Index Protagonists | Railgun's Main Cast
The Teachers and Students of Academy City | Academy City Founders, Researchers and Law Enforcement
Academy City's Dark Side | The Sisters | Other Science Side Characters
England and its Allies | The Roman Catholic Church | GREMLIN | True GREMLIN | Other Magic Side Characters
Other Light Novel, Manga, and Anime Characters | Audio Drama, Video Game, and Movie Characters
A friend and classmate of Touma, as well as his next-door neighbor at their dormitory. He's also a skilled sorcerer; however, undergoing the Power Development Curriculum causes his magic use to become fatal. His ability, Level 0 Auto-Regeneration, counteracts this, though imperfectly. He is a freelance spy for several organizations, including Necessarius, Academy City, and GROUP. The leaders are aware of this and let him be for the time being.
- Anime Hair: As seen in the picture.
- Almighty Janitor: Like Touma, he's labeled as a Level 0 for his ability. This doesn't diminish his effectiveness as a spy or a fighter in the least.
- BrotherSister Incest: Has feelings for his step-sister.
- Book Dumb: Like Touma, he's actually very smart outside the esper curriculum. And despite his reputation in school, he's also a highly-skilled onmyoji and an excellent spy.
- Bunny-Ears Lawyer: A shameless siscon with a Verbal Tic who happens to be a spy for Academy City, Necessarius, and a member of GROUP.
- Code Name: Fallere825
- Cool Shades: Is never seen without them.
- Embarrassing Nickname: "Siscon Sergeant". Yet he's proud of it.
- Fake Defector: Will very often pretend to betray his comrades, and often doesn't let them in on his plan.
- Fights Like a Normal: Because he can't rely much on his magic due to being a Magician-Esper Hybrid.
- His combat style is known as "Deadly Thrust Killing Slash", which incorporates a whole slew of martial arts styles and allows him to wipe the floor with just about anybody in close combat.
- Faking the Dead: As of New Testament 7, he is now believed to be dead apart from Seria, who helped to smuggle him out of the city.
- Foil: Like Touma, he consistently involves himself in both Magic and Science side affairs due to being a freelance spy. However, he generally has to tackle larger affairs compared to Touma's individual heroics.
- The Gadfly: Acts very annoying to everyone because it amuses him.
- Hawaiian-Shirted Tourist: Subverted. He's not a tourist but is often seen wearing a Hawaiian shirt and sunglasses.
- Healing Factor: His Esper power, Level 0 Auto-Rebirth.
- Heart Is an Awesome Power: Downplayed. His Auto-Rebirth ability can counteract life-threatening injuries caused by his unique status but is too weak to fully work and could fail at any time.
- He Knows Too Much: Inverts this trope as his main method of self-preservation. He knows just enough that he's too valuable to lose and too dangerous to kill.
- Heroic BSoD: Goes into one in New Testament Volume 7 after hearing a false report that Maika had been murdered. It was so bad that he lashes out at Touma, who beats him unconscious with ridiculous ease and comments that there's no way it could have been that easy.
- Heroic RRoD: Since he's a sorcerer-turned-esper, should he ever use magic it can kill him. Luckily, his self-regeneration esper powers mitigate that. Sadly, he also mentions that his ability is imperfect (being a Level 0) and could fail anytime. He estimates he only has 5 or 6 "lifelines" left.
- Hidden Heart of Gold: He often says some really scary and unempathetic things while on the job, but is also repeatedly shown to be a good guy beyond that.
- Pragmatic Hero: As a member of the Dark Side of Academy City, he's not afraid to get his hands dirty.
- Not Blood Siblings: An excuse for why he has feelings for Maika.
- Pretentious Latin Motto: "The Backstabbing Blade"
- Red Oni, Blue Oni: The blue to Pierce's red.
- Regular Caller: Since Volume 14, he's been dragging Touma for European missions, which comes to a head in Volume 17, where he uses knockout gas to bring him to London. Which makes this a rather literal case of "The Call Knows Where You Live".
- Self-Proclaimed Liar: He takes pride in it, and gets annoyed when people don't believe that he is.
- Single-Target Sexuality: Despite his perversion and Casanova tendencies, he really only has eyes for Maika.
- Shipper on Deck: For Touma and Kaori Kanzaki.
- Tears of Blood: When he uses his powers, in addition to Blood from the Mouth.
- Those Two Guys: With Pierce.
- Verbal Tic: Nya!
- Weak, but Skilled: He's overshadowed by most of the mages and espers in the series in terms of sheer power on account of both his power set (focused around fung shui) and being a sorcerer-turned-esper, but he's an extremely deadly combatant nonetheless who can hold his own with them.
- Wild Card: Works as a freelance spy for seemingly all the different factions at once, making him a Double Reverse Quadruple Agent. So far his straight loyalties only lie with his stepsister Maika.
- Worf Had the Flu: He effortlessly defeats Touma in their first fight, the former remarking that he hadn't been hit by him. So when Touma starts to curbstomp him, he knows something is wrong...
- See A Certain Magical Index Protagonists folder.
She is the guide to the windowless building where Aleister Crowley resides and is a member of GROUP, forced to join when the city's Board of Directors captured her close friends and blackmailed her. Her ability is "Move Point", a ramped-up version of Kuroko's power in that she doesn't need to touch objects to teleport them. She is living with Tsukuyomi Komoe after losing to Accelerator in the Tree Diagram 'Remnant' incident.
- Achilles' Heel: Her teleportation is three seconds slower than Kuroko's, and she'll start coughing up blood from the strain if she teleports herself too many times in a row.
- Arc Villain: Tree Diagram Remnant Arc.
- Awesomeness by Analysis: Teleporters have to make calculations on factors like mass, volume, vector, etc. Normal scientists don't want to have to deal with it due to the 11th dimension coordinates involved.
- Bare Your Midriff: She usually wears a Sarashi and no shirt, leaving her midriff on display.
- Belligerent Sexual Tension: With Accelerator. They even mockingly call each other husband and wife.
- Coat Cape: She wears the Kirigaoka Girls' Academy uniform's coat over her shoulders like a cape.
- Combat Pragmatist: She just shoots Kuroko after the Villainous Breakdown.
- Comedic Shotacon: When she notes with amusement all the guys in GROUP seem to have a thing for little girls, Accelerator simply replies back she's the one into little boys, which both Motoharu and Etzali answer in the affirmative to.
- Evil Counterpart: To Kuroko.
- Evil Vegetarian: She's a strict vegetarian and tells her teammates that they're "killing themselves" with their meat diet.
- Girlish Pigtails: As seen in the picture.
- HeelFace Turn: Mellows out after being "adopted" by Komoe-sensei.
- Magic Feather: Although not strictly necessary, she shines a flashlight on the spot she wants to teleport to to help her concentrate.
- Ms. Fanservice: Her outfit shows off a lot of skin.
- Never My Fault: She believes that abilities are scary in and of themselves for being able to harm others, but Kuroko points out that espers can use their powers for good, and Musujime is merely deflecting responsibility for her own life choices.
- No Shirt, Long Jacket: She rarely wears shirts, so her top consists of a Sarashi to cover her breasts and her school uniform's jacket that she wears as a Coat Cape.
- Pragmatic Hero: Post HeelFace Turn, she's a member of the dark organization GROUP, which is a group largely dedicated to keeping the peace through rather questionable methods.
- Sarashi: Most of the time, she only wears bandages to cover her breasts instead of wearing a proper top.
- She's Got Legs: She wears a deadly short skirt, and barely anything to cover that up, revealing her long, slender legs.
- The Smurfette Principle: She's the only female member of GROUP.
- Superpower Lottery: The strongest Level 4 Esper shown so far, according to Word of God. She can teleport objects without even touching them and has more than twice the range and more than twenty times the haul load Kuroko does. She would have reached Level 5 had she not had... an unfortunate accident.
- Teleportation Sickness: See Achilles' Heel.
- Teleportation: Her ability, Move Point, is basically Kuroko's power ramped Up to Eleven.
- Teleporter Accident:
- Teleported herself partially into a wall when she was younger and tried to pull herself out. The results were messy.
- She does it again while fighting Megumi during the Battle Royale arc thanks to AIM Jammers messing with her powers and ends up teleporting her feet into the ground. This time, however, she forces herself through the pain, shock, and fear and takes Megumi out regardless even as she rips them again.
- Trauma Button: An incident two years before the story began had her leg get stuck in a wall and tore off skin while trying to remove it. Since then, she became terrified of teleporting herself, so she wastes 2-3 crucial extra seconds working up the willpower when she absolutely can't just leave on foot, and feels naseous afterwords.
- Villainous Breakdown: When Kuroko points out her hypocrisy and how she's the problem, not her powers. The point is compounded even further when Kuroko tries to hurt her without her abilities.
Etzali AKA the fake Mitsuki Unabara
- Voiced by: Daisuke Kishio (Japanese), Justin Pate (English)
An Aztec magician who was originally a member of Return of the Winged One. He was sent into Academy City to destabilize the growing Kamijou Faction, by sowing distrust into it's members. He is later defeated by Touma Kamijou himself, and later joins GROUP. He is usually referred to as "Unabara Mitsuki" as he has not told anyone in Academy City his real name.
- Berserk Button: Seeing Tecpatl use Tochtli as live ammo.
- Crazy Jealous Guy: He attacked Touma, seeing him as a rival for Mikoto's affections.
- Deliberate Injury Gambit: Swords used for sawing bones aren't much good for cutting through them directly!
- Face Stealer: His primary power. While he only needs to steal a bit of skin to effectively take on a person's appearance, killing them to prevent them from running around at the same time has its advantages.
- Frickin' Laser Beams: By reflecting the light of Venus off the blade.
- HeelFace Turn: Well, if you can consider GROUP to be good guys, anyway.
- In Love with the Mark: He was assigned to seduce (which he failed to do) and kill Mikoto, but fell in love with her.
- Knife Nut: Wields an obsidian blade that is a replica of the Spear of Tlahuizcalpantecuhtli.
- Meaningful Name: Derived from "eztli", meaning "blood".
- Not Himself: Not him personally, but when an assassin from his old organization comes after him he's shocked at how differently she's acting.
- Stalker with a Crush: To Mikoto.
- Tome of Eldritch Lore: First he took Xochitl's to save her from dissolving, and later he outsmarted an opponent using the basic trait that the grimoires want to have their knowledge spread. So then he contracted with a second grimoire to help the first girl's friend.
- Unscrupulous Hero: After joining GROUP. Casually kills someone in a group being sent to attack him in order to copy his appearance (as in, ripped off part of his skin and put it on) and then when a telepath is checking to see if anyone is a spy uses plastic explosives to make someone else look like a spy and injure the telepath so that she couldn't check him. In his defense, he did feel bad about the second one and the first was trying to kill him.
- Wild Card: Let's remember that he won a proposed wager by Tecpatl for control over the Aztec organization. He hasn't done anything about it yet, but...
The fourth Level 5 esper, and the leader of ITEM. Her power, Meltdowner, converts electrons into a highly destructive form of matter that exists somewhere between particles and waves. While kind and gentle to her friends, she has a unpleasant personality once angered.
- Action Girl: While reliant on her powers most of the time, she is quite tough and versed in hand-to-hand combat.
- Artificial Limbs: Replaces her missing arm and eye with masses of pure energy and later, literal Artificial Limbs.
- Ax-Crazy: She's calm and casual most of the time, but when angry she lets forth a truly vicious temper."Gya ha ha!! Oh, now where to start burning her? Maybe I should roast that little face of hers. Or maybe I should press against her pink *** and burn it pitch black!! Hey, what do you think, Hamazura? You'd better come out, cause I'm gonna burn her into a black mummy! Or can you still get off to fucking a hole like that!?""I'll count to three. If you don't come out, I'll burn Takitsubo's *** as punishment. Of course, if you'd rather just abandon her, then you can just sit there masturbating to the stench of her virginity being burned away."
- Barrier Warrior: She can make shields of energy that are tough enough to withstand Mikoto's electric attacks.
- Big Damn Heroes: Saves Accelerator in NT Vol 6 when he almost falls victim to Kakine's Shape Shifter Guilt Trip.
- Blood Knight: Battle-hungry? Check. Unnerving temper? Check. Obsesses over Shiage after their fight? Huge check.
- Came Back Wrong: Became even more psycho and unstable than before, with a Yandere crush on her killer, Shiage Hamazura.
- Catch Phrase: Often says Hamazura in an angry tone.
- Character Development: Was once The Social Darwinist who looked down on Level 0's, later accepts Shiage as the better fighter even though he doesn't have powers because he beat her. Becomes much calmer and friendlier in New Testament. Case in point, when Last Order teases her because she can see her panties, Mugino simply laughs and walks away, while the old Mugino would have probably killed her on the spot. She also starts learning how to cook in an effort to be more normal. When a naked Cendrillon appears in her apartment, she takes the whole thing in stride... well, until she loses her temper after Cendrillon teases her about her feelings for Shiage.
- Comedic Sociopathy:
- "I'm the girl who killed your sister. Nice to meet you." — said casually to Frenda's little sister.
- Mugino is pretty good at this, such as this little exchange when she was giving Shiage a countdown to come out before she roasted Rikou. Mugino did not give a nice slow count, as was usual. Instead
- Continuity Cameo: Along with the rest of ITEM, in Episode 12 of Railgun. In the manga version of that scene, there was a completely irrelevant conversation that had nothing to do with the plot.
- Cool Big Sis: To those she considers friends.
- Cute and Psycho: Her default personality.
- Cyborg: As of New Testament, she has one electronic eye and a cybernetic left arm. Her eye at least can be linked into security cameras with some wires.
- Defusing the Tyke Bomb: Shiage beats her twice, learning more about her state of mind in the process. She attacks a third time in what is intended to be a suicide attack by taking Body Crystal, causing her power to cause a sphere of destruction around her temporarily. After this, Shiage considers shooting her but decides not to, opting instead to at least try calming her down. It works.
- Disproportionate Retribution: Her form of payback.
- When Mikoto knocks her out in their fight, she wakes up a few minutes later, pissed about the headache.
- In the Febri arc of the second season of '"Railgun'', she shows up unexpectedly to blow up STUDY's robots simply because they tried to mechanically replicate her abilities.
- She kills Frenda after she gives up ITEM's base of operations to SCHOOL, despite clearly seeing that she was tortured into giving up said location. And then when Shiage decides to leave ITEM and take Rikou with him, her response to that is to try and murder him too.
- Do Not Go Gentle: When she teams with Accelerator against Kakine in NT Vol. 6, she says that maybe Kakine is right that she and Accelerator cannot be redeemed and will still go to Hell no matter what they do. Even so, they shouldn't just give up and die, they might as well kick some ass before they go.
- Don't You Dare Pity Me!: When she succumbs to the Body Crystal's side effects before she can kill Hamazura, she starts screaming at him for giving a pitiful look.
- Effortless Amazonian Lift: Despite being a skinny teenage girl, she can Neck Lift grown men and throw them across the room.
- Even Evil Has Standards: She is sickened and horrified when she sees Fraulein Kreutune apparently eating someone, and remarks that she would have had the same reaction even if she were her old, evil self.
- Evil Cannot Comprehend Good: In Volume 22, she says it doesn't make any sense when Shiage has defeated her for the third time but spares her life. Shiage says that even after everything she's done to him and Rikou, he still cares about her. She calls him an idiot, but agrees to come with him.
- Evil Counterpart: To Misaka Mikoto, look down at the Not So Different below.
- Evil Laugh: "Gya-ha-ha!!"
- Eye Scream: Hamazura rams the edge of Rikou's body crystal case into her eye so hard he ruptures it.
- Fatal Flaw: She has a dual one in Wrath and Pride. Her pride leads her to take risks she doesn't need to, and having her pride hurt causes her to descend into rage that clouds her judgement and leaves her vulnerable to being blindsided. It's because of both of these that Mikoto survived their battle during the Sisters Arc, as well as what leads to ITEM's downfall and her death/defeat by Shiage during the Battle Royale Arc since she couldn't just Know When to Fold 'Em.
- Faux Affably Evil: She's warm and friendly, but it's mostly an act. She's completely okay with murdering her 'friends' if they get in her way. In NT she makes a sort-of HeelFace Turn and is still basically a crazy murderer, but values her friends more.
- Foil: She specializes in destruction while Kakine specializes in creation. Pointed out in NT Vol 6.
- Frickin' Laser Beams: Her entire method of attack revolves around these.
- Beam Spam: Carries special silicon cards to facilitate this effect.
- Convection Schmonvection: Averted. Her beams are incredibly hot, and being near them can fry you.
- Mundane Utility: She can make a ball of energy to light her path.
- Power Incontinence: Her inability to control her own power is what led to her losing her left arm. If she had better control, she'd be the ranked as the third Level 5 instead of the fourth.
- Recoil Boost: She can cushion her fall or launch herself through the air by firing downwards.
- Required Secondary Powers: Subverted. She is not immune to her own powers.
- Sphere of Destruction: Surrounds herself with one in a last-ditch effort to finally defeat Shiage. He stalls until her energy runs out.
- Stuff Blowing Up: The end result of her power.
- Glowing Eyes of Doom: Her right eye, after she loses it in Volume 15 and before she gets an artificial one in New Testament.
- Hair-Trigger Temper: It doesn't take much to piss her off.
- HeelFace Turn: Towards the end of volume 22, when she agrees to help reform ITEM. An assassin thinks this has made her soft. She corrects him quite thoroughly after he steps on one of her berserk buttons. He'll live, though, since Academy City has very good medicine.
- Heroic RRoD: Eventually, she pushes herself so far trying to kill Hamazura that she needs to start taking Body Crystals just to keep up with the stress and damage her body's maintained. Finally, right when she's going for a sure-fire kill, her body just crashes on her and her beams disperse, leaving her barely able to move, much less use her ability.
- He Is Not My Boyfriend: Gets very embarrassed and loses her temper when Cendrillon teases her about her feelings for Shiage.
- Hoist by Their Own Petard: What ultimately defeats Shizuri in her first battle against Shiage is her own power blowing her left arm off.
- Implacable Woman. Seems to be the Level 5 most fond of this, especially during her first fight with Shiage. This backfires when Shiage proves she's Not So Invincible After All.
- It's Personal: In NT Vol 6, The reason why she decides to help Accelerator fight Kakine.And it isn't like I don't have my own reasons to be here. I was attacked by a false Frenda last night. You were the biggest factor of the darkness active at that time and the interest in playing with the dead was the same. I don't know what your purpose in that was, but I'm going to make you pay for disturbing her grave, you piece of shit.
- I Was Just Passing Through: In the final episode of Railgun S, she saves Mikoto from STUDY's robots. She had no idea Mikoto was there. She was just pissed at STUDY using her as a lab rat.
- Know When to Fold 'Em: She might be technically more powerful than Mikoto and therefore want to kill her and take her place, but she's not stupid enough to actually think she can beat Kakine, who is on par with Accelerator. Later subverted when she decides she wants payback, to the point of endangering Takitsubo's life to track down SCHOOL, even though she can't come up with a good response when Shiage points out that she ran away from Kakine twice.
- Lack of Empathy: Cheerfully greets the family of those she has murdered by introducing herself as the murderer. The weird thing is she actually meant well. That's as good as she gets when it comes to attempting to take responsibility for her actions.
- Lady Swears-a-Lot: Her mouth is NOT as beautiful as the rest of her face.
- Laser-Guided Tyke-Bomb: Over the course of numerous fights with Shiage, he comes to the realization that Mugino used to be a mostly normal girl who actually cared about her friends. Academy City just decided she's much more useful as their own personal assassin/enforcer.
- Locked Out of the Loop: Does not know about the Magic side.
- Love Redeems: Played with. Her yandere fixation on Shiage makes her even more dangerous at first, but after he reaches out to her and tries to make amends she reforms at least enough to avoid disappointing him.
- Made of Iron: Her pain threshold is staggering. When fighting Mikoto in Railgun she is only knocked out briefly by a heavy metal doll ramming her head at high speed and actually uses her beams as recoil to survive a fatal fall, wanting to continue the fight despite her obvious heavy injuries. When fighting Hamazura in Volume 15, she endures her eye being ruptured, accidentally blowing off her own arm, and multiple gunshots to her upper body while consumed in rage, only going down with a punch to the face to knock her out.
- Mama Bear: Has become one toward Fremea. In NT Vol. 6, she got really upset when Shiage lost track of her, meaning Fremea was potentially all alone in the city.
- Minor Injury Overreaction: Once went completely berserk after Mikoto gave her a small cut on her temple.
- Modesty Shorts: She only wears these occasionally.
- Ms. Fanservice: In NT2 she says that she's the level 5 in charge of sex appeal so she wears see through underwear.
- Morality Chain: She acts like a good guy around Hamazura and isn't quite as sadistic and murderous even when he isn't around after her HeelFace Turn, but it's mostly just because she doesn't want him to hate her.
- Morality Pet: She's grown protective of Fremea after killing her older sister.
- Murder the Hypotenuse: While trying to get revenge on Shiage, she tried to kill Rikou, because Mugino hates and loves Shiage at the same time. After her HeelFace Turn, she seems to have accepted being #2 in Shiage's harem.
- Names to Run Away from Really Fast: She's a Level 5 esper with an ability dubbed "Meltdowner"...
- Never My Fault: While suffering from the Body Crystal's aftermath, she screams at Hamazura that he's responsible for her life going haywire. Her team falling apart is largely her own fault for outright killing Frenda and hunting down Hamazura for the Body Crystal to make Takitsubo's searching ability go into overdrive with no regard for what happen to her body afterwards.
- Nominal Hero: She is, in theory, an ally in the NT volumes, but she's apathetic, cruel and totally okay with being a brutal killer so long as Hamazura doesn't know about it. She figures that even if he does, he'll forgive her, but does her best not to test that.
- Not So Different: Both she and Mikoto have more in common than they realize: not only do their powers involve manipulation of electrons, but they also come from wealthy families, have an annoying yet lovable sidekick who adores them, are Cool Big Sises to their friends, are smart enough to wear shorts under their skirts to avoid Fanservice, and tend to let their pride and anger win over reason. They would be best friends if they weren't enemies to begin with.
- Oh, Crap!: In New Testament 5, when Frenda seemingly comes back to life and says she wants revenge for Mugino killing her back in Volume 15.
- The Only One Allowed to Defeat You: Towards Mikoto and later Shiage."Don't let pitiful bastards like that take your life. The one who's going to rip you to pieces is me!!"
- The Perfectionist: She always has to be the best and do things perfectly, but when it's clearly impossible she instantly changes her goals to something else to hold up her pride.
- The Power of Love: In NT Vol 6, she declares that she's now running on her love for Shiage instead of her anger and pride, and that she's now stronger than ever.
- "The Reason You Suck" Speech: Gives it to Kakine while pointing out his Fatal Flaw.
- Sanity Has Advantages: If she wasn't so insane, she would have crushed Shiage easily without him being able to do the slightest thing about it. Or would never have ended up fighting him. Or wouldn't have even made an enemy of him in the first place. Sanity definitely has advantages.
- Shock and Awe: Has a very limited control over electricity due to how her power affects electrons, to the extent that she can make Mikoto's electric attacks turn away from her.
- Shut Up, Hannibal!: Combines this with "World of Cardboard" Speech in New Testament Volume 6 when an enemy assumed that her love for Shiage and her guilt over killing Frenda would weaken her. Bonus points for her admitting without shame that she loves him.As long as I have Hamazura, this is fine. I'll get into trouble and into fights. There will even be deadly fights. But it will all work out in the end. No matter how many people I kill and how much I destroy, everything will be resolved in the end somehow and we can all be happy. All my past experiences have shown that to be true. That's how it was during the fight between ITEM and SCHOOL. That's how it was when we fought underground in District 23. That's how it was when we met during the fierce fighting of World War 3. And so I know it will be fine as long as I have Hamazura. No matter what happens, he will forgive me in the end.
- Slasher Smile: Though she is quite fond of Kubrick Stares, Psychotic Smirks, and combinations of the three where applicable.
- The Social Darwinist: Played straight until Volume 22, where she subverts this by lashing out at Academy City's "Parameter List", a cost-control mechanism that restricts funds to unworthy (read: Level 0) students (read: Hamazura) and allocates those funds to more powerful and promising espers.
- Super Reflexes: She's fast enough to escape a bomb going off in her face, and to move away when somebody aims a gun at her.
- Unskilled, but Strong: She's actually better than the #3 Level 5 Misaka in regards to raw firepower, but the latter's abilities provide a wide array of applications while she just has a straightforward laser generator that can (and does) harm her if she isn't careful.
- Villain Ball: It's frequently noted by the novels and Shiage himself that she could easily kill him with one shot of her high-speed, high-power lasers, yet chooses to drag out his suffering for as long as possible, eventually giving him a window to turn the tables on her. This ends up screwing her over in their last battle, as by that point she could easily destroy him, but she's so far gone mentally and determined to drag it out that she starts firing off beams haphazardly and when she goes for the sure-fire kill, her body gives out on her.
- We Have Reserves: How she makes an enemy of Shiage, coupled with the fact that her "expendable" henchman had just tried a You Shall Not Pass! for his sake.
- What the Hell, Hero?: Delivers one to Accelerator, saying that his Death Seeker attitude when it comes to atoning for his sins is just him taking the coward's way out. He takes it to heart, now determined to live to continue protecting his loved ones.
- When All You Have Is a Hammer...: Mikoto makes very good use of the many possible applications of magnetism and electricity. Mugino doesn't. All she has is beams. You'd be surprised how many problems a portable laser cannon can solve.
- Willfully Weak: In terms of direct attacks, she's actually quite a bit more powerful than Mikoto. However, she lacks immunity to her own power and can't handle the recoil from the full use of her ability. If she truly went all-out with an attack, the recoil would kill her.
- Yandere: Towards Shiage, after he defeats her the first time. After her HeelFace Turn, it turns into genuine affection, not that she would ever admit it to his face.
- You Have Got to Be Kidding Me!: When she learns about the Level 6 Shift project, she laughs and says it has to be one of the most ridiculous things she has ever heard.
- Zettai Ryouiki: In the Railgun S opening as well as the incoming episodes.
Second in command of ITEM. Her ability, Offense Armor, allows her to compress and solidify nitrogen in the atmosphere to act as a barrier and is ranked at Level 4.
- A-Cup Angst: She was devastated that she has the smallest cup size in ITEM, even smaller than Frenda's, and when she misinterprets Shiage's reason for Musashino milk for her, she tries to kill him. In chapter 78 (Railgun T, Episode 18), she fights Mikoto over an Indian Poker that was supposed to hold the secret to increase breast size.
- Adaptational Modesty: Her attire in Railgun, compare to her appearance in Index. At least, until Railgun's Dream Ranker arc, which takes place around the Battle Royale arc.
- Affably Evil: She's less sadistic than Mugino and generally professional, but she's completely unfazed by the idea of killing people or watching Mugino torture them.
- Attack Reflector: She can use her nitrogen barriers as a limited version since she graduated from the Dark May Project which studied Accelerator's powers.
- Barrier Warrior: Her ability, Offense Armor, is mostly defensive.
- Blow You Away: Nitrogen makes up 70% of the air, so she can generate small air currents by controlling the nitrogen.
- Buffy Speak: Talks like this almost all the time.
- Child Prodigy: The "honor student" of the Dark May Project.
- Cute Bruiser: It is Offense Armor after all. Her fighting style involves tanking hits, punching people, and throwing cars.
- Evil Counterpart: She has one in Umidori Kuroyoru, her kouhai from the Dark May Project, who first appears in New Testament 1. They have practically the same power, with Umidori's focusing on offense and Saiai's on defense.
- Gosh Darn It to Heck!: Has a habit to say "super" ("ultra" in the dub) in all of her conversations, when she tries to add an expletive. This is due to her past as a subject to the Dark May Project, in which the researchers added some of Accelerator's speech patterns into her mind.
- Immune to Bullets: Her Offense Armor lets her block bullets, which she does with no expression. Afterward, though, it becomes clear that it still really hurts, and sufficiently high-powered shots can stagger her even with a successful block.
- In the Hood: Wears an orange hoodie throughout the Sisters Arc.
- The Law of Diminishing Defensive Effort: Her Offense Armor is so durable that she's completely nonchalant about getting threatened by guns.
- Locked Out of the Loop: Does not know about the magic side.
- Meaningful Name: Her full name translates to "Beloved Silk Flag".
- Never My Fault: Played for Laughs. She tries to beat up Hamazura for seeing her panties, despite teasing him earlier by playfully pulling her sweater up but accidentally flipped it up.
- Senpai Kohai: To Umidori Kuroyoru from their days in the Dark May project.
- She's Got Legs: She doesn't wear anything to cover her legs.
- Signature Sound Effect: In the anime, her ability has the same sound effect with Accelerator's. This foreshadows her being part of the Dark May Project, an experiment done to replicate Accelerator's powers.
- Super Strength: Subverted. To those unaware of her powers, it looks like her power is this, but all she's doing is controlling super-compressed nitrogen gas a few centimeters from her body.
- Sweater Girl: Wears these a lot.
- The Tease: Loves to tease Shiage with her body, then call him a pervert.
- Tyke Bomb: She's twelve years old, and a remnant of the Dark May Project designed to replicate Accelerator's powers. Despite this, however, she's actually pretty mentally stable, especially compared to her kouhai Umidori and even amongst the rest of ITEM.
- Unabashed B-Movie Fan: Loves watching B-movies.
- Verbal Tic: Chou!note
- You Shall Not Pass!: Holds the line when Hisako Yukami attacks her and Shiage with man-eating cockroaches.
A member of ITEM. Her ability, ranked at Level 4, is AIM Stalker, which allows her to trace the AIM fields of other Espers.
- Amplifier Artifact: Body Crystal, a powdery substance that temporarily amplifies the user's abilities.
- Clingy Jealous Girl: Has been developing this as of New Testament, due to the increasing number of girls Hamazura finds himself surrounded by.
- Damsel in Distress: Thanks to the damage to her body by Body Crystal, this is basically her entire role in the plot.
- Ill Girl: As a result of the Applied Phlebotinum.
- Living MacGuffin: After being healed from Body Crystal's damage, she gets hunted by Academy City because her power can now basically render the entire Power Development Curriculum obsolete.
- Locked Out of the Loop: Does not know about the Magic side.
- Nice Girl: She's this in comparison to her friends in ITEM.
- Official Couple: Her and Hamazura.
- Phlebotinum Overdose: Overuse of Body Crystal causes ill effects on the user's abilities, which forces them to use even more of the substance in order to use their powers properly.
- Power Copying: Implied to be how her power is supposed to work after being healed; she can use her ability to replicate the abilities of other espers by controlling their AIM fields.
- Power Incontinence: Her power's weakness is that she has to let it go berserk on its own through the Applied Phlebotinum for it to be useful.
- Rescue Romance: She and Hamazura fall in love after he saves her.
- Sensor Character: The primary use of her power.
- Sleepyhead: Often seen dozing off.
- Spanner in the Works: Her power unknowingly caused the defeat of Teitoku Kakine in NT Vol. 6.
- The Stoic: Rarely shows emotion and maintains a static expression more often than not.
- Sugar-and-Ice Personality: Hardly ever shows emotion, even to her boyfriend, but it is there.
- Super Drowning Skills: As an Ill Girl with poor stamina, she is a poor swimmer. When ITEM relaxes at a pool, she just does the Dead Man's Float.
- Superpower Lottery: After she is healed, it's heavily implied she can now reach Level 5. This would allow her to control the AIM Fields of other Espers. The possibilities of this are pretty much endless.
- Token Good Teammate: She doesn't really want to hurt anyone, though she doesn't care if her friends too. She's only a part of ITEM so she has a place to belong. She's the only member of the group apart from Hamazura to actually show any concern for anyone else.
One of the main combatants of ITEM, she has a knack for explosives and exceptional hand-to-hand capabilities.
- Ascended Extra: She was a minor character who gets quickly killed off after being introduced in Volume 15. Popularity among the fans gives her more prominent development in the Railgun storyline and events that were influenced by her in New Testament.
- Adaptation Expansion: Receives almost no development in the Index storyline as Mugino killed her off fairly quickly after her debut in the novels, but Volume 5 of the Railgun manga rectifies this. Her little sister also becomes a recurring character, she has an 'appearance' of sorts in NT 6 and is involved in the storyline of NT 12.
- Badass Normal: The only one of the four who doesn't have esper abilities, instead she uses a combination of explosives and hand-to-hand combat to fight.
- Beauty Is Never Tarnished: Averted. The anime shows Frenda getting kicked in the face with bruises by Kakine during her interrogation, and they're still present when Mugino finds her. Even before that event, her fight against Yumiya in the Dream Ranker arc shows her losing half of her left ear and getting injured from being shot.
- Big Sister Worship: A non-blood-related example to Mugino, even bragging to Kuroko of the former's superiority over Mikoto.
- Blood Knight: A mild example.
- Call-Forward: Her appearance in Railgun is this in a horrific manner. When fighting against Mikoto after nearly getting her legs blown off, she notes that they are her best feature, and when interrogated, she couldn't spill the beans due to her tongue being paralyzed, and in the final episode of the Railgun S anime, shows a camera shot of only her lower body when relaxing with her teammates by the pool. Now with all of these clues, you can pretty much guess what happens when the events of the Battle Royal Arc comes rolling in.
- A popular Japanese meme is putting slashes or spaces in her name to memorate this.
- Came Back Wrong: In NT 5th volume. Subverted, when it turned out to be a man trying to defeat Mugino with a Shape Shifter Guilt Trip, which failed.
- Cold-Blooded Torture: The anime shows her being casually roughed up by Kakine before she breaks and gives up the info on ITEM.
- Combat Pragmatist: Justified. She'll set traps, use explosives, and anything it would take to win a fight against espers.
- Cool Big Sis: To her little sister Fremea and Kanou Shinka.
- Cute and Psycho: In battle."I said earlier that the target's life is of no interest, but I get a special feeling whenever I end them. That instant when you pluck a life, it feels like I've conquered their destiny. In the end...It's like they were born just to be killed by me."
- D-Cup Distress: Downplayed. She admits that having a bigger breast size is annoying as she'll have to buy new bras instead of things she likes.
- Dies Wide Open: Her eyes are wide-open and blankly staring when Mugino drops what's left of her in front of Hamazura.
- Dirty Coward: Was willing to sell out her team if her life was threatened. This would turn out to be her Fatal Flaw.
- Doomed by Canon: Regardless of her development in Railgun, she still dies by the events of Volume 15 in the Index storyline.
- Ear Ache: Loses half of her left ear against Yumiya in the Dream Ranker arc, but her hair manages to neatly cover it afterward.
- Even Evil Has Loved Ones: She loved her younger sister and made sure to keep Fremea away from the morally dubious and shady nature of the Dark Side. She also has a close sibling-like bond with Kanou Shinka and many acquaintances outside of the Dark Side. Furthermore, while she has no problems with betraying them to save herself when having her life threatened, she does care about her teammates in ITEM.
- Even Evil Has Standards: While she will betray those around her in order to survive, even close friends, it's shown that she doesn't really like it. It's best shown during her fight against Yumiya, where both she and Ruiko is running away from the SCHOOL sniper.
- Girls Love Stuffed Animals: Her bombs take the form of stuffed animals.
- Gratuitous Foreign Language:
- Subverted in her fight against Mikoto. When Frenda is on the losing end, she starts to sing in a language of which the latter couldn't understand despite being trilingual, only for her to explain that it's completely made up before turning the tables.
- Played straight after The Reveal of her heritage as Norwegian; speaking the words ha det branote and deilignote .
- Half the Man He Used to Be: Mugino's expressions of displeasure are very direct. Frenda is very, very unlikely to repeat the mistake of betraying ITEM.
- Hidden Buxom: Downplayed. It's not really noticeable, but chapter 78 of Railgun (Episode 18 of Railgun T) shows Frenda being a bit more endowed after her shower. This leaves Saiai in awe and envy of her own smaller chest.
- Hidden Depths: New Testament 12 reveals that she held a very personal space in the top area of the Dianoid in District 15, where she collected birthday gifts for everyone she knows; even ITEM didn't know where it was. This is where Touma finds the MacGuffin necessary to overthrow St. Germain's machinations on Shinka Kanou.
- Hoist by Her Own Petard: Drops one of the devices she used to ignite the explosive strips after she filled the room with an "explosive mist", screwing over her entire bluff.
- Ineffectual Sympathetic Villain: Although she did rather well in her fight against Mikoto.
- Kick Chick: In the Railgun S animated adaptation at least, she seems to be a Tae-Kwondo practitioner who focuses almost exclusively on kicking in combat, including her preferred Coup De Grace with a bladed shoe.
- Mad Bomber: Minus the mad part. Mostly.
- Mundane Utility: She uses her explosives to open canned food.
- Never Got to Say Goodbye: Justified as Frenda was killed by Mugino during the Battle Royal arc, thus leaving her younger sister, Kanou, Saten, and many other close acquaintances in grief.
- Non-Specifically Foreign: Due to her blonde hair and blue eyes, it's quite apparent that Frenda isn't of Japanese birth, but for the longest time, the series doesn't specify her true nationality. Ruiko also take note of this In-Universe, wondering what country Frenda is from. It's eventually revealed by the Railgun editor, Ogino Kentarou, that Frenda and her younger sister are of Norwegian descent.
- Odd Friendship: She forms a quick one with Ruiko Saten in the Dream Ranker arc, who's also a Level 0 but the latter has an Undying Loyalty to her friends.
- Phenotype Stereotype: She's a caucasian girl of Norwegian descent with blonde hair and blue-eyes.
- Rewarded as a Traitor Deserves: Killed by Mugino for making a deal with SCHOOL, a rival organization, in exchange for her own life during the Battle Royale Arc. She's lucky she lasted that long given that she was about to sell out ITEM to Mikoto during the Sisters Arc and only survived because her tongue was paralyzed and prevented her from speaking.
- She's Got Legs: At least she thinks so, and loves to flaunt them by exclusively using them in combat.
- Stuff Blowing Up: Her specialty.
- Team Normal: Before Shiage join the team, Frenda was the only member of ITEM to not have esper abilities.
- Tears of Fear: In the anime as she's on her knees facing Mugino, who's getting ready to execute her for her betrayal.
- Token Minority: One of the only non-Japanese characters from the Science Side, as she's of Norwegian descent.
- Trademark Favorite Food: Canned mackerel, and later on, mackerel curry.
- Trap Master: She doesn't seem to have any ability, so she relies on setting up explosive dolls and flammable strips against her opponents. In a direct fight, her abilities are only mediocre at best, but by using trickery she can maintain an advantage over those who should stomp her into the pavement.
- Undying Loyalty: Horribly averted. When she couldn't confess to Mikoto when being interrogated, the latter assumes this trope but the readers are already aware that it really isn't.
- Verbal Tic: Kekkyokunote
- Zettai Ryouiki: Spotted sporting this in Railgun S' 17th episode.
- See A Certain Magical Index Protagonists folder.
Academy City's second most powerful Level 5 esper, and the leader of SCHOOL. His ability, Dark Matter, allows him to create entirely new forms of matter that aren't bound by the laws of physics. Kakine's power is hinted to be related to Accelerator's in some way, and he is the only other esper with the potential to become a Level 6. He has a rather one-sided rivalry with Accelerator, with his fondest wish being to defeat him.
- Affably Evil: Provided you don't directly oppose or hinder his objectives, he's actually a half-decent guy.
- And I Must Scream: His brain is preserved and forced to create a constant stream of Dark Matter after his "death" by Accelerator. Happens again in New Testament 8 when he his compressed into a ball, and noted to still be alive in this state. He was later left to sink into the ocean with the Sargasso base.
- Arc Villain: For the Battle Royale Arc overall, a position he technically shares with Saku Tatsuhiko (Tatsuhiko is attempting a full-on rebellion to take over Academy City, while Kakine is the most powerful villainous threat whose own goals are mutually exclusive but more personal towards the other members of the cast).
- Arrogant Kung-Fu Guy: He's incredibly confident in his own power, looks down on everyone else, and hates the fact that Accelerator is stronger than him.
- Asshole Victim/Laser-Guided Karma: He deserved everything Accelerator did to him.
- Awesomeness by Analysis: He can read past events in a given location by examining the impressions left in the surrounding area. He compares this to how a CD stores sound and images by having tracks etched in it. This was how he was able to imitate the Misaka Sisters for his Shape Shifter Guilt Trip.
- Badass Boast: Delivers a lot.Kakine: Are you making fun of me? Cause it sounds to me like you want to become a nice corpse.Kakine: This is a difference in the freedom our powers give us. And that difference is insurmountable for you. I need not even do anything. I do not simply have an infinite supply of Dark Matter. My inspiration also knows no bounds. No matter how many cards you gather in your hand, I can push it back with brute force as numbers means nothing to me. Nothing you do will ever even reach me. To reach me, you first need to climb over the wall of infinity that continues on eternally.Kakine: I don't care who you are. It doesn't matter what you've built up. I'm not interested in what you'll give to the world. Good and evil? Kindness and malice? Gain and loss? Positive and negative? We can let historians decide that a hundred years from now. All I know is what fate you deserve for trying to use me as a tool!!
- Badass Baritone: In the English Dub by being voiced by Daman Mills, which has a booming and suave tone.
- Berserk Button: When he's told his ability — more specifically, his white wings — would have appeal to kids for a demonstration during the Daihaseisai, he wrecks SCHOOL's hideout. Considering his one-sided rivalry with Accelerator, being told you have appeal to kids is the ego equivalent of a kick to the balls. Toaru Kagaku no Dark Matter manga later reveals that this is actually a fresh wound - Ringo Yuzuriha, young girl whom Teitoku recently failed to save, absolutely adored his wings, and this argument reminded him about her death. Ringo's death also reminded Kakine of the death of his childhood friend several years prior, who also similarly adored his wings. In general, comments about his wings is a touchy subject, though he later on brushes off Accelerator insulting his wings twice.
- Kakine is absolutely furious when Accelerator actually shows him mercy after defeating him thanks to Yomikawa. He's unable to understand how someone like Accelerator was able to escape the Dark Side and goes into a hate filled rant while torturing Yomikawa intent on taking everything important away from Accelerator.
- Trying to use, control or manipulate Kakine in any way is a good way to piss off Kakine. When GREMLIN tried to use him to create Gungnir in New Testament 8, he immediately revives himself and tries to destroy the entire island-sized Sargasso base along with them in a fit of rage. Subverted when Othinus turns him into a ball and proceeds to use him anyway.
- Be the Ball: Othinus crushes him into a ball.
- Big Creepy-Crawlies: Post-ressurection, he seems to have taken an interest in creating an army of car-sized bugs.
- Bishounen: Is repeatedly described as beautiful or handsome during his appearances in New Testament.
- Black Eyes of Crazy/Black Eyes of Evil: After his resurrection.
- Brain in a Jar: After his "dismemberment" by Accelerator, both his brain and body are preserved and stored separately. He eventually made a new body out of Dark Matter and was released. His original flesh and blood body was captured by GREMLIN at the end of NT Vol. 6. They use a device to force it to create Dark Matter that they can mold into the sacred spear Gungnir.
- Brilliant, but Lazy: One may even say "Brilliant AND Lazy" in Volume 6 after his resurrection. Both he and Accelerator spend most of the volume trying to read each other's move and plan accordingly. Kakine even goes as far as to choose specific locations and screws with Accelerator's mental state, forcing his Reflection to become useless. However, once he directly faces off against Accelerator and Mugino, Kakine's regeneration and infinite Dark Matter essentially allows him to take everything the two Level 5's have and regenerate from it. The novel makes the point that Accelerator, even with his Black Wings and Mugino simply do not have the power and/or energy to fully destroy him and that Kakine can basically be lazy and outlast them until they either make a mistake and/or run out of energy.
- Came Back Strong: Zig-Zagged example. He took a final level in badass during the last leg of the fight with Accelerator, but it did nothing to save him from his now-berserk opponent tearing him apart. After reviving in New Testament, however, his time as a Brain in a Jar and mastering that newly awakened power to re-create his body allows him to overpower Accelerator and Mugino working together thanks figuring out how to clone himself and regenerate constantly. In the end, he only loses again due to quite-literal internal sabotage.
- Came Back Wrong: As of New Testament 5 he is officially back in the game, but all of his organs are now made with Dark Matter and Dark Matter is now a part of him.
- Combat Pragmatist: Intended to take Last Order hostage as "insurance" against Accelerator, though the latter intercepted him as he was interrogating Uiharu for Last Order's whereabouts, admitting that a fair fight with Accelerator was troublesome (though he still proceeded to fight Accelerator head on). It's revealed in Toaru Kagaku no Dark Matter that Kakine spent a month gathering and analyzing data on Accelerator's calculation patterns in preparation for their eventual fight. In New Testament 6, Dark Matter Kakine's strategy was to stall Accelerator via Zerg Rush and his new immortality until his battery ran out before finishing him off.
- Combo Platter Powers: His ability, Dark Matter, allows him to create and control matter that does not exist in this universe and defies the laws of physics of everything it makes contact with, allowing him to give various new properties to normal matter.
- Equivalent Exchange: Completely averted like a great big middle finger to physics. Dark Matter is explicitly a form of matter that doesn't exist in this universe outside of what Kakine makes with his ability, and the only limit on how much he can make or even what properties it has at any time seems to be his own stamina and imagination.
- Imagination-Based Superpower: Since Kakine can give just about any properties he wants, he can merge his Dark Matter with mundane objects (such as air) to create:
- Attack Reflector: He can even reflect attacks Accelerator threw at him.
- Brainwashing/Deprogram: Kakine can manipulate light and sound to influence the brain's electrical signals. He does this to undo the brainwashing done on Ringo Yuzuriha near the end of Toaru Kagaku no Dark Matter.
- Intangibility: He can selectively phase his Dark Matter through armor and shields to strike only his target.
- Light 'em Up: Seems to be his preferred method of attack. He can fire over 25000 forms of radiation from all over the electromagnetic spectrum. He does this by using Dark Matter constructs to reflect and refract light.
- Nigh-Invulnerability/No-Sell: The Dark Matter constructs he creates around him makes him very hard to damage. He even ignores Accelerator sucker-punching him through a building. He nonchalantly dusts himself off after a brainwashed Ringo drives him face-first into the ground hard enough to displace large chunks of solid rock in Toaru Kagaku no Dark Matter.
- Stuff Blowing Up: The best way of describing how he defeated Kinuhata Saiai.
- Super Strength: Possibly by augmenting his body with Dark Matter.
- Reduced to Dust: How he kills Souji Kihara in the Toaru Kagaku no Dark Matter manga.
- Voluntary Shapeshifting: He is said to inherit Byouri's ability to change into several forms based on cryptids. He doesn't use it until his resurrection, though.
- Power Gives You Wings/Flight: He prefers to manifest his Dark Matter as six white angel-like wings coming out of his back, which Accelerator mocks by calling him a "fairy." When he "awakens", the wings' composition changes slightly, though it's not seen exactly what effects they would have because he gets trashed by Accelerator shortly afterwards.
- Absurdly Sharp Blade: The tips of the wings.
- Fighting a Shadow: If his body is destroyed, he will recreate himself using Dark Matter and return to create even more of it. It's also noted that even the Kakine that Accelerator and Mugino fight in Volume 6 is merely just a portion of the entire system that makes up Kakine Teitoku as a whole. Near the end of New Testament it's revealed that both the 'Kakine' that appeared in New Testament 5 and 6 and Beetle 05 were actually the Dark Matter ability itself becoming sentient, with parts of the original Kakine's personality imprinted on them, being directly compared to the Emanation of Touma.
- Healing Factor/From a Single Cell: He can recreate his body as long as there is even the tiniest particle of Dark Matter.
- Immortal Life Is Cheap: Gets his body repeatedly destroyed by Mugino and Accelerator during their fight, and it doesn't hinder him in the least.
- Self-Duplication: When he succeeded in recreating his body, nothing prevented him from using this power to create a neverending army of his copies to overrun with numbers Accelerator.
- The Power of Creation: Once again, his esper ability lets him make a material that can not only defy the laws of the universe, but also give it specific or even mutually-conflicting properties to make whatever he wants out of it.
- Superpower Lottery: Being able to create a form of matter that does not exist in our universe and can give new properties to mundane things and lets you create human flesh certainly counts. His Dark Matter is one of the few things that can actually break through Accelerator's reflection and in NT Volume 6, it is heavily implied that with time, he could even create and implement entire Personal Realities. Indeed in Volume 8, he ends up producing a holistic Esper.
- Unobtanium: After becoming a Brain in a Jar, the Dark Matter it continuously produces was used as the basis for combat masks equipped on certain Academy City soldiers to create Elite Mooks.
- Curb-Stomp Battle: He spent Volume 15 one-shotting everyone he went up against without getting a scratch, until he went up against Accelerator.
- Death of Personality: Beetle 05 basically erased him and took his place. He later comes back in his old flesh and blood body, only to be stopped by Othinus.
- Determinator: Even being impaled with his own wings by Accelerator is only enough to incapacitate him for a few minutes.
- Evil Counterpart: He's Accelerator with less standards.
- Evil Sounds Raspy: In Japanese, he has a raspy, soft and malicious tone.
- Fatal Flaw: In NT Vol 6, Mugino points out that, despite his immense power, he always loses in the end because he overestimates himself and doesn't know how to quit while he is ahead.
- Foil: To Accelerator. Where Accelerator excels at destruction, Kakine's entire ability revolves around creation. This is actually lampshaded in NT Volume 5. In NT Volume 6, he is compared to Mugino the same way.
- Friend to All Children: After the protective side of him takes over (with Takitsubo's help) in New Testament 6 a rumor spreads which says that any child who is in trouble just needs to call for him and he will show up.
- Heroic Self-Deprecation: A villainous example. He openly refers to himself as a scumbag and a mongrel twice in Volume 15. He also believes he is unable to protect anyone.Kakine: In the end, you're the same as me, unable to protect anyone. And after this, many more will die, killed by a mongrel like me.
- Humanoid Abomination: After his resurrection.
- HeelFace Turn: After Beetle 05 takes control of him.
- Hoist by His Own Petard:
- In Volume 15, Accelerator uses his own Dark Matter against him to finish him off, having learned how to redirect it even before Awakening.
- In NT Vol 6, he spreads his consciousness too thin, allowing one of the rhinoceros beetles he created to develop free will and then take him over.
- Jack Bauer Interrogation Technique: When Uiharu wouldn't tell him the location of Last Order, he tries to get the information out of her by stomping on her shoulder, dislocating it, and continuing to put pressure on it. In the anime, this is also how he 'persuades' Frenda to reveal the location of ITEM's hideout.
- Jerkass: Even worse than Accelerator.
- Lack of Empathy: Just as much as, if not more than, Accelerator.
- Light Is Not Good: Despite his angelic appearance and using weaponized light as his main attack, Kakine isn't a very nice person.
- Meaningful Name: His name can roughly be translated as "Emperor of the Front Fence".
- Not Worth Killing/Pragmatic Villainy: He has absolutely no compassion or remorse, but he will sometimes leave his opponents alive if they are completely helpless or already dying, just because he thinks it would be beneath him to waste energy on them. Such is the case when he realizes Rikou is dying from Body Crystal overuse and Shiage can't do anything to hurt him, so he just leaves the ITEM base despite his original goal being to kill Rikou due to her AIM Stalker ability.
- Obviously Evil: He wears a dark maroon suit and most of the time has an evil grin on his face, so it makes you clear that he isn't a nice guy at all even if he's pretending to be.
- Our Angels Are Different: He's the only other Esper aside from Accelerator who has the potential to "Awaken" and reach Level 6 naturally, while Mikoto only did so through outside means. Despite this, his "complete" Awakening still loses to Accelerator's uncontrolled one.
- Our Dark Matter Is Mysterious: His "Dark Matter" isn't really what science knows as dark matter (which theoretically should exist). He defines it as matter that just plain doesn't exist outside of his power.Kakine: The Dark Matter that I produce is a substance that does not exist in this world. I don't mean it hasn't been discovered, but that it should theoretically exist; I mean, it actually does not exist. Matter that doesn't exist operates under laws which don't exist. Like say, turning the light from the sun into rays that can kill a man.
- Person of Mass Destruction: If not for Othinus' intervention, he likely would have destroyed the entire island-sized Sargasso along with the remaining GREMLIN members in a fit of rage.
- Pet the Dog: His interactions with Ringo Yuzuriha in Toaru Kagaku no Dark Matter.
- Pitiful Worms: Uses this line on Accelerator at one point.Kakine: Be crushed by the symbol of your own sins and die, you worm.
- Phlebotinum-Handling Equipment/Tricked-Out Gloves: Wields the Pincet Glove aka Tweezers, which allow the wearer to pick up and manipulate microscopic things like nanobots. The Pincet Glove used to be a very bulky and impractical device, but Kakine modified it to comfortably fit on his hand.
- Protectorate: Beetle 05 has vowed to protect Fremea Seivelun.
- Punch-Clock Villain: When he's not hired for something, he's somewhat normal.
- Redemption Demotion: After the Split-Personality Takeover, he does not actively use Self-Duplication to prevent his previous personality from taking over.
- Satellite Character: His entire character is defined by his relationship with, and inferiority to, Accelerator.
- Always Second Best/Always Someone Better: Despite his immense power, Accelerator is number 1 and he's number 2. This gets rammed home when they both "Awaken" during their first battle, yet Kakine still loses despite fully mastering his power and Accelerator being reduced to an unthinking Unstoppable Rage.
- Green-Eyed Monster: It eventually leads to his downfall.
- Not So Different: At least that's what he thought, and before Accelerator met Touma and Last Order, he might have even been right. Volume 15 heavily implies that much like Accelerator, Kakine too went through something difficult that turned him into the bitter person he is today. His own spinoff manga finally sheds light on it and reveals Kakine is effectively an Accelerator that failed to save the people he cared about.
- The Only One Allowed to Defeat You: Toward Accelerator.
- The Resenter: Toward Accelerator.
- Unknown Rival: Accelerator didn't really care about him until he made it personal by hurting Yomikawa.
- Shape Shifter Guilt Trip: In NT Vol 6, after Accelerator effortlessly destroys his army of copies, he then makes an army of copies that look, sound, and act like the Misaka Sisters. Accelerator falls into despair, unable to harm them, and is almost killed until Mugino steps in and reminds him that they aren't actually the Misaka Sisters, just extensions of Kakine. This restores Accelerator's will to fight.
- Split-Personality Takeover: In NT Vol 6, one of the rhinoceros beetles he created, Beetle 05, develops free will. Not wanting to harm anyone, it gains the strength to take control over all of Kakine's creations. It disintegrates them, then transforms into Kakine and declares he is now him. Accelerator and Mugino muse that this beetle must have held the part of Kakine's personality that actually cared about others, buried deep down.
- Ungrateful Bastard: Stabs Yomikawa just after she saves his life from Accelerator.
- Unwitting Pawn: His hatred and envy of Accelerator was nurtured and encouraged by Crowley. He was also intended to act as a spare part in Crowley's plan, in case Accelerator failed to live up to his expectations.
- Villain Ball: Stabbing Yomikawa just to piss off Accelerator.
- The Worf Effect: As soon as the original Kakine comes back to life, Othinus crushes him.
- "World of Cardboard" Speech: Not him actually, but his creation Beetle 05. When Beetle 05 starts to develop free will, Kakine mocks him and starts to subsume him, saying he has no hope of becoming anything more than Kakine. Beetle 05 thinks it over, then says that's right, he has no hope of becoming anything more than Kakine. See Split-Personality Takeover.
- Would Hit a Girl: Let's see: He fights with and defeats Mugino, beats the shit out of Frenda (only in the anime) to get the information he wants, attacks both Saiai and Rikou and leaves them for dead, nearly kills Uiharu, wanted to use the innocent and adorable Last Order as bait so he could have a glorified pissing match with Accelerator, and then stabs Yomikawa after she saves his ass from Accelerator.
- Zerg Rush: His strategy to fight Accelerator in New Testament Volume 6, sending his neverending army of copies against him.
Girl in the dress
A member of SCHOOL, and the only one to survive intact after the events of the Battle Royale arc. Her ability is "Measure Heart", the ability to regulate the distance between peoples' minds (hearts).
- Charm Person: This is basically her power. Measure Heart allows her to manipulate the emotional distance between her and her targets, allowing her to dictate how her targets feel about her.
- Cloud Cuckoolander: While mostly composed, her legitimate question to Kakine about if Hamazura could possibly have disguised himself as a young mother or a baby can raise some eyebrows.
- Combat Pragmatist: Attempts to kill Hamazura, Takitsubo, and Mugino with a wrecking ball while they're driving in their van and unprepared, and gets really close to succeeding.
- Family Theme Naming: Kaibi's younger sister is named Amazora and her older sister is named Rikuri. Their names contain the Japanese words for Sea, Sky, and Land, respectively.
- Fights Like a Normal: Her esper power, while more useful than at a glance, isn't very offensive-based, but she makes up for it with proficiency in firearms and being fit enough she could keep pace with a running Shiage with seemingly no effort.
- Glowing Eyes of Doom: Her eyes glow a faint pink when she's using her powers on someone, a fitting color for a Charm Person.
- Gold Digger: Somewhat. She scams money out of lonely workers by comforting them, but she stops before anything more happens between them. Basically it is Compensated Dating on her terms.
- Grenade Launcher: A 40 mm one to be exact, and it's small enough to be wielded like a pistol!
- The Gunslinger: Wields a handgun and a small 40mm grenade launcher.
- No Name Given: She was unnamed for a long time, only referred to as "Girl in the dress". It was not until late 2019, when the side story novel released in the limited editions of the Accelerator anime DVDs that not only her name was revealed, but that she also has both a younger and an older sister who are fellow assassins.
- Telepathy: Since her power involves mental manipulation, it's a kind of applied telepathy.
- What Kind of Lame Power Is Heart, Anyway?: Her ability regulates the distance between peoples' hearts...
- Heart Is an Awesome Power: ...which she can use to confuse enemies by making her distance identical to someone else's. For example, when Shiage points a gun at her, she makes her heart identical to Rikou's, causing Shiage to hesitate to pull the trigger. Objectively, Shiage knows Measure Heart is different from Rikou, but his heart is telling him he's targeting Rikou. On the other hand, she notes that some targets will go berserk and attack you harder because seeing a loved one as an enemy result in a betrayal response. This is why she does not go with Kakine to help against Accelerator: She reasonably enough thinks he might be that type. Her power is so dangerous that Mugino is wary of fighting her.
- Emotion Bomb: Again, she makes people feel like she is their loved one.
- Shape Shifter Guilt Trip: Minus the shapeshifting.
- Soft-Spoken Sadist: She normally speaks in a gentle tone when she is calm in order to fake warmth and kindness.
Boy with goggles
An agent for SCHOOL, he was the first member of the unit to be killed in action. He's always seen in action with a pair of metallic goggles that is placed over his head like the rings of Saturn, powered with a machine on his back. Banka's a Level 4 Psychokinesist.
- Amplifier Artifact: Besides being able to interface with computers to extract and analyze data, his weird goggles can amplify his esper power and give him more applications like creating fire, turning invisible, erasing noise, manipulating electronics, etc.
- Killed Offscreen: Killed by Mugino, who throws his bloodied googles to Hamazura as proof of his death. His death is briefly seen in the manga adaptation of the arc, which shows the end of his fight with Mugino.
- Mind over Matter: His esper power is Level 4 Psychokinesis, and he is powerful enough to slice a van in half with a wave of his hand.
- No Name Given: Was simply referred to as the Boy with goggles in the novel, with his real name revealed years after in Railgun.
- The Quiet One: Doesn't talk in the anime adaptation of his debut arc, while in the novel he only had three short lines. He gets more lines in Railgun manga, however, which is also kept in the anime adaptation this time.
- Trauma Button: In the past Banka tried to defeat Kakine in a fight to earn the title of Level 5, as he was confident his versatile and powerful ability made him an equal to them. He was soundly beaten and now he gets nauseous when he sees Kakine get angry.
The group's main sniper before she got killed in action, she's known to be a student of the Private Shidarezakura Academy.
- A-Cup Angst: The anime reveals that Yumiya also has issues with her breast size, which is ironic considering her large chest.
- Adaptational Early Appearance: She appears one chapter earlier in the anime via a Dream Ranker card that Mikoto used.
- Boobs of Steel: She has a large bust and is capable of fighting against Frenda in hand-to-hand combat to an extent.
- Blood Knight: Like Frenda, she's a mild example.
- Cold Sniper: Yumiya treats her missions very seriously and displays sadism when chasing her targets.
- Curb-Stomp Battle: She pretty much has the advantage against Frenda in her attempt to assassinate her, but her sadism and brief distraction was all the latter needs to turn the tide in her favor.
- Cute and Psycho: Best shown in her battle against Frenda, where the latter invokes a Not So Different.
- Expy: Her appearance and some of her mannerisms are based on Asuka Sohryu.
- Evil Cannot Comprehend Good: She believes that friendship is superficial and thought that Frenda had no problems with collateral damage along with abandoning Ruiko after they escape from her pursuit. Unknown to her, Frenda does have reservations against involving citizens and Ruiko volunteer to become a decoy which ends with Yumiya getting defeated by the former.
- Eye Scream: Loses her left eye after surviving from being blown up by Frenda.
- Facial Horror: After getting three small explosives shoved her mouth along with a couple of other doll bombs detonating around her by Frenda, she has to wear a neck brace that covers half of her face (coupled with a voice box prosthesis) from the neck up.
- Foregone Conclusion: Her appearance in Railgun takes place before the Battle Royale arc, before she was killed by ITEM.
- Hidden Depths: She admits (and shown through an Indian Poker Card that belongs to her) that she aspires to be an idol.
- Hidden in Plain Sight: Unlike other snipers, Yumiya can hide within a crowd and shoots her target without being spotted by anyone, partially thanks to her silenced Hidden Weapons, but mostly because she acts completely natural when on the job and doesn't break character from how a person minding their own business would. It's only when she outs herself by reacting to Saten carrying around (dummy) doll explosives that Frenda is able to find her.
- Hidden Weapons: She has a collapsible sniper rifle hidden within her long sleeves, which fires bullets via the force of compressed carbon dioxide gas to make them silenced, not emit a muzzle flash, or heat up the barrels that would hurt her from exposure.
- Killed Offscreen: By Mugino prior to the Battle Royal arc.
- Near-Villain Victory: She almost manages to kill Frenda and Ruiko without having to be seen, but her brief distraction of seeing her classmates walking by allows the duo to plan against her.
- No One Could Survive That!: In Railgun, Frenda defeated her by putting bombs into her mouth and pushing her off a building. And to top it off, she throws several more bombs at her. Somehow, she survives this encounter (due to being saved by Yobou) before being killed off-screen before the Battle Royale arc.
- Not So Different: Frenda notes that Yumiya's method of hunting (the type that takes delight in making their prey withe in pain while flaunting their skills) is not much different from hers.
- The Nose Knows: She can smell her prey from a distance.
- It's Personal: Played With. According to herself, she doesn't hold a grudge against Frenda after her defeat but still wanted to track her down while developing a twisted form of friendship towards her.
- Sanity Slippage: After her defeat by Frenda, she becomes notably unhinged.
- Scarily Competent Tracker: She freaks out Frenda so much because she's able to track her down in a crowd.
- Scars Are Forever: Subverted. Despite having her beautiful face messed up from Frenda's explosives, the Academy City can restore it through a regenerative treatment.
- Shrinking Violet: At school, Yumiya is a shy girl who easily stutters whenever someone tries to converse with her.
- Villain with Good Publicity: Yumiya's known to be a Shidarezakura Academy student, and she's considered a School Idol among her classmates. Ironically, because of her shyness and poor social skills, she has no friends among her peers.
- Why Don't You Just Shoot Him?: It should be noted that Yumiya could've easily killed both Frenda and Ruiko thanks to her Hidden Weapons and her ability to hide in the crowd, but her sadism in hunting her targets leads her to unnecessarily drag out their suffering in a game of cat and mouse, which gives the duo a chance escapes her pursuit and turn the tables against her.
A replacement sniper hired by SCHOOL after their previous sniper was killed by ITEM. He is known to be a mentor figure to Stephanie Gorgeouspalace.
- Big Brother Mentor: To Stephanie Gorgeouspalace.
- Cold Sniper: In contrast to Stephanie Gorgeouspalace.
- Hired Guns: He was recruited by ITEM to serve as their sniper.
- In Uiharu's SS, Anti-Skill recruited him to assist their snipers in disabling a hijacked truck.
- Mentor Occupational Hazard: Subverted. He survives the explosion, but he is grievously wounded and kept by Thomas Platinaburg as a bargaining chip to hire Stephanie.
- Tempting Fate: He once said that he'll never be killed in an explosion no matter what. Cue Saiai bringing in an anti-tank warhead.
The leader of BLOCK. He is responsible for getting the group involved in the Battle Royale Arc by hiring mercenaries as part of boosting the group's manpower.
- Arc Villain: For the Battle Royale Arc overall with his intent to try and take over the city with his mercenaries and kill Aleister, a position he technically shares with Kakine (who has his own agenda mutually exclusive from Saku).
- Bad Boss: He'd dispose of anyone who doesn't provide anything useful to BLOCK. This eventually earns him a brutal take-down from his Number Two.
- Big Bad Wannabe: When the fight with GROUP goes down, Megumi has enough of his shit and takes him out herself before fighting Motoharu and Awaki while he lays unconscious in a pool of his own blood. So much for being the man who would take down Aleister.
- We Have Reserves: Saku was able to recruit a lot of mercenaries to help take control of Academy City... Until most of them were taken out early thanks to Etzali.
- Would Hurt a Child: Has no problems with potentially killing some of their planned esper hostages (who are usually around at most teenagers) in using explosives to break them out, stating that since there are 38, one or two dead isn't that big a loss.
- You Have Outlived Your Usefulness: In the light novel, Tetsumou losing the fingers on her hand and being unable to use her ability to read minds has him order his men to take care of her and stating they don't have time to find a replacement, though he doesn't actually have her killed and just removed.
An ex-Anti-Skill officer, she was acquainted with Tatsuhiko prior to her recruitment to BLOCK. She serves as the second-in-command of the group and was involved in the attacks on the city after the 0930 Incident.
- Action Girl/Dark Action Girl: Depending on how you see Teshio before or after the events of the Battle Royale Arc.
- Badass Normal: As an ex-Anti-Skill, she is trained in martial arts enough to neutralize espers. She's able to wipe the floor with both Awaki and Motoharu and only loses thanks to Awaki taking massive risks in using her Move Point powers on herself while AIM Jammers are active.
- Bare Your Midriff: Has a camouflage-patterned top that does this.
- Dark and Troubled Past: She experienced a tragedy while she was a member of Anti-Skill, which is what drives her to meet with and try to kill Aleister, as she wants to ask him if he is responsible for said incident. The specifics of the tragedy are unknown, but when Tetsumou reads her during a security check she is left quite unnerved by what she sees in her past, and Megumi warns her of looking into it.Megumi: " You dont have to read that far. Why that kid has no parents and cant speak isnt an enjoyable past to see."
- Expy: The artist said she's one of Motoko Kusanagi from Ghost in the Shell: Stand Alone Complex.
- Impaled with Extreme Prejudice: Subverted. It looks like Awaki stabbed her in the gut with her stake/nails in order to defeat her, but she actually used the flat end of her weapon for a painful (but bloodless) gut blow to incapacitate her.
- Never Hurt an Innocent: A code she likely carried over from her Anti-Skill days, as she protests at the thought of harming the hostages BLOCK takes to try and force Awaki into helping them (and only agreed to hostages in the first place because she thought it necessary to get Awaki to the table). When Saku tries to force the issue, she takes him out herself.
- Number Two: For BLOCK before it was eventually disbanded.
A BLOCK agent and one of the members responsible for planning their operations against Crowley alongside Tatsuhiko.
- Kill and Replace: Etzali does this to him to infiltrate BLOCK during the Battle Royale Arc.
A BLOCK esper agent, she specializes in weeding out potential moles and double agents within the ranks of BLOCK with the help of her skill "Skill Polygraph".
- Fingore: To keep her from seeing through his disguise in the light novel, Etzali tricks a Mook into rubbing an explosive onto his hand so that, when she tries to read his mind before Etzali's, the explosion tears off some of her fingers.
- Spared by the Adaptation: Zig-Zagged. In the anime, she doesn't get her fingers blown off (presumably since she wasn't ordered to start reading minds to weed out traitors) but she does get shot at by a Six Wings attack helicopter when Etzali ruins the attempt to let the mercenaries in and gets caught in an explosion that sends her flying and knocks her out.
- Telepathy: Tetsumou uses this to determine if a BLOCK agent is a mole/double agent or not, which she does by touching hands with her target.
The elderly, unnamed leader of MEMBER.
- Einstein Hair: His hair is messy like Einstein's and he's a scientist.
- Evil Gloating: He goes on a monologue about what the Mimosa are to Kakine and his love of mathematical formulas over art...but then Kakine gets impatient (complete with sigh!) and proceeds to break through the Mimosa surrounding him and just attack with his Dark Matter. This happens only in the anime, though, where he decides to confront Kakine face to face. In the novel he sends the Mimosa after Kakine and his driver from outside the building, and the monologue about formulas is instead a talk he has with Baba Yoshio while assuming Kakine has already been killed by the weapon.
- Measuring the Marigolds: Whenever he looks at art, a landmark, or a natural wonder, he sees not its natural beauty, but its inherent mathematical formulas. He considers those to be beautiful.
- Nanomachines: Kakine initially identifies Professor's weapon, Mimosa, to be these. However, Professor explains that they are not, as they lack circuitry and power. Mimosa are merely microscopic bits of reflective alloy that can be deployed via microorganisms in the air and controlled with various frequencies to enter people and tear them apart from the inside out one cell at a time. Unfortunately for him, Kakine had the means to detect them and used his ability to fend them off before killing the Professor.
- No Name Given: He is only referred to as the Professor.
- Secret Keeper: The only member of MEMBER who knew that Xochitl was from the magic side.
- Smug Snake: He believed Mimosa was all he would need to kill Kakine. Boy, was he wrong, and he paid for it with his life.
- Undying Loyalty: To Aleister and Academy City. He goes after Kakine specifically because Kakine is going out his way to try and subvert Aleister by stealing the Tweezers and using them to break into the UNDER_LINE.
A hacker who works for MEMBER. He supports the professor from a shelter known as "Summer Resort" with his remote controlled animal robots. He also appears in the Railgun Daihaseisai Arc when he tries to capture a SISTER clone.
- Awesomeness by Analysis: Analyzes and develops counters to an esper's abilities.
- Combat Pragmatist: Attacks people from a distance with his robots.
- The Cracker: Part of what he does as Mission Control.
- Fat Bastard: He's got noticeable chub, and it both denotes his Non-Action Guy status and how he's a Smug Snake Jerkass.
- Freudian Excuse: He was bullied and people wouldn't trust him, so he doesn't trust anyone and likes to make people suffer.
- Jerkass: Looks down on and insults everybody.
- Left for Dead: The last time we saw him the underground shelter he was using in Volume 15 is flooded, presumably by SCHOOL. By this point the Professor is dead, Saraku incapacitated or close to death, and Xochitl basically tells him when he calls her that he's expendable and she doesn't have time to clean up his mess before abandoning him. The communication lines shortly afterwards end up cut, so he can't even call their subordinate groups to get him. This leaves him trapped with no method of escaping drowning.
- Mission Control: Often assumes this role, most because he's useless himself in a straight fight.
- Non-Action Guy: He doesn't seem to be in shape physically and lacks any apparent esper ability, so he relies on robots and his mind to fight for him. When those are gone or prove inadequate, he completely soils himself.
- Robot Master: Uses robotic Great Danes to fight for him, and robotic mosquitoes for more covert actions. He also has an unwieldy robotic praying mantis if he really needs the extra firepower.
- Smug Snake:
- Is a bit too overconfident, both in his robots and in MEMBER as a whole, thinking their members have a chance at beating the top 2 Level 5s in the city with cheap tricks and robots. He's basically pissing himself as things quickly go to hell for them.
- Railgun shows he wasn't much better before that point. He's all talk until Mikoto's friends deal with his robots, and then he's left pissing himself when a calm yet furious Mikoto comes after his giant praying mantis robot and tears it apart, grabbing the communication lines and telling him in no uncertain terms that if she wasn't busy trying to find the kidnapped Misaka Imouto and had reason to suspect Misaki was controlling him, she'd hunt him down and make him suffer (and adding that she will if she ever catches a whiff of any of his robots coming near her or her friends again).
The Corpse Specialist
A sorcerer from the Aztec organization Return of the Winged One, punished by being ordered to infiltrate Academy City and kill Etzali (the fake Unabara Mitsuki), joining MEMBER in the process. The Professor seems to be aware that she is a sorcerer. She was also a protagonist in Railgun SS.
- Barely-There Swimwear: In the Railgun SS. When she convinces Saten to get her a bikini to move around unnoticed in, Saten gives her something that Kuroko would wear...In fact, see for yourself◊. Her measurements are "84, 58, 81" for the record.
- Big Damn Heroes: Three times. She saved Saten from being killed by Olive Holiday and being crushed in the Railgun SS, and from Kouzaku Mitori in the Railgun manga.
- Cool Airship: The Mixcoatl
- Cool Sword: "Macuahuitl", a sword that's used to saw through human bodies.
- Awesome, but Impractical: Etzali makes use of the fact that a sword used to saw through human bodies isn't well suited for slashing through them directly and takes a blow to his already injured arm so he can catch the sword and close the distance to punch her.
- Hammerspace: One of her abilities, such as where she stores her Macuahuitl.
- Master of Disguise: Like Etzali, she can use the skin of others to disguise herself.
- Meaningful Name: Nahuatl for "flower".
- Odd Friendship: With Saten.
- Rewarded as a Traitor Deserves: After going against her superior's orders by teaming up with Mikoto in the Railgun SS.
- Body Horror: A grimoire was forcefully pushed onto her body, turning a huge portion of her body to dust and was replacing it with artificial tissue.
- Senpai Kouhai: A junior to Etzali, and it's all but stated she's romantically interested in him given how she reacts when she learns about how he feels for Mikoto.
- Necromancer: Her original magic centered around speaking with the dead.
- Used to Be a Sweet Kid: Etzali described her as afraid of violence, however when the Grimoire was implanted...
- Wild Card: Given she is a Double Agent. She doesn't hesitate to leave Yoshio trapped and presumably drown in order to get at Etzali.
A girl who acts as a liaison between MEMBER and the Board of Directors. She first appears in the Railgun version of the Daihaseisai Arc. She's a level 4 with the ability Liquid Shadow, which allows her to control liquids with a gravity of 20 or higher; her preferences being liquid metal.
- Absurd Cutting Power: Her puppet can easily slice through metal.
- Affectionate Nickname: She was the original "Mi-chan", the friend of Misaka's clone Dolly, before the researchers replaced Mitori with Misaki after the former threatened to expose the lab for their inhumane research.
- Combat Tentacles: She typically have her puppet form bladed whips from its limbs or fire them from its body for a surprise attack.
- Dark and Troubled Past: As a child, she was Dolly's best friend Mi-chan, who stopped visiting her after she was horrified by Dolly's life-support implants. She tried to have Dolly rescued from the facility by arranging a terrorist attack, but failed and was locked up in the Reformatory (juvenile hall). It was here that she was recruited into the Dark Side.
- Death Faked for You: This occurred when she was recruited from the Reformatory.
- Double Agent: Despite ostensibly being a liaison between MEMBER and the Board of the Directors, the Professor discovers she's been faking orders to use MEMBER's resources for herself for some time now. This is what prompts Xochitl to disobey her orders to kill Saten.
- Extra-ore-dinary: Her power involves being able to manipulate a mass of liquid metal to the point she can make it act like a Body Double and Remote Body.
- Evil Cannot Comprehend Good: Remarks that she thinks people who live peaceful lives are "oddities".
- Expy: Her liquid metal clone is an obvious nod to the liquid metal terminator.
- Far East Asian Terrorists: Was convicted of conducting terrorist activities in Academy City before she got locked up in the Reformatory.
- Genki Girl: She acts eternally cheerful because she has been in the Dark Side so long she has become desensitized to it.
- Girlish Pigtails: As seen in the picture. She started wearing them to honor Dolly because she loved brushing Mitori's hair into that shape.
- HeelFace Turn: After Misaki shows Dolly's current location and reunited with her, she became an informant to Misaki.
- Knife Nut: Her weapon of choice.
- Logical Weakness: Since her puppet is made of metal, it doesn't any functional eyes or noses for detecting enemies. Mitori compensates for this by having the puppet wear a camera in its skull pendant, while the puppet itself can sense vibrations so sensitively it can accurately detect heartbeats from at least several meters away. Kuroko takes advantage of this by first destroying the camera to deprive it of sight, and then activating an anti-eavesdropping device made for Judgement members that emits a powerful sonic hum to overwhelm the puppet's senses and cause it to flail about blindly, leaving it unable to detect her teleporting away to confront Mitori herself before it can find and destroy the device. The second time she does it the puppet manages to attack her regardless, but Kuroko deduces from the way it attacked that it only managed this because Mitori herself saw Kuroko with her own eyes, meaning she's right where she wants her for a confrontation anyways.
- Only Friend: Dolly, the only person who could make her truly smile.
- Out-Gambitted: Twice by Kuroko. The first time was when she realized too late that the cameras she hacked into to give her visual output after Kuroko destroyed her puppet's pendant camera and used the sonic vibrations to deal with its hearing were in turn hacked by Uiharu to give false imaging. The second time is when Kuroko undergoes a Deliberate Injury Gambit to get stabbed through the hand rather than teleporting like expected and thus being vulnerable to the real killing blow, making Mitori hesitate in shock for the valuable seconds Kuroko needed to close the distance and take her out.
- Remote Body: Her ability allows her to make and control one from a kind of liquid metal. At her level, she is even capable of camouflaging its body to exactly like her, minus the hair, which she substitutes with a wig. It reverts to a puddle if she gets too far away from it. She can hear but not see through the puppet, but compensates by having the puppet carry a video camera.
- Revenge Before Reason: Her main goal is to kill Aleister Crowley for his role in what happened to Dolly. Unfortunately for her, Aleister is so far above her he might as well be an untouchable god, and the reason she joined forces with Gensei is because she wanted to use the burgeoning Level 6 Mikoto to destroy the Windowless Building and Aleister. She considers the deaths of everyone else in Academy City as acceptable sacrifices to achieve this.
- Shapeshifter Weapon: Her liquid metal clone can form knives and other weapons from its mass.
- Skeletons in the Coat Closet: She and her puppet wear skull chokers. They're actually cameras for her to direct her puppet from afar.
- Stepford Smiler: As a child, she acted cheerful even though she could not stand the researchers because it made them trust and underestimate her. It was only around Dolly did those smiles become genuine.
- Unperson: After her recruitment to the Dark Side, her records were expunged and she was officially declared dead. This helped concealed her location and the nature of her ability.
- Used to Be a Sweet Kid: She really was a kind person in her youth, even if she at least partially aware of how little personal care the Academy City researchers had for espers. Learning the Awful Truth about Dolly, the Radio Noise project, the fact it was all signed off by the Board of Directors, and that ultimately to most researchers clones and espers are just research fodder is what made her go off the deep end.
- Villainous Breakdown: She has a pretty hard one when cornered by Kuroko and realizing that despite her precautions she's about to lose. When Misaki encounters her later, she's all but unresponsive and can't even muster the will to escape her own handcuffs, and it's only the hope of meeting the clone of Dolly that gets her back into action.
- What Beautiful Eyes!: Gensei Kihara said this about her, because her eyes were full of hatred.
- Whip It Good: Carries a riding crop. It also doubles as a microphone/voice modulator to help disguise her voice.
- You Gotta Have Blue Hair: Purple hair, to be exact, along with purple eyes.
A MEMBER operative with a Level 3 teleportation ability.
- All Men Are Perverts: He has a cameo in Railgun's "Dream Ranker" arc, where he buys special cards from Pierce Aogami that allow him to experience Erotic Dreams with various celebrity women.
- Combat Pragmatist: He will do anything to gain the advantage, including threatening civilians and using them as shields.
- Crippling Overspecialization: His teleportation ability only lets him appear behind a person, and only those in his line of sight. Once his opponent can predict him and block his attempts to stab them in the back, his ability becomes relatively useless, and even worse, if there isn't someone in his line of sight farther away, he can't even try to beat a hasty retreat.
- Death by Adaptation: Implied. Accelerator shoots him multiple times, but in the light novels the Professor notes that he was only heavily incapacitated, not killed, and wanted Yoshio to retrieve him if they had time. In the anime, however, it cuts away after Accelerator shoots him one last time, and the Professor is killed fighting Kakine shortly afterwards and no more mention is made of him, leaving Saraku's fate an Uncertain Doom at best.
- In-Series Nickname: Accelerator nicknames him Kill Point for his ability. Afterwards, the Professor uses it too.
- In the Back: Since he can only teleport directly behind people, this is his primary fighting style.
- Logical Weakness: Since he can only teleport directly behind people, the fewer people are in an area, the fewer his options are, and he becomes predictable.
- Smug Snake: He seems to think his ability makes him unbeatable. Once Accelerator proves this is not true, he quickly panics, trying desperately to escape as Accelerator pumps rounds into his body.
- Teleportation: However, since he lacks the expertise in 11th dimensional calculations, he can only teleport using other people as a reference, and he can only materialize directly behind them.
A member of STUDY, he acts as the group's second-in-command alongside Haruki whenever he's not present. He's a known expert in the field of development biology. He is familiar with piloting mechs when needed in a combat situation alongside Kenji.
- Badass Bookworm: Pilots a mech to take out Judgement officers.
- Far East Asian Terrorists: Becomes one in STUDY when he joins in the revolt against the city's board of directors (and to an extent, to Crowley).
- Would Hit a Girl: Has no qualms killing female Judgement officers if it helps in their revolt.
A member of STUDY, he mostly stays inside their headquarters to oversee the group's plans.
A member of STUDY, he specializes in the field of Chemical Android R&D. He is familiar with piloting mechs when needed in a combat situation alongside Shunichi.
- Badass Bookworm: Pilots a mech to take out Judgement officers.
- Far East Asian Terrorists: Becomes one in STUDY when he joins in the revolt against the city's board of directors (and to an extent, to Crowley).
- Would Hit a Girl: Has no qualms killing female Judgement officers if it helps in their revolt.
The only female member of STUDY (That is, before Shinobu was "recruited"), she specializes in the field of molecular biology. She is very close to Haruki. Like Hirotada, she usually stays in their headquarters to oversee the group's plans.
- Far East Asian Terrorists: Becomes one in STUDY when she joins in the revolt against the city's board of directors (and to an extent, to Crowley).
Umidori Kuroyoru is a sadistic girl and a remnant of the Dark May project who leads the mysterious Freshmen.
- Abusive Parents: Played for laughs, Misaka Worst "adopted" her. And what does she do first? She constantly loves taking control of her like some puppet master, and makes her cry. Yeah...some mother of the year.
- Awesomeness by Analysis: Uses Kihara Amata's vector values and inputs them into her nitrogen lances, making Accelerator's vector shield useless. Unfortunately for her, it doesn't mean much when Accelerator just dodges them entirely.
- Ax-Crazy: Oh yeah, big time.
- Blow You Away: Her power allows her to control nitrogen just like her fellow "classmate" Kinuhata. However, in contrast to Kinuhata's nitrogen shield, Umidori instead creates nitrogen lances from the palms of her hands which she then fire at her enemies.
- Break the Haughty: Misaka Worst torments her so hard she cries.
- Brick Joke: Touma invokes the possibility of her having cyborg cat ears underneath the raincoat she always wears. She denies this. Cue Misaka Worst barging in later on, saying she found "optional parts," specifically cat ears and cat paws gloves. Kuroyoru screeches when she hears this.
- Cat Girl: New Testament Volume 2 foreshadowed this heavily.Umidori: There isnt going to be some strange development where it turns out I always wear my hood in order to hide cat ears!!Later...Misaka Worst: Heeeyyyy!! Misaka attacked a few Freshmen strongholds and found some fun optional parts! Lets have some fun remodeling that cool narcissistic girl with these cat ears and cat paw gloves!!
- The inevitable happened in New Testament Volume 3: Misaka Worst has "adopted" her and calls her Kuronyan.
- Card-Carrying Villain: At any chance she gets, she insists that she's a villain that loves the darkness and destruction that's out to destroy the Graduates (Accelerator, ITEM, Hamazura to name a few).
- Couldn't Find a Pen: After she gets curb-stomped by Rensa and is barely able to talk, she writes in her own blood to tell Shiage about Rensa.
- Cry Cute: In New Testament Volume 3 when Misaka Worst takes her teasing a little too far:
- Curious Qualms of Conscience: While under the effects of Agitate Halation, she finds herself unable to abandon Fremea.
- Cyborg: She uses this to augment her power. Since "Bomber Lance" is fired from palms, she attaches hundreds of mini-arms to her back. She can also detach pieces of her body like her arms. Apparently the yearly surgeries to maintain this ain't worth it, according to her. And it doesn't help that Misaka Worst is an electromaster that can completely dominate her because of this.
- Dark Action Girl: Just look at her. Nothing is left to be said.
- Emotionless Girl: When she's not being AxCrazy or a Jerkass, she seems to be this. Shiage can't seem to understand why she and Misaka Worst were so bored when their lives (as well as the people) were in danger.
- Enfant Terrible: Merely 12, and she's indulges in death and destruction. Most likely due to adapting to Accelerator's thought patterns.
- Evil Counterpart: To Saiai.
- Evil Feels Good: She gives Accelerator a small speech about it too.
- Even Evil Has Standards: Invoked. In her own words, after being locked up in Touma's bathroom:Umidori: And even as a member of the darkness, confining a twelve-year-old kid in the bathroom and removing both her arms seems really fucking twisted to me!!
- Glass Cannon: Since her powers and strategy concentrate so much on offense, she has weak defense.
- Senpai Kohai: She was the kouhai of Saiai Kinuhata during the Dark May project — her as the rebellious punk.
- Meaningful Name: "Kuroyoru" can be roughly translated as "Black Night", and "Umidori" can be translated as "dolphin". Roughly, her name means "Dolphin of the Dark Night".
- Mood Whiplash: Gets this hard when she goes on a hurtful tirade and tries to kill Touma, only to have him casually dismiss her and start talking about cyborg cat ears!]]
- Multi-Armed and Dangerous: Her power allows her to project lances of compressed nitrogen from her palms. Because she only has two palms, normally she can only produce two lances. The solution to the problem...modify herself with cyborg arms to give herself lots of palms. Problem solved.
- My God, What Have I Done?: When fighting Rensa, Umidori thinks that Shiage is preparing to betray her and thus doesn't follow through on his plan. This results in him nearly getting killed when she didn't follow through. This, combined with the lack of blame causes her to have a bit of breakdown.
- Not So Different: Accelerator gets a little creeped out by the fact that she's a mirror image of his old self.
Misaka Worst: How about we join forces as the villain girl combo?
- Literally, as a product of the Dark May project, she has Accelerator's offensive cognitive patterns in her brain. Kuroyoru happily lets her psyche be affected by the old Accelerator's thought patterns — unlike Saiai, who more or less controls herself.
- Pay Evil unto Evil: The Dark May researchers performed inhuman and vicious experiments on her and her classmates in order to try and turn them into copies of Accelerator. So in return, she slaugther every last one of them and bankrupted the entire project.
- Precision F-Strike: Her first meeting with Accelerator.Umidori: There was something I wanted to ask you if I ever met you. I had actually completely forgotten about it, but I remembered it when I saw your face. So I guess Ill ask you now.Accelerator: ...Umidori: Do you really fucking think everyone in the world can just get along?
- Suspiciously Specific Denial: She does not have cyborg cat ears! STOP ASKING!
- Taking You with Me: Tries to kill Fremea in a last ditch effort. Thankfully, a certain someone stops her. It's Touma.
- There Is No Kill Like Overkill: Her cyborg arms allow her to spam her ability.
- Villain Ball: She thinks just like the reckless, prideful, and over-confident Accelerator from Volume 3. When she fights Accelerator, the simple fact that he sidesteps her attack — completely diverting from his original self who would've stood head-on, and thus what Kuroyoru thinks — ends up completely bewildering her, leading to her defeat.
- Yin-Yang Bomb: After listening to Leivinia Birdway's lesson about magic, she develops a technique where she channels AIM into her cyborg parts, then attempts to cast a simple spell. The AIM and mana react and trigger an explosion and mini-earthquake. Doing this damages her cyborg parts, but leaves the rest of her relatively intact.
An esper and a cyborg agent of Freshmen, he's known to have a large collection of at least ten Powered Suits. He is also proficient in handling them. Silvercross worked with Umidori in their plans to assassinate Accelerator and Shiage.
- The Collector: Has at ten Powered Suits, usually used in his Freshmen job.
A DA officer, he was responsible for leading an operation to capture Esther Rosenthal before she could make contact with friendles. He gets tangled up with Accelerator in the early parts of his story.
In the anime, his DA codename is Basset Hound.
- Asshole Victim: He gets taken out by Scavenger for getting involved with Accelerator when he's ordered not due to the loss of their prototype mech Coffin.
- Cool Guns: Like most DA operators, he uses a Heckler & Koch G36C.
- Dirty Cop: Being an Anti-Skill officer who is now with DA.
- Fantastic Racism: Has no problem spouting hatred for espers.
- Justice Will Prevail: Nishio has a... interesting view on it as part of being a Dirty Cop.Nishio: Guard dog? That fits perfectly. We are the hounds that bite into all evil within Academy City. All evil will be torn to shreds by DA's fangs.
- Karmic Death: He helped murdered a pyrokinetic girl and then used the Coffin containing her corpse as a weapon. Fittingly, he is executed for his failure by having his flesh psychokinetically melted off his bones!
- Know When to Fold 'Em: When Nishio realizes that his tactics aren't working against Accelerator, he calls for backup to cover his retreat. Of course, this comes despite earlier opportunities to retreat.
- You Have Outlived Your Usefulness: He's executed for his repeated failures, which includes losing a prototype Coffin mech by Hishigata after making contact with him.
A DA scientist, he's responsible for ensuring the upkeep of the group's mechs.
In the anime, his DA codename is Dachshund.
- For Science!: The reason why he has no qualms in using humans for his research.
- Justice Will Prevail: Shares this view with Nishio and the other members of DA.
- Know When to Fold 'Em: Hishigata's ready to be more truthful when the situation is really bad. Unlike Nishio.
- Oral Fixation: Always seen with a sucker in his mouth.
- Screw This, I'm Outta Here!: After the Scavengers begin to take out DA operators, he decides that it may be time to leave the group with Hirumi.
- Taking the Bullet: Allowed himself to get stabbed by Esther before she can take out the Taowu on Hirumi's corpse.
- Verbal Tic: Yeah.
- Would Hit a Girl: Or precisely, he doesn't have problems using Last Order for DA.
A woman working with Hishigata aiming to acquire the "perfect mind and body".
- Batman Gambit: Further emphasized on the anime when it turns out she killed herself and stole Esther's Taowu charm to help with the experiment. Isaac hijacked her body subsequently and forced her to cooperate or she'll kill more civilians.
- Big Bad: Of the Necromancy arc. Or rather, the spirit possessing her corpse is.
- Dead All Along: She been dead since before the start of the Necromancer Arc. The Hirumi currently moving around is actually her reanimated corpse.
- Ill Girl: She is often shown on life support. The machines are likely preserving her body from rotting as she is essentially a zombie at this point and also to upload data into her to power her up.
- Nice Girl: In life, she was this. Her death and subsequent revival gave her personality a 180 flip.
- Screw This, I'm Outta Here!: She leaves DA with Hishigata when the Scavengers begin taking them out.
- Walking Spoiler: Talking about her in any way would spoil things such as the fact that she's dead by the time the Accelerator manga started and the person we see is actually her possessed corpse.
A Dark Side team who specialize in Clean Up Crew jobs for the city's Board of Directors.
- Berserk Button: All of them except Seike utterly despise teachers.
- Creepy Child: They don't appear to be older than their early teens at most! Yet, they're all remorseless killers who do their jobs with brutal efficiency.
- Dark and Troubled Past: Their hatred of teachers, honor students, and being teenage killers in general, heavily implies this about the four of them.
- Fun with Acronyms: Averted and lampshaded by Naru, who wonders that if they successfully pull off the Doppelganger job in Railgun, part of their reward will be the opportunity to get a name like ITEM.
- Getaway Driver: Like most things they do, getaways are a collaberative effort for Scavenger. Naru provides the actual vehicles with her powers, Seike presumably uses her powers to make their vehicles faster by reducing friction, and Yakumaru provides the propellant.
- Human Popsicle: The four apparently sleep or is place in stasis inside cryogenic pods inbetween missions.
- Informed Attribute: They are noted to be a feared organization on the Dark Side and quite competent at their work. Unfortunately, we only get to see them dispose of mooks before getting their asses handed to them by the sheer luck of running into opponents far beyond their leagues, i.e. Accelerator, Misaka, and the Doppelganger.
- Villainous Friendship: Unlike most Dark Side groups who are held together by Teeth-Clenched Teamwork or filled with members who would kill their own if pushed, these four have genuine bonds with each other.
- Well-Intentioned Extremist: The group believes their targets are scum that corrupt the city, and that they're making the world a better place by killing them.
- You Have Outlived Your Usefulness: By the time of their appearance in Railgun, their utter failure against Accelerator in his spinoff manga has put them on thin ice with the Board of Directors, with it being noted that if they screw up the Doppelganger job, their group could be disbanded and themselves suffering "accidents". It's the reason why Leader is so insistent on getting signed off for the job.
The leader of Scavenger, often seen wearing a flu mask. Her Level 3 esper power, Predator, allows her to locate her target by projecting multiple imaginary eyes in the sky. It works better during the night.
- Achilles' Heel: Her ability needs her cover one of her eyes to activate and it's weaker during the day.
- Because You Were Nice to Me: Because Mikoto shows concern and kindness to her while she was pretending to be a Judgement member, she decides to aid Mikoto after Scavenger gets signed off for their job by saving Ryoko's life and helping Mikoto in her final battle against the Doppelganger.
- Big Bad Wannabe: Her ultimate goal is to take down the principal of Academy City (Aleister Crowley) but her team is small fry compared to other Dark Side organizations like BLOCK, who share a similar goal.
- Bring My Brown Pants: Accelerator scares her so much that she wets herself before losing consciousness. In Railgun, she wets herself again (a little) from stress when attempting to convince Mikoto she and Scavenger are actually associated with Judgement.
- Bullying a Dragon: She realizes too late that the white-haired boy that they are fighting is actually the strongest Level 5 esper.
- Child Hater: Inverted. She's a child who hates teachers.
- Crazy-Prepared: She carries a fake Judgment armband on her person in order to better sell her lie about being a Judgment officer.
- Everyone Calls Him "Barkeep": Her teammates call her Leader. Her full name is eventually revealed in a magazine.
- Exact Words: She managed to get the cyborg research lab to sign off on their mission's completion through this and a bit of force by her teammates.
- Fiery Redhead: Subverted. She's normally one of the calmer and least likely to jump into a fight of all of Scavenger thanks to being a Support Party Member, and when she gets emotional it's because she's panicking out of her mind.
- Freudian Excuse: Her reason for hating teachers and honor students/teacher's pets was because she was abused by one in the past and instead of helping her, her classmates all mocked her.
- Hypocritical Humor: Like most people in Academy City, Leader doesn't follow horoscopes but she does know a little about Urban Legends, namely about a certain Level 0 having the misfortune of meeting more than half of the Level 5 Espers.
- Impersonating an Officer: Played with, in that Judgement is technically a volunteer-staffed disciplinary committee assigned to aid Anti-Skill, but she still plays up herself and Scavenger as being Judgement members (with Seike being a civilian contracted for difficult missions) to Mikoto.
- Irony: She known for hating all teachers to the point of wanting to wipe them out. Without her mask however, she strongly resembles Komoe Tsukuyomi, who's one of the kindest and most caring teachers in the series.
- Malevolent Masked Woman: Is almost always seen wearing a white flu mask with two crossed purple hands over it, and is the leader of a Dark Side group. Downplayed in that she's more of an Anti-Hero just doing her job than truly malicious.
- Oh, Crap!: Her reaction to encountering Accelerator and Mikoto.
- Only Six Faces: The out-of-universe reason for her always wearing her mask seems to be because she has a very uncanny resemblance to Komoe Tsukuyomi, just with red hair and eyes rather than Komoe's pink.
- Seer: Her ability, Predator, grants her a bird's eye view across a vast radius and is seemingly adjustable as she could focus her vision on her targets to make out specific details of their current location and actions. The only downside is that she needs to cover one of her eyes before she can activate it and it's less effective during the day.
- The Smart Girl: She's Scavenger's main strategist and brainpower, and she was able to spin a decent narrative about Scavenger being Judgement members to a disbelieving Mikoto and covering for any point it looks like the lie is about to come undone. She was also able to accurately track the falling Kuriba Ryouko when the latter tried to kill herself to apprease her doppelganger, noting the minute changes in her trajectory as she guide Seike and Naru toward Ryouko's ccordinates during their Villainous Rescue.
- Support Party Member: She serves as the brains and spotter of her group but has little role in combat.
- Tempting Fate: In Railgun, she believes that their previous encounter with Accelerator was just a coincidence and that it would be unlikely they will ever meet another Level 5 esper again. Scavenger's next assignment has them meeting Mikoto and by proxy, Misaki, the third and fifth-ranked Level 5 respectively.
- Underestimating Badassery: After a relatively quick skirmish with the Doppelganger that resulted in an apparently easy capture, she sends Seike after Ryoko Kuriba and mocks the Doppelganger a bit, only to be utterly blindsided when the Doppelganger reveals Naru's paper restraints don't actually work on her and proceeds to break Leader's arm and thrash the rest of Scavenger.
- Villainous Breakdown: Upon learning that they just picked a fight with Accelerator, Leader loses her usual calmness and freeze in place, unable to come up with any strategy against the strongest Esper.
One of the most normal-looking members of Scavenger, she is nonetheless a remorseless killer. Her esper power, Stick Slip, gives her control over friction. In Railgun, it is suggested that Seike may be a boy wearing a girl's uniform and his/her true gender is unknown.
- Ambiguous Gender: When she is confronted by Mikoto, whom she had mistaken for a boy due to her disguise, Seike claims that she and Mikoto carry the "same package", implying that Seike is actually a male. The cover page for the next chapter even states that her hobby is crossdressing and her true gender is unknown. It's also emphasized when Naru decides to strip Seike in order to determine what color would suit her hypothetical toku uniform and while the clothes do indeed go flying off, Seike isn't shown fully on-screen, she's covering her front and crotch in the aftermath, and Naru doesn't act like she saw anything "unusual" after the stripping, only commenting that Seike would be "more Blue than Black."
- Ambiguously Evil: The cover page for Railgun Chapter 90 states that Seike doesn't share the same hatred for teachers like her teammates and pretends to agree with their views to not disturb the team's harmony.
- Blood Knight: While less excitable than Naru, Seike definitely likes fighting people and doesn't need much incentive to pick a fight. Leader is forced to spin Seike as a civilian contracted to Judgement for special cases that has a bad habit of picking fights to get her Judgement membership lie past Mikoto.
- Bokukko: She sometimes uses male pronouns to refer herself during conversations. This might be the a hint that she is actually a boy.
- Bullying a Dragon: After her unfortunate encounter with Accelerator, she finds out too late that she decided to pick a fight with Mikoto in Railgun.
- Butt-Monkey: Has the reputation of becoming the first member of Scavenger to be defeated by Accelerator and Mikoto in their respective series. And then there's the part where she gets stripped and fondled by Naru.
- Clean Up Crew: Scavenger is usually employed by the Board of Directors to swoop in after battles and terminate stragglers and witnesses.
- Cool Down: She has a limit of 3 minutes per continuous power usage, so she needs to rest in between uses.
- Does Not Like Shoes: Combine with her powers, Seike is able to run faster when she is barefooted.
- Foreshadowing: When Scavenger first appear in Railgun, Seike is the only person who isn't in the washroom with her team mates. Though it is initially assumed that she doesn't need to use it, it is more likely is because that she cannot enter because she is a boy.
- Harmless Electrocution: Subverted. Seike is electrocuted not once, but twice in her encounters with both Accelerator and Misaka. Misaka simply blasted her with enough power to knock her out, while Accelerator, being, well, Accelerator, turned her own body's bioelectricity against her, essentially making her electrocute herself. The screaming makes it clear the experience was agony.
- Hour of Power: Can only use her powers for 3 minutes in a row.
- Kick the Dog: Roughs up Ryoko Kuriba in order to see her bleed and make sure she wasn't the Doppelganger per orders, and then muses to herself on whether or not she should let her go or finish her off. Then she picks a fight with Mikoto for no other reason than overconfidence.
- Logical Weakness:
- Because she can control friction, she can use it defensively by making physical projectiles burn up before hitting her by turning the friction up...but she can't do anything about energy-based attacks like lightning, forcing her to rely on other weaknesses like creating grounding from metal wreckage to compensate.
- Also, while she can reduce or increase friction at will, she can't do both at the same time. This gets her into trouble with Naru when she uses her ability to reduce friction so her paper can't touch her, but when she needs to escape the room upon realizing Naru intends to run the Cool Down off she has to lower her ability in order to properly grab onto the door handle, which lets Naru catch her anyways.
- Maniac Tongue: Tends to stick her tattooed tongue out, usually to identify her team to their would-be targets.
- Neck Snap: She can break a full grown man's neck with her bare hands.
- Person of Mass Destruction: She can make an entire construction project fall apart just by casually walking pass it while her power is active.
- Recoil Boost: After reducing the friction between her feet and the ground, she can fire a gun in one direction so that she will slide in the opposite direction really fast. She comments that she doesn't like doing it often because it hurts and is dangerous.
- Sailor Fuku: Her outfit.
- Super Power Lottery: She has control over all friction within a 1 meter radius of her. By reducing friction, she can make things slide out of control. By increasing friction, movement is restricted. A 120 ton mecha couldn't move and projectiles like bullets burn up in the air before they can reach her, rendering her practically invulnerable to most forms of direct attack...for three minutes, at least.
- Tattooed Crook: Has a skull with horns and chains on her tongue.
- This Is Gonna Suck: She has this realize when she finally realizes who Mikoto is and she's about to get flattened.
- Well-Intentioned Extremist: Downplayed. Her Railgun bio states that she doesn't share the view that teachers are evil, but goes with the flow so as to avoid causing friction within the group.
A childish, but no less ruthless, member of Scavenger. Her Level 3 Psychokinesis, Perfect Paper, as the name suggests, gives her control over paper.
- Animal Motifs: Bunnies, as in the Killer Rabbit kind.
- Beware the Silly Ones: Despite being the ditz of her group, she serves as Scavenger's main fighter and her teammates state her combat skills makes her equivalent to a Level 4 esper. She also gets pissed when the Doppelganger hurts Leader and threatens to kill Yakumaru, with her going on the warpath with the full intent to break her to pieces. Which of course was the Doppelganger's goal. She's also smart enough to take full advantage of her teammate's abilities, like when she intentionally forces Seike to continuously use her powers so that she can strip her without issue.
- Clean Up Crew: Scavenger is usually employed by the Board of Directors to swoop in after battles and terminate stragglers and witnesses.
- Cloudcuckoolander: Lets just say she is not the sharpest tool in the shed when it comes to intelligence.
- Dark Action Girl: She is skilled at close quarters combat and can easily take out full grown thugs.
- Expy: A dark flip of Anita.
- Hidden Depths: Likes visiting art museums, particularly enjoying three-dimensional exhibits.
- Impaled with Extreme Prejudice: Both on the delivering and receiving end of this.
- Killer Rabbit: Her battle armor takes the form of one.
- Mind over Matter: Naru is a psychokinetic that uses paper as a medium.
- Oh, Crap!: Freaks out when the Doppelganger assimilates her paper and uses it against her and Scavenger.
- Paper Master: She can use Psychokinesis to turn paper into bombs, cushions, and fully functioning complex weapons (like drills). All of her clothing is made of paper. She can make it as soft as silk or stronger than steel. Even when the Doppelganger assimilates her paper, she able to restrain her through sheer force of will, though not actually attack her.
- Shameless Fanservice Girl: She doesn't care about being exposed, and seems confused about why other people would have issues suddenly stripping naked.
- Tattooed Crook: Has a skull under her left eye.
Nicknamed Ya-kun, a Scavenger member slightly more serious than Naru, but also a hardened killer. Her esper power, Mix Master, allows her to separate liquids by manipulating their specific gravity. She then mixes up these liquids and other chemicals to produce various effects.
- Beautiful All Along: Her usual manner of dress makes her look very boyish. However, during the fight with the Doppelganger she loses her cap and hair clip, resulting in Letting Her Hair Down, and gives up her shirt to the now-naked Naru, revealing she wears a black sports bra underneath combined with her black shorts, and suddenly it makes a lot of sense about why she usually dresses how she does to avoid getting hit on and scouted as a model.
- Chemistry Can Do Anything: Yakumaru's utility belt holds many different chemicals. When use in conjuction with her powers, she can create various mixtures which include restraining foam, freezing gas, liquid thermite, explosives and healing spray.
- Clothing Damage: She loses her cap and hair clip while fighting the Doppelganger in Railgun, which lets her hair loose.
- Compressed Hair: Her cap and the way she ties up her hair hides the fact she actually has some pretty long hair.
- Kill It with Ice: She has a special coolant that she can spray on her targets that can freeze and kill a person almost instantly. She makes it herself.
- Literally Shattered Lives: Made possible by the above and the sheer force of Naru's attacks.
- Master Actor: All it takes for her to fool the Skill-Out thugs (and Naru) is some dirt on her clothes and person and putting on an adorable yet vulnerable face and sob story
- Nice Hat: She wears a newsboy cap, apparently to ward off attention and avoid being constantly hit on and scouted as a model.
- Stuff Blowing Up: She carries at least a few explosives on her person in the event her chemicals aren't enough.
Known Members: Nancy, Vera, Orson, Rod, Caines, Dennis, Mike, Olaf, and LuluA Black Ops unit headed by Amata Kirihara. After Amatas death, their remnants are reorganized under the girl in a red dress.For tropes relating to Amata Kirihara, see here.
- Bullying a Dragon: They take on Accelerator. Appropriately enough, he kills almost every one he encounters.
- Cruel and Unusual Death: Nancy is killed horrifically by Accelerator. First, he shoots her in the side with a shotgun. Then, when shes on the ground, he blasts off her jaw. Not finished with her yet, he kicks her off the ledge and crushes her under a hydraulic press. This is slightly changed in the anime so shes dead after he blows her face off
- Do Not Taunt Cthulhu: One member almost escapes the slaughter at the Third Resource Recycling Processing Facility, but pauses to taunt Accelerator, claiming Last Order is doomed. All thats shown after Accelerators through with him is a bloody smear.
- Famous Last Words:Nancy: Y-youre joking, right?
- Killed Offscreen: Vera, Rod, Caines, Dennis, and Mike.
- Known Only by Their Nickname: Excluding their leaders, all members are known only by their codenames.
- Stress Vomit: Vera throws up when she finds Nancys blood and brain matter on the button to the hydraulic press.
Head ChefThe leader of team Full Course and the Head-Chef of the Escoffier's kitchen. An esper with the ability, Material Insect, which allows him to control metals, typically in the form of wires.
- Bad Boss: He tries to slice open Tao's head and serve his brain because he didn't properly explain his thoughts to him.
- Extra Oredinary: His ability, Material Insect, allows him to control metals, such as the wires he keeps on his person and shapes them into animal constructs.
TaoThe sous-chef and The Dragon to the Head Chef of Full Course. He's an esper with the ability called Aqua Navigator, which allows him to control the flow of liquids.
- Ambiguous Disorder: He tends to be scattered brain, will act without considering the consequences of his actions, and frequently thinks outlook. When Accelerator told him he was a guest for the party on the Escoffier, Tao seemingly took his words at face values despite the obvious evidence to the contrary.
- Ambiguously Gay: He constantly fawn over the Head Chef and does everything he ask with absolute joy.
- Making a Splash: His ability Aqua Navigator allows him to essentially control water and shape them into constructs, typically eastern dragons, to attack with. He can also coat his body with a thin layer of water to act as a buffer against attacks and surround himself and at least one other person in a torrent of water as a mode of high speed transportation.
- Not So Stoic: He visibly and audibly panics when the Head Chef threatens to extract his nectar.
- Pet the Dog: He has at least enough awareness to tell Mami to hold her breathe before he surround them both with a torrent of water in order to escape Accelerator.
- The Stoic: He barely emotes, especially when lost in his work. As the event of the Nectar Arc wears on, he begins to show more and more erratic and extreme emotions as the whole situation collapses around Full Course.
Mami TobioYumi Tobios long-lost twin sister and newly recruited member of Full Course. Her share the same esper ability as her sister, Eruption Sphere, which allows her to gather and compress air currents into spheres in the palm of her hands.
- Eye Scream: Her left eye is a black pit. When the Head Chef is extracting her nectar, there are worms squirming in the empty socket.
- Ill Girl: As a little girl, she developed a rare disease.
- Meaningful Name: Her title in Full Course's kitchen is Aperitif, which is a type of drink served before a meal in order to stimulate a person's appetite. This makes sense as she's a source of Nectar/Liquid Body Crystal.
Baggage City Assault
One of the three Kiharas sent to attack Baggage City.
- Badass Transplant: She has Equ.DarkMatter implants, made using Kakine Teitoku's ability, that allow her to use powers despite not being an esper.
- Evil Cripple: A wheelchair-bound woman who is just as immoral as a Kihara can get.
- Evil Is Not a Toy: Since Kakine's consciousness inhabits every part of his Dark Matter, he threatens to take her over and she has to keep them sealed up and rely on an authorization code held by Enshuu for safekeeping to avoid losing herself.
- Healing Factor: She can easily heal from nearly any injury.
- Off with Her Head!: Kagan Kihara slashes her head with his sword, then rips it off with his bare hands.
- Meaningful Name: Her given name means "Pathology".
- Super Wheelchair: It is armed to the teeth with weapons, and can transform into a spider-like mecha.
- Voluntary Shapeshifting: She can change into several forms based on cryptids like: the Skyfish, the Yeti, one of The Greys, and the Loch Ness Monster.
- Wounded Gazelle Gambit: Often pretends to be a kind, helpless woman to make people drop their guard.
One of the three Kiharas sent to attack Baggage City. He uses various chemicals, developed from the Mental Out Five OVER project, to produce illusions.
- Honor Before Reason: Part of it is sadism, but he prefers to toy with an opponent with his illusions before killing them, because killing someone right away is too boring.
- Master of Illusion: His skill with creating illusions with chemicals is roughly equal with Útgarða-Loki's skill with creating illusions with magic.
- Meaningful Name: His given name means "Random Number".
- Morton's Fork: Gives one to one of the Science Guardian leaders for his own amusement. The man's wife, daughter, son-in-law, and two grandsons were rigged with guns. The man had to pick one to be shot, and Ransuu claimed only one gun was loaded, when in reality they all were. The man picked his son-in-law, but fortunately, his entire family was rescued from under Ransuu's nose.
- Sealed Evil in a Duel: He and Útgarða-Loki manage to catch each other in their illusions, forcing a stalemate.
One of the three Kiharas sent to attack Baggage City. She is capable of mimicking other peoples' thought patterns.
- Awesomeness by Analysis: In her captivity, she learned advanced science by observing everything in her room.
- Book Dumb: She doesn't know basic math or how to write katatana because she has never been taught these things. She is still a super genius.
- Combat Pragmatist: Uses numerous gadgets and improvised weapons, including toxic mold.
- Fashionable Asymmetry: Her boots don't match. Also, her stockings are torn up randomly.
- In the Blood: When she was very young, some rivals of the Kihara family kidnapped her and kept her in isolation. Despite no basic education, she still became a scientific genius with no regard for the victims of scientific research. She eventually escaped and rejoined her family.
- Little Miss Badass: This middle schooler had the highest body count during the Baggage City assault.
- Meaningful Name: Her given name means "Circumference".
- Power Copying: She doesn't actually gain their powers, and she can only use them one at a time, but by mimicking other people's thought patterns, she gains access to their skills. She has access to over 5,000 people's thought patterns.
A Kihara sent to negotiate with the leaders of the Science Guardians after the events in Baggage City.
- All Your Powers Combined: When she finally steps up as a major villain, she doesn't pull any punches. She uses Ayu's FIVE_OVER Outsider, allowing her to disguise herself as someone else. She infects herself with an attenuated strain of the St Germain virus, allowing her to use magic (especially magic that creates animalistic constructs). She also infects herself with modified Sample Shoggoth, giving herself a potent Healing Factor. Sample Shoggoth allows her to sever Kakeru's right hand and connect it to her own arm, while the St Germain virus lets her rewrite her own brain to fool World Rejector into accepting her as its user. Finally, in NT Volume 16 she creates her own version of the Anti-Art Attachment.
- Ambition Is Evil: Alongside revenge for Noukan's near-death, she also swears to surpass him to honor his final wishes.
- Arc Villain: For the 15th to 17th New Testament novels, where she seeks to avenge Noukan, who was beaten to near-death by Kamisato.
- Ascended Extra: Introduced in a rather minor role during New Testament, quickly rises in prominence as The Man Behind the Man of Hisako Yakumi and finally becomes an Arc Villain.
- Batman Gambit: Part of her plan to defeat Kakeru involves forcing him to use World Rejector's power to save his comrades while he himself holds conflicting desires, thus banishing him as well. Then, by reclaiming and grafting World Rejector to herself, she forces the Kamisato Faction to follow her as she wields seemingly the only way to save him.
- Even Evil Has Loved Ones: She really does care about Noukan Kihara beyond their master-student relationship and his near-death at the hands of Kamisato is what triggers her Roaring Rampage of Revenge against him.
- Fan Disservice: At one point, she's running around wearing nothing but her lab coat and a bikini, which shows her body's pretty easy on the eyes. It can get a little hard to fully enjoy it with how at one point during this time she's wielding a "biological" version of the Anti-Art Attachment that makes vein-like growths appear all over her body. Plus, there's the fact "her" right hand is actually Kakeru's World Rejector and right hand stitched on in her original's place.
- For Science!: She released Kakine into Academy City following his revival, not caring that he would cause untold destruction, because she was curious and wanted to observe what he would do.
- Meaningful Name: Her given name can mean "Single", "Sole", "Only", or "Unique".
- Mr. Exposition: Reveals the truth about the Kiharas to one of the Science Guardian leaders: without Academy City to keep them in check, the Kiharas would likely spread across and destroy the world.
- Uncertain Doom: The last we see of her is her surrounded by the girls of the Kamisato Faction who had just learned that Kakeru was saved by Touma and they no longer had any reason to follow her. Whether or not they kill her is left unknown and in the Afterword Kamachi even says he hopes fans will debate her fate.
A mercenary hired by Thomas Platinaburg in order to dispose of Accelerator. A close friend of Sunazara Chimitsu, which doesn't bode well for Platinaburg when he tries to use him as a bargaining chip for her cooperation.
- Awesomeness by Analysis: Her time in Anti-Skill training allows her to analyze esper powers and their workings.
- Badass Normal: Takes on Kinuhata Saiai without using any powers. Being a former Anti-Skill trainee, she knows how to suppress espers without using lethal force.
- Boxed Crook: She is eventually released from prison in exchange for helping Anti-Skill.
- "Could Have Avoided This!" Plot: She herself states that if Platinaburg hadn't tried to force her cooperation with threatening Sunazara's life, she would have been happy to be his pawn and wouldn't have killed him.
- Friendly Sniper: In contrast to Sunazara, who says that her tactics are an outrage to assassins.
- Gatling Good: She is skilled enough to incapacitate someone with a gatling gun without killing them. This is when her preferred bullets are powerful enough to turn an armored vehicle into scrap metal in seconds and pierce Saiai's nitrogen bubble with a few rounds.
- Kick the Son of a Bitch: Kills Thomas Platinaburg after she finds out that he was tampering with Sunazara's body with machines in order to force Stephanie to cooperate.
- Ms. Fanservice: She's pretty good-looking, and it's commented upon In-Universe that she has the looks of an actress or model. It's also pointed out by Sunazara that her looks can be a bit of a hassle in her occupation as an assassin, as they make her stand out when she needs to be hidden.
- Revenge: Platinburg originally assumes she wants revenge on ITEM (and Saiai in particular) for their role in putting Sunazara in the hospital. As she tells him right before she kills him, what she actually wants is revenge on Academy City itself for what happened to Sunazara, starting with the man who put a transmitter meant to kill Sunazara inside him if she refused to cooperate (i.e. Platinaburg himself).
- Technical Pacifist: Her fighting style is designed so that she can apply only the necessary amount of force without being lethal.
- There Is No Kill Like Overkill: She originally thought it was best to use a missile launcher than a sniper rifle to assassinate. Proven otherwise because such overkill make harder to prove the death.
- Well-Intentioned Extremist: She only became a mercenary in order to protect the peace that she used to live in.
An assassin and bodyguard working for Shiokishi. Sugitani is also a ninja descendant of the Kouga.
- Awesomeness by Analysis: Managed to partially reproduce Amata Kihara's technique to bypass Accelerator's passive vector redirection by observing it. He still hurt his hand when punching Accelerator so it wasn't complete, but Accelerator notes even that is a sign of Sugitani's top skills.
- Badass Normal: Takes on a Level 4 and a Level 5 esper armed only with hidden weapons and martial art skills. He's also pretty good with a pistol, accurately taking down the Spark Signal terrorists by shooting each of them once, either in the head or in the center of the abdomen, killing them all instantly.
- Badass in a Nice Suit: Wears a black suit, black gloves, and a red tie, much like his inspiration does.
- Combat Pragmatist: When faced with Awaki Musujime and Accelerator he uses a hidden weapon to immediately take down Musujime, who can bypass all physical defenses of Shiokishi's base with her Teleport power. After realizing his copy of Amata Kihara's technique is imperfect he decides to take down Accelerator by simply shutting down his collar and thus his access to the Misaka Network.
- Expy: The artist' notes indicate that Sugitani's design was based on Agent 47.
- Highly Visible Ninja: Averted, Sugitani dresses more like a professional hitman. The only reason we even know he's a ninja is that he reveals himself as one to Accelerator.
- This Banana is Armed: Sugitani carries several lighters that can shoot one small anesthetic bullet using high-pressure gas as a sneak attack while pretending to light a cigarette. What's more, he can release the gas of several lighters thrown at the enemy and use a lit cigarette to cause an explosion.
- Uncertain Doom: Sugitani is shot multiple times by Accelerator, but the narration notes that, though unconscious, he is still breathing heavily, implying Accelerator has spared his life.
- Well-Intentioned Extremist: Sugitani views himself as 'Good' because all the contemptible things he does are for the sake of justice, aiming to bring order to Academy City by eliminating 'Evil'. After defeating him Accelerator refutes this, stating there's no difference between them, both use the same methods so Sugitani is also an 'exceptional villain'.Sugitani: "This is my 'Good'. This is the method of a man who lives in a world of despicable people yet still follows justice."
A new Cyborg developed by Academy City to match up with the Level 5 Espers; serves Yakumi Hisako.
- Ax-Crazy: Number 29.
- All Your Powers Combined: Can replicate the 1st through 6th level 5 esper powers and also any other esper within 200 meters. She can only use one power at a time.
- Brain in a Jar: More specifically a hypothalamus in a jar, the one part of a human body that cannot yet be replicated by Academy City. After her body is destroyed, Touma salvages 40 of the brains and puts them in cold storage until something can be done about them.
- Confusion Fu: Her facial expression doesn't change, she barely has any body language, and her involuntary muscle movements like blinking and breathing are completely regular. This makes it very difficult to predict her in battle. Ultimately, she can't keep it up forever, especially if she gets upset.
- Dark and Troubled Past: Invoked by Number 29 to explain why she chose to become a cyborg. She assumes Number 28 had a similar experience.
- Dramatic Irony: In her speech to Touma, she seems to regard him as a complete greenhorn at heroism and unaware of the dark side, claiming that he never been in a situation where he couldn't save everyone before, and noting that he still has all his limbs and organs intact. This to a man who has saved the world several times, battled the dark side of Academy City and the magic factions, and lost his right arm four times.
- Emotionless Girl: Number 28.
- Expy: Artist notes indicate that Number 29's design is based on Envy from Fullmetal Alchemist.
- Feel No Pain: As a cyborg, she can shut off her pain receptors.
- Frame-Up: Part of her plan involves murdering Fremea and pinning the act on Umidori. Fortunately, she is foiled.
- Heroic Sacrifice: Dies in order to protect Hisako Yakumi.
- Hospital Hottie: Number 28 has a day job as a nurse.
- The Nicknamer: Number 28 tends to call people by descriptions instead of their names, like "Fatty", "Wrinkly", or "Mr. Psychedelic".
- Pretender Diss: As Touma notes during his fight with her, while she might have the powers of the Level 5s, she's no Level 5 herself and can't use their powers as effectively.
- Power Copying: Can copy the power of any esper in a 200 meter radius. However, she couldn't copy Gunha Sogiita's powers because his powers are not understood by anyone. She cannot use a power as well as the original, especially if it requires vast computational powers like the Level 5s' powers. If an esper dies, she cannot copy his or her power anymore. When she tries to copy Imagine Breaker, it blows up her arm.
- Power Gives You Wings: During the final battle Touma and Beetle 05/Kakine, Rensa defaults to using Accelerator's power set, attempting to take advantage of the fact Accelerator sprouts black wings for a power-up when in a desperate situation. She succeeds in doing so, and at the end of the fight even manages to manifest the white wings in a final effort to defeat Touma.
- Sexy Backless Outfit: Has one in her nurse uniform, which is meant to let the AIM receptor (which looks like a giant flower) that allows her to perform her Power Copying unfold out of her back without tearing her clothes.
- Transformation Is a Free Action: Averted, she as a .7 second delay between powers. Of course, making use of it is hard.
- Underestimating Badassery: She had never heard of Touma before, so she dismisses him as some street punk, only to be shocked when he battles her with ease thanks to Imagine Breaker.
- Undying Loyalty: To Yakumi, to the point of willing to try and die for her. Sadly, Yakumi doesn't reciprocate such loyalty.
- You Are Number 6: Rensa is actually a single body with multiple different brains that can be uploaded into her. Each brain is referred to as a number.
A Level 3 with the ability Mental Stinger, which gives her mental powers similar to Misaki Shokuhou.
- Always Second Best: Part of her resentment for Misaki is that Ayu feels she simply an inferior version of Misaki and that people will always compare her to Misaki, seeing her as nothing more than a cheap knockoff of Mental Out. what she doesn't know is that she and Misaki actually possesses near-identical potentials, Ayu's simply not as powerful as Misaki due to the fact that the researchers were sabotaging her development in order to keep her at a certain level, in case they ever needed a replacement for Misaki.
- On a meta example, this also applies to her character design. Her appearance is an early rejected concept art of Misaki. The fact that it was pushed aside for the Misaki's final design and being reused for Ayu's appearance in NT 11 coincidentally adds to her contrast with Misaki.
- Animal Motifs: Her last name means "honeypot ant". She describes herself as an ant that wants to be a bee (Misaki's Animal Motif), and her Five Over OS (Outsider) - Modelcase Mental Out device looks like a bloated honeypot ant.
- Arc Villain: Serves as this in the 11th New Testament novel, going against Misaki. She was also revealed to be the second villain involved in the Astral Buddy manga, which takes place during Railgun's Dream Ranker arc.
- Beauty Mark: Much to her embarrassment, she has one around her crotch area in the Biohacker side-story.
- Bungled Suicide: After being passed over in favor of Misaki and failing to contact Touma, she tried to kill herself, but failed. She then devoted her life to getting revenge on Misaki.
- Clingy Jealous Girl: In the Biohacker side-story, she gets jealous whenever Kumokawa gets close to Touma.
- Combat Pragmatist: Since her powers are not as strong as Misaki's, she utilizes several devices to even the score. She even pretends to be affected by Misaki's powers, then attacks her when she drops her guard.
- Cool Big Sis: She played this role to the Yumiya sisters during her time in the Ideal laboratory, which was part of the Clone Dolly project.
- Doomed by Canon: As seen in the Biohacker side-story, Ayu eventually tries to drown herself after Touma failed to answer her calls at the end, leading to the events of NT 11.
- A Day in the Limelight: The Biohacker side-story included in the Accelerator DVDs explains how she and Seria Kumokawa first met Touma when she was targeted by the Dark Side of Academy City. It also reveals how her self-worth was shattered by the arc villain, with the side-story ending on her suicide attempt.
- Don't Look at Me!: Despite her failed suicide, she never saw Touma from then on to let him know that she was alive because she didn't want him to see her covered in the "filth of pitch-black hatred".
- Driven by Envy: Ayu's entire character motivation is driven by her inferiority complex towards Misaki and Ayu's perception is that Misaki twisted her entire life despite the two of them never meeting. Among the things that Ayu perceived is that Misaki stole her position as a Level 5 Esper and her relationship with Touma.
- Evil Plan: She was responsible for the distribution of Indian Poker cards that held Ideal lab technologies, which linked their users to Senya's AIM ghost form in order to create another composite power storm.
- Evil Counterpart: In the past, she and Misaki were roughly equal in power and potential. However, the higher-ups of Academy City decided to devote more resources to Misaki's development and essentially kicked her to the curb. Full with despair, she decided to commit suicide. Just before doing it, she tried to contact Touma but he never came to save her because he had lost his cellphone in his first meeting with Misaki. This made her completely lose hope and try to drown herself. After the failed suicide attempt she discovered why Touma hadn't come, filling her with hatred towards Misaki, who not only had received better treatment, unknowingly and indirectly made Touma unable to help her but also was saved by Touma.
- Fat Suit: When she wears the artificial fat Five Over OS (Outsider) - Modelcase Mental Out as a suit, it forms a body that weighs around 300kg and makes her look like an enormous Misaki.
- I Just Want to Be You: Her ultimate plan was to drain Misaki's memories into herself, leaving her a vegetable, so that she could have her happy life and past friendship with Touma. When Misaki manages to resist, she aborts the plan and just tries to kill her.
- Impaled with Extreme Prejudice: In a sense. If the name of her ability didn't tip you off, her mental intrusion apparently feels like wires shooting into your brain as described by Misaki.
- Ironic Name: Ayu means "love" and "joy", which does not describe her at all. At least, not her current self. During her time at Ideal, her name was Played Straight as she was a complete Nice Girl.
- The Lost Lenore: She's the first girl who Touma grew close to and failed to save prior to his meeting with Misaki. According to Seria, this left him with strong regret that he could never get over. Subverted since she was still alive due to her suicide failing, but never saw Touma afterward because she wanted him to remember her fondly as the girl he was once close to and to not see her as the "utterly-changed ruins of that person".
- Magic Feather: Similar to how Misaki focuses her powers using remotes, she focuses her powers by pointing cameras or her fingers at her target.
- Mind Manipulation: Mental Stinger works by manipulating moisture, controlling the distribution of fluids, and the secretion of chemicals in the target's brain.
- Murder the Hypotenuse: While Ayu originally planned to steal Misaki's memories and leave her a vegetable, upon hearing Misaki's proclamation that Touma will save her despite losing his memories, Ayu attempts to murder Misaki in a blind rage, abandoning her original plan.
- The Resenter: Hates Misaki for becoming the #5 Level 5 instead of her and for being saved by Touma instead of her.
- Sinister Surveillance: She's been monitoring Touma and Misaki for a long while before the start of the setting in Volume 1.
- Villainous Breakdown: When she is about to kill Misaki and gloats that there is no hope for her, Touma arrives to save the day. Ayu goes crazy, complaining that it is not fair that he'd save Misaki even though he never received any message from her and it is practically impossible for him to learn about her murder attempt while he didn't save Ayu back then due to a similar lack of information.
- She has another one when her plans in the Astral Buddy arc begins to crumble around her.
- Walking Wasteland: During bouts of extreme emotion, she can cause the area around her to suffer a freeze-drying effect. Living beings are drained of water and crumble apart.
- Xanatos Speed Chess: She's both the victim and perpetrator of such plans:
- As a victim, Ayu is unaware that she's actually a contingency plan, in case Misaki is ever killed or disposed of. Both girls were noted to have similar potentials and powers, even now, and if Misaki is ever removed from the equation, the researchers have deemed Ayu as a suitable replacement for her.
A golden retriever made a Kihara by expanding the canine's brain, giving him human-like intelligence and lifespan. First mentioned in passing in the 4th New Testament volume, he properly appears at the end of the 7th volume. Not much is known about him, but recent novels have been gradually revealing more.
- Affably Evil: A calm and polite gentle(dog) who has an appreciation for combining mecha, drills, and pile bunkers. He hates unnecessary waste, violence, and sacrifice, but will murder anyone who happens to oppose the Kiharas if he thinks it's necessary. He's also aware of how terrible of a person this makes him, but he does so anyway out of sheer loyalty to his creators' visions.
- Almost Dead Guy: He's beaten to near death by Kamisato. In order to save him, Yuiitsu freezes him.In the final arcs of New Testament, he has recovered no worse for the wear thanks to Heaven Canceller.
- Blue-and-Orange Morality: Shares his creators' mentality of For Science!, and thus his distaste for wanton destruction and waste has to do with likes and dislikes rather than morality.
- The Dragon: Seems to be one to Aleister, as he has direct contact with him and is more aware of his plans than most other characters in the series so far.
- Even Evil Has Loved Ones: He was especially fond of his dead master, and seems to truly care for the safety of Yuiitsu Kihara.
- Even Evil Has Standards: Unlike most Kiharas, he has a code of ethics and dislikes unnecessary destruction, though it's more about what he likes and dislikes rather than the actual morality behind it.
- Kill the God: New Testament 12 shows hints that Aleister has equipped him with enough capability to take on Magic Gods. He personally states that he specializes in cases like Fraulein Kreutune and Aiwass as well. Whether he actually can do so has yet to be seen.
- Know When to Fold 'Em: While talking with Yuiitsu, he shoots down her suggestive ploy to turn against Aleister. Noukan explicitly tells her that they can't even dream of defeating or outwitting him.
- Meaningful Name: His given name means "Brainstem".
- Mentor Occupational Hazard: He advises Yuiitsu as an almost fatherly figure with Yuiitsu adoring him in turn. Of course, he gets beaten near to death by Kamisato and has to be put in cryogenic stasis to preserve his life.
- Older Than They Look: His human speech is described as sounding like the voice of a man in the prime of his life, but he is actually 80 years old, far beyond a normal dog's lifespan.
- Otaku: He's a mecha fan, particularly that of the combining mecha genre, and will disregard profits and gains just to make cooler drills and pile bunkers.
- Science Destroys Magic: His Anti-Art Attachment Powered Suits were created with the express purpose of fighting magical threats. Using them, he managed to easily beat a Magic God.
- Smoking Is Cool: Frequently smokes cigars in his appearances.
- Talking Animal: He is described as having the voice of a man who seems to be in the prime of his life.
- Undying Loyalty: He's so devoted to the Kiharas' mission that Kamisato's World Rejecter cannot affect him.Noukan: Its true my weapons might not be of any use. If I think about the path taken by the one who made and uses them, I do have to wonder if he wholeheartedly wishes for an entirely perfect plan. Between good and bad, its a foolishly bad, but between like and dislike, I foolishly like it. But, if you asked me, and the things that give me form, whether I wanted a new world, the answer would be no. Boy, I have intelligence. I know the original seven who gave it to me. I understand their wills and I have attempted to follow in their footsteps. So my thoughts and my personality would never stray from the path and would never hold conflicting desires when faced with the kind of salvation presented by someone who can only rely on the supernatural. I will live and die in this world. Whatever result that brings, I will face it, I will confirm the answer of the Kiharas that it leads me to, and I will complete the task the original seven began.
- Uplifted Animal: Capable of speech, he was at first a normal golden retriever before being given intelligence by one of the first Kiharas.
Leader of a three-man team targeting Accelerator to secure DNA samples. She uses the Ultra-high Pressure Water Cutter stolen from a raid on secret research facility.
- Canon Foreigner: Created for the anime version of A Certain Scientific Accelerator.
- Catch Phrase: Has a tendency to mention how "radical" things are constantly. Accelerator mentions how annoying this is as soon as he sees her.
- Cool Sword: Literally. Her main weapon is a set of pressurized liquid nitrogen blades that can cut through armor and bone.
- Hot-Blooded: Youko wants to fight with Accelerator to get his genetic sample.
- Powered Armor: Her Ultra-high Pressure Water Cutter functions as this, covering her arms, legs, and back.
Second girl of a three-man team targeting Accelerator to secure DNA samples. Shes uses a skill Accelerator calls Aero Separator.
The only guy in the three-man going after Accelerator. He has no ESPer skills, but is a muscular man who serves as the muscle when a fight is about to start. Hiromi also lugs ammo for Youko's Ultra-high Pressure Water Cutter.