, he can apparently take a point-blank shotgun wound to the chest and barely even flinch.
- Manipulative Bastard: He has a tendency to withhold important information from Shiina, which usually forces her to find it out the hard way. He also chooses the worst possible time to reveal to her that Hoshimaru is actually his shadow dragon. She doesn't take it well at all.
- Vitriolic Best Buds: With Norio.
Voiced by: Kouki Akaishi (JP), Jamie McGonnigal (EN)
- Cruel and Unusual Death: He gets one of the nastiest deaths in the whole manga. To elaborate, he gets crippled by having a tendon sliced in his leg, raped, eviscerated, possibly castrated as well... and when he's about to die from all that, he's drugged up and effectively brought back to "life" for a few more painful moments. All of this is done by a gang of monstrous city thugs who had no reason other than the fact that Norio was there and Takeo wasn't.
- Creepy Doll: Norio's hobby is creating dolls and puppets based on shadow dragons. Needless to say they're all kind of creepy.
- Dead Guy on Display: After poor Norio succumbs to the aforementioned Cruel and Unusual Death, his head is cut off and mounted on one of the creepy dolls, then hung on the wall of Takeo's house. Understandably, when he and Shiina's parents step in and see this, neither takes it well.
- Deadpan Snarker: While rude and flippant, he's a more agreeable example.
- Determinator: He'll go to any length to protect Takeo, no matter what the cost.
- Dude Looks Like a Lady: Nearly every character who interacts with him in the manga mistakes him for a girl at first.
- Dying Moment of Awesome:
- Though not necessarily for Norio, Vagina Dentata's last act is to 'transform' into a winged variant of itself and sprouting a human fetus and wings... which also destroys the final bomber attacking Tarrasque.
- Though he qualifies here as well because he manages to stay mostly calm when being given a Cruel and Unusual Death.
- Effeminate Misogynistic Guy: He doesn't really seem to like women all that much. See his shadow dragon? The one with a toothy vagina for a head? He calls it Vagina Dentata, as if to say "This is what I think of you." Further, while he's rather fruity, when he has to disguise himself as a girl, he's pissed.
- Famous Last Words: "I... I can't tell you... anymore..."
- Go Out with a Smile: Played with. His dying smile is ironic because he's regretting that he could never tell Takeo his real feelings (though one could also see it as a neat "fuck you, you couldn't break me" to his killers). Also, he's definitely not smiling when Takeo comes home to find his severed head.
- Heroic Sacrifice: He dies a very gruesome death in aiding Tsurumaru, Shiina and Jane Franklin, managing to disable all of the bombers that are targeting Tarrasque... but subverted when Robert Franklin ends up dying anyway and Shiina gets offed only a few strips later.
- Hope Spot: Now, if Norio can just deal with the bombers quickly and send Vagina Dentata back to deal with these thugs, he can make it.
- In-Series Nickname: He's called "Nori-rin" by one of Takeo's ex-girlfriends. (Fun fact: One of Kitoh's latest manga, currently running in Kodansha's Evening magazine, is called Noririn. It's a cycling manga that takes its title from its own two protagonists, so the name is probably a coincidence.)
- Incompatible Orientation: It sure sucks to be in love with a straight guy who isn't interested in anything he can't make babies with.
- Mr. Seahorse: No, no, he doesn't actually get pregnant! It's just that his deepest, most secret wish is to bear Takeo's child. When he's about to die, his wish is symbolized by Vagina Dentata "evolving" into a form that resembles a winged, toothy womb with a human foetus inside.
- Off with His Head!: As if his actual murder wasn't horrible enough already, his killers cut his head off his corpse and mount it onto one of his own dolls for Takeo to come home to.
- The Runaway: It's hinted that he had issues with his family that led to him running away from home, but nothing is explained in detail.
- Stun Gun: Norio, disguised as a Banda student ends up taser-ing Satomi when Vagina Dentata fails to subdue Amapola.
- Vitriolic Best Buds: With Takeo, as already mentioned.
- Wholesome Crossdresser: His taste in clothes tends to be rather feminine. Funnily enough, when he has to actually disguise himself as a girl for a mission, he complains like hell.
Voiced by: Satsuki Yukino (JP)
- Ambiguously Human: Is highly implied to have been created by the Earth itself to guide Shiina into awakening to her dragon.
- Creepy Child: In a series full of kooky kids, her otherworldly stoicism stands out. She's also weirdly knowledgable about other people, which creeps Bungo out.
- Defrosting Ice Queen / Sugar-and-Ice Personality: Over time she becomes quite close to Shiina. The two even go for a bike ride and have lunch together late in the story.
- Demoted to Extra: Barely appears in the anime and doesn't even get to be in the ED animation, despite being critically important in the manga.
- Does Not Like Shoes: Footwear seems to be her second least favourite type in clothing aside from panties, given that she only wears shoes in all of two appearances.
- Fan Disservice: At first appears to be the sole purpose of her character. She doesn't evolve far from it.
- Emotionless Girl: Apathy and cynicism are about the extent of her emotional range.
- Full-Frontal Assault: When she finally gains control of her shadow dragon Sheol, she goes on her first killing spree while half-naked. Her targets in this case? The thugs who'd just raped her.
- Flat Character: Zigzagged. She's this for about 9 volumes, only ever appearing to creep her allies and enemies alike out and confuse people by waxing philosophical. She's arguably the most important character in the final 3 volumes, however.
- Going Commando: Mamiko never wears panties, and has no qualms about proving this fact to Bungo when he first sees her wearing clothes at all.
- Heel–Face Turn: Is at first Sudo's Token Evil Teammate who is only part of their scheme for her own amusement, as opposed to attempting to improve the world, though she eventually finds herself Intrigued by Humanity and convinces Shiina to give the world another chance after she destroys it.
- Innocent Fanservice Girl: Though "innocent" and "fanservice" aren't really the right words to use for her. In any case, she prefers to go around naked if she can, and even when she does wear clothing, it's usually just a flimsy dress.
- Little Miss Badass: It's best to not mess with her, otherwise she will take care of you calmly and efficiently - and turn you into a gory mess while she's at it.
- Naked on Arrival: Much to the shock of Bungo and Satomi (to say nothing of unsuspecting readers).
- Physical God: Becomes this after awakening to Sheol. It's even implied that she resurrected Shiina after she was fatally struck by a missile by simply creating her another body and washing it up on a shore by her grandparents' home.
- Please Put Some Clothes On: How people tend to react to her.
- Rei Ayanami Expy: Downplayed somewhat, but she fits a few of the criteria. Arguably played straight with the revelation that she and Shiina are destined to recreate the world.
Voiced by: Kahoru Sasajima (JP)
- Alpha Bitch: She dominates four other girls (in the case of one, through fear) and leads them as they bully Hiroko to horrifying levels.
- Break the Haughty: At the hands of the very cutie she broke, at that.
- Brother–Sister Incest: Has this sort of relationship with her older brother Yasuhito.
- Driven by Envy: The other reason? She's envious of Hiroko's brilliant grades.
- For the Evulz: Why does she treat Hiroko so horribly? Because she can, pretty much.
- Girl Posse: Consisting of Mihaya Ozaki, Hiroka Takamura, and Miyoko Shitou. Out of all of them, Miyoko is the only one who ever shows reluctance and remorse for their actions against Hiroko. She's also the only one who doesn't get killed by Hiroko's Mon, albeit only thanks to Shiina's intervention.
- Half the Man He Used to Be: Her final fate in the manga. The page showing this, which includes some downright disturbing Fan Disservice, was completely cut out of Dark Horse's release of the English translation.
- Karmic Death: She is killed by Hiroko's shadow dragon Oni in a way that mirrors her own torture methods. It speaks volumes about the series' Crapsack World when death by claw rape can be described as "karmic".
- Meaningful Name: "Aki" sounds similar to the Japanese word aku, which means "evil". How accurate.
Aki's posse (Mihaya Ohzaki, Hiroka Takamura, Miyoko Shitou)
- Anti-Villain: Miyoko is the only one of these girls who shows anything similar to human decency.
- Beta Bitch: Mihaya seems to be second in command.
- Big "NO!": In the anime, Hiroka lets several of these before she's thrown out of a window to her death by Oni.
- Cassandra Truth: Miyoko is the first one to realize that Hiroko was somehow behind the deaths of Mihaya and Aki, but when she tries to imply it during her "public confession", no one believes her... until Oni shows up.
- Fat Bastard: Hiroka was noticeably chubbier than the other girls. Considering this is a Mohiro Kito manga, that puts her up to only slightly underweight by most peoples standards.
- Even Evil Has Standards: All three of them are horrified when Aki explains what she plans to do to Hiroko.
- Girl Posse: A group of bullies under Aki.
- Heel–Face Door-Slam: Mihaya shows signs of remorse for her involvement in the test tube incident seconds before getting splattered by Oni.
- Jerk Ass: Mihaya and Hiroka, who simply can't rival Aki's over-the-top cruelty.
- Karmic Death: Dealt to them by Oni. Mihaya is almost as bad as Aki? She gets splattered in a dark alley, her remains almost unrecognizable. Hiroka is a mere thug? Oni throws her out of the window in front of the whole class. Miyoko is the only one who repents? Shiina manages to save her life, but Oni still breaks her arm and rips off one of her legs.
- Nervous Wreck: Miyoko, specially right before she almost dies at Oni's hands.
- Peer Pressure Makes You Evil: They mainly go along with Aki's cruelty out of fear. Special mention goes to Miyoko, who gets beaten up when she's late for the test tube incident.
- Satellite Character: Their motivations are all centered on Aki's actions.
- Sole Survivor: Miyoko is the only one to not be killed by Oni, but only because of Shiina's intervention. Even then, she's not completely unscathed, having her arm broken and one of her legs ripped off.
- Tears of Fear: Miyoko, when she explains to the whole class what happened with Hiroko.
- Big Sister Instinct: As a Virgin Princess, she pulls more than one Big Damn Heroes to protect her little sister.
- Driven to Suicide: Subverted. While she is found alone and in a pool of her own blood, the injuries she has were apparently done after she was dead.
- Emotionless Girl: Later, as the Virgin Princess
- Facial Markings: As the Virgin Princess
- Genki Girl: At first. By the time Shiina is born, however, she's fallen into depression.
- Sailor Fuku: Is seen wearing one.
Shiina's parents (Shunji and Misono Tamai)
Voiced by: Nobuo Tobita and Chizuru Fuyuki (JP), Josh Mosby and Erica Schroeder (EN)
- Abusive Parents: Shunji is an okay guy, but Misono is very cold and strict to Shiina.
- Despair Event Horizon: What made Misono so abusive to Shiina was how her birth and Mishou's death basically overlapped together. Since Misono went off the deep end when Mishou died, guess what happened.
- Heel–Face Door-Slam: Right after Misono and Shiina rekindle their bond, Misono is killed by a mob.
- Heroic Sacrifice: Shunji uses his plane to kill off Bungo's dragonet.
- Kick the Dog: Misono trying to strangle the infant Shiina while despairing for Mishou's loss.
- Parents as People: Shunji is a good guy, but he can barely stay by Shiina when she needs it; nevertheless, he still tries to do what he can for her.
Voiced by: Hikaru Tokita (JP), Stephanie Boyle (EN)
- Action Survivor: Graduates to this when he tries to help Shiina as Oni first kills Hiroka and then attacks, mutilates and almost kills Miyoko
- Demoted to Extra: In the anime, he shows up out of the blue to help Hiroko after the test tube incident, without any explanation of why he knew to be there, or even who he is. In the manga, however, he was Shiina's Childhood Friend and showed up once in a while weven after the Time Skip.
Voiced by: Yuuki Tai (JP), David Moo (EN)
- Childhood Friends: Seems to be this with Akira.
- Dogged Nice Guy: He also has a crush on her, seemingly for quite a while.
- Sex as a Rite-of-Passage: Averted: Akira asked Ishida to have sex with her, but he panicked and ran away. He later berated himself for not taking up her offer, while she masturbates loudly.