Badass Abnormal: He was known as the Black Reaper even before he ended up with his sister's powers. The electrical manipulation just makes him even scarier.
Badass Longcoat: So badass, in fact, that the coat is bulletproof only when he wears it.
Big Brother Instinct: Towards the aforementioned little sister in the past, and, depending on whether you're wearing Shipping Goggles or not, Yin. Toward the end of the second season, he also starts to treat Suou this way.
Chiaki: You are going to get so fat. Sure, maybe you can get away with it now, but once you hit thirty and your metabolism slows down— well, if there's any justice in the world...
Bishōnen: First manga only. The art is much more stylized than either anime series or the second manga, making him look pretty instead of handsome.
Break the Cutie: Heaven's War and most of the interquel OVA.
Broken Faceplate: One of the most common and effective ways to show that a foe is to be feared is for them to break Hei's mask.
Chick Magnet: Boy howdy. Almost every woman he interacts with either falls in love with him or treats him as an honorary family member, be they an Emotionless Girl, a Magnificent Bastard, the Fair Coptrying to catch him, or someone whose first sight of him was the (apparent) murder of her father.
Combat Pragmatist: Has absolutely no qualms about attacking from ambush, playing dead, using anything handy as a weapon, or using supernatural powers in a fistfight, and will hit girls if he needs to.
Cover-Blowing Superpower: At one point, he's undercover as a waiter in a restaurant, and a violent, drunk customer tries to walk out without paying and he ends up in the way. HilariousDeadly Dodging ensues.
Dull Eyes of Unhappiness: Permanently. Because his eyes are black, you can count on one hand the number of times you can tell the pupils from the irises, and they get stylized to dark blue-gray. We never once see light reflecting off them.
Quite a few contractors display this in the series, to signify how they aren't happy, or anything else regarding emotions for that matter. Which makes the revelation that Hei isn't properly a Contractor and doesn't have their sociopathy all the more horrible, because he was already like that before he got powers.
Evil Sounds Deep: Evil is pushing it but Li and Hei sound different.
Expressive Mask: Very subtly. While his mask's mouth is usually angled upwards in a grin, during serious scenes it's angled downwards (with a little help from the camera) into a much more somber/neutral expression.
Face Palm of Doom: All the time; it seems to be his preferred method of frying someone.
Fan Nickname: Chinese Electric Batman, for pretty obvious reasons. In the second season, with the addition of Wild Hair and Perma Stubble, he has been dubbed "Hobo Hei."
Or "Heibo", if you're one of those informal types.
Good Eyes, Evil Eyes: Watching Hei's eyes in an episode where he's mostly being Li is highly entertaining, just to see if you can spot the moments where his personality switches. In general, as Li, they're either closed or very wide, and narrower the rest of the time.
Grappling-Hook Pistol: Or rather, retractable cables with snap-hooks. Though twice, when he's had to get a cable particularly far away, he used a crossbow.
Half-Human Hybrid: He's not quite a Contractor- he has his sister's powers, but normal emotions and no remuneration.
Heroic Neutral: He'd really prefer to just be left alone, but the Syndicate isn't about to let someone so useful get away from them. Consequently, although he usually just does what he's told, he's still the group's loose cannon and will occasionally ignore orders entirely.
He's Back: While he starts off the second season in rather bad shape, by episodes 8 and 9, he's looking and acting more like his old self, depower be damned.
Immune to Bullets: Thanks to his coat. Subverted when Huang shoots him in the leg when he isn't wearing it and he spends the rest of the episode limping.
Important Haircut: Once he arrives back in Tokyo in the second season, he does this to illustrate his return to his former self.
Just A Flesh Wound: He doesn't tend to get slowed down much by stuff like a bullet through his leg or a spar of wood a foot long stuck in his shoulder.
Lightning Can Do Anything: Averted most of the time, but given that the ability underlying this is quantum manipulation of matter, there are... exceptions. Especially when Hell's Gate is involved.
Offscreen Teleportation: Once, he managed to disappear from about ten feet in front of Kirihara in the time it took her to put on her glasses, while she was pointing a gun at him and he had a bullet wound in his leg that had him limping badly. And there wasn't anything tall enough to do a Building Swing escape in the area, so that possibility is out.
Only Known by Their Nickname: "Hei" is Chinese for "black," and odds are pretty much certain it has nothing to do with his real name.
Paper-Thin Disguise: Played with. When he's on a job, he wears a white mask and a bullet resistant black overcoat. However, it's less of a disguise, more of means to keep witnesses from getting too close a look at him. It works because he moves too fast for anyone to get more than a glimpse of The Black Reaper.
Reality Warper: Shock and Awe is only one manifestation of a more general quantum-manipulation ability that Dr. Schrader mentioned could even be used for Super Empowering. When he's in the Gate, he can basically restructure everything around him.
Secret Identity Identity: He has distinctly different personalities as Li, Hei, and the Black Reaper.
Shell-Shocked Veteran: While nowhere near as severe as Havock, he still hasn't gotten over Heaven's War.
Borderline Stoic Woobie; remember his traumatic personal history and that he never wanted to be involved in any of this and the only reason he's working for the Syndicate is that they'd kill him if he tried to leave, and the reason he pretends to be a vicious, emotionless killer becomes a good deal clearer.
Superpower Lottery: A low-key win at first glance; he's got a pretty powerful attack that can also be scaled back for nonlethal takedowns, and doesn't have to go line up pebbles or anything similarly inconvenient every time he uses it. However, it turns out he really hit the jackpot— his powers are from his sister, so he's got no remuneration, and under the right circumstances he's an honest-to-god Reality Warper.
Took a Level in Jerkass: Something happened between him and Yin in the Time Skip between the two seasons, and as a consequence for much of the second season he acts like a drunken, violent jerk.
Touch of Death: If he can touch you, he can zap you to death.
Tranquil Fury: When he's angry, it's a vicious, cold anger.
The Worf Effect: The interquels and second season feature quite a few instances of this, though it makes some sense when you consider that he had the element of surprise in almost every fight he got into in the original series.
Yin
A doll assigned to Hei's group. A clairvoyant Emotionless Girl with the ability to project surveillance specters through water, she acts as the group's recon unit.
In the second season, she develops a Superpowered Evil Side, Izanami, that causes Contractors to turn their powers on themselves and is apparently trying to cause The End of the World as We Know It. She manages to suppress it, but winds up comatose— and when someone wakes her up, Izanami wakes up with her.
Blind Seer: It's not obvious that she's blind until a flashback from before the appearance of the Gates, since her abilities pretty much perfectly compensate for it.
Not Herself: At one point in the Gaiden OVAs, she speaks up out of the blue and starts coldly analyzing the problems with Hei's plan, then suggests another idea. He's rather creeped out, and it only gets worse a minute later when she says she doesn't remember saying anything.
Not So Stoic: She starts crying in one episode and occasionally shows evidence of a crush on Hei.
Only Known by Their Nickname: Huang, which means yellow, fits the color theme of the group, but his actual name (as revealed in episodes showing his past) is Kuno.
Pretend Prejudice: He never stops calling Contractors monsters or insulting Hei, but is ultimately pretty friendly with the rest of his team.
The Heart: While it's not obvious given his kind of snarky tone, Mao is one of the nicest Contractor characters and tends to bring out the best in Huang and Hei.
Unexplained Recovery: There's no real explanation given for why he's fine again in Season 2.
Actually, he mentions that he had a backup stored, but he lost all his memories from the gate incident.
Insistent Terminology: Mao is very clear on the point that he's not a squirrel, just a cat temporarily in a squirrel body.
Mundane Fantastic: Very few of the people he interacts with are particularly surprised by a Talking Animal. However, this is probably just due to exposure, since several characters are very surprised when he starts talking.
Non Indicative Name: Mao worked fine when he was in a cat body, but now he's a squirrel...
Voices Are Mental: His voice sounds exactly the same (and disproportionately deep) as a cat, a bird, or a flying squirrel, and one character who knew him as a human recognizes him by it.
Suō Pavlichenko
The second main protagonist, besides Hei, of Season 2, a half-Japanese half-Russian schoolgirl. Her father is a scientist studying ME and her brother is a Contractor; her mother is a photographer who moved to Japan eight years ago. She gets pulled into the plot because of attempts to capture her twin and winds up hanging around Hei. In the third episode, she develops the Contractor ability to summon an anti-tank rifle and wield it easily despite its size.
Cloning Blues: According to her mother, a copy of the real Suou. According to her father, an Opposite-Sex Clone of Shion. Either way, she's upset about it, and angsts until Hei snaps her out of it.
Half-Human Hybrid: Like Hei, she has Contractor powers while retaining human emotions/morals. Unlike him though, she does have a Remuneration and temporarily loses those emotions/morals when her powers activate.
Superpowered Evil Side: When being driven to the brink, her necklace becomes a BFG and she becomes a merciless Contractor, albeit one who wants to kill other Contractors for their evil actions. After this first time though, she retains her morality when using her powers.
Super Power Lottery: While she doesn't necessarily win it, her Contracter powers are far different from powers shown up 'til then. Every other power shown grants manipulation of matter, energy, or elements in some way, or amplifies attributes of oneself or one's surroundings, requiring some creativity for practical use. Suou, however, summons a big gun, complete with transformation sequence. The relatively unique, unsubtle, and showy nature of her power has led to much varied mileage over her character, with accusations of Mary Sue-dom being common.
Unperson: After the incident that kicks off the whole mess, she gets wiped from all her friends' and acquaintances' memories.
Tokyo Metropolitan Police Department Public Security Bureau
Misaki Kirihara
The head of the TMPD's PSB Foreign Affair Division, Section 4, which covertly deals with contractor-related crimes and terrorism; she takes a special interest in the cases related to BK-201 that starts to grow into an obsession with time.
Fatal Attraction: She falls for Hei even though she connects him to BK-201 as early as episode 18. It takes a couple suspicious coincidences, a partially-cracked mask, "Li" slipping into his Black Reaper voice, an accidental Meaningful Echo, and some surprising openness on his part before she figures it out/admits it to herself.
Genre Savvy: Part of the reason she's obsessed with Hei. She's figured out that he's going to be at the center of any world changing event that happens in the future.
Go-Go Enslavement: Alice insists on dressing her in a qipao as punishment for forgetting about her party.
Nepotism: Her father is ranked above her on the police force. She doesn't appreciate his attempts to ensure the correct progression of her career. In the second season, she quits her job out of frustration and a wish to find Hei.
Stalker with a Crush: She's still trying to find Hei in the second season, even though she's no longer working for the police department. And by "trying to find" I mean "obsessively watching the star BK-201 through a telescope." Kanami informs her that she needs to get over him and find another guy.
A member of the task force and closet Big Name Fan.
Bunny-Ears Lawyer: Likes to read and write erotic fanfiction and can be kind of ditzy, but also shows some competence, figuring out BK-201's identity when the rest of the police force failed miserably.
Stalker with a Crush: She stalks Hei for a few days, leading the group to suspect that she's working for someone to try to interfere with their mission.
Too Dumb to Fool: Not dumb exactly, but like the other Wrong Genre Savvy characters, she makes some accurate deductions, despite having odd logic and sometimes the wrong conclusion- she figures out that "Li" is the Black Reaper on account of his "sexy collarbone"
Captain Ersatz: Of James Bond, but also likely Iceman from X-Men- not only are both blond and have the same powers, but Iceman was Fun Personified, and November 11's warped sense of humor might be a dark take on that.
Elemental Eye Colours: He has very light blue eyes that can most definitely be described as "icy". This is appropriate, since he's a sociopath with ice powers.
Second Face Smoke: In his introductory scene, he's dealing with some gangsters and voices his extreme disapproval of smoking early on. When they try to double cross him, one of them lights up and contemptuously blows smoke in his face. Big mistake.
Shout Out: He is a secret agent. He is an only guy whose name is a month and a date - a certain guy's birthday.
Smoking Is Cool: Sometimes subverted, sometimes played straight; the first time we see him dealing with his remuneration, he starts hacking out the smoke in a decidedly un-cool way, but the rest of the time he makes it look good.
Touch of Death: Like Hei, if he can touch you, he can kill you.
A contractor on November 11's team who can create storms at will.
Actor Allusion / Captain Ersatz: Her Japanese voice actress dubs many Halle Berry characters, including Storm of X-Men, with whom she shares weather-control powers and appearance.
Faux Action Girl: In the episode where she's injured, Huang shows Hei a sheet of paper listing her kills which are numerous, but in-series, she just assists November 11 and schleps July around. Although she does manage to score a kill on the enemy contractor Goran. Not to mention nearly killing Hei ... until he kills her of course.
Heart Is an Awesome Power: Her abilities are deadly in combination with November, and she pulls off a Crowning Moment of Awesome against a guy with Super Speed at the start of the second season by giving him a ratherpainful physics lesson. She then follows up by summoning a swirl of water around her next opponent's head to drown him on his feet.
Making a Splash: The second season shows that her powers extend at least a little beyond rainstorms.
You Gotta Have Blue Hair: Weirdly, she is introduced with black hair in the second season, which makes you think that her hair might have been dyed. Nope- the black hair is a wig covering her apparently naturally blue hair.
July
The Doll assigned to November 11's team. In the second season, he joins Hei, Suou, and Mao.
Sugar and Ice Personality: Only November 11, April, Kirihara and Suo seem to be aware of the dere side. To be fair, it's mostly for them.
Tagalong Kid: Particularly in the second season, where he just sticks around for lack of other options. Or possibly lack of other reasons to be around Suo.
The Unsmile: He uses his fingers like Yin. Unlike Yin, his goes back to creepy.
It even manages to creep out Hei in full Jerkass mode.
August 7
A Contractor introduced in Season 2. He is part of the same team as April and July.
Achilles Heel: He can pretty much do anything as long as he is looking at you and you at him, but Hei throws his longcoat over August's head and electrocutes him while he is powerless.
Blessed with Suck: He's a former stage magician and received the power to do real magic, something which would make him the greatest magician ever. Unfortunately, his Remuneration is to give away how magic tricks work, something which hurts his pride as a former magician and takes away any professional benefit he could get from his powers.
Hollywood Tactics: If you're effectively immune to ranged attacks and you're up against a ninja known for ingenuity, it would seem like a good idea not to let him get close.
Superpower Lottery: A real winner, since he pretty much has the power to do anything if someone is looking at him.
Suspiciously Similar Substitute: Referred to by some fans as the "New November 11". Actually an aversion though, as his openly psychotic personality is closer to that of Wei in the first series.
The founder of Evening Primrose, who used to work for The Syndicate, the CIA, and MI6 and betrayed all of them. She was in South America during Heaven's War, and Hei considers her responsible for what happened at its end.
She can manipulate time, and her remuneration is getting younger.
Femme Fatale: Just ask Hei. ...although he'd give you the wrong answer. Hei thinks she is, since she betrayed his group in Heaven's War. However, his sister was in on it too, and they didn't tell him because they both knew that continuing to work for The Syndicate was safer for him in the long run. She still loves him and wants him to be happy.
Meaningful Name: The mineral amber led to the discovery of electricity; see the entry on the main page for details.
Necessarily Evil: Seen in how even in her "kill all Japanese humans" plan, she was willing to use the last of her power and seemingly Ret Gone herself.
Omniscient Morality License: Literally: Because she can see into any number of possible futures, she does morally questionable things on the logic that it is the best plan possible.
Oracular Urchin: Since she's a lot older than she looks and has a limited ability to see the future.
Disney Death: Seemingly burnt to death along with Brita at the end of the first season, he shows up in the third Gaiden, but now is bald with some signs of scarring, and has an Eyepatch of Power over his "shut" eye.
Kick the Son of a Bitch: Runs around blowing up buildings, hints that he intends to do more, attacks Hei because he's jealous and runs November 11 through a gauntlet for no real reason when his time would be better spent escaping. Not even Amber is sad when he dies.
Naked on Arrival: Her teleportation can't carry anything non-living, so this applies to anyone she teleports, including herself. Oddly enough, she does retain her purple lipstick through the teleportation]].
Technobabble: Speaks almost entirely in it, except when he's making bad jokes.
Meena Khandar Swami
A scientist working at the laboratory in the Gate who got her position by making a deal with The Syndicate. Acts as Hei's contact when he infiltrates the place.
Punchclock Villain: The only reason she's involved with The Syndicate at all is so she can work at the Gate, and her contact with Hei is apparently the only time she's actually had to do anything for them.
Birds of a Feather: He and "Li" are both Nice Guy borderline-stoics who want to make the world better for their little sisters, and they get along really well. They even have the same powers.
Evil Counterpart: He even has the same powers as Hei (the main difference is Hei's powers are straight Reality Warping that he uses almost exclusively for electricity, while Nick's are actually electricity)
A group of Japanese agents introduced in Season 2.
Genma Shizume
Part of the team dedicated to hunting down Hei and Suou, a contractor with the ability to turn solid objects into heavy armor. Has a habit of hitting on everyone he encounters.
Bait the Dog: Genma initially comes across as an affable, jokey Lovable Sex Maniac, and a pushover at that, since Suo "defeats" him by throwing a trash can over his head. Further appearances establish him as a pedophilic sociopath who finds wanton brutality incredibly amusing.
Depraved Bisexual / Anything That Moves / general pedophilia: Genma makes so many sexual references that it's not quite clear what "direction" in which he swings or even if he's restricted himself to a "direction". Still, he seems to attracted to children.
Made of Iron: His power involves coating himself with nearly impenetrable armor. However, anti-tank fire can damage it and it doesn't do a damn thing against a laser katana to the eye.
Badass: Had not one, not two but three fights with Hei. In the final fight with him, she nearly killed him and possibly would've...if Hei had actually been responsible for Yoko's death.
Does Not Like Men: Unfortunately for her, her Remuneration is to French kiss them.
Even Bad Women Love Their Mamas: Despite being shunned by her family, being informed that her mother is dying distracts her during a fight with Hei, and she muses about still having some caring towards her mother.
Evil Counterpart: Has similar dress sense, weaponry, and personality to Hei; her background as The Ojou who broke from her powerful family is rather similar to that of Kirihara.
Bait the Dog: Initially appears very moe as well as friendly and outgoing, but she follows in the footsteps of the similarly affable Dr. Shrader in having For Science! as a mantra, pursuing "experiments" without concern for human life.
Stuffed into the Fridge: Genma kills and rapes her messily to shut her up. Due to circumstances, Hazuki blames it on Hei and makes a very nearly successful attempt at revenge since It's Personal.
A contractor serving the Chen Long Tang crime family. His power is to blow holes in anything he gets blood on. Later joins Amber's group in order to fight Hei again.
Badass: He's an evil psycho. But in a series where most people can't even come close to standing up to the main character, Wei nearly kills him two or three times.
Cursed with Awesome: His remuneration is cutting himself, which he has to do anyway to use his powers.
Dragon with an Agenda: Has to share the post of The Dragon with Amigiri, but otherwise fits in relation to Amber: the only reason he helps her is so he can fight Hei again.
Finger-Lickin\' Evil: He's been seen to slurp blood off his hands after killing someone.
Good Scars, Evil Scars: Evil ones- his arms are covered with scars due to him cutting himself to use his powers/pay his Renumeration, and after Hei electrocutes him, half of his face and body is burned.
Awesome McCoolname: He renamed himself because he thought his real name wasn't cool enough. As with his attempts at Smoking Is Cool, little success was had.
The Fool: He keeps accidentally and unknowingly wandering into extremely dangerous situations, and only the fact that he's an idiot keeps him safe.
Too Dumb to Fool: The only person to notice that that one Chinese exchange student keeps showing up in weird situations. However, he quickly decides that it's probably a coincidence and he's being paranoid.
Genre Savvy: Has occasional flashes of this amidst a lot of Wrong Genre Savvy; for instance, she accurately diagnosed someone under the influence of ME.
Nonstandard Character Design: She generally uses a lot of standard anime effects that the rest of the series ditches in favor of a more realistic style, and even gets Super-Deformed a few times.
Wrong Genre Savvy: Tends to apply anime tropes towards real life. While this does mean she correctly diagnoses a victim of Laser-Guided Amnesia, it also means she thinks "Li" is a shojo love interest.
Quite possibly the most dangerous contractor in existence, she killed hundreds or even thousands in South America- and then something happened that removed her powers and some of her memories but restored her emotions to normal. Now she's wracked with guilt over what she did, leaving her as probably the only case of a woobie who ate babies in history.
Two Contractors working for FSB to capture Yin. Bertha's power allows her to force objects to resonate, usually breaking them, although it can also stop someone's heart; Itzhak can absorb observation ghosts and use them to manipulate and control the minds of dolls.
Pillar of Light: A side-effect of Itzhak's power; when he dies, all the observation ghosts he's grabbed disperse at once, creating a huge version.
Warrior Poet: Literally, in Itzhak's case: his remuneration is writing poetry.
What Kind of Lame Power Is Heart, Anyway?: Itzhak has one of the most specialized and useless-in-combat abilities we've seen, which is presumably why he was paired with someone who can kill quietly and almost instantaneously or cause massive structural damage.
Harvest
The primary antagonist of the Interquel manga, Shikkoku no Hana. His power is to dissolve matter, and this ability to manipulate the connections between atoms allows him to give normal humans Contractor abilities.
Deadly Upgrade: Yeah, he'll give you superpowers. But watch out for that flower...
Deal with the Devil: Has the ability to give humans Contractor-like powers. However, they have to kill their closest friend to do it, and they start turning into walking plants.
Evil Counterpart: His Contractor power involves the ability to manipulate electrons, similar to Hei, and as a result he can also grant normal people powers.
Necromancer: His powers allow him to raise the dead.
Nigh Invulnerability: Since he can break down pretty much anything, bullets are completely useless and even attempts to gas him just result in him chemically decomposing the gas. The cops manage to hit him with tranquilizer darts and electricity.
A young schoolgirl Hei encounters in Shikkoku no Hana. After being seduced and betrayed by her coach, Daisuke Mioka, she desires to become a Contractor in order to exact revenge. And then she meets Harvest...
Heel Face Door Slam: She's not dead (yet?) but she would be marginally okay if she had spared her teacher. Of course, she WOULD'VE spared him (at Hei's urging, of course) if he had decided to not be a dick at that very moment.
Interrupted Cooldown Hug: A non-hug version: Hei has pretty much managed to talk her down from her Roaring Rampage of Revenge, when her coach comes up behind her with a taser and knocks her unconscious. Retribution was not long in coming, from both Hei and Azusa.
Shoot the Shaggy Dog: Hei puts a lot of effort into trying to convince her to stop her rampage before the flower blooms and she's completely screwed. She decides to finish it at the last minute anyway, though he kinda deserved it.
Too Dumb to Live: Really, Daisuke? You're going to taser someone that you know would love NOTHING more than to kill you in the most horrible way possible, right when they decide to spare your life? Really?
And even if she hadn't killed him for that, Hei certainly would have.
Parcel
A contractor of one of PANDORA's many factions working to kill Harvest. Her power is teleportation through use of black portals. Her Doll is a modified cyborg named "Champ."
Teleport Spam: Parcel has no compunctions about using her powers all the time, for just about everything, possibly because her remuneration isn't very harsh.
Suo's brother, who was transformed into a Contractor. His power is to produce copies of things and people with one trait changed, and his remuneration paralyzes his legs, putting him in a wheelchair most of the time.
MacGuffin Girl: A male variant, since the reason everyone's chasing Suou is to catch him. However, it turned out he was a lot more active than we were giving him credit for.
Madwoman in the Attic: After he became a Contractor, his father imprisoned him in a metal room from which he couldn't leave. Or maybe not. Dad and son are in cahoots. It's... complicated.
Mismatched Eyes: He lost the use of an eye in the explosion which turned him into a Contractor, so while both of his eyes are green, the injured eye is much lighter and missing a pupil.
Otaku: On account of being imprisoned and his Remuneration, which left him temporarily crippled.
Power Degeneration: His remuneration makes him very weak, although it seems he can recover with no ill effects given enough time.
Twin Switch: Has Suo take his clothing in the first episode, so she can escape. However, given later events, it seems more likely to have been so he could escape...
Dr. Pavlichenko
Suo's father and the inventor of a device which can pull memories from people even after they are dead. Later revealed as an early member of The Syndicate.
Mismatched Eyes: The reason he wears those glasses all the time is that while one eye is bright blue, the other is completely dead and white with a nasty scar over it.
Transhuman Treachery: The way she immediately turns into a utterly emotionless killing machine seems to conform with all of the worst stereotypes about Contractors, which is pretty jarring after the first season went to all that effort to convince us it wasn't justified.
Possible Fridge Brilliance here, contractors seem to get better at using logic to work there way around to morals as they live longer.
Ilya Sokoloff
A Russian Contractor featuring in the second series
Ax Crazy: Played with: While most Contractors can kill without much thought, becoming a Contractor actually made him less kill-crazy. Also, theoretically, he now kills in the most painless way possible. But, yes, he's still crazy.
A Contractor who features as a major antagonist in the interquel OVAs.
The Bad Guy Wins: Despite being shot and nearly bleeding out, he still manages to slaughter many Contractors that wanted to live in peace and forces Yin into awakening Izanami, creating a worldwide threat that could kill many humans and Contractors and setting up the second season. He still ends up dying due to Izanami, although it is less of a Karmic Death since he seemed to enjoy being killed by Izanami as he knew he had already won.
Attractive Bent Gender: His disguise as Amber actually isn't all that different from his true appearance.
Bishōnen: Looks similar to Amber from the first season. But while Amber was an Anti-Villain, Shichi is just evil.
Fantastic Racism: Reveals he doesn't like humans to intelligence agencies paying him a ton of money for Yin/Izanami...Shichi tosses their money away and manipulates the situation so everyone there will die. Though he didn't see himself dying, probably, but didn't care because he won in the end of the OVA.
The Social Darwinist: Due to being exploited by humans, he began to wonder why Contractors don't exploit humans...after all Contractors have powers and humans don't.
The Sociopath: Seems to have no attachment to others, even killing his partner who he seemed to be friendly with and had no problem killing a lot of Contractors, despite his claims that Contractors are better than humanity and his dream of them ruling humans. Whereas other Contractors have felt some emotion towards others, Shichi's emotions can be summed up as spite against humans.
The Hero (well, for a given level of "hero"), a.k.a. Li Shengshun, a.k.a. Lee Hyeonsik, a.k.a. BK-201, a.k.a. LI-KUN!!! a.k.a. The Black Reaper, a.k.a. Chinese Electric Batman. An agent of The Syndicate, doing their dirty work to retrieve items and information related to Hell's Gate. He works undercover as Nice Guy exchange student "Li Shengshun," taking menial jobs wherever the higher-ups need him, relying on his apparent naivety to avoid suspicion. He has the Contractor ability to manipulate electricity and the most awesome coat in the universe, and is a weapons-grade Chick Magnet to boot. 
A doll assigned to Hei's group. A clairvoyant Emotionless Girl with the ability to project surveillance specters through water, she acts as the group's recon unit. 
Hei's "handler," a Syndicate employee who relays his instructions and acts as backup when necessary.
A body-swapping contractor trapped in a cat's body who helps Hei's group.
The head of the TMPD's PSB Foreign Affair Division, Section 4, which covertly deals with contractor-related crimes and terrorism; she takes a special interest in the cases related to BK-201 that starts to grow into an obsession with time.
MI6's top agent, assigned to Japan to investigate Gate-related activity. He has the power to freeze liquids and a rather James Bond-like attitude.
The founder of Evening Primrose, who used to work for The Syndicate, the CIA, and MI6 and betrayed all of them. She was in South America during Heaven's War, and Hei considers her responsible for what happened at its end. 
