You are looking at tropes for the unique characters and boss-monsters in DOOM and Doom Eternal. For tropes relating to the characters of the classic games, see Characters.Doom. For those found in Doom 3, see Characters.Doom 3.
The Doom Slayer
But you. You will be worse.
Rip and tear, until it is done."
A silent, unnamed Space Marine who awakens laying inside a stone sarcophagus on a UAC base on Mars that has literally gone to Hell. After acquiring a pistol from a zombie whose skull he just smashed in with his bare hands and a suit of Powered Armor from another nearby coffin, the marine proceeds to butcher his way through an army of demons to put an end to the madness.
While his background is never clearly stated, depending on who you ask, he could be either of two things: Some material suggests he's the Sole Survivor of the "Night Sentinels", an order of warriors from the now Hell-consumed world of Argent D'nur. Another interpretation is that he's the same Marine from the first Doom, Doom II and Doom 64, who ended up on Argent D'nur, and took up the Night Sentinels banner in his continuing war against Hell. Either way, he's been murdering his way through the legions of Doom for seemingly several eons, to the point that all of Hell now calls him "The Doom Slayer." As the demons were utterly unable to kill him, they instead sealed him away in the sarcophagus, before the UAC discovered him during an expedition into Hell.
- Action Hero: As with previous versions, the Doom Slayer is a straight-up balls-to-the-walls killing machine who slaughters his way through the forces of Hell without qualm or respite.
- And Show It to You: He's capable of tearing out hearts as part of his Glory Kills mechanic. The gore nests likewise require him to rip out their beating hearts in order to shut them down.
- Adorkable: The Doom Slayer's response to finding a tiny action figure recreation of himself? Give the little dude a fist-bump.
- Ambiguously Human: He has at least the outer appearance of a human, understands how to use human-made computer interfaces and weapons without any explanation, but also has strange runes etched on his hands, and doesn't flinch when exposed to demonic energy that turns most people into zombies. Further, it's ambiguous if his lost homeworld / latest battleground of Argent D'nur was an alien planet or an Alternate Universe Earth.
- Anti-Hero: While it's very clear that he has a preference for ripping through demon hordes with psychotic enthusiasm, as well as a penchant for violence little can match, he is still on our side for the right reasons.
- Ax-Crazy: The fact using his bare hands to kill demons is the easiest way to restore his "willpower", despite him having guns and blades that can do the job even faster, makes him come off as psychotically brutal. Especially when those kills involve doing things like tearing demons limb from limb, shoving his arms through their chests to rip out their hearts, or crushing their skulls between his palms, just to name a few.
- Are These Wires Important?: Doomguy's preferred method for dealing with Argent Energy equipment is to just start breaking things, despite Hayden's demands that he use utmost care.
- Barbarian Hero: A sci-fi version. He's a ridiculously muscular, rage-filled lone warrior of legendary skill and ferocity, who after losing his family/home has been wandering the wastelands of Hell taking bloody vengeance on his demonic enemies. By Eternal he's even lost the sleeves on his battle armor and picked up a magical Cool Sword.
- The Berserker: A quiet tranquility variation, when grabbing the Berserk sphere powerup, even without the powerup; he'll still intend to rip everything to shreds that are much bigger then him.
- BFG: Uses a number of guns that are as big as him, including the Chaingun, Gauss Canon, Ballista, and of course the BFG 9000.
- BFS: His Weapon of Choice from Argent D'nur is a giant Laser Blade greatsword.
- Blade Below the Shoulder: In Doom Eternal, the Doom Slayer sports an upgraded suit of armor with a retracting blade underslung on his left forearm, which he can use to stab and slash during his Glory Kills.
- Blood Knight: He's single-mindedly focused on murdering demons, and if the brutality of the Glory Kills are any indication, he likes fighting. Also emphasized in an interview with Doom 2016's Creative Director:Hugo Martin: Most people would avoid the gore nests because they start a fight. The Doomguy's looking for a fight.
- Broad Strokes: The "Slayer's Testament" implies he was involved in at least a version of the events of Doom, Doom II, and Doom 64, in something the demons refer to as the "first age". Whether it was actually him in those games, or he just had similar adventures, is never made clear though.
- Bruiser with a Soft Center: He treats the collectibles (which is in form of cute bobblehead like figure of Doomguy) with care.
- The Comically Serious: He's silent, incredibly angry and is unbelievably violent. But there is some humor from those aspects of him and what he does, from collecting Doom Guy Dolls, fist bumping one and in Eternal clearly having no care for personal space.
- Conflicting Loyalty: Hinted at in 2016; Codex entries refer to the "Wretched Betrayer", a Night Sentinel who stabbed his fellow warriors in the back and allowed Hell to invade Argent D'nur at the cost of returning the Betrayer's son who died in battle. They upheld their end of the bargain alright, only the son came back as the Icon of Sin. The demons speak of the Betrayer's retribution for their betrayal in the same manner of the Doom Slayer's Unstoppable Rage.
- Covered in Scars: What little we see of him in Doom (2016) without his armor is covered with lots of small scars.
- Determinator: Even in the face of armies of demons, of losing all his allies and his entire world, of being trapped alone in Hell for eons on end, of knowing his actions may potentially doom a civilization to a massive energy crisis, or even just being chained up completely naked to a slab with a zombie coming to eat his face off, he never gives up, and he never stops fighting.
- Did You Just Punch Out Cthulhu?: He's taken out demon lords as big as mountains, killed near-indestructible monsters, and faced down generations of the legions of Hell with little more than guns, blades and in many cases his bare hands.
- Doomed Hometown: Regardless of his origins: If we assume that Doomguy is a Night Sentinel, then he would be the last survivor of the planet Argent D'Nur, after it was conquered by demons and absorbed into Hell. If we assume he's the "classic" Doomguy, then the demons destroyed his Earth millenia ago. Naturally, he wants payback.
- Double Jump: His thruster boots upgrade lets him jump an additional time in the air.
- The Dreaded:
- In the 2016 reboot, all of Hell tried to keep him sealed away during their invasion of Mars for as long as possible, and they only managed to stop him the first time by dropping an entire temple right on top of him. When the UAC found his tomb, the demons began to freak out, fighting with "a desperate ferocity" that the UAC had never seen before. There's a reason he's generally referred to as the Doom Slayer (also Hell Walker, the Unchained Predator, Scourge of Hell).
- In Doom Eternal, the reaction of the UAC personnel who see him is to recoil in terror. One poor man who has the misfortune of possessing the key the Slayer needs can only lean back in his chair, petrified in fear, and doesn't move as the Slayer grabs the keycard, drags him by the strap to the door lock, and uses it to move on. In the next room, two UAC guards start to challenge the Slayer, but go completely silent as they realize who they're talking to, with the Slayer giving the mouthiest guard a Death Glare and taking the terrified man's weapon without a word. The base computer also has alarms specifically to warn of the Doom Slayer.Intercom: WARNING!!! The Slayer has entered the Facility!!!
Intercom: WARNING!!! Slayer threat level at [Maximum]!!!
- Empowered Badass Normal: The Doom Slayer collects assorted scientific and magical tokens to power himself up; argent energy cells to enhance his armor's basic capabilities, special Praetor enhancement tokens to upgrade various utility functions and equipment traits, and demonic runes to magically augment his capabilities; he's also been empowered by angels with enough strength and speed to go One-Man Army on Hell, though records indicate that he was already kicking huge amounts of ass by the time they did.
- Establishing Character Moment: In Doom 2016, he wakes up naked and chained to a slab, after Hell's forces sealed him in a coffin and dropped an entire temple on top of him just to be safe. The instant he's awake and aware, he rips out the chains, smashes a zombie's head to paste with his bare hands, and blasts two others to pieces with a pistol. The moment that Samuel Hayden tries to justify what's happened to the base by saying that his actions were for "the betterment of all mankind", Doomguy's response is to smash the monitor Hayden's speaking on.
- Eternal Hero: Whether all the legends you can read in the Encyclopedia Exposita are about your player character, or you're just the latest in their line, it seems someone will always rise to swear another eternal Roaring Rampage of Revenge against the forces of Hell.
- Face Death with Dignity: A comedic version. His response to burning alive in lava is to give the thumbs up before sinking fully into molten slag.
- Featureless Protagonist: You never get a good idea of what his face looks like. However, you can kind of see his facial features through the helmet's visor, and he does have a face texture, which some fans were able to rip.
- Finishing Move: In Doom 2016, the Doom Slayer can do these to demons, something borrowed from the popular Brutal Doom mod. It's actually encouraged to do this, as enemies finished off with a "Glory Kill" are guaranteed to drop health pickups (and armor fragments, with a rune), and Glory Kills are the only way to finish off bosses.
- Godzilla Threshold:
- Is the proverbial Godzilla for Samuel Hayden in Doom (2016), as waking him from his can leads him to destroying everything related or even concerning Hell, including the extremely powerful Argent energy that the company had been exploiting Hell for.
- Invoked by the staff at the Phobos facility in Eternal, if the gameplay demos are any indication. As the Doom Slayer rides an elevator down into the sublevels of the facility (which has just been stated as having been overrun by demons), the base's AI system has a special announcement stating that "the Doom Slayer has entered the facility". A guard even attempts to impede his progress just prior to this, only to shrink back as the Doom Slayer plucks the Plasma Rifle from his hands, reloads it and wordlessly walks to a nearby elevator.
- Good Is Not Nice: Clearly on humanity's side (mostly because it's in opposition to the demons), but due to a combination of dealing with people who screwed things up and being too deep into everlasting fury to care, the Doom Slayer is rude as hell. He refuses to listen to people, his only forms of communication are Death Glares and violence, and if you have something he wants he'll just take it without asking even if you need it or you're wearing it.
- Good Colors, Evil Colors: His armor is a mix of earthy greens, greys and browns, compared to the demons' predominately red and yellow bodies that evoke fire and blood.
- Grappling-Hook Pistol: In Doom Eternal, the Doom Slayer's Super Shotgun is now equipped with an underslung grapnel attachment that he can use to snag onto enemies from a distance and pull himself closer to them. It's called "The Meat Hook".
- Guest Fighter: The Doom Slayer makes a playable appearance in Quake Champions, with alternative textures allowing you to make him look like his classic incarnation, or the Marine from Doom 3.
- Heroes Prefer Swords: His Weapon of Choice from Argent D'Nur, the Crucible, is a massive Laser Blade greatsword.
- Heroic Comedic Sociopath: The majority of his violent or thoughtless actions are played for laughs rather than any kind of drama: He murders demons in various ridiculous and inventive ways, usually just goes for "smash it in with your hands and feet" when dealing with UAC equipment, drags around technicians by the keycards attached to their necks or just slings their half eaten corpse over his back if they're already dead, and gleefully steals weapons from random corpses and even living guards.
- Heroic Mime: As usual, he never speaks. His actions tend to speak louder then words, though.
- Heroic Second Wind: His extra lives mechanic in Eternal is described In-Universe as such: Even after nearly being killed by a pack of demons, the Doomguy's forcing himself back up with pure anger and willpower to keep fighting.
- He Who Fights Monsters: Given he's running around in a suit of armor that feeds on Argent Energy, the same Hellish power that the UAC used to create its Possessed and Revenants, it's pretty clear that the Doom Slayer has actually become a demonic entity himself!Slayer's Testament: Burned by the embers of Armageddon, his soul blistered by the fires of Hell and tainted beyond ascension, he chose the path of perpetual torment.
- Hidden Depths: In the 2016 Doom at any rate, especially considering he never says a word. While he's still a rampaging berserker he show surprising depths at times. For instance he's obviously disgusted with Hayden's callousness toward the loss of life he's ultimately caused, yet still doesn't make any attempt on the man's life when they meet in person (though you can try to shoot him, Hayden has a Plot Armor energy shield). He also hesitates to destroy VEGA, a fully sentient A.I., even though he knows it's necessary, and even ultimately makes a backup first.
- He's also surprisingly adept with technology (when he's not intentionally destroying it), given how long he may of been fighting in Hell. He only ever hesitates on his options for VEGA, and otherwise seems to speed through numerous options and activation with no real difficulty. Even on Olivia's personal and top-secret computers, he doesn't waste a second on any single option each as he picks through them to unlock what he needs. The interfaces may be user-friendly, but he clearly knows what he's doing.
- Horrifying the Horror: Really driven home in Doom 2016, where various data pads (on Mars) and artifacts (in Hell) make it clear just how terrible the Doom Slayer is for the denizens of Hell. It was said that the demons fought with unprecedented ferocity to prevent the UAC from retrieving the Doom Slayer's sarcophagus.
- Humanoid Abomination: The Doom Slayer begins the game with strange runes etched on him, and he doesn't flinch when exposed to demonic energy for the sake of a buff.
- Humanoid Alien: In the 2016 series, one interpretation of the Doom Slayer's backstory is he's a native from a Hell-consumed alien world called Argent D'nur. Despite this, he looks no different from a human.
- Hyperspace Arsenal: In typical Doom fashion, he can carry multiple weapons on him at once.
- At one point of the campaign, the he stuffs an entire upper torso in his inventory to bypass a retinal scanner.
- I Have Many Names: He's acquired quite a few monikers from demons and humans alike, including the Doom Slayer, the DOOM Marine, DM1-5, the Hell Walker, the Unchained Predator, and the Scourge of Hell.
- Incorruptible Pure Pureness: A very dark version. He's not corrupted by the influence of Hell, which turns most people into demon worshipers or monsters, because there's nothing left in him but pure vengeance.Testament: Tempered by the fires of Hell, his iron will remained steadfast through the passage that preys upon the weak. For he alone was the Hell Walker, the Unchained Predator, who sought retribution in all quarters, dark and light, fire and ice, in the beginning and the end.
- It's Personal: Even if he's not the classic Doomguy, the demons still corrupted and slaughtered his comrades in the demon killing order of warriors, the Night Sentinels, and then destroyed his homeworld.
- Jerkass: Being a person of unstoppable rage doesnt exactly give you good social skills. Through the games he has proven himself to be violent, gruff, disrespectful, and all around not a nice man to be around.
- Jerkass Has a Point: Comes off as a more clear-cut Well-Intentioned Extremist than Hayden, as Doom Eternal reveals that plunging humanity into an energy crisis was actually the much better option.
- Jerk with a Heart of Gold: That said, he still cares greatly for the humans lives lost, and hes trying his best to ensure humanitys survival.
- Knight In Sour Armor: One interpretation of his behavior in Doom (2016); he may not be the most calm or peaceful person around, but he still fights for what he believes in and against Hell. His unbridled rage at the UAC in 2016 shows a cynical and bitter side, and yet his team up with Hayden also shows he'll put it aside on a whim for the greater good of stopping Hell again.
- Legendary in the Sequel: Has apparently risen to this in Doom (2016), being The Dreaded to the forces of Hell and demanding their full attention to stop him from halting their invasion.
- Lightning Bruiser: He's capable of outrunning virtually every demon and delivering punishing firepower, but in return, he needs to stay on the move constantly in order to survive, to the point the developers have stated "if you stand still, you're going to die".
- Living Legend: He's basically become to the Demons what they are to us, being feared in-story and having all the forces of hell either wary or outright shitting themselves at the very least.
- Multiple-Choice Past: The codex entries in Doom 2016 give few concrete facts about the Doom Slayer's origins, but plenty of Wild Mass Guessing fuel. Several references to the classic series enforce the fan theory that he's the Doomguy from 1/2/64. However, there's also hints that the Doom Slayer was the last surviving member of the Night Sentinels, protecting the dimension that Hell completely subsumed. Despite this, theories also abound to connect both possibilities. Finally, there's an additional story about a traitor that facilitated Hell's conquest of Argent D'nur, described as going on a Roaring Rampage of Revenge of their own after being Rewarded as a Traitor Deserves. Debate ensues as to whether the Doom Slayer was the same traitor, or whether the betrayer is a Hero of Another Story, and how it fits in with the "Doom Slayer is Doomguy" theory.
- Names to Run Away from Really Fast: In the 2016 reboot, the demons, who call their forces "the slaves of Doom", have a name for him too: The Doom Slayer.
- No Sense of Personal Space: In Eternal rather than asking for UAC employees to hand over a keycard or a plasma rifle, the Doom Slayer drags the terrified worker over to the card input with it still around his neck, and just snatches the rifle out of a soldier's hands.
- Nonstandard Character Design: Despite the Slayer's Testament claiming "he wore the crown of the Night Sentinels", his armor looks utterly different from any other Night Sentinel you meet, even in scrolls depicting him fighting side by side with them. While they look closer to sci-fi versions of medieval knights in white armor, Doomguy's suit looks closer to an Earth designed one reforged with Hell touches, and it's colored with nothing but greens, browns and greys instead.
- Older Than They Look: Despite having the appearance of a man in the prime of his life, the Slayer's Testament claims "The age of his reckoning was uncounted" and "The scribes carved his name deep in the tablets of Hell across eons."
- Omnicidal Maniac: His adopted policy for demons is to murder all of them, violently, thanks to the repeated antics of the forces of Hell.Samuel Hayden: You see, I've watched you work - come to understand your motivation. You think the only way is to kill them all - leave nothing behind - and you may be right.
- Only Sane Man: It's quite clear he does not buy a single syllable of the shaky self-satisfied Well-Intentioned Extremist malarkey the UAC keeps feeding him, because said malarkey is also what keeps on provoking demonic invasions. To him, there's exactly three things in the world: Kill demons, save the world, and do it as efficiently as possible.
- Offscreen Moment of Awesome: During his rampage of Hell, as explained in Doom (2016), he fought a massive demon called the Titan, Hell's greatest champion, and now its massive skeleton litters the aptly named Titan's Realm region of Hell.
- Perpetual Frowner: Though he has a Face Framed in Shadow and Hidden Eyes to emphasize ambiguity and a potential Audience Surrogate, what little can be seen of his face (especially once fans extracted it from the model) is a perpetual frowning grimace of sorts. It works surprisingly well with his Knight In Sour Armor status and disgust for the forces of Hell.
- Person of Mass Destruction: In Doom (2016), the UAC's final failsafe in the case of a demonic invasion is not to nuke their facility, but to let the Doomguy out of his coffin.
- Pet the Dog:
- When Samuel Hayden tries to justify his actions in creating the mess over the intercom, the Doom Marine's response is to look down at the corpse of one of the victims, crack his knuckles, and smash the intercom in disgust.
- When it becomes necessary to sacrifice VEGA, the Doom Slayer hesitates for a moment and makes a back-up of the AI (which he then keeps with him) before pushing the button.
- Powered Armor: His Praetor Suit, which was built/enhanced by a rogue demon to feed off the power of Hell itself. On a more mundane level, it keeps track of his current vitals, provides a Heads-Up Display that feeds various info to the Doomguy, has a Comm Link system, and can integrate with external technology like VEGA or the Delta V Jump-Boots.
- Real Men Wear Pink: He can search all over the place for his ever expanding doll collection. Of course, all the dolls are of himself, so that could just be narcissism at work rather than any actual love of dolls.
- Reconstruction: Of the Space Marine trope. Anyone who managed to become a One-Man Army who tore through The Legions of Hell with an unexplained Hyperspace Arsenal of guns wouldn't just be considered some random Mook for long. From the start of Doom (2016), the player character is already Legendary in the Sequel, Shrouded in Myth, and considered to be The Scourge of God to the demons. In other words, he's become to them what Hell is for humanity.
- Red Baron: The demons refer to him as "the Doom Slayer".
- Roaring Rampage of Revenge: He really goes apeshit on the demonic forces for destroying the realm of Argent D'Nur, and goes on such a ground-shattering vengeful rampage that it makes the collective forces of Hell piss themselves in fear, and only ends when they manage by luck on their part to seal him away. And that only bought them time.
- Depending on your perspective of the 2016 codex entries, he may also be the "Wretched Betrayer" who sold out his fellow Night Sentinels because Hell promised to return his son who had perished on the battlefield. Only when they did return him, they did so in their image (heavily implied to be the Icon of Sin). This naturally pissed him right off.
- The Scourge of God: In the 2016 reboot continuity, the Doom Slayer is a vicious and unstoppable killing machine, but he only aims his violent rampage against the wicked demons of Hell, who are utterly terrified of him and openly consider him this trope. One Slayer's Testament says that he got his Super Strength from "seraphim", implying that he may have literally been given his mission by God.
- Screw the Rules, I'm Doing What's Right!: The Doom Slayer does not care what the Hell you want the demons for. Doomguy wants them all dead because no one can control demons, end of story.
- Sealed Good in a Can: Started off as this before Doom (2016), and the opening is literally him breaking out from his can. Hayden then Book-Ends the game by sending the Slayer somewhere (no doubt with the ability to recall him, should things to south again) via the Tether system.
- Shoulder Cannon: The Doom Slayer's upgraded Praetor armor in Doom Eternal now sports a smaller gun mounted on the left shoulder, which features grenade launcher and flamethrower functions.
- Silent Snarker: Portrayed as such in the 2016 remake, visibly having no patience for Samuel Hayden's tendencies to exploit hell for resources and For Science!!
- Sleeves Are for Wimps: By the events of Doom Eternal, the bicep armor on his Praetor suit has been removed, revealing his gigantic muscles.
- Sole Survivor: Regardless if he's from an Alternate Universe Earth of Argent D'nur originally, Doomguy is this Up to Eleven: he didn't just lose the entire demon-fighting order he fought with, his entire homeworld was destroyed by Hell, leaving him seemingly the only one left.
- Space Marine: Despite his Mysterious Past, his pressurized Powered Armor and records of his campaigns across the plains of Hell got him the moniker "the DOOM Marine" from the UAC researchers who studied him.
- Super Strength: He's strong enough to liquefy a zombified human's skull with just one hand while shackled to a table, rip off the limbs of bullet resistant demons, and tear apart pieces of metal equipment and armor with just his hands and feet.
- To Hell and Back: In Doom 2016, he goes to Hell and back twice that the player can see, and is said to have done it at least once before, which is how he became so damn scary to the demons.
- Teeth-Clenched Teamwork: In the 2016 reboot, it's clear that the Doom Slayer does not trust Samuel Hayden. But he's forced to work with him to stop the demonic invasion. Hayden likewise doesn't appreciate the Slayer's somewhat permanent approach to shutting down operations, but admits that the Slayer is possibly the only person who can stop them.
- Terror Hero: By the events of Doom Eternal, his mere presence can scare even ordinary humans and get them to keep their distance. He is sufficiently intimidating that he can even confiscate a UAC guard's plasma rifle with little more than a token protest that quickly stops when he delivers a Death Glare at the poor guy.
- Time Abyss: The Slayer's Testament claims that no one even knows how long he's been hunting the forces of Hell, but his name is etched across the demons' history for eons.
- Tranquil Fury: He never cries out in rage, not even once. But his mannerisms and the fact that he dispatches every demon, monster or zombie that gets in his way brutally and without a shred of mercy indicates that he is very, very angry, and considering what he's been through, who can blame him?
- Unscrupulous Hero: He is extremely violent and committed to his goals above all else, but his reactions to dead civilians and his treatment of VEGA indicate his moral compass is quite functional.
- Unstoppable Rage: He is the Sole Survivor of his realm, and considering how he utterly brutalises any demon or possessed that get in his way as well as his lengthy rampage before he was sealed away, one could agree that the experience has left him with... anger issues. Eternal even makes it a gameplay mechanic, with extra lives being him getting so angry he literally refuses to die.
- Weapon of Choice: If both covers of the 2016 game are anything to go by, the Doom Slayer prefers the Super Shotgun.
- Well-Intentioned Extremist: The Doom Slayer will stop at nothing to stop the forces of Hell from consuming another world, even if it means undoing any good the UAC could have done with Argent Energy. Earth is stated to be suffering from a serious energy crisis, but the Slayer doesn't care, or doesn't think the UAC can keep the evil in its can forever.
- The Extremist Was Right: Given the situation at the UAC when he first woke up, what sort of stuff it was up to before that point, a personal history of watching demons break loose and literally raise Hell if allowed, and that Argent Energy itself appears to have a Healing Factor effect on said demons, it's really, really hard to disagree with him on this one.
- Would Not Shoot a Civilian: In the 2016 game, the UAC's casual dismissal of their civilian casualties has him visibly trembling with rage. Eternal shows him walking through a UAC base on Phobos with living humans panicking over the invasion (and over him) and doesn't hurt a hair on any of their heads even if he's more than a little disrespectful with them.
Dr. Samuel Hayden is the leader of the UAC and the official who oversaw the Argent energy research projects at the UAC Mars Base. After an unknown incident during construction of the facility's Argent Tower which caused him to develop brain cancer, he was forced to replace almost the entirety of his body with cybernetics.
Hayden is adamant in defending his original research projects into Hell and its Argent energy reserves, stating that it was all in mankind's best interest, and that the sacrifices made would have been worth the cost, if his other staff had been able to resist the corrupting influences of the demonic dimension. While he seems friendly, whether or not he can be trusted must be regarded as a question.
- Affably Evil: He's unfailingly polite to the Doom Slayer, even when the guy destroys irreplaceable technology that Hayden himself made. Even if the Doom Slayer tries to shoot him (and Hayden's energy shield will absorb it), he just calmly tells him to save his ammunition.
- Authority Equals Asskicking: Leader of the UAC and doubtlessly its strongest fighter, thanks to his cybernetic body. He's the only person other than the Doom Slayer to survive going to Hell and back.
- Badass Baritone: His deep voice has drawn more than a few comparisons to Peter Cullen's take on Optimus Prime.
- Bad Boss: It's not clear how much of the policies (seven days of work and letting yourself killed by demons in ways they can get better data from it) are his doing, but he is rather cavalier about their deaths, admitting he takes responsibility for it but no remorse.
- Brain Uploading: After being diagnosed with cancer, he had his frontal and temporal lobes transferred into a cybernetic body, retaining his personality, memories, reasoning, and comprehension.
- Cyber Cyclops: Sports a single, thin eye. Makes it easy to forget that he's a cyborg and not a fully-fledged robot.
- Cyborg: His body houses non-cancer infected parts of his brain, but the calculative parts are replaced with machinery this, in effect, means that while his personality is the same as before his brain was put into the nine-foot body, he now has the mental acuity of a supercomputer and the strength to be expected by a 3-meter tall machine.
- Deadpan Snarker: Upon telling the Doom Slayer to head towards the research complex to retrieve The Helix Stone, he drops this line:Samuel: Your affinity for guns is apparent... I'm confident you'll find something useful there as well.
- Deflector Shields: His cyborg chassis has energy shields that prevents Doomguy from simply shooting him on sight.
- Does Not Like Guns: Subtly implied. Hayden never uses guns himself, even when journeying into Hell, and emphasizes the word "guns" when talking to Doomguy as if it's beneath him even to speak the word.
- Emergency Transformation: Upon being diagnosed with brain cancer, Hayden transferred his consciousness into an argent-powered robot body. The new Hayden is even more impressive a mind than he was when mortal.
- Four-Fingered Hands: His new body was built with only 8 digits.
- Godzilla Threshold: Waking up the Doomguy. Hayden is well aware the Doomguy would wreak just as much devastation on the UAC's property as the demons but wakes him up anyway because, at the end of the day, the destruction of UAC property beats Hell conquering Mars and Earth, and Hayden knows it.
- Insufferable Genius: He has a very high opinion of his intellect and believes he can harness the powers of hell but from what we of "Eternal" he was dead wrong.
- Large and in Charge: His body was specifically built to be 3 meters tall, and he leads the UAC.
- Meaningful Name: Samuel Hayden > S. Hayden > Satan
- Ironic Name: But he is strongly opposed to letting the demons conquer our world, even as he draws from theirs to stop an energy crisis.
- Mission Control: He's the one who gives the Doomguy directions on what to do, though Doomguy's willingness to actually follow through on said directions varies.
- Morally Ambiguous Doctorate: Isn't a full-on cultist like Olivia, but still very interested in exploiting Hell's resources. And while his conflict with Olivia is obvious, one has to wonder if and how much of the UAC Mars branch's cult behavior and development of "battle demons" were allowed to proceed with his knowledge and/or blessing.
- Nigh Invulnerable: The only other human besides the Doomslayer to make it back from hell and without gun to defend himself. Being a cyborg with an energy shield not much could scratch him.
- No-Sell: Go on, try shooting him when you meet him in person. He'll scoff that you're wasting ammunition as his energy shields negate the shots.
- Pet the Dog: He is willing to sacrifice all of his employees to solve the energy crisis on Earth but seems to respect their sacrifices, as shown when he thanks Vega after the latter pull a Heroic Sacrifice.
- Really 700 Years Old: Thanks to his Argent-powered cybernetic body, he's practically immortal. He's over 130 years old by the events of the game.
- Teeth-Clenched Teamwork: With the Doom Slayer. Samuel would really rather that the Doom Slayer didn't destroy all the machinery that extracts energy from hell, which clashes with the Doom Slayer's view of 'Rip and tear everything and everyone related to hell'.
- Well-Intentioned Extremist:
Samuel: I do what I do because there is no choice.
- Samuel believes that mining Hell for its resources is a fantastic idea, and considering the alternative is an energy crisis that humanity has no answer for, he may have a point. Hayden represents the rare literal case where the road to Hell is paved with good intentions.
- Unwitting Instigator of Doom: In the most literal sense in Doom Eternal. Despite being completely aware of the risks his insistence on continuing the UAC's experiments with the Crucible and Argent energy ends up causing Hell on Earth.
- Utopia Justifies the Means: Debated. He spends the whole game justifying the use of Argent energy, despite its hellish origins, because it's a solution to humanity's energy crisis. By the end, he concedes that the Doom Slayer might be right about destroying all of Hell. But "having an unsolvable energy crisis" is not an alternative, so he turns on the Doom Slayer at the end. It all proves to be a big mistake come Doom Eternal.
- Villain Respect: Well, not exactly villainous, but he agrees on the Doom Slayer's methods of dealing with The Legions of Hell, saying he may be right in killing them all.
- You Have Outlived Your Usefulness: As soon the Doom Slayer defeats the Spider Mastermind, Samuel takes the Crucible and sends the Doom Slayer to parts unknown.
- Also subverted: Samuel knows he'll need the Doom Slayer if another demonic invasion happens, so he just exiles him (so he won't interfere with Samuel's research) instead of killing him.
Dr. Olivia Pierce is a high-ranking adherent and researcher in the UAC, and has taken practical control of the UAC Mars Base by causing a Hell Wave of Argent energy while releasing all of the captive demons in the Lazarus Labs, zombifying 64% of the staff and killing the rest. She is a major antagonist of the game, and opposes Dr. Samuel Hayden, whose claimed interests are only in Hell's Argent energy, by trying to bargain with the demons and open a permanent portal to Hell.
Olivia was formerly an ordinary woman, as demonstrated by a picture of her prior appearance which can be found in the Advanced Research Complex on an array of monitors displaying high-ranking UAC researchers. However, her long-term exposure to Hell deteriorated her physical body as it had Samuel's, causing her to develop debilitating scoliosis. In an attempt to remedy this and maintain mobility, she had herself integrated into an artificial exoskeleton. While this worked, the exoskeleton keeps her in a constant state of pain and torment, which, in her ever-increasing fanatic dedication to Hell studies, she refuses to remedy through medication, lest her mind be dulled in any way.
- A God Am I: Her plan was to open a portal to Hell and offer up humanity as a sacrifice to the demons, after which the Lords of Hell would reward her by turning her into a god.
- Be Careful What You Wish For: Turns out, making deals with the literal hell is likely to give you exactly what you bargained for: You'll get 'power beyond comprehension' alright, but it's by transforming into the Spider Mastermind, a massive brain-shaped creature with an arachnid-like mechanical chassis, an Argent plasma gun, and immense telekinetic powers.
- And even if the transformation was part of the bargain a codex entry heavily implies that she's merely acting as the host body for the Mastermind. When you ask for the power of a god, make sure to specify that you'll be the one in control.
- Big Bad: Causes the events of the game. Becomes the final boss, the Spider Mastermind.
- Cyborg: Her scoliosis required her to turn to cybernetics to maintain her ability to walk. One that keeps her in constant pain.
- Deal with the Devil: Makes an agreement with the Demonic forces to help them invade Mars in exchange for godlike power. Be Careful What You Wish For, you might just get it.
- Determinator: Whatever you have to say about her, she's an unarmed, incredibly sick woman, who breaks open the gates to Hell in order to make the demons live up to their side of the bargain.
- Evil Cripple: Has a severe neurological disorder which forces her to wear an exoskeleton in order to walk; she refuses pain medication because she feels it dulls her mind.
- Evil Is Petty: Honestly, her goodbye note for her followers is pretty much an eloquent version of So Long, Suckers!.
- Evil Makes You Ugly: After triggering the portal to hell with an Argent reactor, the glimpse we see of her right before she turns into the Spider Mastermind is already a bit zombified.
- Expy: She is one to Malcolm Betruger.
- Gamer Chick: She has the second highest score on the UAC leaderboards for Demon Destruction.
- Hoist by Their Own Petard: She gets a few of these.
- It's All About Me: Her final message in the Codex to her subordinates is that they are all going to die solely for the benefit of her, and that they should be glad for it.
- Karmic Death: After selling humanity out in the name of personal power from her demonic overlords, shes betrayed by them and twisted into the Spider Mastermind, before finally becoming the last victim of the Doom Slayers vengeful rampage.
- Kick the Dog: When she meets the Doom Slayer face to face (with a bullet-proof window between them) at the Foundry after overloading the Argent Tower she tells him matter-of-factly that he could not have saved them anyway. Whether she's referring to the all the dead personnel in the UAC Mars Facility or his people back on Argent D'Nur is up to interpretation, but what she says is horrible either way.
- Leitmotif: "Authorization: Olivia Pierce", which is a remix of "Suspense".
- Morally Ambiguous Doctorate: Before joining the UAC she was an accomplished and perfectly sane Bioengineer and Geneticist, but then Hayden, in trying to convince her to join his company, showed her an artifact that created her obsession with Hell, and she turned the UAC into a cult as a direct result.
- Not-So-Well-Intentioned Extremist: She preaches to anyone in the cult she's set up and to anyone who would listen to her that the forces of Hell would allow mankind to advance and evolve. However her codex entry privately discloses that she was either so far gone or merely blowing hot air to make the masses more pliable to do her bidding and reveals this as a ruse, with her actual goal being to procure godlike power for herself, with her last entry to her followers essentially being a cruel screw-you about how they'll suffer in eternal torment, completely forgotten, while she ascends to godhood.
- Oh, Crap!: When you make it to her office in the Lazarus Complex, an Echo flashback shows her being confronted by a mysterious demonic voice for letting the Doom Slayer be found and released. For the only time in the game, Olivia is terrified and attempting to placate the voice by saying Hayden did that and she'll still uphold her end of their deal.
- And at the very beginning of the game, in the hologram recording around the Doom Slayer's coffin. She keeps her composure, but clearly realizes that if what's inside wakes up, she's completely hosed.
- Path of Inspiration: She's turned the UAC from an energy company into a hellish cult with lies and promises of rewards.
- Rewarded as a Traitor Deserves: She defects from the UAC to the The Legions of Hell, either having been drawn in by their promises of power or the thought that they could help humanitys evolution only to suffer Sanity Slippage from The Corruption, and in the end, they rewarded her by transforming her into a mechanical, big-brained monstrosity and leaving her to die after she fails to kill the Doom Slayer.
- The Sociopath: While its unclear whether she was this from the beginning or the after-effects from her Deal with the Devil, she ultimately reveals herself to be a cold, cruel, selfish, calculating woman who summons up a cult to help her achieve godhood in the name of advancing mankinds evolution and ultimately leaves them to perish after their usefulness is used up while leaving behind a note sadistically informing them of their impending fate For the Evulz.
- Straight Edge Evil: Would rather live in pain than risk medication that would slow her mind.
- Smug Snake: Although she managed to unleash the demons upon the UAC station , its painfully obvious despite her best attempts to pass off her shady activities as scientific work that her superiors knew exactly what she was planning, and excavated the Doom Slayers sarcophagus as a countermeasure should she go through with it. She also sincerely thought that her demonic benefactors wouldnt double cross her the first chance they got, but by the end of the game, youll find out for yourself how that goes.
- Ungrateful Bitch: Her final message to her followers is basically her smugly and verbally flipping them off and selling them out to die while she goes on to become a goddess.
VEGA is an artificial intelligence which is responsible for the operation of the UAC Mars Base. It is capable of analyzing the Praetor suit and enabling some of its latent functionality, resulting in advancements in combat capability and maneuverability.
- Artificial Intelligence: VEGA is the Master Computer that runs the Mars facility. In-universe, it was put to the Turing Test alongside a supposed professor from MIT; the results were that only 8% of the participants realized that VEGA was the machine. VEGA successfully fooled the remaining 92% into believing the whole test was a prank and that both subjects were human. Unbeknownst to the participants, however, the professor was also played by VEGA.
- Benevolent A.I.: Not only does VEGA — a sentient AI powered by Hellish energy, and the brain of the UAC facility-turned-Hell-cult — completely fail to go rogue and try to stop you, he remains calmly cooperative throughout the process of walking you through killing him.
- Big Brother Is Watching: Supposedly, VEGA monitors everything going on at the UAC, barring some top-level research.
- Do Androids Dream?: Right before VEGA is about to overheat, just as the Doom Slayer makes a backup, VEGA tells Samuel Hayden that 'he is scared' of what is essentially dying. This is the first time he shows anything resembling conflicting opinions.
- Heroic Sacrifice: Allows the Doom Slayer to destroy him in order to open a portal to The Well so that he can shut it down.
- I Cannot Self-Terminate: Which makes sense: He's just an AI with no limbs or otherwise physical means of destroying his own neural processors, or blowing up his cooling tanks. Even so, he dutifully directs the Doom Slayer to do these things full well knowing that they will lead to his death.
- I Regret Nothing: Subverted. Right before he completely melts down, he says "I have many regrets", presumably for playing a part in the UAC's monstrous activities.
- Not Quite Dead: The Doom Slayer makes a backup of him before going through with destroying him, which as far as we know is still on his person.
- The Smart Guy: VEGA comes up with all the ways you improve your suit and weapons.
- Token Good Teammate: To the UAC. Samuel Hayden is a Well-Intentioned Extremist who was willing to sacrifice everything (including his own employees) for "the betterment of mankind", and Olivia Pierce turned out to be a Not-So-Well-Intentioned Extremist whose sole drive was to obtain god like power. VEGA, on the other hand, is thoroughly polite and patient with the Doom Marine and performs a Heroic Sacrifice to stop Olivia (albeit with the Doom Marine's help).
The 2016 game's version of Zombies and Zombie Marines, Possessed refers to both the randomly resurrected former staff members of the UAC created when Hell broke loose and to UAC Marines who volunteered to be subjected to Argent Energy exposure experiments, during which they were ritually slain and surgically enhanced before being revived as part of the Lazarus Wave treatment. The Possessed Marines and Security are cybernetically enhanced undead soldiers who proceeded to defect to the side of Hell when the demons broke loose. They are the 2016 equivalent of Zombie Marines and Z-Sec. This also covers the Unwilling, which are ancient, alien zombies who have been transformed over centuries in Hell into lesser demons.
- Action Bomb: Possessed Engineers have an explosive cylinder lodged in their torso, which they'll detonate if you get too close to them.
- All There in the Manual: The fact that the Possessed were deliberately created by the UAC before the demonic invasion is covered in "The UAC Handbook", a small flavor-text manual that comes bundled with the physical copies of DOOM.
- Arm Cannon: Their guns are cybernetically meshed into their arms.
- Attack Reflector: Shotgun-wielding Possessed come with energy shields that will deflect your bullets back at you if you shoot them. Fortunately, they have no effect on plasma bolts or explosives.
- Body Horror: The Argent Energy that brought them back really did a number on them. To count a few examples, their skin is overgrown and seems to consume anything in contact with it, which leads to them getting things like explosive cylinders, bits of clothing, guns and even armor growing into their body itself. Possessed Scientists have a single eye on their forehead, but a look closer reveals that it isn't an eye and merely an opening that gives you a little peephole to see into their skull, which is completely hollow.
- Cyclops: Some of the possessed only have a single large eye-like cavity on their head.
- Came Back Wrong: Long story short: Good news, Argent Energy allows you to come back from the dead. Bad news, you are now the furthest thing from human that you can possibly go.
- Everything's Deader with Zombies: They're either the partially demonic remnants of cultures defeated and assimilated by Hell over eons, former UAC staff killed and then resurrected by Argent Energy, or former UAC marines murdered by their superiors before being equipped with guns, ammo and armor cybernetically meshed into their frames and then resurrected by experiments with hellish energies. It depends on the precise variants; the Unwilling are the ancient zombies, the standard Possessed & Possessed Engineers, are former UAC staff, and the Possessed Marines & Security were experiments by the UAC.
- The Goomba: Your standard Possessed are the weakest enemies by a decent margin, being slow, fairly stupid, fragile, and none too damaging. Borders on Piñata Enemy, as you seem to encounter gangs of unprotected Possessed fairly often, which can then be effortlessly Glory Killed for easy health.
- Hitscan: Shotgun-wielding Possessed have this trait.
- Humanoid Abomination: Former human beings that were exposed to demonic energy, transforming them into deformed feral monstrosities that don't look anything like their former selves.
- Human Sacrifice: Supposedly, the Soldiers/Security members volunteered for it, but still.
- It Can Think: The Possessed formed out of former military soldiers or guards are fully cognizant and calculating, allowing them to use tactics as well as any living soldier. The UAC Handbook outright brags about their ability to think fast on their feet, and they overall move, act and think much more humanlike than the Possessed. One of the credit scenes is a good example, showing a Possessed Soldier vaulting a rail as a Possessed mindlessly shambles around in the background. The Unwilling don't seem to be as intelligent, but it's implied that some may have regained their humanity to some extent and fought back against the demons in Hell.
- Possessed Soldiers and Security occasionally say something that is clearly not just roaring and growling, in a deep, distorted voice. Some of their voice lines seem to actually be barely-legible English, confirming that they are sentient.
- Man Bites Man: If the basic Possessed or the Unwilling kill the Doom Slayer, you get a scene of them ripping out his throat with their teeth.
- Shield-Bearing Mook: Possessed Security, a variant of Possessed Soldier carrying a Hard Light tower shield and a Short-Range Shotgun.
- Shotguns Are Just Better: The Shotgun-wielding Possessed Security is one of the few enemies in the 2016 game with a hitscan attack, making them surprisingly dangerous, especially combined with their bullet-repelling shield.
- Super Soldier: The UAC experimented thoroughly with the undead created from humans slain by lazarus wave radiation, hoping to find scientific/military applications. The discovery that Possessed Soldiers retained their combat skills is what directly led to the Revenant project.
- Took a Level in Badass: Possessed Marines are much nastier than their Z-Sec and Zombie Marine counterparts; they sport highly accurate plasma rifles or shotgun-energy shield combos, move quickly and with great agility, and can absorb a surprising amount of firepower before they fall.
- Turned Against Their Masters: Unfortunately for the UAC, the Possessed Soldiers fell in with the demons when Hell broke loose on Mars.
- Underground Monkey: In addition to the Possessed, there's also the Unwilling, enslaved zombies that are the remnants of civilizations conquered and absorbed by The Legions of Hell.
- Zombie Gait: The basic Possessed, Engineers, and Unwilling all shamble at a decent rate of speed. Possessed Marines and Security are more mobile.
One of the most common demonic enemies you fight, the 2016 version of the imp looks and acts similarly to their older counterparts...with a few refinements.
- Death from Above: They like to cling to walls or ceilings and then pelt you with fireballs.
- Fatality: If they defeat the Doom Slayer, they knock him to the ground and then scurry over. Before he can recover, they turn him over, disembowel him with their claws, rip off his left arm and then brutally smash him in the face with it.
- The Goomba: Despite their upgrades, they remain relatively common and easy to take down.
- Mooks: Just like in the original game, they are commonly encountered.
- Spikes of Villainy: In Doom Eternal, imps sport pronounced spikes of bone on their backs, to more closely resemble their classic designs.
- Took a Level in Badass: Here, they are considerably more agile and aggressive foes than before. They often throw fireballs while running, cling to walls and pipes to rain down fireballs upon targets, and have a charged fireball attack that, on higher difficulties, can One-Hit Kill players without armour.
- Wall Crawling: They can climb and cling to walls to get a better shot at you.
A humanoid creature geared with an arm-like protrusion that can charge up and emanate a beam of unrefined Argent energy. Debuted in the 2016 game.
- Arm Cannon: Their right arm is replaced by a large protrusion that functions like a laser cannon.
- Canon Foreigner: A new enemy type created for Doom 2016.
- Frickin' Laser Beam: Their primary method of attacks is to fire a beam of Argent energy at you, be it sniping from a distance or spraying the beam horizontally.
- Long-Range Fighter: While they can swing their arm as a melee attack, they usually prefer staying at a far distance from you.
- Palette Swap: They are essentially tougher Possessed Soldiers carrying laser-beam weapons, and share most of their animations and glory kill sequences. In fact that was exactly what they were in early versions of the game.
- Power Glow: Their body emits red lights of unrefined Argent energy.
- Puppeteer Parasite: The Handbook reveals that the actual Hell Razer is a parasite that takes over the body of another organism early in its life and later mutates its arm into an organic cannon.
- Throat Light: Their throat also emits a glowing red light.
So-named for their pink colouration, Pinkies will charge their foes and possess heavy armour, with only their backsides vulnerable. Spectres are identical to Pinkies but are completely invisible save for the light refracting through them.
- Attack Its Weak Point: Only their backsides are vulnerable to damage.
- Ascended Fanon: 'Pinky' originated as a Fan Nickname, as their official name of 'Demon' was often confusing. In-universe, Pinky was coined by UAC expedition soldiers, the nickname sticking because researchers couldn't find any direct references to the creatures in demonic texts.
- Bullfight Boss: Not a boss, but in the 2016 pinkies are extremely well-armoured in front and very prone to charging, making encounters with them similar gameplay wise.
- Close-Range Combatant: Have no ranged attacks, relying on their melee charge.
- Heavily Armored Mook: Their bony armour on their heads protects them from weapons fire.
- Food Chain of Evil: They are said to be beasts of burden and livestock in the 2016 game. At the very least, they're something of a delicacy.
- Made of Iron: The 2016 version is not totally invulnerable from the front, so you can, in fact, shoot your way out if one corners you in a narrow passage, but its armored carapace takes a lot of firepower to punch through.
- Took a Level in Badass: The 2016 rendition of the Pinky gives it chitinous armor covering most its front that is highly resistant to bullets and plasma, as well as a charge attack that can be difficult to dodge. They can be a serious problem, especially if you have to deal with more than one at once...and especially in the Classic Stages where they still have all their new power, but appear in the same numbers as the original.
- Visible Invisibility: The Spectre's invisibility is a Perception Filter said to be the result of implanting a Cacodemon's optic nerve into a Pinky test subject, allowing it a form of psionic invisibility... a trait somehow passed on to offspring when the Spectre escaped back to Hell and reproduced.
Floating skull demons, the 2016 incarnations of the Lost Soul aren't too different from their classic counterparts.
- Action Bomb: They blow up on impact.
- Airborne Mook: Just like their classic counterparts, they float around.
- Demonic Possession: What they are trying to do by ramming you, according to the lore. It does say it only works on the weak-willed, which explains why they don't possess the Doom Slayer even if they kill him.
- Fragile Speedster: They move quite quickly, but go down with just a few shots.
- Glass Cannon: They go down easily, but their attacks deal a lot of damage if they hit.
- Technicolor Fire: In the 2016 game, their flames can change colour. When they're calm and just floating around, they have a blue flame, but when they see you, their flame turns a pinkish-red as they charge.
Large red floating head demons, the 2016 Cacodemons look much more like their classic counterparts than their Doom 3 versions.
- Breath Weapon: They spew globules of "psychoactive narcotic bile", which messes around with vision and speed temporarily as well as damaging a victim.
- Combat Tentacles: The Multiplayer variant can launch tendrils out of its mouth to grab players and instantly eat them.
- Cyclops: Only has one big eye in the middle of its head.
- Eye Scream: Most glory kills involve damage to their eye.
- More Teeth than the Osmond Family: This version has four jaws (two horizontal, two vertical) all bristling with teeth.
- Shock and Awe: They shoot ball lightning, which if it hits will mess around with the Praetor suit for a bit.
- Took a Level in Badass: They do considerably more damage with their bite attacks than before, and their spit causes Interface Screw should it connect.
A walking skeleton with the ability to fire rockets off its shoulders. Exactly why they look so humanoid is finally explained...
- Airborne Mook: They can fly for short periods of time.
- And I Must Scream: They are former human beings who were effectively Flayed Alive and implanted with cybernetic components — all of it without anesthesia — before being subjected to a weeks-long Lazarus Wave exposure that finally killed them from sheer pain... only to bring them back as undead pseudo-demons, suffering forever.
- Body Horror: This game makes them far more disturbing than mere animated skeletons with rocket launchers.
- Death from Above: Revenants in the 2016 game have jetpacks that allow them to take flight and launch a barrage of missiles from the air.
- Dem Bones: The 2016 Revenants are once-human bodies flayed down to mostly bones and guts.
- The Dog Bites Back: Despite them willingly serving themselves up to be turned into some demonic horror by the UAC to be used as a weapon, one doubts that the fact that they are going to have to "live" with constant unending agony isn't going to give them second thoughts.
- Everything's Deader with Zombies: Like the Possessed, the 2016 version of the Revenant is a Human Sacrifice who was brutally mutilated to death, upgraded with cybernetic implants, and then brought back to life with demonic energies.
- Fatality: In the 2016 game, if they defeat the Doom Slayer, they will rip off both of his arms, slap him with one of his own arms for added insult, and then crush his skull with a single punch.
- Homing Projectile: One of the rockets he can launch.
- Human Sacrifice: As with the Possessed, in the 2016 game, they were humans who volunteered to be butchered and reanimated to become the UAC's deadly new living weapons.
- Jump Jet Pack: The 2016 Revenants can't sustain flight for long, but they can use their jump-jets to bound large distances across the battlefield, making them a lot more mobile than in earlier games. Entertainingly, the pack often malfunctions and can lead to them (briefly) flying out of control before exploding in many death animations.
- Macross Missile Massacre: In the 2016 game, they can shoot a lot of rockets, very quickly.
- Mascot Mook: For the Collector's Edition for the 2016 game. One is on the cover of the box the Collector's Edition comes with, as well as being on the cover of the steelbook, as well as coming with a 12"-tall statue of one.
- Super Soldier: In the 2016 game, they were intended to be the next step up from the Possessed in the UAC's arsenal, being cybernetically augmented before turned into pseudo-demonic undead warriors.
- Turned Against Their Masters: Unfortunately for the UAC, the Revenants were no more loyal in the face of a demonic outbreak than the Possessed, though can you really blame them?
- Took a Level in Badass: Has been given a jetpack in the 2016 reboot, allowing it to quickly move across large distances and fly up to rain down missiles on players who try and hide behind cover.
- Was Once a Man: Revenants in the 2016 game used to be human volunteers. First, the rocket launchers are grafted to their shoulders along with an Argent-charged chip implant that allows them to mentally control the launchers. The subject is then exposed to Lazarus Waves and Argent Energy, causing rapid bone growth to the point that the Revenant grows to some three meters in height, whilst all skin, plus most muscle and connective tissue, is avulsed - i.e. ripped off/ejected, and the internal organs are exposed. Now bolt on some exoskeletal parts to hold everything together and boom, you have yourself a combat-ready Revenant.
Mancubus & Cyber-Mancubus
Really fat demons with fireball cannons for arms. The Cyber variant is the result of UAC experimentation on several test subjects, outfitted with two corrosive acid guns as opposed to the organic flame cannons.
- And Show It to You: One of their Glory Kill options in the 2016 game involves ripping out their heart and then stuffing it down their throats.
- Arm Cannon: Each arm on the Cyber variant has been replaced by a huge cannon, which they use to kill anything in their way. The regular Mancubus has organic arm cannons that form naturally.
- Body Horror: In the 2016 game, it's stated that their arm cannons are based on chitinous growths that envelop their hands and squirt a noxious, flammable effluvium derived from their own decaying flesh, creating bizarre biological flamethrowers.
- Color-Coded for Your Convenience: In addition to being larger, the Cyber-Mancubus has green bioluminescent lights on its body as opposed to the regular's red.
- Damage Sponge: They can suck up a lot of ammo before going down.
- Fat Bastard: Larger than most demons, and designed to look really fat. Humorously, according to one of its Codex entries the UAC tried to remedy this with all-encompassing armor but the Cyber-Mancubi kept outgrowing said armor anyway.
- Giant Mook: They're one of the biggest demons in the game.
- Ground Pound: Mancubi can do this to attack you if they feel you're too close in the 2016 game.
- Ironic Name: Part of their name references the rather good-looking succubus or incubus... these guys are anything but good looking.
- Jiggle Physics: On their bellies.
- Mighty Glacier: Slow, but their durability and damage output can be frightening.
- Non-Indicative Name: Rather than being the Spear Counterpart to succubi, they're heavily associated with Gluttony, at least in the 2016 version. They're Fat Bastards with twin Arm Cannons that spew fireballs (or globs of Hollywood Acid in regards to the Cyber-Mancubus), not Horny Devils.
- Organic Technology: The Mancubi in Doom 2016 have organic Arm Cannons. Inverted with the Cyber-Mancubi, who use cybernetic cannons akin to the "old school" Mancubi, and averted completely with their design in Doom Eternal, which is directly based on the classic mancubus appearance.
- Playing with Fire: They're armed with two flamethrowers.
- Poisonous Person: The Cyber-Mancubus can't ignite the bile it produces anymore due to the replacement of the chitinous cannons with rifled cybernetic barrels; however, the resultant slime is both immensely toxic and highly corrosive. Combined with its ability/preference to fire these globs from longer distances, this makes the Cyber-Mancubus just as lethally effective than its organic counterpart.
- Took a Level in Badass: In the 2016 game, they have a number of new attacks to defend against players who try and circle-strafe it at close range, such as a "vent" flame-shockwave that repels anyone too close and using its arm cannons as flamethrowers.
- Truer to the Text: As seen above, mancubi are given the most dramatic redesign of Eternal's demons, ditching the chitinous cyclops appearance of 2016 for the classic 'fat ogre' form, with cybernetic arm cannons instead of Organic Technology.
- Walking Wasteland: Downplayed; the bile fired by the Cyber-Mancubus will create a toxic pool that damages anything that enters it whilst it lingers.
- Underground Monkey: The 2016 game has both the regular Mancubus and the Cyber-Mancubus, the latter of which has had its chitinous armor/Arm Cannons replaced with green metal plating, mechanical Arm Cannons, and is also outfitted with a fancy technological helmet to better visually distinguish it. In true Underground Monkey fashion, the Cyber-Mancubus is also more dangerous than its vanilla counterpart, with unique variations of the standard attacks alongside increased health and damage output.
Baron of Hell & Hell Knight
Hell Knights in this game bear a close resemblance to their counterparts in Doom 3, while the Barons make a reappearance, with their own unique appearance.
- Authority Equals Asskicking: The Barons are said to directly serve the Lord of Hell, and boy, do they make it known.
- Big Red Devil: The Baron of Hell, just like his classic counterpart.
- Close-Range Combatant: Unlike his classic and Doom 3 counterparts, the new Hell Knight has no ranged attacks, but compensates with his high speed and close combat capabilities.
- Discard and Draw: In Multiplayer, the Baron of Hell loses his ability to throw fireballs but gains the ability to pound the ground that launches a row of rock spikes in front of him.
- Divergent Character Evolution: Hell Knights in Doom 2 were Palette Swaps of Barons of Hell with lower health. In Doom 3, they took a similar role as the Baron of Hell did in the original, and sported a different look. Come the 2016 game, and they're a lot different, now a tough Close-Range Combatant that lacks the projectile moves their original and Doom 3 variants had, while the Baron of Hell utilizes both close range attacks as well as green fireballs, while keeping close to their original look.
- Fatality: Barons will knock you to the ground, pin you under a hoof, and then rip off both your legs. Then they'll grab your head in one hand and crush it. The Hell Knights will just crush you to a pulp with three Megaton Punches.
- Lightning Bruiser: They are no longer the lumbering behemoths they were in previous games. Now, they are extremely agile, able to perform devastating leaping ground pounds and traverse up to higher surfaces with ease.
- Eyeless Face: The Hell Knight has no visible eyes in Doom 2016. Averted in Doom Eternal, which redesigns them to have glowing red eyes.
- Magma Man: Barons in Eternal are redesigned this way. As the player deals damage to them, their ashen grey hides crack away to reveal a molten, skeletal core.
- Smash Mook: Hell Knights have lost their ranged attacks, but make up for it with their speed and agility.
A floating, rapidly moving enemy that can conjure up other demons and shoot waves of fire. Essentially the 2016 game's version of the Arch-Vile.
- Elite Mooks: Said to be a very advanced offshoot of the Imp.
- Enemy Summoner: Exactly What It Says on the Tin.
- Expy: Of the Arch-Vile. It's a mook with a fast fire attack and the ability that forces the player to fight more demons.
- Lightning Bruiser: Not the strongest demon, but it has a fairly quick attack, moves very rapidly among the mobs it summons, and can take a bit of a beating.
- Mook Maker: As the name suggests, Summoners call other demons into battle.
- Teleport Spam: They teleport around rapidly to avoid you.
An Imp-like monster featured in the multiplayer game for the demon side. Prowlers are fast-moving, agile creatures that can only attack in melee, but will eviscerate anything that they get their hands on.
- Ceiling Cling: Their ability to latch onto the walls and ceiling enables them to better maneuver around the battlefield.
- Extra Eyes: They have three eyes in a crude right-pointing triangle shape on their forehead.
- Fragile Speedster: They have awful health, but their spider-like climbing ability and fantastic leaping ability lets them really move across the arena.
- Glass Cannon: If you get can get a bead on one, it'll go down pretty easy. If it gets up close to you, all of its attacks are One Hit Kills.
- In a Single Bound: They can jump very far and very fast.
- More Teeth than the Osmond Family: They have a tripartite jaw, with the lower jaw opening vertically as well as horizontally.
- X-Ray Vision: The Prowler has the ability to see enemies through walls, better allowing it to evade and ambush other players.
A demon similar in appearance to the Summoner which only appears in the multiplayer game. It was added in the first expansion pack; "Unto the Evil". It uses vampiric plasma beams to steal the lifeforce from its victims and then convert it into hellish energy projectiles.
- Cyclops: Sports a single large, yellow eye that dominates its face.
- Foreshadowing: During the Doom Slayer's infernal "downloads" at key points in the single-player game, brief shots can be seen of demons resembling the Harvester.
- Life Drain: Its primary mechanic is its ability to leech health for itself from opposing players.
A floating one-eyed demon that can unleash multiple flaming projectiles.
- The Bus Came Back: After being absent from the franchise since Doom 64 (released in 1997), pain elementals return for Doom Eternal.
- Cyclops: Only has one big red eye in the middle of its giant head.
- Elite Mook: Serves as an upgraded, tougher version of the Cacodemon.
- Element Number Five: It's an elemental, a being formed from a concept. But rather than the standard fire, water, earth or air you see with most elementals, this one is a hell beast formed from pure pain.
- Eye Scream: One glory kill involves stabbing their eye out of their head from below their skull with the Slayer's Blade Below the Shoulder, after he shoves his fist into their mouth.
- Playing with Fire: Can summon balls of flame over its head that it will then throw at the player.
- Waddling Head: Played with. Since it's a giant demonic head that floats around rather than walks, it doesn't have feet, but instead has two stubby little arms, which it uses to pantomime various motions that make it look like it's stomping through the air towards you.
A demon with the power to control flames and summon fallen comrades back from the dead.
- Ass-Kicking Pose: Will raise its flaming hands into the air when summoning fire.
- Elite Mooks: Serves as an upgraded version of the Summoner in Eternal.
- More Teeth than the Osmond Family: Has a mouthful of jagged, pointy teeth.
- Playing with Fire: Has the power to control flames, lighting up its hands, summoning fireballs from the sky, and turning the area around it into a sea of flames.
Spider-like mixtures of giant brain shaped demons and cybernetics
- Cyborg: Its legs are robotic, while its body is a giant demonic brain.
- Brain Monster: Like the Spider Mastermind, they resemble demonic brains with vestigial limbs mounted on Spider Tank bodies.
- The Bus Came Back: After being absent from the franchise since Doom 64 (released in 1997), arachnotrons return for Doom Eternal.
- Degraded Boss: They're a Mook version of the Spider Mastermind Final Boss from Doom (2016).
- Giant Spider: They're demonic spider looking monsters that are the size of a truck.
- Impaled with Extreme Prejudice: One of their glory kills involves stabbing them through the eye with their own leg.
- Wall Crawl: They can crawl over pillars, walls and ceilings using their giant spiked legs
A demonic cyborg skeleton with a hovertank for legs.
- Chainsaw Good: Its left arm has a set of two chainsaws on it.
- Cyborg: It's a mostly robotic demonic skeleton who still has part of its head, chest and right arm still made of flesh.
- Cyber Cyclops: Only has one big robotic eye in the middle of its head.
- Expy: Its character design, from the majority of its body being replaced with technology and weaponry to its lower half substituted with a tank, resembles the similar characteristics of the Saboath from Doom 3.
- Hover Tank: The lower half of its body is a giant armored platform that floats in the air.
A demonic warrior with a strangely similar appearance to the Doom Slayer
- Evil Counterpart: Serves as an evil version of the Doom Slayer, with a similar build, similar armor, and equivalents of some of the marine's weapons.
- Laser Blade: Uses a double-sided axe whose blades are made out of pure hell energy.
- Shotguns Are Just Better: Uses a super shotgun like the Doomguy.
- Sword and Gun: Weilds an axe and a shotgun at the same time.
A Baalgar-class demon captured by the UAC and cybernetically modified to be even more lethal. The BFG-9000 was supposed to be attached to this monstrosity before the incident.
- Back from the Dead: Twice. This guy was a pile of bones before a bunch of scientists got their hands on him, and after being forcibly shut down by the Doom Slayer tearing his power source out, he comes back for another round by absorbing Hell's ambient energy.
- Determinator: This creature wills himself back to life out of sheer psychopathic hate for the Doom Slayer.
- Somewhat justified in that you kill it once to generate a portal to Hell, which is where the Argent Energy powering it comes from. So you banish it and go to a place where it can come back stronger.
- Damage Sponge: Not so much as its classical incarnation, but trust us when we say it doesn't need to be.
- Dishing Out Dirt: When in hell, it gains the ability to create rock walls to trap the player and heavily restrict movement.
- Flash Step: He uses these to make himself harder to hit during the boss fight.
- Foreshadowing: The third Cyberdemon codex includes some speculation as to how the lobotomized Cyberdemon was able to consciously redirect the Argent Energy in a way that would specifically heal its brain. The official report on the incident apparently suggested a theory that demonkind actually operates as a pseudo-Hive Mind under the direction of a "mastermind".
- For Science!: What amounts to the thought process behind the Too Dumb to Live scientists at UAC in making the Cyberdemon in the first place.
- Gone Horribly Right: The think tank responsible for the reanimation and modification of the monster were giddy to make it an "ultimate battle demon" and thought of it too good a chance to pass up. They completely ignored the fact that they had no good ways to control said demon, nor did they have a "why" to add to their "how," so they did end up with a great demon warrior...and without any methods to make sure it would stay on their side. It took a Heroic Sacrifice from one of the scientists to lure the demon into a containment chamber, and they sealed it in pending a means to actually control it properly.
- It's Personal: Considering he was a Shadowlord who was offed by the Doom Slayer and how he reacts when he sees him again, one could agree that his experience has left him with a massive chip in his shoulder.
- Kill It with Fire: Once it drags you into Hell, it will randomly throw walls of fire at you.
- Lightning Bruiser: This iteration of the Cyberdemon is very fast, and the codex entries outright boast of its ability to take extreme amounts of punishment.
- Living MacGuffin: Doomguy needs the Argent Accumulator powering the Cyberdemon in order to send himself to Hell.
- Laser Blade: If one looks carefully enough as it performs its Sword Beam attack, it appears to conjure first a larger energy sword based off of the bony spike on its arm before tossing the projectiles.
- Macross Missile Massacre: Aside from fighting with a cybernetic left arm ending with a rapid-fire rocket launcher as its main weapon, it also has a back-mounted artillery system that will launch an aerial bombardment.
- Mythology Gag: The design of the Cyberdemon's upper carapace gives it a noticeable resemblance to the armour worn by the classic Doomguy, even including "shoulder pads", exposed biceps and a pectoral-shaped frontal section. While easily missed, the Cyberdemon also possesses a partially-cybernetic right foreleg, calling back to its own classic design.
- Off with His Head!: In his second phase, if he kills the Doom Slayer with his crescent-shaped energy blade projectile attack, you get to watch through the Doom Slayer's eyes as his head falls onto the ground behind his body, which promptly collapses without it.
- This is also how the Cyberdemon itself is finally put down, as the Slayer snaps off its intact horn and then strikes the Cyberdemon's head with it, with enough force to annihilate everything above the monster's lower jaw.
- Roaring Rampage of Revenge: This creature used to be an ancient Shadowlord before the Doom Slayer fatally deposed him. After regaining sentience and finding the Doom Slayer again, he doesn't take it well.
- Sword Beam: In its second phase, the Cybderdemon occasionally fires three wide sword slash projectiles that require the Doom Slayer to jump or crouch to avoid them. Missing a jump hurts. A lot. The Cyberdemon also creates barriers to form a tight 'corridor' during this attack, preventing the player from simply strafing out of the way.
- Too Dumb to Live: Not the Cyberdemon itself, holy hell the thing is competent. But the scientists who brought it Back from the Dead thought that turning it into an "ultimate battle demon" was a good idea. The creature was hostile from the outset and at first the people who created it put the creature into an effectively brain-dead state to stop it from killing everything around it at the first opportunity, then they started tinkering with the creature's Argent Energy core, so it could direct the energy to any part of its body at will. Cue the beast using this to jolt itself back to consciousness and override their programming before going on another rampage with any hope of restraining it lost.
- Wave Motion Gun: One of its attacks in this iteration is a huge energy blast. Also, that BFG-9000 you're so proud of? Yeah, it was supposed to belong to this guy here.
- We Can Rebuild Him: When the UAC captured him, he was nothing but fossilized remains. Argent Energy revived him, and he was outfitted with cybernetic enhancements that made him incredibly hard to subdue or kill.
- You Will Not Evade Me: In Hell, it can create rock corridors to heavily restrict the player's movement, specifically to enable the use of its Sword Beam attack.
A trio of demonic suits of armour, each playing host to a diminutive, snakelike creature that controls it.
- Barrier Warrior: The first Hell Guard has an energy shield that it only drops when attacking, and even then only giving a brief window to hit it.
- Canon Foreigner: Other than the basic zombies and the Hell Razers, they're the only enemies in the game not directly based off of an enemy from the classic Doom games.
- Conservation of Ninjutsu: The first Hell Guard, who you face one-on-one, has some very damaging attacks and a magical barrier that renders it invulnerable unless attacking. The second and third attack you jointly, but lack some of the more damaging attacks of the first and lack the barrier, making them easier to defeat.
- Defiant to the End: The third and final Hell Guard you kill has one of the most drawn out Glory Kills in the game because of this. After you break open its shell, the tiny parasite inside bites down hard on the Doom Slayer's hand, and he visibly struggles to pull it out of the armor. It takes several seconds to tug the Puppeteer Parasite free, and it's doing its best to bite into the armor, but eventually the Slayer tugs it free. It's still doggedly biting down even as the Slayer tries to pull it in half.
- Dual Boss: The second and third Hell Guards attack you at the same time.
- Expy: The Puppeteer Parasite inside them looks just like a Goa'uld.
- Powered Armor: All they are is basically magical and meaty suits of armour with a Puppeteer Parasite inside both piloting it and acting as its battery.
A vaguely spider-like cybernetic demon monstrosity referred to in Hell as the Aranea Imperatix. Actually Olivia Pierce transformed demonic form after being possessed by the leader of the demon's invasion of Mars when she reaches the ruins of Argent D'nur.
- Badass Boast: Not on its part, but the Codex entry on it has quite an impressive one from the demons of Hell:When the gate is opened, in the fourth age, when we have risen and the masters have shown us the path, she will be come. A great blessing will be given to the key holder, for they will become one with the master, and in that holy union the power of the dark priest will be unleashed upon the heretics of the Penumbral Plain. The Aranea Imperatix. Carried in the mind of all who follow, fed from the blood of those who fell, made with bone of rock, iron, steel and sinew. A mighty god to rule over all other gods. One become two become legion.
- Beam Spam: It makes use of a plasma chaingun and multiple laser blasters to roast and toast anything in her way.
- Be Careful What You Wish For: The result of such a wish. Olivia wanted unfathomable godlike power, and her demonic patrons gave her everything she wanted and more. Just not the way she likely would've liked it.
- Cephalothorax: Like the original incarnation, she's a big head with an even bigger brain, mounted on a spider-like chassis with little stubby hands.
- Damage Sponge: She will take a Hell of a beating before finally going down. While she does drop ammo after certain amounts of her health are shaved off, it's not uncommon to run out of ammo when fighting her.
- Final Boss
- Freeze-Frame Bonus: She can be spotted briefly in a vision the Doom Marine gets when first reaching the Lazarus Labs (replacing the loading screen), hinting at her connection with Olivia Pierce.
- Giant Space Flea from Nowhere: Her inclusion in the game is obliquely hinted at in exactly one lore entry, with no other mention until you fight her. After dropping down into the boss arena, Olivia Pierce is shocked, and transforms into the Spider Mastermind. Then the battle starts.
- Ironic Death: She's eventually killed with the BFG...which she helped design.
- Mind over Matter: One of her powers is telekinesis, which she uses to throw bits of the arena at you.
- Mythology Gag: In the original Doom's manual, it noted to be thankful for the small mercy that the Spider Mastermind didn't wield a plasma weapon like her Arachnotron underlings. Guess what? This one does.
- The original Spider Mastermind from the first game was famously killable with a single point-blank BFG shot. The Glory Kill you perform on this version has Doomslayer shove the BFG in her mouth to finish her off.
- Psycho Electro: One of her attacks lets her create a burst of electricity in an aura around herself.
- Samus Is a Girl: Although it's not much of a surprise when you finally get to it since Olivia transforms into it. But the codex on it does refer to it in female terms.
- Shock and Awe: The second half of her boss battle has her electrifying the floor, requiring the Doomguy to jump on top of pillars to avoid damage. Her final phase has her manipulating electricity to throw the same pillars at the Doomguy.
- Shows Damage: She becomes increasingly bruised and has greater trouble moving as you damage her. By the end of the fight, she's just flailing lasers and limbs that can no longer support her weight at you in an attempt to get you to relent.
- Spider Tank: Her lower half is a cybernetic, four-legged chassis meant to support her quite large head.
- Turns Red: Halfway into the fight, she rips out a pair of cables that keep her psychokinetic powers properly restrained and begins electrifying the floor and tossing pillars at you like javelins.
- Villainous Breakdown: As the fight goes on and the damage she's taking starts catching up with her, she becomes much more desperate in her efforts to kill you. Her final phase is a pathetic blast of everything she's got left, most of which won't even hit you. By the time you've weakened her enough for a Glory Kill, she's pretty much given up and resigns herself to her imminent death.
- Was Once a Man: This demonic monstrosity is none other than Olivia Pierce herself, having been "rewarded" by her demonic superiors.
- Your Head Asplode: The result of being executed point-blank with a BFG blast through her mouth. Granted, there's not much of her to 'asplode ''besides'' head.