%%Use of the term loli is 100% appropriate for this page.
%%Also, offficial spelling is Rentaro, not Rintaro.
The character page for the light novel, manga, and anime series ''LightNovel/BlackBullet''. Lots of marked and unmarked spoilers ahead. You have been warned.

[[folder:Tendo Civil Security]]
!!Rentaro Satomi
!!!'''Voiced by:''' Creator/YuukiKaji (Japanese), Creator/ChrisPatton (English)
[[caption-width-right:225:[[SeanConneryIsAboutToShootYou Rentaro is about to shoot a Gastrea]].]]
The main 16-year-old protagonist of Black Bullet and Enju's promoter of Tendo Civil Security.
* TheAce: In the anime, Rentaro is portrayed as a near-flawless protagonist who possesses many skills and abilities. He's still portrayed as a PragmaticHero though.
* AlmightyJanitor: His IP ranking is recorded to be relatively low, yet he's a competent fighter himself. [[spoiler:Eventually, his IP ranking was raised to 300 after the events of volume 2 and after the battle against Aldebaran's army it was raised to 210.]]
* ArtificialLimbs: He lost his right leg, right arm, and his left eye protecting Kisara from the Gastrea when they were children and took part of the "New Human Creation Plan" to save his own life.
* AwesomeByAnalysis: He's fairly intelligent, and can deduce some things based on the evidence he sees, [[spoiler:such as figuring out Tina isn't entirely evil because she didn't kill the police officer or Enju despite clearly having the ability to do so.]]
* BadassNormal: He doesn't have any special powers, yet he is capable of engaging the Gastrea pretty effectively.
** EmpoweredBadassNormal: Thanks to the ArtificialLimbs he has, his physical prowess is on a superhuman level.
* BadassTransplant: His artificial left eye grants him ImprobableAimingSkills, and his Super Varanium right arm contributes to the downfall of Scorpio.
* BerserkButton: Don't try to make [[FragileFlower Enju]] [[spoiler:or Tina]] sad or badmouth about her...[[BigBrotherInstinct just]] [[ForHappiness don't]].
** For that matter, any attempts to hurt a Cursed Child will garner this reaction.
* [[spoiler:BeYourself[=/=]IAmWhatIAm: This is how Kisara and Rentaro ended up as an OfficialCouple at the end of volume 6, as well as how the relationship conflict with Kisara was resolved during Rentaro's time as a fugitive. While they both don't agree with each other in terms of their ethics; they respect each other as who they are and their reason of existence, and do not wish to change each other's ways.]]
* BigBrotherInstinct: Well, [[BadassAdorable Enju is capable of fending off the Gastrea and other threats by herself]], but he is ''very'' protective of Enju's physical, emotional, and mental well-being. [[spoiler:Case in point, he gets really defensive when everyone in the school Enju's attends to found out her cursed child status and even tries to search for her when Enju didn't come back home from school.]]
** He also shows shades of this towards [[spoiler: Tina]] and other Cursed Children.
** KnightTemplarBigBrother: There are very strong hints of this trope during the Fugitive arch. [[spoiler:Volume 5 even states that Enju has become his ''obsession''.]]
* BigBrotherMentor: Serves this role to Enju Aihara.
* {{Bishonen}}: His anime design.
* BornLucky: Described as this by many characters.
* BreakTheBadass: Honestly, the author figures out a way to break Rentaro down mentally and emotionally in every volume.
* ChickMagnet: Not only that, he also happens to be attractive to the cursed children as well, so he's accused of being a bit of a {{Lolicon}} by some of the other characters.
* ChildhoodFriendRomance: To Kisara.
* DangerousForbiddenTechnique: [[spoiler: During the mission to retrieve the Inheritance of the Seven Stars from the Hiruko pair, he injects himself with a specialized strain of the Gastrea Virus in order to even further increase the superhuman capabilities he'd gained from his modified ArtificialLimbs.]]
* DeadpanSnarker: Has shades of this, particularly with Enju's unrealistic fantasies such as their romantic relationship.
* {{Determinator}}: He has surprisingly strong willpower [[spoiler: to the point where he simply ''doesn't'' die. [[NoOneShouldSurviveThat Heck, he even survived getting rapidly impaled by Kohina's katanas, getting shot repeatedly by Hiruko and falling down a ravine into a river below]] due to his sheer determination to live]].
* EmoTeen: Let's just say that when someone he cares about dies, he goes into a strong moment of angst. [[spoiler:He even thought of committing suicide when he thought Enju was killed off by Tina Sprout.]]
* FatalFlaw: [[spoiler:The very fact that he refuses to see anyone suffering is one of the biggest flaws of his utilitarian ethics, so he decided to take the emotional burden rather than letting Kisara, Enju, and Tina put up with the pain. Apparently, this only made him cause ''more'' suffering instead of bringing happiness to others, as he has to learn this the hard way in volumes 5 and 6 after he got arrested, with Kisara being forced to marry her former boyfriend, Enju being taken away and forced to pair with a total stranger, and Tina being executed for a crime she didn't commit.]]
* FieldPromotion: He's given the rank of 300 by Seitenshi in episode 7 [[note]] Kisara mentioned he and Enju were ranked about 120,000 out of 700k in episode 2[[/note]], which allows him to outrank Takuto, one of her bodyguards, and allows him access to some higher level secret documents she has.
* ForHappiness: Rentaro follows a strict utilitarian ethics where he wants everyone in his life (''especially'' [[NiceGirl En]][[AllLovingHero ju]] and [[FriendlySniper Tina]]) to be happy, but he doesn't want people around him to suffer. [[spoiler:This is deconstructed in the [[TraumaCongaLine Fugitve arch]] where he is willing to sacrifice his own happiness and freedom for Enju's, Tina's, and Kisara's happiness, but it end up backfiring where everyone ''suffered'' instead.]]
* FriendToAllChildren: The reason he's well-liked among the cursed children. He does not see them as vermin, but rather as equals and treats them with kindness. This is also one of the main reasons why he is able to maintain a good LikeBrotherAndSister relationship with Enju [[spoiler:and Tina]] as well as bringing the happiness into their lives they never had.
* TheGunslinger: Uses a XD pistol to combat the Gastrea.
** GunsAkimbo: He dual wields pistols in episode 7 during an evaluation by Miori.
** GunFu: Incoprorates the Tendo style martial arts along with his gun usage.
* [[spoiler: HeroicBSOD: He doesn't take it lightly when he has to MercyKill Kayo and fears the same fate will happen with Enju. Also had another one in volume 2 when he thought Enju was killed off by Tina Sprout ([[SubvertedTrope which surprisingly, Tina spared her life instead]], albeit severely injured)]].
* HatesBeingAlone: Much like Enju, Rentaro cannot imagine his life without Enju, Tina, and Kisara in his life. Not to mention, he brought [[ForHappiness happiness]] to the said characters' lives and in return, they made him feel like he belonged there.
* TheHero
* HumansAreFlawed: Has this viewpoint on humanity. While he acknowledges the reality that humanity [[FantasticRacism has done very horrible things]] towards the cursed children, he still has faith that there is a good side in being a human and hopes that humanity can accept cursed children as humans.
* IAmNotLeftHanded: During his second fight with Kagetane, he reveals a trump card he's been hiding up till that point. [[spoiler:His right arm and leg, along with his left eye, are cybernetic implants just like Kagetane has. Said right arm also becomes incredibly useful against the Stage 5 Gastrea that shows up after he defeats Kagetane.]]
* ImprobableAimingSkills: He can hit targets rather far away with just a pistol. Justified however, in that his cybernetic eye allows him to have really good aim.
* IWantMyBelovedToBeHappy: [[spoiler:Is this towards Kisara and Enju. At least in Enju's case, he wants her to live her remaining 500 days in a happy life. Deconstructed with Kisara in the Fugitive arch.]]
* KnightInSourArmor: [[spoiler:Well yeah, he's a good guy at heart, but he is more than willing to use lethal force if it means protecting people he cares about, and has a [[PragmaticHero pragmatic]] approach on things. He even supposedly ''killed'' Kagetane.]]
* LetsGetDangerous: He generally prefers a move civilized resolution to most of the non-Gastrea problems. Unfortunately the antagonists he's up against generally don't want to talk or side with him, forcing him to have to kick their butts.
** In addition to that, Rentaro generally never goes all out in a fight unless he's ordered to execute the target. This means that unless part of his orders, Rentaro is not going to fight to win.
* MadeOfIron: He remains standing and ''combative'' despite [[spoiler: being shot three times, hit with a "Maximum Pain" attack, and stabbed through the gut with dual swords, ''multiple times!''.]]
* ManlyTears: He has his fair share of these moments.
* MercyKill: [[spoiler:Had to perform this on Kayo Senju when her Gastrea virus exceeded critical value. [[HeroicBSOD He does not take this well at all]].]]
* MistakenForPedophile: Due to working with Enju, he's constantly accused of being a {{Lolicon}}. And when he tries to deny it, no one really [[CassandraTruth believes him.]] Naturally this is also the first thing the cursed children in episode 8 ask him when he's trying to teach them at a school he set up with Kisara. Sumire also teases him about this to Tina in episode 9, stating that he's trying to start a harem of lolis.
* MyGodWhatHaveIDone: In volume 5, [[spoiler:after rejecting Kisara's help to get him out of jail and telling her to find happiness, he later finds out that his Promotor licensed got revoked, and that Enju has been taken away and forced to pair up with a Promotor named "buddy killer," and Tina was about to be executed for a crime she didn't commit.]]
* TheNeedsOfTheMany: See ForHappiness above.
* NiceGuy: He's willing to help others in need when necessary.
* ObliviousToLove: For the most part. He does seem to have an interest in Kisara, but never makes a move on her. Sumire teases him about it, and wonders how Kisara is still single.
** However, its more of a case of SingleTargetSexuality mixed with SelectiveObliviousness, as he is aware that Enju has feelings for him, but ignores it, and he only has feelings for Kisara.
* [[spoiler:OfficialCouple: With Kisara after volume 6.]]
* PleaseDontLeaveMe: A slight variation of this trope at the anime finale.
-->[[spoiler:'''Rentaro''': I’m afraid, I’m becoming unaffected by the deaths of others… Enju… Please stay by my side, always…Don’t let me go…..”]]
* PragmaticHero: While he is a good person at heart, he takes a more rational and realistic approach on things, dealing with problems without going into the AntiHero category. [[spoiler:He's even ''willing to use lethal force'' against Kagetane as well.]]
** He also prevents Enju from saving a cursed child who stole some food, noting that such action would have resulted in a negative outcome between him and Enju.
** When Rentaro took the position as commander [[spoiler:after Gado was killed off]], a fellow civil security officer questioned him. Rentaro responded by stabbing the said civil security officer in the shoulder, hoping that other civil security officers will discard their fear and instead ''hate'' him so that the civil officers' morale will be boosted.
* RedOniBlueOni: Serves as the blue to Enju's red and red to Kisara's blue.
* SecondYearProtagonist
* ScrewTheMoneyIHaveRules: Kagetane attempted to bribe Rentaro with a suitcase filled with cash in order to get him out of poverty and join his evil cause, Rentaro responded by shooting at the suitcase.
* SuperSoldier: As a result of the New Human Creation Plan that gave him ArtificialLimbs, since the project's original purpose was to craft mechanical soldiers to combat the Gastrea before it got shut down.
* {{Tsundere}}: A male and subtle example. He feels really uneasy when Enju tries to make romantic moves on him, noting [[{{Lolicon}} how wrong]] [[CrowningMomentOfFunny this kind of relationship would be]].
* TsurimeEyes
* UnwantedHarem: Enju, Tina, and the group of Cursed Children he tries to teach all want to marry him.
* WakeUpGoToSchoolSaveTheWorld: A student of Magata High School who fights to protect the world from the Gastrea threat.
* WhatMeasureIsANonhuman: Averted. While most people typically see Cursed children as an annoyance, if not a threat, he tries to treat them like normal humans. Unsurprisingly, this makes him more likable to those girls.
* WhatTheHellHero: Enju asks why Rentaro didn't do anything for the Cursed Child caught stealing food in episode 2. And when she tried to reach out to Enju, he stopped her. She then asks if he's supposed to be a protector, making him feel guilty about it, and causing him to chase after the police as a result. Although to be fair, Rentaro was [[PragmaticHero being realistic in this situation]] because all of the possible outcomes would have been bad for both him and Enju as it would have put them in a bad light, possibly even revealing Enju as a Cursed Child herself.
* TheWorfEffect: Suffers from this when fighting against Kagetane. The latter only let him live because he felt Rentaro would be a useful ally to have. And it was only because of a risky gamble with a drug Dr. Muroto gave him that allowed him to defeat Kagetane.
* WouldHitAGirl: Well, normally he wouldn't. [[spoiler:But he's forced to during his fight with Tina due to her orders to kill Seitenshi, and for also hurting Kisara and Enju.]]
* YouGottaHaveBlueHair: In the anime.

!!Enju Aihara
!!!'''Voiced by:''' Creator/RinaHidaka (Japanese), Creator/LuciChristian (English)
[[caption-width-right:225:Our [[NiceGirl kind-hearted]] [[AllLovingHero All-Loving Heroine]]]]
A young 10-year-old cursed child and Rentaro's Model Rabbit initiator. Has severe trust issues but a friendly young girl.
* ActionGirl: Like most of the other Cursed Children, she's a very capable fighter.
* ACupAngst: She felt offended when Rentaro told her that she's flat-chested. She also tells Seitenshi in episode 5 that Rentaro doesn't look at any girls who have smaller breasts than Kisara. Justified though, she is only about ten years old.
* AdorablyPrecociousChild: Has her moments, particularly with her crush with Rentaro.
* AllLoveIsUnrequited: She has romantic feelings towards Rentaro. Rentaro [[SubvertedTrope does love Enju]], [[DoubleSubverted but]] [[LittleSisterHeroine more as a little sister]] rather than a romantic interest. [[spoiler:Besides, Rentaro has shown romantic interest towards his childhood friend, Kisara, anyways.]]
* AllLovingHero: '''One of her trademarks traits'''. [[spoiler:For example Enju is quick [[CrowningMomentofHeartwarming to forgive her classmates for their betrayal and even says she'll continue to protect them]]. She also later forgave Tina Sprout after the Assassination arch and later become one of her best friends despite the fact that Tina brutally injured her earlier.]]
* AllOfTheOtherReindeer: Her teachers and classmates in school are revolted by the discovery of her cursed status.
* AnimalMotifs: Rabbit. She even wears black hairpins with bunny designs and her GirlishPigtails somewhat resembles long rabbit ears in the manga.
* AntiquatedLinguistics: She speaks in this manner for some reason.
* BadassAdorable: She's one adorable loli that can kick Gastrea's ass.
* BadPowersGoodPeople: Who would have thought a 10-year-old loli born with the Gastrea virus in her blood can be one of the [[NiceGirl most-kindhearted]] characters?
* BecauseYouWereNiceToMe: The main reason she warmed up to Rentaro was because he tried to treat her like a normal person. In episode 2's FlashBack, she seemed quite hostile to him when they first met, but after eating some decent food he made, she starts to act less cold towards him.
* BigBrotherAttraction[=/=]BigBrotherWorship: She is very emotionally attached to Rentaro and sees him not only as an older brother figure, [[PrecociousCrush but as a romantic interest]].
* BlushSticker: Has brightly colored blushes in her face, but are more visible whenever she's happy.
* BreakTheCutie: Numerous times in this series [[spoiler:from being rejected in the school she attends to after her status as a cursed child was found out to seeing Rentaro "dying"]], you [[TheWoobie really have to feel sorry for this poor loli]]. [[spoiler:She also doesn't take it very well when she sees the bodies of all the girls that were attending the class Rentaro and Kisara were attempting to teach in episode 10.]]
* BunniesForCuteness: Enju has a rabbit theme in her character. Her Gastrea virus in her blood is not only a Rabbit Initiator, she wears black hairpins with bunny designs, her GirlishPigtails always resembles long bunny ears, her combat style specializes around kicks, and has an [[GenkiGirl energetic]] and [[NiceGirl very friendly personality]] as well.
* CheerfulChild: She always maintain a sunny disposition no matter how bad things are.
* ClingyJealousGirl:
** Is this towards Kisara in relations to Rentaro's relationship with her.
** In the first episode of the anime, at the end of one day, she asks if he wants to do anything after they're done eating at night. He says he does, and then goes to bed in his room. She immediately goes in there and beats him up for not wanting to take advantage of her.
** Later she gets upset at him for spending some time with Kayo while he attended her injuries.
** She headbutts him in the jaw after he compliments Seitenshi in episode 5 while discussing with her about what she planned to do in the future.
** In episode 9, she, along with the other people he recruited to help protect the breached monolith, interrupt a moment that he was having with Kisara. She angrily accuses him of having groped her just moments before, which he vehemently denies.
* CuteBruiser: She is quite powerful despite being really young due to the Gastrea virus inside of her.
* DarkAndTroubledPast: Volume 7 light novel reveals a lot of Enju's backstory and reveals how she developed a lot of trust issues, yet maintains a NiceGirl [[AllLovingHero All Loving Heroine]] personality. [[spoiler:Enju was adapted by the Aihara family where the former ruler of Tokyo gave money to families who raise and adapt cursed children. Unfortunately, many families only adapt the children just for the money, so the policy was abandoned. Enju happens to be one of those children and she suffered a lot of physical and emotional abuse by her foster family. This caused Enju to fought back against her foster family and ran away from home into the outer areas and committed crimes just to survive [[TechnicalPacifist minus murder]] (apparently, this caused her to be shot by the police numerous times). She joined IISO as an initiator just to have a better life.]]
* DoubleStandardAbuseFemaleOnMale: Any time she beats up Rentaro, it's seen as cute or acceptable. If the situation were reversed, he'd probably be in jail, assuming she didn't kill him first.
* ExtremityExtremist: As a 'Model Rabbit' Initiator, most of her power is in her legs and her feet - [[KickChick making kicks her main weapon]]. About the only time she throws a punch is when she'd inflicting AmusingInjuries on Rentaro.
* FieryRedhead
* FragileFlower: [[AdaptationPersonalityChange Only in the anime and manga]], she is portrayed as an emotionally sensitive loli who is prone to crying a lot when tragedy strikes her.
* GenkiGirl: Gets chipper, energetic, and happy really easily.
* GirlishPigtails
* GoodIsNotSoft: While she's a sweet, kind-hearted young girl at heart, she isn't hesitant to kick someone's ass when necessary whether if it's the Gastrea or some villain.
* HatesBeingAlone: She can't stand loneliness after being alone for most of her life. [[spoiler:You can easily imagine the emotional trauma during volumes 5 and 6 when she was forcefully taken away and separated by the IISO and forced to be paired with a total stranger named "buddy killer."]]
* TheHeart: She serves as the moral center for Tendo Civil Security company.
* HeroWithBadPublicity: Her classmates and teachers distrust her now the fact that she is a cursed child became public knowledge.
* HumansAreFlawed: Much like Rentaro, Enju holds this viewpoint. She acknowledges the harsh reality on humanity's FantasticRacism against the cursed children and feels that there is a good side in humanity and hopes humanity can accept her kind. Hence, this is one of the reasons why she continues fighting against the Gastrea, [[AllLovingHero because she loves everyone unconditionally]].
* IJustWantToHaveFriends: One of the main reasons why Enju was so hesitant in transferring schools. [[spoiler:When her status as a cursed child was found out at school, she stated that she still loves them and is willing to protect them.]]
* IncorruptiblePurePureness: Being one of the most pure hearted and most kind-hearted lolis in the series, she is not easily swayed by any form of evil manipulation such as the Hiruko pair's attempts to have Rentaro and Enju join their evil cause. [[spoiler: The only thing that is "corrupting" her is her high corrosion rate]].
* InsaneForgiveness: See AllLovingHeroine above
* JapanesePronouns: Refers to herself by the feminine pronoun ''warawa'' (妾), which is odd as it is usually used by women of noble and archaic background.
* KickChick: Most of her combat abilities involves a lot of kicking. Justified, as the boots she wears have the tip of her boots and soles made of Varanium and the fact that she's a Model Rabbit Initiator, makes kicking, jumping, and agility her speciality.
** It's also implied the reason why she only fights with her boots and kicks is because she [[TechnicalPacifist wants to fight the Gastrea without having to kill people]].
* KidHero: In contrast to Rentaro who is older then her, Enju is much younger and more of a traditional hero.
* LittleSisterHeroine: Rentaro treats Enju like a little sister to him rather than just an initiator. [[spoiler: It can also be a {{Deconstruction}} to this trope, as her PrecociousCrush not only serves an annoyance to Rentaro, but her high corrosion rate serves as an emotional burden to him as well.]]
* LockedOutOfTheLoop: At the end of episode 4, Rentaro tells her that her body corrosion rate is at 24.9%, which she mentions barely changed at all. [[spoiler: But as they walk down the street, a screen reveals her actual corrosion is at 42.1%, and she only has about 7.2% left before she succumbs to turning into a Gastrea.]]
** [[spoiler: It's also highly implied that Enju has no idea that cursed children will eventually turn into a Gastrea or die if the erosion rate is left unchecked (even though she knows the erosion rate concept).]]
* MoralityChain: She's one of the reasons why Rentaro doesn't take a darker path or fall into despair.
* NiceGirl: '''Very much so.''' No matter how much people treat her as trash, she always friendly and kind-hearted towards everyone she meets.
** To demonstrate how much of a NiceGirl Enju is[[spoiler:, after her status as a cursed child was found out in the school she attends to, [[CrowningMomentOfHeartwarming she said that no matter how much her classmates and teachers started to hate her, she will always love them and will fight for them]]]].
** In episode 7, [[spoiler: she's such a NiceGirl that she even ''forgive'' Tina and befriended her. Keep in note that Tina severely injured Enju when the later tried to fight her. It also doesn't help to note that Tina even ''spared'' Enju's life.]]
** She even help tend the wounds of many civil security officers in the episode 11[=/=]beginning of volume 4 and was given a nurse's hat for her kind efforts.
* PintSizedPowerhouse: Standing 145 cm, she's a competent fighter.
* PluckyGirl: Regardless of how poorly society treats her and other cursed children, she maintains her strong optimism no matter what happens to her.
* ThePollyanna: She's probably one of the most optimistic characters [[CrapsackWorld in a very dark world]] and is able to cope with tragedies around her easily. Sumire even mentions that Enju is mentally strong despite the abuse and trauma she received from society.
** The light novels mentions that she is emotionally strong and acts more mature than a typical 10-year-old. This is due to the abuse she has suffered when living in the Outer Districts that allowed her to be a emotionally strong and independent young girl and have a better understanding of the world around her while maintaining her optimistic beliefs at the same time.
* PowerOfTrust: One of her biggest issues is her hard time trusting others. However, she does eventually maintain a good relationship with Rentaro.
* PrecociousCrush: There are some hints of this with Rentaro.
* RapunzelHair
* [[RedOniBlueOni Red Oni]]: To Rentaro's and Tina's blue.
* SilkHidingSteel: Despite [[TenderTears her tendency to cry a lot when tragedy strikes]], Enju happens to be emotionally and mentally strong, and is [[WiseBeyondTheirYears more wiser than many 10-year-olds]].
* TaremeEyes
* TechnicalPacifist: While she's not hesitant on using brute force when fighting bad guys and the Gastrea, she absolutely refuses to kill another human being. Case in point, she's very hesitant on [[MercyKill mercy killing]] an infected man in episode 1 before the said man turned into a Gastrea.
** [[DiscussedTrope Discussed]] by [[BadassBookworm Kayo]] [[BadassAdorable Senju]] stating that Enju isn't the kind of girl who is willing to kill another human being [[spoiler:when discussing how the former was ordered by her Promotor, Shougen Ikuma, to kill a Initiator-Promotor pair because Shougen refuses to share the rewards]].
** [[spoiler:Also, her DarkAndTroubledPast while living in the outer districts shown that she had to commit various amounts of crimes just to survive. The only crime she never committed is murder.]]
* TenderTears: Prone to breaking down in tears a lot due to her [[NiceGirl kind-hearted]] and sweet sensitive nature of her personality.
** TearfulSmile: Whenever she's reunited with Rentaro and [[spoiler:in the anime finale]].
* [[spoiler:TyphoidMary: She's highly unaware that she is slowly turning into a Gastrea monster or dying.]]
* UndyingLoyalty: To Rentaro, to the point that she has PrecociousCrush moments with him.
* WideEyedIdealist: She always maintain her optimistic personality no matter how bad things are. [[spoiler:Unfortunately, she's not aware of the eventual fate she may suffer like most cursed children.]]
* [[WiseBeyondTheirYears Wise Beyond Her Years]]: In the light novels, she's portrayed to be more mature than most 10-year-old girls and an emotionally strong and independent loli.
* YouAreNotAlone: After the doctor that worked on Rentaro in the past explains to him that he at least knows where he came from, whereas Enju was abandoned and confused as to where she stands in the world, he tells Enju that even if the entire world rejected her, he would still be by her side.
** Enju pulls this trope out [[spoiler:with Rentaro]] in Episode 13 finale [[spoiler:where Enju lies on Rentaro's back when he was laying on her lap [[ManlyTears crying]]]].
-->[[spoiler:'''Enju''': "It’s all right, Rentaro. You and I will always be together, forever and ever.”]]

!!Kisara Tendo
!!!'''Voiced by:''' Creator/YuiHorie (Japanese), Christina Kelly (English)
[[caption-width-right:225:President of the Tendo Civil Security Company.]]
The president of the Tendo Civil Security Company. Her parents were killed by the Gastrea and have family issues (particularly her grandfather).
* AbsurdlySharpBlade: Her katana slices off the front end of several barrels on an assassin's gatling gun in episode 6. She also cuts through a rather large Gastrea in episode 13.
* ActionGirl: She can be an effective fighter when the situation calls for it.
* AntiHero: She's doing what is best for the Tendo Civil Security, Rentaro, and Enju. However, the fact that she holds a strong grudge against her own family and her PayEvilUntoEvil attitude makes her a flawed character. Her dark side of her anti-heroic personality is highlighted further in the anime when she ''killed'' her own brother rather than sparing his life and takes joy in killing him, thus causing Rentaro to be worry on [[IfYouKillHimYouWillBeJustLikeHim what she will become]].
* BadassAdorable: A highschool girl who not only runs a Civil Security Company, but also capable of kicking lots of ass with her katana.
* BenevolentBoss[=/=]BadBoss: Can go either way towards Rentaro depending on her mood.
* [[spoiler:BeYourself[=/=]IAmWhatIAm: This is how Kisara and Rentaro ended up as an OfficialCouple at the end of volume 6, as well as how the relationship conflict with Kisara was resolved during Rentaro's time as a fugitive. While they both don't agree with each other in terms of their ethics; they respect each other as who they are and their reason of existence, and do not wish to change each other's ways.]]
* BoobsOfSteel: A recurring gag with Kisara often involves her large breasts, often a source of [[ClingyJealousGirl Enju's]] [[ACupAngst jealousy]].
* [[spoiler:BrokenBird: What happened to her at the end of volume 6 in regards to the events that happened in volume 5 and 6 (in addition to losing her parents). She even mentions that a broken body can be healed, but you can never heal a broken soul.]]
* [[RedOniBlueOni Blue Oni]]: To Rentaro's red.
* ClingyJealousGirl: This starts to crop up when Miori Shiba, the student council president at Rentaro's school, and daughter of the CEO that sponsors his equipment, pays him a visit at the same time as her in episode 5. Kisara also doesn't like that Miori keeps trying to snag him away, not just romantically, but also to work directly for her company. Both girls end up making verbal jabs at each other while eating at his apartment. In episode 6, she also doesn't like it when Rentaro is alone with Miori in the student council office.
* ChildhoodFriendRomance: With Rentaro.
* CoolBigSis: A bit of one to Enju, and later, to [[spoiler: Tina.]]
* DarkAndTroubledPast: Her parent's death has caused to hate her own family heritage and take a darker turn of her personality.
* DeadpanSnarker: Particularly when it comes to Rentaro.
* GlassCannon: Her remarkable swordsmanship and skills makes her a remarkable fighter. [[spoiler:However, the fact that she has kidney problems prevents her from fighting in prolonged periods of time and put a strain to her body.]]
* [[MommyIssues Grandfather Issues]][=/=][[YoureNotMyFather You're Not My Grandfather]]: She strongly distrust and hates her grandfather and not only that, she hates the entire Tendo clan and decided to disown them for her parents' death.
* IfYouKillHimYouWillBeJustLikeHim: One of Rentaro's concern about Kisara's dark path of revenge against her family is that if she continues her path of revenge, she'll end up as bad as the family members she killed.
* [[spoiler:IllGirl: It's revealed that Kisara has a severe kidney health problem, thanks to the Gastrea attack that killed her parents.]]
* [[spoiler:JudgeJuryAndExecutioner: Served this during the duel against Kazumitsu and when killing him.]]
* [[spoiler:OfficialCouple: With Rentaro after the end of volume 6.]]
* PayEvilUntoEvil: Firm believer of this. Rentaro fears she may end up being just as evil as the people she's trying to kill.
* RapunzelHair
* ReasonableAuthorityFigure: She generally does what she can to help Rentaro out on his missions. Due to their strained finances, said help usually doesn't amount to much other than him not wanting to disappoint her, though that's usually enough to get him to accomplish the mission.
* RevengeBeforeReason: She wants revenge against her Tendo family clan for the death of her parents.
* SailorFuku: Her default outfit both for school and at work.
* SchoolUniformsAreTheNewBlack: Usually wears her school uniform on most occasion.
* [[HeWhoFightsMonsters She Who Fights Monsters]]: Kisara starts down this slippery slope in episode 13 after she brutally slices off her older brother's legs with an attack that ultimately kills him. She seems a little too ecstatic about having just murdered someone, even if it was justified, and Rentaro fears he may have to fight her someday if she continues down this path.
* ShesGotLegs: Which are accentuated with her knee-high socks.
* {{Tsundere}}: A type B for the most part. But she turns into an A if Miori is around, and enters ClingyJealousGirl mode.
* TsurimeEyes
* {{Yandere}}: PlayedForLaughs. In episode 5, she attacks Miori after the latter gets too close to Rentaro. And in episode 6, after he goes to the student council office to meet with Miori, Kisara tells him that she's going to throw a tear gas canister in there, and then she's going to shoot Miori twice in the chest, and once in the head when she comes out of the office.
* ZettaiRyouiki: Grade A

!!Tina Sprout
!!!'''Voiced by:''' Creator/TomoyoKurosawa (Japanese), Creator/CaitlynnFrench (English)
[[caption-width-right:225:The [[HeavySleeper sleepy]] [[CloudCuckoolander airhead]] loli.]]

A cursed child[=/=]mechanized soldier and Ayn Rand's Model Owl Initiator. She was sent to assassinate Seitenshi by Ayn, but was foiled by Enju and Rentaro. She was placed under special treatment and kept under surveillance under orders by Seitenshi. [[spoiler:She was later paired with Kisara after her release and joined the Tendo Civil Security Company.]]
* [[spoiler: AchillesHeel: Bright flashes or light temporarily blinds her as evident with the discharged flash bang (or the sudden flash of light from a Molotov cocktail in the light novels).]]
* ActionGirl: She can put up quite a fight, as several characters and a cop finds out.
* AnimalMotif: Owl.
* AscendedExtra: She later plays a larger role in volume 3 and 4.
* BadassAdorable: Like pretty much every other loli in this series. In episode 7, Miori mentions that Rentaro's fighting power is about 2200%. Meanwhile Enju's is rated at about 8600%, while Tina's is a mind-boggling 12,900%.
* BecauseYouWereNiceToMe: She was really soft on Rentaro when they first met because he talked to her normally and even bought some food for her later. [[spoiler:Heck, she even spares Enju's life as well.]]
* BewareTheNiceOnes: A cop finds this out the hard way when he innocently tries to help her while she was on her way to a mission. Fortunately for him he's stated to have survived, though his squad car gets totaled.
* {{BFG}}: She uses a gatling gun in one of her missions [[spoiler:to kill Kisara.]]
* [[RedOniBlueOni Blue Oni]]: She serves as the blue to Enju's red.
* BlushSticker: Like Enju, Tina have brightly colored blushes in her face that are mostly visible whenever she's happy.
* ChildSoldier: Was the product of the mechanized soldier[=/=]cursed child hybrid program.
* {{Cloudcuckoolander}}[=/=]TheDitz: Can be a bit of an airhead sometimes.
* ColdSniper[=/=]FriendlySniper: Her choice of weaponry in combat, though she does use combat drones for close encounters.
* CuteBruiser: Like many of the cursed children, she's pretty strong and powerful physically. In fact, it's even stated that her combat abilities is far superior than Enju's.
* DefeatMeansFriendship: After being defeated by Rentaro, she decided to join the Tendo Civil Security Company. Noting that Rentaro has treated with kindness while her employer doesn't care about her well-being, she decided to start a new life with the former and even made good friends with Enju.
* DesperatelyLookingForAPurposeInLife: She wanted to make her own life meaningful and wanted to have a reason to exist as a cursed child. [[spoiler:Thanks to some of Rentaro's encouraging words, she decided to find her own meaning in life by joining the Tendo Civil Security Company.]]
* TheDreaded: She's has a rank of 97. Seitenshi tells Rentaro that anyone ranked 100 or less are to be considered deadly. [[spoiler:He finds out about this after he sent Enju off to pursue her. He then tries to call her phone, and though it gets picked up, Enju doesn't answer it. He assumes the worst has happened.]]
* EasilyForgiven: Despite being ordered to take out Seitenshi, she is actually forgiven by the person she was trying to assassinate. Kisara and Enju also don't seem to hold any grudges against her despite Tina harming both of them before.
* EmptyShell: The reason she was working with Ayn Rand was because she felt that her life was completely empty, and by working with Ayn Rand establishes some meaning in her life. [[spoiler: Fortunately, she decided to find ''her own'' [[UsefulNotes/{{Existentialism}} reason of existence]] by joining the Tendo Civil Security Company.]]
* {{Expy}}: Has a passing resemblance with [[VideoGame/{{Touhou}} Suwako Moriya]].
* GeniusDitz: While she can act like an airhead from time to time, she can be very smart and clever as well.
* HairOfGoldHeartOfGold: [[spoiler:Despite Tina being ordered to kill Seitenshi, Tina one of the [[NiceGirl most kindhearted]] lolis at heart tied with Enju.]]
* HeavySleeper: She claims she's most active at night, and when Rentaro first runs into her during the day, he has to save her from some thugs who accost her after she accidentally hits one of them on her bicycle. Even taking caffeine pills doesn't help much.
* HeelFaceTurn: Not like she has a choice anyways. Fortunately it doesn't bother her as she likes Rentaro and Enju.
* HeroicBSOD: Suffers from a temporary one in episode 6, [[spoiler:after she finds out that Rentaro was the one guarding Seitenshi and foiled her assassination attempt.]]
* InnateNightVision: Due to her being a Model Owl, she has very strong night vision.
* JustFollowingOrders: The initial reason she was doing bad things. She tells Rentaro that by doing these things, it gives her life meaning. Rentaro calls her sad, but later mentions he would try to help give her a happier life without having to kill people.
* LittleSisterHeroine: Like Enju, Rentaro sees Tina like a little sister.
* NiceGirl: Like Enju, Tina happens to be a relatively friendly girl at heart. [[spoiler:Her kindhearted personality also plays a role into Rentaro's realization that Tina isn't an evil person at heart and is forced to assassinate people against her own will.]]
* ObfuscatingStupidity: When Rentaro first runs into her, she's very sleepy and still wearing pajamas despite it being broad daylight. She also seems dazed and confused, causing him to worry about her a little bit, and later gives her his phone number in case she needs anything. [[spoiler:However, it appears to have largely been an act, and she seems quite intelligent once she calls her handler and lets them know she's infiltrated the Tokyo area.]]
* OneNoteChef: Tina made pizza for Rentaro and Enju to eat for dinner. When she was asked what other foods she can make, she stated the pizza is all she can make.
* OnlyAFleshWound: Suffers from a shot to her abdomen by Takuto in episode 7. However, the latter realizes non-varanium bullets won't kill her outright, and wonders how many lead bullets it would take to eliminate her. He's stopped by Seitenshi before he can put that theory to the test.
* ParentalAbandonment: Though in this case it's because her parents died, as she reveals to Rentaro in episode 6 after he spends some time with her.
* PhenotypeStereotype: Subverted. She does have the blue eyes, blonde hair appearance of an American. However, her personality is completely opposite from the typical Japanese stereotype of an American.
* PrecociousCrush: Like Enju, Tina happens to be emotionally attached to Rentaro and wishes to marry him.
* TheQuietOne:She doesn't really talk much with people.
* ReluctantWarrior: She only kills when she absolutely has to, or is ordered to do so in the case of her first boss. Otherwise she tries to use non-lethal, albeit painful, methods of disabling non-targets. This is ultimately what saves her and gives her a better opportunity in life after she is stopped by Rentaro.
* SmallGirlBigGun: She uses a rather large sniper rifle.
* [[SmarterThanYouLook Smarter Than She Looks]]: She can be quite cunning despite her ditzy personality, more so then Enju.
* [[WiseBeyondTheirYears Wise Beyond Her Years]]: Even moreso than Enju.

[[folder:Other characters]]
!!!'''Voiced by:''' Creator/AkiToyosaki (Japanese), Creator/CarliMosier (English)

The current ruler of Tokyo Area. She fights for equal rights for the cursed children.
* ActualPacifist: She's a strong believer of pacifism and believes everyone can live together in harmony, both normal humans and cursed children alike.
** BadassPacifist: Despite her dedication to pacifism, she placed herself in dangerous situations during volume 2 and manages to escape house arrest placed by Kikunojou Tendo during volume 7 with the political fallout in the meeting with the city-states of Japan. Regardless, she looks badass and pacifistic at the same time.
* [[AChildShallLeadThem A Teen Shall Lead Tokyo]]: [[YoungerThanTheyLook And it's really hard to believe that]].
* BigGood: The closest thing this series has to one. She's a ReasonableAuthorityFigure, and works to improve the Cursed Children's lot in life, knowing that many people refuse to accept them because of the Gastrea breakout. She also tries to perform her duties even knowing that someone would attempt to assassinate her.
* {{Foil}}: To her aide and advisor Kikunojou. Seitenshi is a WideEyedIdealist pacifist who want to grant civil rights to the cursed children and be part of Tokyo's society. Kikunojou is a cynic who lived through the war and has strong hatred towards the cursed children; he sees the cursed children as vermin that need to be eradicated from society.
* NiceGirl: Really, this woman wants to implement civil rights for the cursed children in Tokyo.
* NiceHat: She's often seen wearing one.
* PimpedOutDress: She certainly stands out compared to many of the other characters due to her clothing.
* ReasonableAuthorityFigure: She gives Rentaro a surprising amount of freedom when he's assigned to her as a bodyguard. She also gives him the "power" he wants when he says he wants to be strong enough to protect his friends and loved ones, in the form of a FieldPromotion. Also, she wants to push for civil rights for the cursed children and pardoned Tina, noting that Tina isn't an evil person at heart.
* TooDumbToLive: While she doesn't get killed, Rentaro believes she's exposing herself too much when an assassin tries to take her out in episodes 5 and 6. For her part, Seitenshi says she has to maintain a public presence, though she at least does let him do things to try to ensure her survival, such as switching her out of the limo in episode 6 into one of the other vehicles in her convoy.
* WideEyedIdealist: She believes that the cursed children can live in harmony and peace with the normal humans in society and the key to defeating the Gastrea.
* WiseBeyondHerYears: Justified, considering she IS the ruler of Tokyo after all.
* WomanInWhite
* YamatoNadeshiko: Serves as a motherly figure to many of the protagonists.
* [[YoungerThanTheyLook Younger Than She Look]]: Believe or not, she happens to be roughly about Rentaro's age. Yet, the way she dresses, her mature personality, and her motherly like figure to many of the characters makes others mistake her as an adult. This trope is lampshaded by Rentaro himself.

!!Kikunojou Tendo
!!!'''Voiced by:''' Tamio Ohki (Japanese), Creator/JohnSwasey (English)

The grandfather of Kisara Tendo and foster father of Rentaro Sataomi. He works as an advisor and aide to Seitenshi.
* AdaptationalVillainy: Some of Kikunojou's more positive aspects of his character (such as his loyalty to Seitenshi, father-like relationship with Rentaro, and his sense of duty to protect the people of Tokyo) are highlighted in the light novel while still portraying him as an AntiVillain. The anime only highlights his more evil side of his character and make him more like a CorruptPolitician.
* [[spoiler:AntiVillain: His hatred towards the cursed children is partially because his tragic past of losing his wife, but he feels that the cursed children needs to be suppressed or eradicated as means of protecting humanity; and such hatred is necessary as means of defeating the Gastrea. Thus being said, he is strongly loyal to Seitenshi to the point to having plans to evacuate her and the citizens of Tokyo should Rentaro fail to stop the Hiruko pair (which he ironically hired by himself) or if Rentaro fails to stop the level 5 Gastrea. Having the political power and influence in Tokyo, he probably would be the guy who is willing to start a genocide on the cursed children, but as long as Seitenshi is alive, he probably wouldn't pull something off like that. Rentaro even describe him as a very contradicting character. The anime, however, cut out a lot of his characterization and portray him to be more like a CorruptPolitician.]]
* BadassGrandpa: He's an old guy who lead the Japanese troops during the Gastrea war.
* CorruptPolitician: [[AdaptationPersonalityChange How he is portrayed in the anime]].
* TheCynic: Because he lost his wife to the Gastrea 10 years ago, he isn't really happy about Seitenshi implementing civil rights for the cursed children.
* CynicalMentor: He serves as a fatherly teacher and mentor figure to Rentaro and gave some encouraging words to Rentaro[[spoiler:, such as "If you don't want to die, live"]]. On the other hand, he's a very jaded old man who has a strong hatred towards the cursed children and will do any necessary means to defeat the Gastrea, including genocide on the cursed children.
** [[spoiler:EvilMentor: Keep in mind that he also hired the Hiruko pair as well.]]
* [[spoiler:EvilOldFolks: He hired the Hiruko pair to stir chaos around the Tokyo area as means of discrediting Seitenshi implementation of civil rights for the cursed children (as Kohina Hiruko is a cursed child herself).]]
* {{Foil}}: To Seitenshi. While Seitenshi is a WideEyedIdealist pacifistic ruler of Tokyo who wants to implement civil rights for the cursed children, Kikunojou is a cynical old man who survived through the war and will do anything to prevent granting the cursed children civil rights[[spoiler: to the point of hiring the Hiruko pair to create a ZeroPercentApprovalRating for the cursed children]].
* FreudianExcuse: His hatred towards the cursed children is somewhat justifiable when his wife was killed by the Gastrea 10 years ago [[spoiler:and the eventual fate of many of the cursed children. That doesn't really justify his action of hiring the Hiruko pair to cause trouble in Tokyo though]].
* {{Irony}}: Despite his strong hatred towards the cursed children, he actually has strong distrust towards President Sougen Saitake of Osaka.
* {{Jerkass}}: Not only this guy want complete genocide on the cursed children[[spoiler:, he also hired the Hiruko pair to stir chaos around Tokyo]].
* KarmaHoudini: In the anime at least, he's not really punished for the stuff he was responsible for, [[spoiler:such as hiring the Hiruko's to discredit Seitenshi's plans to pass some laws to give the Cursed Children a better chance at life.]]
* NecessarilyEvil: He feels that the hatred of the cursed children and suppression of their rights is necessary to defeat the Gastrea. [[spoiler:This also involves hiring the Hiruko pair as well.]]
* PowerOfHate: His hatred towards the cursed children allows him to hold a lot of political influence and power in Tokyo, thus making Seitenshi's goals of implementing civil rights on cursed children difficult.
* [[spoiler:TheManBehindTheMan: He's the one responsible for letting the Hiruko pair go on a chaotic rampage and releasing a level 5 Gastrea in the Tokyo area.]]
* UndyingLoyalty: He's extremely loyal to Seitenshi. [[spoiler:Subverted that is willing to do evil things as means of discrediting Seitenshi's goals of implementing equal rights for the cursed children.]]

!!Sumire Muroto
!!!'''Voiced by:''' Creator/YukoKaida (Japanese), Joanne Bonasso (English)

The head Gastrea researcher of a medicine lab in Magata Public University Hospital who serves as a adviser and teacher to Rentaro. Eccentric, but is one of the four sages and was in charge of the "New Human Creation Plan."
* BunnyEarsLawyer: Despite her eccentricity and sometimes act a bit immature in front of Rentaro, she's actually quite smart and is one of the four sages.
* BiTheWay[=/=]StraightGay: Doesn't quite show the usual gay/bi cliches. In the first episode, after she [[ILoveTheDead jokingly referred to a corpse she did an autopsy on as her boyfriend]], Rentaro answered, that he thought, that she had a thing going on with a woman named Susan.
* CordonBleughChef: Her cooking and sense of taste are very odd.
* CoolBigSis: Serves this role to Rentaro
* EccentricMentor: Very much so, she loves to tease Rentaro at times.
* TheGadfly: Towards Rentaro, at least.
* {{Hikikomori}}: She's rarely seen outside of her own laboratory.
* MadScientist: A more heroic example.
* MotherlyScientist
* MsExposition: She provides a lot of the explanations for how things work in the series, such as when explaining to Rentaro about the procedures he underwent as a young child to enhance and fix up his broken body.
* ShipperOnDeck: For Rentaro and Kisara.
* {{Troll}}: She likes to tease Rentaro from time to time, because of how ObliviousToLove he seems at times.
* WomanChild: Is an adult, but she sometimes acts less mature than Rentaro, unless she gets serious.

!!Kagetane Hiruko
!!!'''Voiced by:''' Creator/RikiyaKoyama (Japanese), Jay Hickman (English)

A former promoter of a Civil Security company before his license was revoked due to excessive killing.
* ArtificialLimbs: [[spoiler:Like Rentaro,]] he took part on the "New Human Creation Plan."
* AxCrazy: Is perfectly okay with people getting killed for the sake of making sure people like him and Rentaro are needed to fight the Gastrea.
* BadassInANiceSuit: The only human enemy Rentaro faces who actually is a threat.
* BigBad: The main antagonist in the first volume.
* CoatHatMask: Kagetane wears a combination of a tailcoat, a top hat, and a white mask. His description in the first light novel even describes him with such.
* CoolMask: Wears a white mask which sports a exaggerated smile.
* CopKiller: Has no problem killing police officers if they get in his way.
* {{Cyborg}}: His internal organs have been replaced with Varanium cybernetics as a result of the New Human Creation Plan.
* DeflectorShield: His Repulsion Shield is basically this.
* DisneyVillainDeath: Rentaro knocks Kagetane into a river in episode 4 after finally managing to defeat the latter. [[spoiler:And episode 11 reveals he's NotQuiteDead, though he also isn't actively opposing Rentaro at the time either.]]
* DynamicEntry: Very fond of this. In the manga, he appeared out of nowhere by sitting on a chair.
* DystopiaJustifiesTheMeans: [[spoiler: Hiruko's motivation is to start another Gastrea war to ensure that the world will always be filled with chaos and always need people like him, the cursed children, and Rentaro.]]
* EvilLaugh: Enjoy this trope a lot.
* EvilIsHammy: In the manga and anime adaption, he's portrayed to be a bit more overdramatic.
* {{Expy}}: His mask evokes the Guy Fawkes mask-wearing character V from ''ComicBook/VForVendetta''. His personality and goals, however, are more similar to ComicBook/TheJoker, especifically his portrait from the 2008 film ''Film/TheDarkKnight''.
** {{Lampshaded}} in the anime. [[spoiler: When he joins Rentaro against the Gastrea and Aldebaran, Rentaro gives everyone a card motif. Kagetane's though? The Joker.]]
* ForTheEvulz: There really is no reason for the stuff he does besides enjoying it.
* GunsAkimbo: He dual-wields two custom Beretta handguns each with a bayonet attached below the barrel. They even have names: "Spanking Sodomy" and "Psychedelic Gospel".
* HeroKiller: He nearly kills Rentaro, and he definitely kills quite a few other characters before being stopped by Rentaro. He also killed [[spoiler: Shogen]] though he wasn't exactly a hero.
* HumansAreBastards: In a stark contrast to Rentaro's and Enju's HumansAreFlawed, Kagetane feels that humanity is irredeemable due to their racism against cursed children and feels that the world is meaningless.
* ImpossiblyCoolWeapon: His signature bayonet-bladed silver gun.
* LackOfEmpathy: Kaketane makes it very clear that he has little regard for other people. The only person he seems to genuinely care about is his daughter Kohina.
* [[LuckilyMyShieldWillProtectMe Luckily My Barrier Will Protect Me]]: It does the first few times he's seen using it, as seen in episode 2 when many shots are fired at him, only for him to stop every single bullet, and then deflect them back to the shooters. [[spoiler:Rentaro then reveals his cybernetic right arm, which is able to punch through said barrier due to it being made of varanium.]]
* NiceHat: Wears a top hat.
* NotSoDifferent: [[spoiler:He thinks him and Rentaro are this. He says that they are both much stronger than an average person and due to that power, they have thought of using force to get their way. The only difference between him and Rentaro is that he listens to his vicious thoughts.]]
* OffscreenTeleportation: Kagetane seems to be an accomplished expert of this. In the first volume of the light novels, he appeared right in the middle of a meeting sitting on a chair without anyone noticing. Though he did say he came through the front door, albeit by force.
* PetTheDog: He seems to genuinely care about his daughter, not that that takes away from his evil.
* RedAndBlackAndEvilAllOver: The colors of his suits vary from red to black, but he's still wicked all the same.
* StrawNihilist: [[spoiler: Sort of, he mentions to Rentaro that their purpose in life is mosttly because society is dependent on people like him and Rentaro and once society no longer needs them, then there is no purpose for the cursed children and civil securities. This is why Kagetane really wants Rentaro to join his cause of starting another Gastrea war.]]
* SuperSoldier: Even more so than Rentarou, since almost all of Kagetane's body is composed of [[{{Cyborg}} Varanium cybernetics]].
* TokenEvilTeammate: [[spoiler:Becomes this after he joins Rentaro and the others in stopping the Gastrea from penetrating any further into Tokyo. Due to him having killed many others prior to this, he is deeply mistrusted by virtually everyone, and Rentaro only puts up with him because he and Kohina saved his life.]]
* {{Troll}}: Likes to piss everyone off as much as possible.
* VillainousRescue: He does this a few times for Rentaro after the Gastrea breach one of the monoliths guarding Tokyo.
* WakeUpCallBoss: He's the first major antagonist Rentaro faces off against, and is quite formidable compared to the generic Gastrea monsters he's fought up to that point. In comparison with the other enemies Rentaro faces too, he gave Rentaro one of the hardest fights yet in the series.
* WhyDontYouJustShootHim: Zigzagged. He does in fact kill two police officers by shooting them when Rentaro first runs into him. And later he also shoots many other people at a meeting. However, when fighting Rentaro, he seems to prefer melee combat, most likely because he wants to test the latter's resolve and strength.
* WeCanRuleTogether: Hiruko is very interested in Rentaro and offers him the chance to join his cause on more than one occasion.
* WellIntentionedExtremist: He certainly tries to paint himself as a good guy, but Rentaro doesn't believe any of it due to the brutal methods he tends to employ, along with trying to bring more Gastrea invasions while the latter is trying to prevent them.
* WhatHappenedToTheMouse: He and his daughter aren't heard from after the Third Kanto War.
* WickedCultured: A very sharply dressed villain.
* WouldHurtAChild: [[spoiler: Attempted to kill Enju Aihara that forces Rentaro to TakingTheBullet]].

!!Kohina Hiruko
!!!'''Voiced by:''' Creator/AoiYuuki (Japanese), Krystal [=LaPorte=] (English)

Kagetane's daughter and a cursed child. She serves as a Model Mantis Initiator to Kagetane.
* AdaptationDyeJob: In the light novel series, she wears a black dress and has black hair. The anime design gives her dark blue hair and dark blue dress.
* AffablyEvil: Kohina often acts polite, make proper introductions to the victims she is going to kill, and even ask her father permission to commit murder on a particular person before she can do so.
* AnimalMotifs: To a Praying Mantis. Her two short swords invoke the claw-like pincers of one.
* AxCrazy: Despite looking like a typical cute girl, she has a tendency to talk about killing people and severing limbs as if it was normal dialogue for a young child.
* BadassAdorable: Like most Cursed Children.
** CuteIsEvil: She happens to be Kagetane's daughter and a mass murdering psychopath. Doesn't make her less cute in any form. [[http://www.black-bullet.net/contents/chara/kohina.html The anime character design highlights her cuteness further]].
* BadPowersBadPeople: As opposed to Enju's BadPowersGoodPeople.
* CreepyChild: Her smile just makes it even creepier.
* CuteBruiser: She's just as deadly in combat as Enju and Tina.
* CuteAndPsycho: She can appear innocent at first, until she starts killing people.
* DaddysLittleVillain: Kagetane is raising her to be quite an effective killer.
* DarkIsEvil
* DualWielding: Uses two swords in combat.
* EnfantTerrible
* RedEyesTakeWarning: Her red eyes look different to the common cursed child ones, but it only enforces her creepiness.
* UndyingLoyalty: To her father.
* WickedCultured: Wears a fancy black dress in combat.
* WhatHappenedToTheMouse:
** After her father is beaten, Kohina just disappears after Rentaro leaves. [[spoiler:Episode 11 reveals that Kagetane didn't quite die, and she's seen with him again, this time helping Rentaro.]]
** She and her father aren't heard from after the Third Kanto War.
* YouGottaHaveBlueHair: In the anime.

!!Shougen Ikuma
!!!'''Voiced by:''' Hiromichi Tezuka (Japanese), Creator/AndrewLove (English)

A battle-crazed Promotor for a Civil Security Company.
* AssholeVictim: He was rather rude and also killed his teammates in an attempt to not have to share the rewards with them. [[spoiler: He gets exactly what he deserves thanks to Kagetane.]]
* {{BFS}}: Use a giant sword in combat.
* BloodKnight: He always thirst for a good fight, which is why he refuses to back down on the fight against Kagetane even though he has virtually no chances of winning the battle [[spoiler:or have a high chance of getting killed]].
* CoolMask
* DumbMuscle: Let's just say he's isn't really that smart.
* HoistByHisOwnPetard: [[spoiler:His own sword is used to stab him in the back and killing him shortly after running into Rentaro and Enju.]]
* ImpaledWithExtremePrejudice: [[spoiler:Episode 4 reveals him slowly walking towards Rentaro asking where his sword is. Then as the camera angle changes, his sword has been impaled in his back. He falls over and dies shortly afterwards.]]
* {{Jerkass}}: He acts like a total asshole in the light novel series. In the manga, however, [[LighterAndSofter toned down his character]] and portrayed him more like a JerkWithAHeartOfGold.
* [[spoiler:KilledOffForReal: Killed by Kagetane in the duel between them.]]
* RatedMForManly
* [[RedOniBlueOni Red Oni]]: The red to Kayo's blue.
* TattooAsCharacterType: Spots tattoos all-over his body, showing his "tough guy" image.

!!Kayo Senju
!!!'''Voiced by:''' Creator/MegumiHan (Japanese), Creator/HilaryHaag (English)

Shougen Ikuma's Model Dolphin Initiator and a cursed child with an IQ of 210, but ill-suited for front-line battles.
* [[spoiler:[[AndThenJohnWasAZombie And the Stoic Loli Was About To Become the Gastrea]]]]
* BadassAdorable: She's a cursed child, of course she is!
** BadassBookworm: She has an IQ of 210 and is quite smart for a 10-year-old girl.
* [[spoiler:BecauseYouWereNiceToMe: The reason she decided to stay behind and fend off a swarm of Gastrea.]]
* [[RedOniBlueOni Blue Oni]]: She's the blue to Ikuma's red.
* [[spoiler:BoomHeadshot: How Rentaro MercyKill her to end [[TearJerker her pain and suffering from the Gastrea virus]].]]
* CuteBruiser
* [[spoiler:FaceDeathWithDignity: She is willing to accept death as her own fate when the Gastrea virus is overwhelming her body.]]
* [[spoiler:FamousLastWords: “[[TearJerker Rentaro-san, I think that next….there’ll be countless trails awaiting you. If you ever lose direction, get lost in the darkness, please follow the direction of your heart………light…….follow the light…….Rentaro………..please save…………………….this world]].”]]
* [[spoiler: GoOutWithASmile: She tries to go for this when talking to Rentaro for the final time.]]
* [[spoiler:HeroicSacrifice: She accepted her eventual fate of most cursed children will turn into EldritchAbomination and wanted to save Rentaro's life, feeling that he can make a greater change and save the world.]]
* [[spoiler:ICannotSelfTerminate]]
* ILied: In episode 4, she attempts to HoldTheLine for Rentaro, so that he can focus on stopping Kagetane. She assures him that she would run if she found herself at a disadvantage against the Gastrea approaching them. [[spoiler:After he defeats Kagetane, Rentaro finds a lot of dead Gastrea, and a severely wounded Kayo, who held out till the very end despite what she claimed earlier about running away.]]
* [[spoiler:LetThemDieHappy: When Kayo asks Rentaro if Shougen is alright, Rentaro responded that he is fine. Unfortunately, Shougen was killed off earlier and Rentaro wanted Kayo to die happily]].
* LockedOutOfTheLoop: When Rentaro finds her at the end of episode 4, she asks how Shougen is doing. He says that he's fine, and she's thankful for that. [[spoiler:However, he just lied to her to avoid having Shougen's death put more of a strain on her body, as Rentaro sees him right before he dies from getting impaled with his own sword.]]
* [[spoiler:KilledOffForReal[=/=]KillTheCutie: She's too cute for this CrapsackWorld.]]
* MercyKill: [[spoiler:When the first signs of her turning into a Gastrea shows up in her severed arm, she begs Rentaro to let her die as a human. Unfortunately all he could do was kill her quickly to avoid having her become a Gastrea.]]
* OneManArmy: She's actually quite strong enough to fend off multiple Gastrea in an area. [[spoiler:Unfortunately, the Gastrea virus in her body overwhelmed her and she started slowly to become the Gastrea.]]
* ShotgunsAreJustBetter: Her primary weapon.
* TheSmartGirl
* [[SmarterThanYouLook Smarter Than She Looks]]: Subverted, she's quite smart, but she's unable to identify the stages of the Gastrea virus. A bit justified there though, she's just a kid.
* TheseHandsHaveKilled: When hunting for Kagetane, she tells Rentaro that she was ordered by Shougen to kill another pair hunting the former because the latter didn't want to share the reward with anyone else. She mentions shaking in her hands as she did it, but says she'll get over that. Rentaro immediately tells her that she should never take killing someone so lightly, because otherwise they'll get used to it. While she says she could come up with reasons against that, she also tells him that she believes him.
* TheStoic: She isn't overly emotional [[spoiler:even when the Gastrea virus in her body was slowly consuming her]].
* [[spoiler:TooGoodForThisSinfulEarth]]
* WiseBeyondHerYears

!!Ayn Rand
!!!'''Voiced by:''' Creator/KosukeToriumi (Japanese)

One of the four sages who was part of the Mechanized Soldier Plan American Division, "NEXT." He breached the agreement between the four sages and used healthy cursed children to create mechanized Initiators, "HYBRID." He sent Tina Sprout to assassinate Seitenshi.
* BigBad: In volume 2.
** ManBehindTheMan: Since he doesn't appear physically, and only interacts via phone calls, he's this to [[TheDragon Tina Sprout.]]
* HeWhoMustNotBeSeen
* {{Jerkass}}: He virtually does not care about Tina's safety and well-being and even tells her that if she fails to kill Seitenshi a final time, to kill herself.
* MeaningfulName: He shares the same name with a libertarian philosopher, Creator/AynRand, who was well-known as the mother of UsefulNotes/{{Objectivism}}. Objectivism is known to have similar philosophical tenents of UsefulNotes/{{Existentialism}}, except Objectivism rejects subjectivism (which is one of the important tenets and themes of existentialism) and rejects the notion of "happiness for the greater good" as a purpose of life. This series is known to have strong existentialist philosophical themes and Rentaro happens to be a [[ForHappiness utilitarian]].
* TheUnseen: The readers do not know who he looks like. We only know him through the phone calls with Tina.

!!Miori Shiba
!!!Voiced By: Creator/AmiKoshimizu (Japanese), Creator/MargaretMcDonald (English)

She's the StudentCouncilPresident at Rentaro's school, and the daughter of the president of the company that sponsors Rentaro and provides him and Enju with equipment to fight the Gastrea with in exchange for the publicity when they use said items.
* ActionGirl: She knows how to fight just like Kisara, though their CatFight in episode 5 isn't seen directly. Instead the outside of Rentaro's apartment is shown, along with some bulletholes. Later the lights go out and Rentaro laments that he won't get his security deposit back now due to the damage the two girls caused.
* ClingyJealousGirl: She butts heads with Kisara regarding Rentaro, since both of them like him, and hate each other as a result of it. Hilariously, when Kisara draws her blade at Miori, both Rentaro and Enju don't stop them. Rather, they just pick up the table with all the food and move it out of the living room so the two girls can duke it out.
* CombatHandFan: The fan she carries around is also used for combative purposes.
* KansaiRegionalAccent
* KimonoIsTraditional: Always wears a kimono no matter how impractical it is in combat.
* MissionControl: She does this for Rentaro and the others fighting against the Gastrea in episode 12 and 13.
* TheRival: To Kisara.
* ScrewTheRulesIHaveMoney: When Rentaro needs weapons, she's more than happy to provide him with them. Of course she often does it with the intention of luring him over to her and away from Kisara, which [[ClingyJealousGirl frustrates the latter]] to no ends.
* [[SmarterThanYouLook Smarter Than She Looks]]: She appears to be TheDitz at first, but she's actually quite smart, and certainly knows how to press Kisara's BerserkButton when it comes to Rentaro.
* StudentCouncilPresident: At Magata High School, where Rentaro attends when he's not fighting Gastrea.
* TheTease: She enjoys doing this to Rentaro, especially if Kisara is around to watch it.

!!Shoma Nagisawa
!!!'''Voiced by:''' Creator/ShinichiroMiki (Japanese), Mike Yager (English)

Senior disciple of the Tendo style martial arts, Rentaro's senior and old friend. Joined Rentaro's team during the battle against Aldebaran's army.
* EmptyShell: [[spoiler:Was this after he was kicked out of the dojo and before meeting Midori.]]
* HeroicSacrifice: [[spoiler:He sacrificed himself to activate the bomb buried into Aldebaran, resulting in him and Aldebaran to get blown to pieces.]]
* LongHairedPrettyBoy
* NiceGuy: While he's introduced fighting another civil officer, he's actually quite a nice guy. Even Rentaro seems to have gotten along with him before he left the dojo they trained together at.
* NotQuiteDead: [[spoiler:He was retrieved by Sogen's organization, but he lost all of his limbs, hair and 70% his body was covered burnt.]]
* RealMenDontCry: [[spoiler: Though his words shake and he's clearly upset, he doesn't shed a single tear when Midori dies.]]
* SempaiKohai: Rentaro and Kisara both think of him as a Sempai and look up to him.
* TheStoic
* WeHardlyKnewYe: In the anime at least, he doesn't have a lot of screen time. Fortunately he's one of the good guys, and both Rentaro and Kisara respect him highly despite him leaving the dojo a short while back due to him working on an unconventional fighting move.

!!Midori Fuse
!!!'''Voiced by:''' Creator/YuiOgura (Japanese), Creator/CynthiaMartinez (English)

Nagisawa's initiator, model cat, a timid girl. She joined Rentaro's team along with Nagisawa during the battle against Aldebaran's army
* AbsurdlySharpBlade: Well, it's her claws, but she does cut an assault rifle into pieces when she slashes it with them.
* BadassAdorable: As with any other cursed child loli working as an initiator. Heck, she even spots cute cat ears and is a Model Cat Initiator as well.
* BoomHeadshot: [[spoiler:Suffers this fate when she shoots herself in the head in a remote area to avoid burdening the surviving Security officers in episode 12.]]
* BraidsOfAction: Keeps her fluffy white hair tied up over the shoulder in one of these.
* CatGirl: Doesn't have the tail (which Enju and Yuzuki attempted to confirm by pulling her skirt down), but does sport some cat ears, which she hides under her witch hat.
* CuteBruiser: As with many cursed children working as Initiator. Heck she even destroyed a criminal's assault rifle and avoided all bullets without a single scratch.
* [[spoiler:DrivenToSuicide: During the second battle she was caught off guard and injected with large amount of Gastrea virus. This lowered her lifespan to a month and paralyzed her body. Not wanting to be a burden to everyone she left and killed herself under a tree.]]
* GoOutWithASmile: She has a smile on her face after she dies.
* HeroicSacrifice: Shoma mentions to Rentaro in episode 12 that she risked her life attempting to save an Initiator she didn't know, and was injected with a lot of the Gastrea virus as a result. [[spoiler:She then kills herself to avoid being a burden to Rentaro and Shoma, since she was bedridden and likely not to survive much longer anyway.]]
* NiceGirl: Midori happens to be a very kind girl at heart.
* NiceHat: Used to hide her cat ears.
* ShrinkingViolet: She is very shy and meek and doesn't speak too loudly around others.
* [[spoiler:TooGoodForThisSinfulEarth: Like Kayo, the fact that she happens to be a good person at heart makes her death tearjerking.]]
* WeHardlyKnewYe: Suffers this fate similarly to Kayo. She's introduced and given some brief characterization, then suffers a debilitating attack by the Gastrea which cripples her body and greatly shortens her lifespan as a result. [[spoiler:She then kills herself to avoid being a burden to Rentaro and Shoma since she was unable to fight or even move around much.]]
* WolverineClaws: From her fingernails to be exact.

!!Tamaki Katagiri
!!! Voiced by Creator/YoshimasaHosoya (Japanese), Adam Gibbs (English)

President of Civil Security. Joins Rentaro's Group during the Third Kanto War.
* AwesomeButImpractical: His chainsaw gloves.
* BrotherSisterTeam: With Yuzuki.
* [[CoolBigSis Cool Big Bro]]: Not only to Yuzuki, but once he joins the Gastrea-exterminating team, he gives off this vibe to everyone during his nice moments.
* CrazyJealousGuy: Towards Rentaro when he seems to be getting a little too friendly towards Kisara.
* DefeatMeansFriendship: They were already friends, but he only joins Rentaro's group after he bests him in a brawl.
* DoggedNiceGuy: Towards Kisara.
* GoodOldFisticuffs: Makes good use of his chainsaw gloves in combat as a result.
* HotBlooded: Brash and energetic to a fault, especially when he's fighting.
* JerkWithAHeartOfGold: He's initially callous and downright rude when first asked help by Rentaro. Once he joins the group, he shows himself to be a helpful, support, and generally friendly guy.
* NiceGuy: While he can be brash and abrasive at times, he's generally relatively friendly.
* SirSwearsALot: The dub turns him into this with no shortage of F-bombs.
* SupremeChef: Surprisingly.

!!Yuzuki Katagiri
!!! Voiced by Creator/RumiOokubo (Japanese), Creator/BrittneyKarbowski (English)

Tamaki's Initiator and younger sister, a model spider. She joined Rentaro along with Tamaki for the Third Kanto War.
* AdorablyPrecociousChild: She's fond of calling Rentaro a pervert.
* BadassAdorable: Like every Initiator.
* BigBrotherWorship: Towards Tina, though they're not related and they're roughly the same age.
* BrattyHalfPint: Acts this way towards Rentaro, and usually calls him a pervert.
* BrotherSisterTeam: With Tamaki.
* ClingyJealousGirl: Acts this way towards her brother when he first sees Kisara and is smitten by her.
* CuteBruiser: Like all cursed children workingas Initiators.
* DefeatMeansFriendship: Towards Tina after being beaten by her, but also being praised for her fighting skills.
* GenkiGirl: She's even more hyper than Enju, and with a tomboyish flair to boot.
* GirlishPigtails: In spite of her tomboyish personality, she sports these. They slightly resemble a tarantula's legs, likely to hint at her being Model Spider.
* RazorFloss: Seems to employ this to trap her targets so she can attack them more easily.
* [[SirSwearsALot Lady Swears A Lot]]: Like her brother, she drops a lot of F-bombs in the dub.
* {{Tomboy}}: Yuzuki has some boyish like personality traits like being brash and abrasive, likely a result of living with her older brother. There's also her abundance of swear words in the dub (and noted to be the ''only'' cursed child to drop a lot of profanity in her dialogue).

!!Takuto Yasuwaki
!!! Voiced by Creator/SubaruKimura (Japanese), Creator/ScottGibbs (English)

One of Seitenshi's bodyguards, mostly seen in episodes 5-7 and volume 2 of the light novel.
* AssholeVictim: Due to the terrible treatment he gives Rentaro and Tina, it's not likely anyone would object to the way Rentaro pays him back in episode 7.
* AxCrazy: He develops this look in episode 7 after shooting Tina.
* GreenEyedMonster: He's rather angry that Rentaro was offered a bodyguard job by Seitenshi in episode 5. While Rentaro was debating whether to take the job, Takuto threatens him not to, which then causes the former to accept it after all.
* {{Fingore}}: His finger is shot off by an angry Rentaro after Seitenshi gives him a FieldPromotion, allowing the latter to outrank him.
* FourEyesZeroSoul: He at first seems to be a reasonable person, greeting Rentaro normally when they first meet. However, shortly after this, he shows the other side of his personality, and is quite the JerkAss about Rentaro even being offered the mission in the first place.
* {{Jerkass}}: He was pretty much an asshole. [[spoiler: [[KickTheDog Heck, he even shot Tina as well]].]]
* TheMole: Rentaro suspects he was one in episode 7, after Takuto tells him they came up with a route to take Seitenshi to her latest meeting to avoid ambush spots like before. [[spoiler:Tina later calls Rentaro to let him know that said route she got from her master seems oddly strange in that there's one spot she could easily fire at Seitenshi from. Tina later gets shot by Takuto, who then mentions that Seitenshi was taken to the meeting without incident, and seemed to know where she and Rentaro were at.]] In the end though Rentaro wasn't able to fit enough pieces of the puzzle together to determine this.
* ScaryTeeth: He displays some in episode 7 to go with his AxCrazy look.
* WhyDontYaJustShootHim: Averted, he does shoot Tina after Rentaro stops her in episode 7. He then wonders how many lead bullets it would take to kill her since he didn't have any varanium bullets on him.
* WouldHurtAChild: [[spoiler:Attempted to kill Tina even though he knows that normal bullets are ineffective against cursed children.]]

!!Kazumitsu Tendo
!!! '''Voiced by:''' Kazuyuki Okitsu (Japanese), Houston Hayes (English)

One of Kisara's older brothers and a politician. [[spoiler:He conspired with his three other brothers and Kikunojou against Kisara's parents and is responsible for the money embezzlement during the construction for one of the monoliths that lead to the endangerment of millions of lives in Tokyo. He was killed by Kisara in a duel.]]
* AmbitionIsEvil: [[spoiler:He embezzled the monolith construction money so that he can hold a political position in Tokyo.]]
* AssholeVictim: [[spoiler:He pretty deserved to be killed, seeing that he's not only responsible for Kisara's parents deaths, but also the endangerment of millions of lives.]]
* BladeOnAStick: Uses this as a weapon during the duel between Kisara.
* CorruptPolitician[=/=]SleazyPolitician: Easily fits into this description. [[spoiler:He was responsible for the death of his and Kisara's parents. And later he embezzled money by using substandard materials to create the Monolith that collapsed with, and pocketing the money in hopes of getting enough money to buy influence and get elected. Kisara puts a stop to that when she kills him.]]
* FourEyesZeroSoul
* ItsAllAboutMe: Doesn't care what happens to anyone, so long as he can get a lot of money, and get elected as a politician. [[spoiler:Kisara puts an end to that when she kills him for his actions.]]
* {{Jerkass}}: [[spoiler:He's not only responsible for Kisara's parents deaths, he also placed millions of lives at risk for his personal selfish gains.]]
* KarmaHoudini: Averted. [[spoiler:Kisara kills him, though Rentaro fears she may be [[HeWhoFightsMonsters going down a slippery slope]].]]
* WeHardlyKnewYe: [[spoiler:We barely know who he is across from the fact that he's a CorruptPolitician prick]].

!!Sogen Saitake
!!!'''Voiced by:''' Creator/UnshoIshizuka (Japanese), Ty Mahany (English)

Ruler of the Osaka Area. He aspires to rule the world someday.
* GodwinsLaw: Only in the light novels. To be more precise, Rentaro compares him to UsefulNotes/AdolfHitler on how they both take advantages of tragedies and wars, reunite the people, and use the advantage as a means of establishing a military superpower to TakeOverTheWorld.
* TakeOverTheWorld: This is his goal.


Tropes applying to the entire Gastrea species as a whole.
* AchillesHeel / KryptoniteFactor: To Varanium. It completely nullifies their HealingFactor and it is said that if a Gastrea was put into a room made entirely of Varanium, it'll die a slow and painful death. If not for this metal, humanity would've been wiped off the planet. Though the exact scientific details as to why they're weak to Varanium has yet to be explained.
* AlwaysChaoticEvil: The Gastrea are portrayed as a race of monsters that will always target humanity no matter the circumstances, and seem to be dead set on wiping them off the planet for unknown reasons that go beyond normal animal instincts.
* EldritchAbomination: Stage 4 and 5 Gastrea are this.
* HealingFactor: The Gastrea can heal their wounds very fast, making them nearly impossible to kill by conventional means. It's because of this reason that humanity nearly went extinct, and only Varanium is capable of completely nullifying their healing factor.
* ItCanThink: According to Sumire, there's a theory that the Gastrea are actually highly intelligent which would explain their unnatural behavior towards humans.
* MixAndMatchCritters: Some Gastrea can be hybrids of various animal traits. The Gastrea that appeared in the prologue of the first volume was said to look like a dinosaur with modern bird wings and insect compound eyes.
* UltimateLifeform: Considering that they managed to become the top of the food chain in not even a year since they appeared, many scientists consider them as such as they now make up the entirety of Earth's ecosystem.
* TheVirus: The Gastrea Virus can heavily alter human DNA and mutate the hosts into monsters very quickly, bypassing millions of years of evolution in just a couple of minutes.
* WasOnceAMan: Every single Gastrea monster was once a human that got infected at some point, [[spoiler:or a Cursed Child who's body became completely corroded by the virus]].


The stage 4 Gastrea that attacked Tokyo area during volume 3 and 4. It was the former right hand to the stage 5 Taurus before Taurus was killed.
* TheDreaded: Due to being extremely hard to kill, it earns this reputation when people hear that it's approaching.
* HealingFactor: [[spoiler:Aldebaran has one of the strongest healing ability shown in the series, as long as its body is not completely destroyed, it can come back to life no matter what damage it sustained.]]
* PointDefenseless: It launches some spikes out of its back at Rentaro as he closes in on it. Like the trope implies, they aren't very effective against him.
* SuperpowerLottery: It is hard to kill, it can release pheromones to control an army of Gastrea, it can corrode Varanium and it is larger and stronger than most stage 4 Gastrea. This is why it's TheDreaded when it shows up after the monolith breach.
* KnightOfCerebus: Just when you are wondering why humans are so afraid of Gastrea, this thing shows up and explains it in action and drag the tone of the novel further in to darkness.

The stage 5 Gastrea that appeared in volume 1.
* WeHardlyKnewYe: It appeared only briefly before getting killed by the ladder to heaven.

One of the stage 5 Gastrea and leader of the famous Taurus army. It and it's army destroyed many cities in the Middle East and Africa, but was eventually defeated by the IP 1 promoter pair. After it's death it's army scattered ending the threat of Taurus
* WeHardlyKnewYe: Got killed before the serie started by IP 1 combo
* TheDreaded: Before it got taken down by the IP 1 combo, any city that was on it and it's armies path was destroyed. No survivor was ever found.

[[spoiler: One of the stage 5 Gastrea, it was mentioned in vol 7]]
* ImprobableAimingSkills: During the great Gastrea war it shot down nearly all of mankind's satellites all by itself.

One of the stage 5 Gastrea, it was showed up in vol 7 and appeared near the Sendai area.
* PlagueMaster: It have the ability to create different types of air borne diseases, this troublesome ability caused large amount of death during the Gastrea war.