A taciturn Collector who hates coils and coil-related technology. He collects illegal coils for Mary in exchange for money and gasoline, which he uses for his old gasoline-powered car. In the past, he was a member of a special-ops, anti-coil military unit named Grendel.
- Anti-Hero: He really hates coils in his heart, but he's still one of the main heroes to the story.
- Badass Normal: He possesses neither superpowers nor coil-enhanced weaponry, but is more than capable of defeating gangsters, cyborgs, and security bots.
- Berserk Button: Don't hurt children in front of him. Or even hint at having maybe hurt one. You will bear to see WHY he was called the "Beast of Grendel".
- Born in the Wrong Century: Twofold, for his fashion and attitudes and love of gasoline.
- Charles Atlas Superpower: Despite being a normal human, Kyoma is capable of throwing needles hard enough to pierce metal and can run ridiculously fast without any aid. However he does have trouble moving rocks.
- His backstory further demonstrates this trope. When in high school, he could singlehandedly beat down entire groups of thugs effortlessly, and already had an insane skill for throwing. When in college and pressed to the ground with his arm tightly gripped behind his back, Kyoma pushes his military-trained aggressor up slowly while the bones in his arm audibly fracture and seems relatively non-plussed about it. The mere demonstration of this trope (and his unbreaking resolve to save Miyabi) was what got him hired into Grendel in the first place!
- Cool Car: Has a couple vintage, gasoline-fueled cars.
- Dark and Troubled Past: Lost his entire Grendel unit (except for Albert) during an incident involving a Numbers coil. It's implied that the Numbers coil became unstable and allowed Dimension W energies into reality. He also lost his ill girlfriend to a coil accident while he was recovering from the mission, which resulted in his hatred of coils.
- Experienced Protagonist: In contrast to Mira(a relatively young robot), Kyoma has been through a number ordeals as a member of the Grendel unit. A number of characters still recognize him as a "Beast of Grendel".
- Fantastic Racism: Dislikes robots since they rely on coils to function. As a result, he's very rude and dismissive of Mira.
- Flechette Storm: Uses large, throwing needles as weapons. He can precisely hit numerous targets at once.
- Foil: To Albert. Kyoma is a grouchy, coil-hating Collector, while Albert is an easygoing man working for the company that makes coils. They are also opposites in terms of appearance, with Kyoma possessing dark hair and eyes, and Albert being blonde with blue eyes.
- Most prominently with Mira as the central duo of the series. She's the idealistic, friendly robot who is the pinnacle of coil technology. Kyoma, on the other hand, is a coil-hating cynic who lives in the past.
- Friend to All Children: In a Jerk with a Heart of Gold manner, and he will really only admit it to his sister-in-law. He seems to be easily annoyed by kids and their antics, but puts up with them anyways. Despite his irritable nature, he's never hurt a child and is quick to defend them from any danger.
- Hey, You!: Never refers to Mira by name. He usually addresses her as 'piece of junk' or 'robot'.
- Improbable Aiming Skills: He has ridiculously good aim with his throwing needles.
- Inexplicably Awesome: His incredible physical capabilities go completely unexplained. At first one might assume that they were the result of training or enhancement while in Grendel, but it turns out they were part of the reason he was recruited in the first place.
- Jerkass: He's curt, blunt, and ruthless, showing little sympathy for the illegal coil users that he confronts (although they do tend to deserve it). He's also very rude to Mira, refusing to call her by name and didn't even provide her with a bed when she moved in with him.
- Jerk with a Heart of Gold: Although Shota, Shiora, Hamu, and Jin frequently bother him, Kyoma doesn't really do anything to stop them. He only tells them off and sends them on their way. He seems concerned for their safety, scolding them for playing near the dangerous pile of abandoned cars in the yard nearby. In addition, Kyoma refuses to tattle on the kids to their parents or school authorities. Kyoma is aware that the kids will get into a lot of trouble if they're found out, which will affect their future aspects severely. Even if he doesn't care for the kids very much, he refuses to help the system that is trying to control them. He is also far kinder to his older sister-in-law than everyone else.
- Just a Machine: Considers robots as only machines that are easily replaced.
- Knife Nut
- Laser-Guided Amnesia: Most of the Easter Island mission is missing from his memory. He remembers infiltrating the island with his Grendel unit, then nothing. The next thing he knows, he's waking up in a hospital bed.
- The Lost Lenore: His girlfriend Miyabi Azumaya suffered from a disease that degenerated the muscles in her body. In an effort to save her, Kyoma requested that Seira Yurizaki build Miyabi a cyborg body. Unfortunately, Miyabi died after a coil accident in the lab right after the mission on Easter Island.
- Perpetual Frowner: Never cracks a smile. Except when he was around Miyabi.
- The Stoic: He rarely expresses any emotion asides from annoyance.
A highly-advanced robot created by Dr. Yurizaki, the founder of New Tesla Energy. Mira considers Dr. Yurizaki as her father and cared for him before meeting Kyoma. After her father's death, Mira works and lives with Kyoma, helping him collect illegal coils.
- Armor-Piercing Slap: Gives one to Kyoma after he almost allows a gangster to kill her. She smacks him so hard that he passes out. Frankly, it's amazing that she didn't break his jaw in the process.
- Badass Adorable: As cute and girly as she is, she is not to be taken lightly, by virtue of the strength and durability her robot body grants her. In terms of effectiveness in the field, she isn't that far beyond Kyoma, who has considerably more practical experience.
- Bad Liar: In order to avoid arousing NTE's suspicions, Mira must hide the fact that she's a robot. Unfortunately, she's really bad at lying.
- Barbie Doll Anatomy: She doesn't seem to have nipples.
- Big Little Brother: Mira was built to resemble a teenage girl. She looks older than her 'big sister', Ichigo Yurizaki, who was a small child.
- Curtains Match the Window: Green eyes and mostly green hair.
- Dark and Troubled Past: Mira's creator and 'sister' (Dr. Yurizaki's wife and daughter) were murdered on the day that Mira was 'born'. She spent the next two years in hiding with Dr. Yurizaki, caring for him as he suffered from an unknown disease. Then she has to helplessly watch as her father activates a device that shorts out every coil in the vicinity and kills him.
- Deuteragonist: She is the 'daughter' of Dr. Yurizaki, the pioneer of coil technology and the creator of New Tesla Energy. As such, she has a connection to the plot that's just as if not more important than Kyoma's own arc.
- Exotic Eye Designs: Her pupils become gear-shaped and move when she's scanning something.
- Expressive Ears: The robotic 'ears' on the top of her head move to match her emotions. She doesn't have much control over them, so they tend to be a pretty obvious giveaway that she's not human.
- Fanservice Pack: Manga-only. When Koorogi repairs her after losing her head, he jokingly proposes to upgrade her breasts. She gladly accepts.
- Gainaxing: More than once have her breasts been given this treatment. The OVA version of the intro (which has Mira performing the dancing bit instead of Kyoma) emphasizes this the most though, as literally every step she takes causes her chest to bounce.
- In a Single Bound: Mira uses her jumps to travel fast, far and high, getting across the city in several bounds and is able to reach the higher levels in skyscrapers. Though she notes that her jumping power isn't was it used to be since she changed to a legal coil.
- "It" Is Dehumanizing: Despite being an extremely advanced android, Mira considers herself a real girl, as real as any human. She doesn't appreciate being called 'it' and 'robot' by Kyoma.
- Meaningful Name: Her name, Mira, comes from the Japanese word for future, mirai.
- Ms. Fanservice: Gets a lot of nude scenes (including a Shower Scene), where the camera slowly pans up her body.
- Multicolored Hair: Her green hair has two purple strands in it.
- Nice Girl: Mira is cheerful and kind to everyone.
- Off with His Head!: Gets decapitated trying to save some kids from falling cars. She functions fine without her head and can still talk, though her voice gets tinny.
- The Pollyanna: Despite losing her father and having to deal with Kyoma's surliness, Mira always looks on the bright side and tries to do her best.
- Proper Tights with a Skirt: One of her outfits includes this.
- Replacement Goldfish: Sort of. Her body was prepared for Miyabi. It is an exact replica down to her shoe size because it was supposed to be her replacement body. Her personality is also similar. Kyoma doesn't think so. She's actually a replacement for Dr. Yurizaki's daughter, who was murdered by New Tesla soldiers.
- Ridiculously Human Robot: Asides from her more robotic appendages, Mira looks just like a normal teenage girl. So long as she covers up her robotic ears and tail, most people can't tell that Mira isn't human.
- Robot Girl: She's a cute robot that resembles a teenage human girl.
- Super Strength: She's much stronger than she looks. When buying furniture for her trailer, she easily carried all of it from the store back to Kyoma's place without breaking a sweat. She also slapped Kyoma hard enough to knock him out for several hours.
- Super Toughness: Mira is incredibly durable. She's literally lost her head without any detrimental effects and doesn't even flinch when Kyoma tries to punch her. He, on the other hand, almost breaks his hand.
- Suspiciously Specific Denial: She is most definitely not a robot! Those things on her head are, erm, hair clips! Interestingly, though, the manga explains that those some people use robot-like antennas as a fashion accessory, so that lie can actually sort of work.
- Why Did It Have to Be Snakes?: Gets very scared when the probability of ghosts comes up in the Yasogami Lake incident. She's also none too fond of creepy or gory things.
- X-Ray Vision: She can see past clothing and skin, allowing her to see a person's skeletons and any bits of metal that they're carrying.
- You Gotta Have Blue Hair: Has light green hair with two purple streaks.
A shady business owner that frequently hires Kyoma to retrieve illegal coils in exchange for cash and gasoline.
- Benevolent Boss: To her subordinates, though she can verge into Mean Boss. She pays her employees well, but has no problem ripping them a new one if they fail to complete their objective.
- Berserk Button: Breaking her things, such as 4.
- Jerk with a Heart of Gold: Bosses Kyoma around, but does set him up with gasoline and she brought him back into the real world.
- Large and in Charge: Mary has impressive girth and equally impressive hair. She leads the Collectors around Tower 47 and feels comfortable ordering both Kyoma and New Tesla Company agents around.
- Mean Boss: Jerk With A Heartof Gold variety. She bosses Kyoma around, but did get him back onto his feet. She is normally a Benevolent Boss.
- Shark Pool: Her headquarters has a giant tank filled with sharks. She often briefs Kyoma on his missions while sitting in front of it.
A computer expert and engineer employed by Mary. He doesn't get along with Kyoma, but provides him with information when requested.
- Dude Looks Like a Lady: He looks kinda like a girl, if the picture of him there doesn't clue you.
- Insufferable Genius: He's a computer prodigy and he knows it.
- Meaningful Name: His name translates to 'cricket', which his helmet resembles. It actually might be a nickname, as the French edition directly translates it.
- Nice Hat: Has a helmet that looks like a cricket.
- Smug Smiler: Always has a smug smirk on his face.
- Techno Wizard: He's really good with computers and other machinery, including robots. He repairs Mira after her coil was damaged by her father's device. He also supplies Kyoma with information from security cameras and data records.
The leader of New Tesla's elite investigation team, Qi, and Kyoma's former comrade in arms. Unlike Kyoma, Albert is much more cheerful and easygoing.
- Affably Evil: Ambiguously Evil, but he is far more cheerful and easygoing than Kyoma
- Ambiguously Evil: He works for New Tesla and is aware of what happened to Dr. Yurizaki and wants to make Kyoma is subordinate, but it is left unclear whether or not he is evil or not.
- Charles Atlas Superpower: Albert was also a member of Grendel, which is where he met Kyoma. Albert can easily dodge Kyoma's attacks and manages to land nonchalantly on his feet (with his hands in his pockets!) when kicked out of a second story window.
- Foil: To Kyoma. Kyoma is a grouchy, coil-hating Collector, while Albert is an easygoing man working for the company that makes coils. They are also opposites in terms of appearance, with Kyoma possessing dark hair and eyes, and Albert being blonde with blue eyes.
The creator of New Tesla Energy, Yurizaki was responsible for discovering Dimension W and finding a way to tap into its energy with coils. Two years before the series begins, he went into hiding after NTE allegedly murdered his wife and daughter.
- Ascended to a Higher Plane of Existence: This is heavily implied in the final episode to be what happened to him, when a spectral version of him appears to comfort Seameyer in his last moments as well as entrust Mira with a brand new coil.
- Cynicism Catalyst: In past videos, Dr. Yurizaki seemed like an optimistic, enthusiastic man dedicated to spreading a clean source of energy around the world. Two years after the death of his family, he is much more angry and vengeful. He willingly sacrifices his life to activate a powerful device that shorts out all coils in the vicinity.
- Heart Trauma: When he activates the dual coil and burns out every coil nearby, he also affects the coil powering his heart. It causes his shirt to catch fire, which quickly spread to consume his entire body.
- Literal Change of Heart: Underwent a heart transplant 4 years before the story starts. It's powered by a coil, although he replaces it with an illegal coil after going into hiding. The illegal coil prevented NTE from tracking his location.
- You Killed My Father: He blames the New Tesla Company for murdering his wife and daughter in order to get access to his research.
Shido Yurizaki's wife, and the woman who created Mira, initially as a replacement body for Kyoma's ill girlfriend.
Prince Salva Enna Tibesti
A charming prince from Africa, as well as CEO of the world's foremost robot producer, Islero. However, he's not nearly as nice as he seems and has something dastardly in mind regarding the Collectors. He challenges the Collectors to meet him on Easter Island in 7 days time after sending Lwai to destroy Four as a demonstration of his power.
- Bitch in Sheep's Clothing: Although he's handsome and charming on the surface, he's actually very condescending and controlling underneath. He sends Lwai to attack Four without provocation and seems to be trying to start a conflict of some sort with the Collectors.
- Control Freak: He seems to like controlling others based on his comments. He states that he finds his servant, Lashiti, beautiful because he can bind her will. Later, he mentions to Claire Skyheart that he finds her beautiful she understands that the world requires discipline.
- Long-Haired Pretty Boy: He's attractive and he has shoulder-length hair.
- Jerk with a Heart of Gold: Later episodes reveal that his current motivations are all to find a way to restore Lwai's body, as he truly does love him.
- Man in White: Wears a white suit and is definitely up to no good.
- My God, What Have I Done?: While trying to take out a would be assassin with his tank Lwai so happened to be passing by and gets caught in the explosion.
- Pet the Dog: As unsavory and controlling as he seems, he does genuinely love his little brother.
- You Have Failed Me: Electrocutes a servant after he fails to retrieve Lwai.
Prince Lwai Aura Tibesti
Like Salva, Lwai is an African prince and a member of Islero. Unlike Salva, Lwai is cheerful and adventurous, running off to explore the city and learn about Japanese culture. He bumps into Kyoma and ends up dragging the Collector around the city, looking for fun.
- Cheerful Child: Lwai looks to be in his early teens and is very upbeat and full of energy.
- Cyborg: After being caught and grievously wounded in a blast aimed at an assassin. He gets built as a cyborg.
- Dark-Skinned Blond: Providing a contrast with Salva, who has black hair.
- Dragged into Drag: Courtesy of Kyoma's sister's shop assistants.
- Dude Looks Like a Lady: He looks very feminine, something that was not missed when he was put into a female's kimono.
- Fake Arm Disarm: One of his robotic arms is blasted off by Yuri in Episode 10, cementing the reveal that he's actually a Cyborg.
- Morality Pet: For Salva, by being the one person that his big brother genuinely cares about.
- Occidental Otaku: Apparently he only learned about Japanese stereotypes before actually visiting the country. He thinks that Kyoma is a samurai and is very excited about meeting geishas and sumo wrestlers.
- Remote Body: It's established that he has multiple robotic bodies. When one is destroyed by K.K. and Yuri, he shows up a minute later in another one.
- Spell My Name with an "S": The French edition has his name spelled "Roowaïh", the English subs have "Lwai".
- Super Strength: He's strong enough to destroy Four, a military-grade robot that is well-known for their fighting capabilities. That's because he's also a robot.
- Thanatos Gambit: Possibly. In Episode 10 he ambushes K.K. and Yuri and is grievously wounded, but warns K.K. that he'll get him next time before decapitating himself. At that exact moment Kyoma happens to enter the room... Ultimately subverted since that was only one of Lwai's multiple bodies.
Loser/Julian Tyler Smith
A showy Phantom Thief that frequently targets art galleries. He's very popular with the media, but has never actually stolen anything, earning him his name. What the public doesn't know is that he's actually targeting illegal coils hidden inside art pieces. Illegal coils with numbers etched into them...
- Badass Longcoat: Has a stylish longcoat and can easily break into highly guarded facilities.
- Body Horror: He lost both of his hands in the incident that scarred his face. He's replaced them with cybernetic prostheses, which are able to spin 360 degrees and can cut through glass.
- Classy Cravat: Adds to his Gentleman Thief look.
- Dark and Troubled Past: He has a vendetta against the Numbers, which were involved in an incident that killed his wife and caused his facial injuries.
- Facial Horror: His face looks like it was burnt off, leaving behind a mass of scar tissue hidden by his mask.
- Gentleman Thief: Warns his targets and avoids collateral damage during his heists.
- Go Out with a Smile: After the final battle, even though his mouth is concealed, his death is definitely an example of this.
- Hellish Pupils: Suggesting that his eyes are artificial.
- Hidden in Plain Sight: His assistant uses robotic pigeons to broadcast his heists on television networks.
- Lovable Rogue: Sure, he's a thief, but the public loves him. It helps that he never actually steals anything (that his audience knows about anyways...certainly nothing that his victims would actually admit to possessing) and puts up one hell of a show with each heist.
- Master of Disguise: He disguises himself as Manager Makita, with neither Kyoma nor Albert catching on.
- Phantom Thief: Sends warnings to his targets before he strikes.
- Sharp-Dressed Man: Sports a fancy coat and a cravat on his escapades.
- Worthy Opponent: Considers Kyoma to be a worthy adversary.
A Collector that is constantly brimming with curiosity. She figured out that Mira wasn't a normal android right away, pointing out that it was rude to scan people without permission. It turns out that she's Loser's assistant and daughter.
- Bat Out of Hell: Uses bat robots to gather information and has a bat motif in her clothing.
- Constantly Curious: According to the anime's official site, she is always brimming with curiosity.
- Daddy's Girl: As Loser's daughter, she is shown to really love him, working with him.
- Dye Hard: In-Universe. Her hair is dyed blond for her vampire gothic look, shown in the manga as wearing off when the sprinklers hit her. Her natural hair color is brown.
- Elegant Gothic Lolita: Wears an elegant black and white dress, with little bat wings and a devil tail.
- Happily Adopted: Chapter 78 of the manga reveals that Ellie isn't Loser's natural daughter.
- Hidden in Plain Sight: Her specialty when it comes to surveillance drones. After all, who would ever give a second thought to seeing pigeons in a large city, or to seeing a bat flying around in the woods at night?
- Squishy Wizard: Well Techno Wizard, she is capable of elaborate robots, but as a young teenager, she is able to be disabled by the lake spirits very quickly, and comes close to drowning.
- Sweet Polly Oliver: The first time she is seen, she is dressed like a young boy with a baseball cap and sweatshirt.
- Take Up My Sword: With her father's death, she takes up his work as a Collector, much to Kyouma's surprise.
- Techno Wizard: As Loser's assistant, she's able to hack into security networks and jam broadcasts with highly realistic pigeon robots. As Elizabeth, she uses bat robots to communicate over long distances and to gather information. Even Koroogi is impressed by the robot pigeons.
- Teen Genius: Although she's young, she can make sophisticated robots for intelligence gathering. Loser wouldn't be able to perform his heists without the help of Elizabeth's surveillance and hacking skills.
Kyoma's wife, who loves photography. She later lost her life in a coil accident leading to Kyoma's hatred of coils.
- Brooding Boy, Gentle Girl: She was the gentle girl to Kyoma's brooding.
- Huge Guy, Tiny Girl: She barely came up to Kyoma's chest.
- Ill Girl: She suffered from a disease that caused her muscles to atrophy.
- Off with His Head!: The main part of the operation that was supposed to save her life was that her head was to be transplanted into the new robotic body that Dr. Yurizaki created for her. Obviously when the coil accident happened, all that was left for Kyouma to grieve over was her original, now-headless, body.
- Posthumous Character: She died before the story began at the same time of the Grendel incident.
- Too Good for This Sinful Earth: Was one of the kindest characters in the series and died in the backstory.
A former scientist for New Tesla. He is one of Shido Yurizaki's former students who was expelled for conducting illegal experiments with coils.
- An Arm and a Leg: His arm got telefragged when he stole Genesis.
- Eldritch Abomination: He at some point became a man soul sucking sphere. Subverted, he's not the sphere.
- Evil Eyeshadow: He usually wears purple eyeshadow.
- Mad Scientist: He was totally absorbed in the development of the ultimate coil, Genesis. When the research on it was cancelled because it was deemed too dangerous, he lost his mind and started to commit more and more insane crimes to complete it, culminating in the Easter Island incident.
- The Revolution Will Not Be Civilized: He has started a war or two in various countries in order to rebel against New Tesla.
- Villainous Breakdown: He really loses it when he learns that Kyoma destroyed Genesis, thus rendering his entire Evil Plan pointless.