open/close all folders
Voiced by: Hiro Shimono
(Japanese), Sean Michael Teague (English)
A boy seemingly unknowing of the ways of the world — including the concept of blood — who nonetheless braves it in order to search for his former caretaker, Karoku, an enigmatic figure who parted ways with him before the story began.
- Cheerful Child
- Children Are Innocent: He knows next to nothing about the world except what Karoku taught him, unknowing of what "blood" is and what it means when it's splattered outside the body.
- Constantly Curious: He's always running off and getting lost in crowds because of this.
- Everything's Better with Rainbows: It's what his species name, Niji, means. He originally lived in the Niji Forest, and he later somehow casts a large rainbow in order to find Karoku.
- Good Is Dumb: Justified, considering that he was originally a cute little animal, and looks like and is later referred to being a child as well. However, unlike some character types who remain clueless throughout the story, he's slowly learning more about the world.
- Heroic Albino
- Humanity Ensues: Originally a cute animal called a Niji, he was somehow transformed into a human in an as of yet unspecified way.
- Innocent Inaccurate: He described blood as "red water."
- Morality Pet: Seems to be one for just about everyone in Circus to a varying degree, but none more so than with Gareki.
- Ridiculously Cute Critter: In Niji form.
- Red Eyes, Take Warning: Subverted, he is incredibly naive and would barely hurt a fly unless an animal was about to kill Karoku.
- Super Senses: Despite his not having any offensive abilities at the moment, Nai is far from being The Load, as his elevated hearing has more than once been crucial in ensuring the survival of those around him, and later, useful during missions.
- Tender Tears: Several times, most notably in episode 3.
- Zettai Ryouiki: A male example, Grade A.
An intelligent and resourceful young man, Gareki starts the story engaged in corrupt business before things take a very wrong turn. In the midst of the chaos that ensues, he somehow saves Nai from the vile woman he originally meant to rob, and becomes involved in the mystery surrounding the boy while they are on the run.
After Circus takes Nai into their custody, he's determined to stay for his own gains, but in truth he may care more about those around him than he likes to let on, even to himself...
- Badass Normal
- Bring My Red Jacket
- Combat Medic: Currently in training to be such.
- Dark and Troubled Past
- Defrosting Ice Lord: Nai (unwittingly) and Yogi (determined) together with other Circus members have gotten him to open up considerably.
- Gadgeteer Genius: Made particularly apparent through his contribution to the mission to save Karoku in volume 7.
- Goggles Do Nothing: Averted. He's wearing them in his first appearance, having just blown up a portion of the mansion where he meets Nai. They don't get much use after that, though this is justified by the fact that he has no need for explosives after being taken aboard Circus's second ship.
- Handguns: Gareki likes using them. Circus doesn't like his use of them.
- Jade-Colored Glasses: The losses in his childhood, which includes being sold as a slave by his parents and seeing his Parental Substitute being exploited, as well as life on the street have made him very cynical about people (himself included) and unwilling to make friends.
- Street Urchin: Gritty type. Prominent early on, though the circumstances over why are explained later. He does mellow down once he and Nai wind up with Circus, becoming broodier and using less dirty tricks. His sharp intellect's evident throughout, however.
- The Smart Guy: Despite the implication of his street savvy, Gareki's shown and later noted to read frequently during his time in Circus, which heightens the poignancy when what he was reading up on is revealed in a conversation with Hirato in chapter 38. His skills as an unsung Gadgeteer Genius backs this position up further.
- Stuff Blowing Up: Is very knowledgeable about explosives. He was even introduced setting up a bomb.
- The Gunslinger: What he might be, if Circus allowed him to use his gun.
- Tsundere: Gareki can be a Type A male version, especially when Yogi teases him.
- In fact, both Yogi and Tsukumo are awestruck at his surprising innocence regarding snow (which he had never seen) at one point in the manga.
- Healthcare Motivation: He originally got into thieving to pay for his foster grandfather's medical bills.
The mysterious young man whom Nai is looking for. Little is known about him, but it appears that he was always with Nai and suddenly disappeared one day, leaving behind a trail of blood and an outdated Circus bracelet. It's revealed that there are actually two Karokus, and chapter 57 confirms them to be brothers.
- Aloof Big Brother
- Subverted in chapter 52, where he breaks down in tears when Nai is close to death.
- Bandage Babe: He's always in bandages in-story for undisclosed reasons.
- Dark and Troubled Past: As the Circus bracelet left behind in blood indicates.
- Evil Twin: It's very possible that the Karoku who is working for Kafka is this to the one who took care of Nai.
- Kidnapped Scientist: If he really was involved in the creation of Nai, who's successfully existing as a new hybrid species, then it is very likely that he was abducted for his knowledge of genetics as well as his ability to create a stable life form, an aspect in which Kafka's valga have fallen short.
- Manipulative Bastard
- Nice Guy: Nai thinks of him as "as warm as the sun". Later events hint that there is something sinister about him
- Turns out he was a nice guy, it's just that there were two Karoku's.
- Not So Stoic: In chapter 52, after regaining his memories of Nai, he loses his usually composed disposition and breaks down in tears when Nai is close to dying from his injuries.
- Psychic Link: He seems to be able to communicate with Nai this way under certain circumstances.
- Teen Genius: Heavily implied to have had a hand in the creation of Nai as a Niji-human hybrid.
- Trauma-Induced Amnesia: After he's rescued from Kafka by Circus, his memories become so scrambled that he entirely forgets his relationship with Nai. Dr. Akari suggests it's because of the stress of his previous circumstances.
- You Gotta Have Blue Hair: Exactly What It Says on the Tin
- Your Days Are Numbered: Implied. A servant of the Kafka manor where he is staying comments that it's a waste to feed him.
- You Have Outlived Your Usefulness: Implied when he suddenly tells Nai through their telepathic communications that he's going to be killed soon if Nai doesn't come rescue him.
Circus Second Ship
- Cane Fu: Hirato's weapon of choice, with the special attack "Vakuum."
- The Captain
- Father to His Men
- Foil: To Akari. Hirato is a seemingly friendly Bitch in Sheep's Clothing whose job is to eliminate lives, while Akari is a serious Jerk with a Heart of Gold whose job is to save lives.
- Manipulative Bastard
- Magnificent Bastard: exhibits shades of this, as he always seems to have a plan and is one step ahead of everyone else.
- Noble Demon: Says to Akari rather wistfully that it's his job to take lives but as seen in flashbacks with his first encounter with Yogi, Hirato is not quite as ruthless as he'd like everyone (and himself) to believe. Not to mention how protective he is of his "children".
- Papa Wolf: He may be the Stoic Glasses and furthermore, a Manipulative Bastard, but Hirato does NOT like it when people mess with his "children."
- Ymmv, but he also has shades of Team Dad and A Father to His Men. His affection for his crew is more concealed than most examples of thiese tropes, and may manifest in strange ways (due to his love of provoking others), but he does things like buying candy and souvenirs for Nai and arranging for Gareki to attend school in the hopes of getting his license to officially join Circus. These tendencies are perhaps best viewed in his interactions with Tsukumo, though ymmv on whether you read those in a romantic context or not.
- Passive-Aggressive Kombat: Master of this, as part of his Manipulative Bastard package. Played for Laughs when he's around Akari.
- Scary Shiny Glasses: On occasion.
- The Southpaw: Wields his cane with his left hand.
- Stoic Glasses: Hirato fits this to a T.
- Tranquil Fury: Though almost impossible to read most the time, he has a moment of this as early as chapter 14 when, after Yotaka fought against and injured Yogi, he pursued the person responsible and just after talking with him calmly, says, "It is enjoyable to torment, isn't it?", (even sporting a pleasant smile to boot) before having his banshees tear him apart.
- Another time this happens is in chapter 35 when Azana betrays and tries to kill Akari. He doesn't smile this time or have any sarcastic remarks, but he knocks Azana away and calmly states the punishment for attacking someone of SSS rank before attacking. If Akari hadn't stopped him, he would have killed Azana without a second thought or any emotion on his face at all despite his anger. Do not dare to hurt Akari.
Voiced by: Mamoru Miyano
(Japanese), Christopher Bevins (English)
"The soaring male spirit, the heart-throbbing sparkly prince, National Defense Organization 'Circus' Second Ship member Yogi!"
- Afraid of Needles: Specifically, of Doctor Akari to the point of amusement for the audience. It's probably because of a traumatic surgery, as Gareki guesses.
- After-Action Patch-Up: Almost in all his battles especially Rinoll and Merumerai.
- Beware the Nice Ones
- Big Brother Mentor: To Gareki (mainly about enjoying life and bonding with other people) and Nai.
- Crouching Moron, Hidden Badass
- The Ditz
- Dark and Troubled Past: The cause of both his Split Personality and Trauma-Induced Amnesia. It started out pretty well, then all went to hell.
- Dual Wielding
- Green Thumb: Yogi's weapons are two thorn-like épées, and he can conjure up thorny vines with them as well. Combined with Scarf of Asskicking in chapter 19, whereupon the Badass split personality of Yogi saves Gareki from the split personality's own attack this way.
- Heroic BSOD: Finding the decapitated corpses of his caretakers as a child.
- Hidden Depths: Yogi can be melodramatic and flamboyant one moment, then more serious than the First Ship's female fighter the next. There's definitely a lot of this going on here.
- Knight in Shining Armor: His "role" in Circus shows, hilariously combined with a mascot costume.
- Man Child: He's 21 and acts like he's 10.
- Nice Guy
- The Patient Has Left the Building: When he ran away to Vinto.
- Trauma-Induced Amnesia: He doesn't remember the first 10 years of his life, due to various reasons. His other self seems to have retained some memories though, but disregards them as nightmares
- Pointless Band-Aid: Averted. It's actually a medicinal patch that administers allergy medicine. And also strangely keeps his split personality in check.
- Stepford Smiler: Somewhat. Silver!Yogi shows signs of being this
- Something About a Rose: The kanji for one of his defense techniques is "Rose Barrier."
- Split Personality: His usually gold hair turns silver as an indication.
- Sunny Sunflower Disposition
"Numerous stars fall from the sky. The little lamb knows the sky. National Defense Organization Circus Second Ship member Tsukumo."
Voiced by: Yoko Honna
(Japanese), Jessica Cavanagh (English)
"I command the stones. Bury the demon in dazzling brilliance. I am enthroned as the Queen of the Sapphire Crown. National Defense Organization "Circus" Second Ship member Eva."
- Cool Old Guy
- Hidden Depths: Like Yogi, he appears to be dramatic and silly, but according to Hirato, he's highly capable. He also said some sobering things to Gareki and Nai.
- The Medic
- The Mentor: To Akari and possibly also Hirato.
Circus First Ship
- The Alcoholic: Played for Laughs
- The Captain
- Hidden Depths: While he comes off as much more laid-back than Hirato and Akari, his expression turns quite sinister at one point when he asks Tsubame what she's willing to sacrifice to protect the people around her.
- Foil: The noisy, cheerful and seemingly silly Captain to Hirato's calculated and suave manners. He's by no means incapable though.
- The Fool
- Large Ham
- Not a Morning Person
- Friendly Address Privileges: Loves to call Akari-sensei "Akari-chan", a fact that irritates the doctor as he is older than him. According to the short extra after chapter 72, he even called him that when Akari used to be his instructor in Kuronomei.
- Always Someone Better: To Azana.
- Brutal Honesty/Deadpan Snarker: "What's wrong with telling the truth? If you don't like it, then improve things!" That line says it all. Another example◊
- Bunnies for Cuteness: The flower bunny that he takes care off is meant to represent his soft side. In the fanbook it is stated that it brings him joy to take care of it. I mean the bunny refuses to return to the wild to stay with him. You cannot get any cuter than that.
- The Charmer
- Cross-Popping Veins: When he is angry but not yelling Here
- Color Contrast: Black/White contrast with Hirato as another way to remark their foil status.
- Curtains Match The Windows
- Dressed to Heal
- Dr. Jerk: In Yogi's opinion, but not really true.
- Foil: To Hirato. Akari is a serious Jerk with a Heart of Gold whose job is to save lives, while Hirato is a seemingly friendly Bitch in Sheep's Clothing whose job entails taking lives.
- Friend to Bugs: In the Drama CD of a character song it was revealed that he likes insects and would not allow Hirato and Tsukitachi to harm one when it escaped and ruined his lab.
- Freudian Trio: The Super Ego, Hirato is the Ego and Tsukitashi the Id.
- Food Slap: In the Drama CD's when Hirato and Tsukitachi upset him too much, he threw wine to both of their faces.
- Good Is Not Nice: Although he is a very kindhearted person and means no harm, he is rather harsh and domineering.
- Hospital Hottie: It's Lampshaded with the nurses, who both fawn over him and hilariously deny him whenever he tries to use his charms to make them do things.
- Jerk with a Heart of Gold ◊
- Parental Substitute for Azana.
- Labcoat of Science and Medicine: In this case is both since he is both a doctor and a resercher. Almost never seen without it.
- Messy Hair: He actually looks younger and nicer with it. 
- Mr. Exposition: Most of his conversations involve him explaining something to someone else.
- Names to Trust Immediately: Part of the Vinto arc was about how the drugs were distributed because someone was using his name. 
- Sitcom Archnemesis: Mainly to Hirato.
- The Stoic: ◊
- Not So Stoic: When he discovers that Azana was poaching in vinto and then when he tells him that he hates him. It is far more dramatic in the CD drama, but the face he makes in the anime was really sad. ◊
- Perpetual Frowner: You almost never see him smile unless he's smirking.
- Twitchy Eye: ◊ ◊
- Spock Speak/Techno Babble: He always talks in very scientific terms, most notably in the manga, especially when making explanations.
- No Sense of Humor: Once again lampshaded by Tokikatsu in a omake. Here◊
- Omnidisciplinary Scientist/Super Doc: Not only does he have medical knowledge, he also has knowledge and does research concerning biology, archeology, genetics and pharmacology as he is the Research Tower´s Research Chief Specialist. Relating to his medical knowledge he is also a surgeon, an expert in emergency medicine, fixing fractures, making his own medicine (Yogi's allergy patch). That indeed takes a lot of different medical specialties. No wonder he is a SSS rank.
- Proud Elite
- Vitriolic Best Buds: Although he acts antagonistic towards Hirato and Tsukitachi he ends up spending his free time with them drinking (initially not willingly of course). Both Hirato and Tsukitachi both care for him as well and make sure he takes a break once in a while. They were both worried for him after the incident with Azana.
- You Gotta Have Blue Hair: Pink in his case.
- Workaholic: He does not believe in taking breaks or rest. It is lampshaded by Tokikatsu in a message he sent him. ◊ ◊ ◊
- Badass in a Nice Suit: His default attire.
- The Dragon: He appears to be this to Palnedo, even taking the fall for him after the whole Smoky Mansion fiasco.