- Above Good and Evil: Goes hand in hand with their Blue and Orange Morality.
- Adaptational Badass: The previous television incarnation of HIVE was an evil school that trained teenage villains. Here, they're a powerful secret organization determined to conquer the world.
- Ancient Conspiracy: They've been around a while, that's for sure.
- Animal Motifs: Bees: organized workers working in harmony for one specific goal. Mina Fayad even describes herself to Deadshot as "a drone".
- Blue and Orange Morality: Its founder's plan for bettering the world involves at least one entire city's destruction.
- Brainwashed and Crazy: Several of the troops are taking pills that control their minds.
- Cool Shades: The foot soldiers are all seen wearing sunglasses. Strangely, even at night.
- Cult: Definitely has the vibe of one. Much more than the League of Assassins.
- Early-Bird Cameo: Their name gets dropped by Deadshot back in season 2, when telling Diggle who hired him to kill Andy.
- Even Evil Has Standards: They like neither chaos nor Nazism.
- Evil Plan: It's revealed, in the appropriately named episode "Genesis", that the H.I.V.E. intends to use a device called Rubicon to control the world's Nuclear Arm supply in order to nuke the planet and rebuild it in their own image. In order to survive the blast they created a bunker underneath Star City the size of a small town with a breathable artificial environment.
- Evil vs. Evil: They have had run-ins with The League of Assassins in the past.
- Evil Wears Black: They mostly dress in black suits.
- Expy: A Nebulous Evil Organisation whose agents encounter the hero before he comes into direct conflict with them. They're also led by a mysterious man with a penchant for inventive You Have Failed Me executions. Not unlike SPECTRE. Ray even compares H.I.V.E. to SPECTRE at one point. In what seems to be a Shout-Out, Darhk's appearance in Legends of Tomorrow has him dressed in a grey Nehru suit, much like Ernst Stavro Blofeld.
- Fun with Acronyms: Assuming that they follow the comics, then their group name stands for "Hierarchy of International Vengeance and Extermination".
- Greater-Scope Villain: They were subtly causing trouble for Team Arrow long before they decided to full on invade Star City.
- Imperial Stormtrooper Marksmanship Academy: The mooks can't shoot for crap.
- Kill 'Em All: After their underground city is destroyed by Anarky, Darhk orders his organization to destroy the entire world with them on it.
- Malevolent Masked Man: The Ghosts are all disguised in masks.
- Mildly Military: Their trained troops act like a professional military unit rather than terrorists.
- Multinational Team: The group is quite diverse.
- Names to Run Away from Really Fast: If their aforementioned Fun with Acronyms is true.
- Nebulous Evil Organisation: They're an illicit criminal organisation of ambiguous purpose.
- Not Brainwashed: The civilians living under HIVE's new secret society reveal to team Arrow that they are not being manipulated by Darhk, but actually do view him as their savior.
- Nuke 'em: They attempt to blow up multiple cities across the globe, but naturally Team Arrow stops them.
- Omnicidal Maniac: They plan to destroy the entire planet in order to rebuild it from the ashes that remain. Even after Team Arrow destroys their entire underground bunker, Darhk still chooses to destroy the entire world with HIVE on it.
- Redshirt Army: The Ghosts are all expendable soldiers who get frequently killed by Team Arrow. Even their own Bad Boss thinks of them as disposable.
- Shout-Out: The troops working under Darhk are all highly-trained, terrorist foot soldiers who are Brainwashed and Crazy donning heavy armor and mysterious masks, called the Ghosts.
- Start My Own: Darhk created the group after he failed to become the next Ra's Al-Ghul.
- Stepford Suburbia: HIVE has prepared one underground to rebuild the world after the surface is nuked. However, Anarky destroys it.
- The Syndicate: An Ancient Conspiracy that is also a criminal organisation.
- Take Over the World: Their Evil Plan.
- Übermensch: Much like The League of Assassins, the group has their own code of morality.
- Western Terrorists: They're terrorists from the western hemisphere.
- Why Don't You Just Shoot Him?: The troops carry guns on them all the time and usually have victims in their sights, but not once do they ever take the shot and instead resort to fist fighting.
- Zerg Rush: In the season 4 finale, the troops decide to physically rush Team Arrow.
Played by: Lynda Boyd (Ms. Nixon) and James Kidnie (Milo Armitage)
Darhk's partners in HIVE. Together they have enough power to make decisions without his approval, and are getting concerned about Green Arrow's interference with their plans for Star City. One of them, Milo Armitage was the one who tried to acquire Merlyn's earthquake machine in Season 2.
- Asshole Victim: Armitage and Ms. Nixon are executed by Darhk for betraying him.
- Bald of Evil: Armitage has no hair.
- Big Bad Duumvirate: They run the organization with Darhk and rank close enough to him that they can make decisions without his approval.
- Boom, Headshot!: Armitage ends up killed with a bullet through the head.
- Early-Bird Cameo: Armitage made an appearance in Season 2 as the man who hired Bronze Tiger to acquire Merlyn's Earthquake Machine.
- Generic Doomsday Villain: Unlike Darhk, they have very little characterization outside being business.minded super villains.
- Greater-Scope Villain: Armitage hired Bronze Tiger to steal Merlyn's Earthquake Machine in Season 2 and orchestrated an attempt to steal ARGUS files in Season 3 for the organization.
- Karma Houdini: Armitage managed to escape justice for his actions in Season 2.
- Karma Houdini Warranty: Armitage ends up executed for attempting to betray Darhk in Season 4.
- Living Prop: Apart from Nixon and Amritage we know nothing about the other three, not even their names.
- Non-Action Guy: None of them are combat proficient. They'll immediately flee the scene if any of the heroes show up armed.
- No-Nonsense Nemesis: Compared to Darhk. They are business-like and have little patience for his "games" and chastise him for letting his petty feud with Oliver get in the way of their Evil Plan.
- Rogues-Gallery Transplant: Milo Armitage in the comics is a foe of Connor Hawke (in part because he was an abusive asshat towards Connor's mother). Here, he's a foe of Oliver.
- The Omniscient Council of Vagueness: Vaguely menacing with a hidden agenda.
- The Starscream: After Darhk is arrested they leave him in jail to rot and move on with their evil plan without him.
- The Stoic: None of them really express much emotion.
- The Team Benefactor: It's implied their main role in the organization is to fund it - via organized crime and the like.
- Too Dumb to Live: Instead of giving into Darhk's leadership, Armitage tries shooting the superpowered Ax-Crazy psychopath despite knowing about his powers. Darhk lampshades this before killing him. Meanwhile, Ms. Nixon attempts to run away from the man who's harnessed People Puppets before. She ends up crushed to death by his power over her body.
- Underestimating Badassery: Sure Damien's their founder, but they think he's an immature, impractical buffoon to be patronized. And he is, but he's an impractical buffoon with MAGIC. When he "force chokes" a senior member with the others as witnesses, they decide to show a lot more respect.
- Visionary Villain: Just like Darhk they share his vision for a new order, and believe Genesis is greater than any one man.
- What Happened to the Mouse?: The rest of the council suddenly vanish by the season 4 finale.
- You Have Outlived Your Usefulness: Armitage and Ms. Nixon are no longer required by Darhk, so he executes them.
Played By Janet Kidder
The wife of Damien Darhk. She aides his evil plans by becoming Oliver's competitor in the mayoral election.
- Aloof Dark-Haired Girl: She displays a graceful demeanor in public but she's really an unpleasant person.
- Asshole Victim: Considering what a smug, egotistical bitch she was, you probably won't shed any tears when her own overconfidence gets her killed.
- Dropped a Bridge on Him: She dies getting stabbed by Anarky and having her own city crumble on her.
- Even Evil Has Loved Ones: She deeply cares for her husband and daughter. Her last words are asking Green Arrow to take care of her daughter.
- Jerkass: She shows nothing but disdain for her own coworkers.
- Karmic Death: She ends up murdered by one of Darhk's underlings who she completely disregarded and dies trapped under her own crumbling utopia.
- Lady Macbeth: To her husband. She is actively pushing him to kill the Green Arrow as soon as possible, regardless of the fact that the hero had just saved her life. She later takes a direct approach by running against Ollie in the mayoral election.
- Living Emotional Crutch: Believe it or not, but she's the only one who keeps her husband sane. After her death, he flips out.
- The Maiden Name Debate: To the public she uses Adams as her last name, but anyone who knows her true alliance refers to her as Mrs. Darhk or Ruvé Darhk.
- Mayor Pain: Aspires to be one to aide HIVE's evil plan. Finally succeeds in "Eleven Fifty-Nine", though it was somewhat of a Foregone Conclusion three episodes earlier when Oliver dropped out of the race.
- Spanner in the Works: She throws a major wrench into Oliver's plans to help Star City when she decides to become a candidate in the mayoral election.
- Ungrateful Bitch: Scolds Damien for not taking the chance to kill Green Arrow not seconds after he just saved her and her daughter. Likewise, her response to Green Arrow saving her a second time was to order her mooks to arrest him.
- Villain with Good Publicity: She has false credentials so nobody can make any connection between her and Darhk.
- Visionary Villain: Just like her husband, she too has grand visions of a new world order.
Played by: Carmen Moore
The HIVE agent who gave Deadshot the contract to kill Andy Diggle.
- Almighty Janitor: Her exact position in HIVE is unknown; she calls herself a "drone", but she doesn't answer directly to Darhk. That said, her rank is still low enough that Darhk can still punish her for failure.
- Back for the Finale: In the season 4 finale, she shows up in Oliver's flashback escorting the cursed idol to Darhk.
- The Cameo: She appears in Oliver's flashback during the closing minutes of the finale, taking the idol to Darhk.
- Early-Bird Cameo: Appears in Deadshot's flashback in Season 3 when she tasked him to kill Andy Diggle.
- Mouth of Sauron: She shows up in Star City, on behalf of Darhk's "partners" to take care of Team Arrow.
- Mysterious Past: Has enough of a history of illegal activities to be on the TSA's watch list.
- Small Role, Big Impact:
- She gave Deadshot the contract to kill Andy Diggle.
- She's also the one to steal Darhk's magic idol for him.
- We Hardly Knew Ye: Darhk kills her in her second appearance since he lost valuable men he assigned to protect her while she was in Star City.
Played By Eugene Byrd
John Diggle's younger brother. Thought to have been killed by Deadshot on behalf on H.I.V.E., his death was merely faked and he was recruited into the organization as a foot soldier.
- Asshole Victim: After all of his backstabbing, double crossing bullshit throughout the season, along with his hand in Laurel's death and threats against John's family, the only person you'd feel sorry for when John finally shoots him is John himself.
- The Atoner: As of A.W.O.L., he slowly seems to be heading this route. It's all a facade.
- Brainwashed and Crazy: Subverted. Darhk gave his foot soldiers some kind of drug to ensure their loyalty, but when they were off Andy is still dedicated to the cause.
- Broken Pedestal: John is not happy to find out that his brother was a minor crime lord in Afghanistan and is now a foot soldier for HIVE.
- The Brute: He's promoted to Darhk's chief enforcer.
- Cain and Abel: The Cain to Diggle's Abel. Apparently even before he joined the military.
- Canon Foreigner: Doesn't exist in the comics.
- Double Reverse Quadruple Agent: He is still on HIVE's side, as Malcolm Merlyn contacts him at the end of Beacon of Hope. He plays his cards so good that he is able to tell John about this and still gains his trust. He even takes an arrow for Oliver, though the latter suspected him from the very beginning, but is unable to convince John until it is too late.
- Elite Mook: Despite being a prominent antagonist, he dresses like a normal ghost.
- FaceHeel Turn: From military hero to petty crime lord and now thug for a terrorist organization.
- Fake Ultimate Hero: Everybody thought he was a war hero, when in reality he was a petty crime lord in Afghanistan.
- Faking the Dead: H.I.V.E. supplied Deadshot with special ammo to ensure he wouldn't die; not even Deadshot knew.
- False Friend: He's this to Team Arrow.
- Faux Affably Evil: He genuinely laughs in Diggle's face about how he plans to kill him and his family.
- Fighting from the Inside: Zig-zagged. Dedicated as he is to the HIVE cause he can't bring himself to kill John in a fight, though he will fight him to a draw and will kill anyone else without hesitation.
- From Camouflage to Criminal: He's a former U.S. Army Sergeant.
- HeelFace Turn: As of "A.W.O.L.", he seems to have thrown his lot in with Team Arrow. As it turns out however this was all a façade as he had never stoped working for HIVE in the first place.
- Insistent Terminology: Andy is quick to take offense at John calling HIVE a cult.
- Jerk with a Heart of Jerk: He starts to come around and befriend his brother. Only to screw him over and laugh about killing his family later.
- The Mole: For Darhk. His redemption was just an act.
- That Man Is Dead: John tells him he's going to treat him like he's a ghost as long as he's loyal to HIVE. Though Andy could care less.
- Morality Pet: Averted with his wife and children. In fact, he was rather peeved when John brought them up as if it was supposed to make him see the error of his ways.
- More Than Mind Control: Even after Darhk's mind control drugs were off he's still loyal to him.
- Named After Somebody Famous: Diggle is named after the famed Hellblazer and Adam Strange UK DC Comics writer.
- Parental Abandonment: John is enraged that Andy would let his wife and children think he's dead.
- Posthumous Character: Subverted. It is believed that he was killed by Deadshot before the series starts but he's only Faking the Dead.
- Straw Nihilist: While John sees the world as something to be fixed, Andy merely sees it as broken and he just wants to survive.
- Stuffed in the Fridge: His supposed "death" by Deadshot's hands is the reason why Diggle hates the man to the core.
- Taking the Bullet: Gets himself shot to save Oliver, however this was all done to gain his trust.
- Tuckerization: Named after the author of Green Arrow: Year One.
- Undying Loyalty: To Darhk, much to John's immense disbelief and sorrow.
- Walking Spoiler: A major one since he was thought to be dead for the first three seasons.
Michael Amar / Murmur
Played by: Adrian Glynn McMorran
A criminal who was originally sent to Iron Heights on a false confession, gunning for revenge on the SCPD for putting him away.
- The Brute: Becomes this to HIVE.
- Demoted to Dragon: He joins up with Damien Darhk, becoming his right-hand man.
- Lean and Mean: He's skinny and a murderous gangster.
- Mouth Stitched Shut: Where his street name comes from. It's never specified how it happened, but it's implied that it was self-inflicted. Felicity mentions that lip sewing is a form of meditation and discipline and one of the possible reasons why his mouth is that way.
- Related in the Adaptation: He and Damien Darhk are actually relatives in this series.
- Rogues-Gallery Transplant: Murmur is one of Flash's rogues in the comics.
- The Speechless: His mouth has quite literally been sewn shut. He gives orders through a mook who's his Mouth of Sauron.
- Took a Level in Badass: He goes from being a common Villain of the Week into The Brute for Damien Darhk.
- Undying Loyalty: To Damien Darhk.
Cooper Seldon / Brother Eye
Played by: Nolan Funk
A mysterious group of cyber-terrorists who attack Starling City, threatening to collapse its already fragile infrastructure in order to punish them for their corruption and greed. The leader of this group is Cooper Seldon, Felicity's hacker ex-boyfriend from MIT who was arrested for attempting to erase some student loans from the Treasury Department. He was recruited by the NSA for his computer skills, but his time working for them warped him and turned him into a cold ruthless anarchist.
- Adaptation Origin Connection: In the comics Brother Eye has no connection with Felicity Smoak.
- Adaptation Species Change: Brother Eye is a computer program in the comics. Here, it's a group of human hackers.
- Beauty Is Never Tarnished: Despite being killed by Darhk, he doesn't even look dead.
- Bomb-Throwing Anarchists: They appear to be this, but in reality they're just doing this for the money while causing as much chaos as possible.
- Break the Haughty: When Felicity re-encounters him, his time with the big league supervillains have left him a broken man.
- The Cracker: Turns off the entire city's power for a few minutes and threatens to wipe every cent off every Starling citizen's bank account with the push of a button.
- Create Your Own Villain: As it turns out, the Brother Eye group has a history with Felicity, which she inadvertently helped create. It was the virus that she wrote five years ago that ended up getting its leader, Cooper, sent to jail. As her boyfriend he took the blame to protect her, but then was recruited by the NSA where he was forced to do unspeakable things that warped him into a cynical, ruthless monster.
- 11th-Hour Ranger: Shows up as a rare villainous example to Damien Darhk's Five-Man Band near the end of Season 4.
- Evil Former Friend: Well, evil former ex-boyfriend, but basically the same thing.
- Evil Genius: So much that he gives Felicity a run for her money. He is later hired by Damien Darhk for this reason, serving as the HIVE's hacker.
- Faking the Dead: Cooper faked a hanging in prison because the NSA forced him to.
- Fallen Hero: It's a stretch to call him a hero back in his college days, but he did have some sentiment for doing the right thing, being a hacktivist. When he returns years later he has become a cyberterrorist with malicious intent.
- From Nobody to Nightmare: From harmless, well-meaning hacktivist to cold-blooded cyberterrorist.
- Heroic Sacrifice: He chooses to disarm Damien Darhk's nuclear missiles knowing that he would get executed for betraying him.
- I Have Your Wife: Brother Eye tricked Felicity's mother into coming to Starling in order to use her as a hostage to force Felicity to help them.
- Knight Templar: He claims his crusade was to teach the wealthy citizens the consequences of their corruption and greed.
- Mythology Gag: The trademark Brother Eye "eye symbol" appears on computer monitors to represent their organization.
- Named by the Adaptation: Since Brother Eye wasn't human in the comics, it had no human name.
- Non-Indicative Name: They're not members (Brothers) of the Blood Cult.
- Playful Hacker: Cooper used to be this, until he was arrested and recruited by the NSA.
- Pragmatic Adaptation: In keeping with the show's more grounded realism, Brother Eye is a group of hackers rather than a rogue AI.
- Redemption Equals Death: He helps Felicity disable the nuclear missiles targeting the world, but gets executed by Darhk for his betrayal.
- Sixth Ranger Traitor: He joined Darhk's team last, but he ultimately betrays them when Felicity convinces him to disarm Darhk's nuclear missiles heading for the city. It costs him his life.
- Start of Darkness: Cooper's attempt to eradicate student loans is the first step in his development into a member/leader of Brother Eye.
- Shout-Out: His name is very likely a shout out to Sheldon Cooper.
- Took a Level in Jerkass: His time spent with NSA caused him to see the world in a darker light. He also became even more bitter at feeling betrayed by Felicity, seeing she had become a corporate lapdog.
- Villain Team-Up: He joins up with Damien Darhk, the Big Bad of season 4.
- Well-Intentioned Extremist: Claims that turning off the power, and threatening to steal every cent of money in all of Starling's banks is to teach the citizens the price for their corruption and greed. Even during his MIT days, Cooper showed signs of this extremism when he tried to erase all of MIT's student loans from the Treasury Department to help out the students.
- You Have Failed Me: Darhk executes him for betraying HIVE to help Team Arrow.