History Characters / Doom2016

** [[Characters/Doom2016TheDarkLord The Dark Lord]] '''(UNMARKED SPOILERS)'''

This page indexes the characters and enemies of ''VideoGame/Doom2016'' and ''VideoGame/DoomEternal''. For tropes relating to the characters of [[VideoGame/{{Doom}} the classic games]], see Characters/{{Doom}}; for those found in ''VideoGame/Doom3'', see Characters.Doom3.

This page indexes the characters and enemies of ''VideoGame/Doom2016'' and ''VideoGame/DoomEternal''. For tropes relating to the characters of [[VideoGame/{{Doom}} the classic games]], see Characters.{{Doom}}; for those found in ''VideoGame/Doom3'', see Characters.Doom3.

This page indexes the characters and enemies of ''VideoGame/Doom2016'' and ''VideoGame/DoomEternal''. For tropes relating to the characters of the classic games, see Characters.{{Doom}}; for those found in ''VideoGame/Doom3'', see Characters.Doom3.

This page indexes the characters and enemies of ''VideoGame/Doom2016'' and ''VideoGame/DoomEternal''. For tropes relating to the characters of the classic games, click [[Characters/{{Doom}} here]]; for those found in ''VideoGame/Doom3'', click [[Characters/Doom3 here]].

This page contains tropes for the unique characters and boss-monsters in ''VideoGame/Doom2016'' and ''VideoGame/DoomEternal''. For tropes relating to the characters of the classic games, click [[Characters/{{Doom}} here]]; for those found in ''VideoGame/Doom3'', click [[Characters/Doom3 here]]. For the enemies you fight, [[Characters/Doom2016Enemies click here.]]

[[foldercontrol]]
%%Do not change the quotes without discussing it first on the discussion page.
!Protagonist
[[folder:The Doom Slayer]]
!!The Doom Slayer %%Do not add the Doomguy spoiler per Administrivia/HandlingSpoilers
!!!'''Voiced by:''' Matthew Watterson
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/doomguy_retracted_2.png]]
[[caption-width-right:350:''"Rip and Tear, until it is done."'']]

->''"In the first age, in the first battle, when the shadows first lengthened, one stood. 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. In his ravenous hatred, he found no peace, and with boiling blood, he scoured the Umbral Plains, seeking vengeance against the dark lords who had wronged him. He wore the crown of the Night Sentinels, and those who tasted the bite of his sword named him... '''the Doom Slayer.'''"''
\\
A silent, unnamed SpaceMarine who awakens laying inside a stone sarcophagus on a UAC base on Mars that has literally gone to Hell. After smashing in a zombie's head with his bare hands and acquiring his PoweredArmor from another nearby coffin, the marine proceeds to butcher his way through an army of demons to put an end to the madness.\\\

While [[MysteriousPast his past is initially shrouded in mystery]], one thing that is clear is that 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.

* NinetiesAntiHero: Has [[IHaveManyNames many]] [[DarkAgeOfSuperNames simple, yet gritty names]], NoSocialSkills, [[AxCrazy a penchant for grievous bodily harm, oftentimes using his own bare hands]], [[TheDreaded a threatening presence to both humans and demons alike]], and a simple, yet effective KillEmAll strategy to handling demons and their tech using an [[{{BFG}} oversized]] [[HyperspaceArsenal arsenal]]. He could just as well have been a villain if not for [[UnscrupulousHero his solid moral centre]] underneath the anger and, come ''Eternal'', [[TheExtremistWasRight how it's really hard to disagree with his stance on meddling with the demonic]].
* ActionHero: 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.
* {{Adorkable}}: [[RealMenWearPink Yes,]] [[HiddenDepths really.]]
** The Doom Slayer's response to finding a tiny action figure recreation of himself? Give the little dude a fist-bump, wiggling his fingers as he pulls his hand back.
** When the Slayer finds a similar collectible toy of himself in ''Eternal'', he unsheathes his BladeBelowTheShoulder -- then raises the figure's left hand in the exact same pose before ''bouncing it up and down in happiness for a few moments''.
** He keeps an oil painting of him holding a cute, fluffy bunny rabbit in his office. [[spoiler:This is one of the first and biggest hints that he's ''the'' Doomguy.]]
** In both games, he can seek out and collect a variety of cute action figures of both himself and the demons; he even has an entire shelf set aside for them in the Fortress of Doom.
* TheAgeless: As given by what visible features we do see, the Slayer's still very evidently in a physical prime. The Khan Maykr even calls him '''once'' a mortal', implying that [[spoiler:either his exposure to Hell energy or the Argent infusion done by Samur halted his aging.]] Taken even further in that he's a [[spoiler: human being]], and thus has stayed in relatively-young adulthood for bare-minimum one hundred and fifty years, and given how the demons describe how he has been around since 'the first age when the shadows first lengthened', that really is a ''bare'' minimum.
* AmbiguouslyHuman: Has 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. His Praetor Suit, which was supposedly forged in Hell, has the ''English'' letters and numbers "8623", "D22", "CAUTION" and "1/0 Logistics Manufacture" printed on it. In ''Eternal'', Novik and the Betrayer also call the people of Earth "your people" while talking with the Slayer. Logs found in ''Doom Eternal'' confirm the Doom Slayer is genetically human ([[spoiler:further confirmed by him being Doomguy from the original games]]), but his body is infused with things the UAC cannot identify which give him his increased speed and strength. A {{Flashback}} shows this is something done to him [[spoiler:by the mysterious hooded "Seraphim", one of Khan's right-hand angels, during his time with the Sentinels]]. The Khan Maykr notes that he's no longer a mortal, while Hayden refers to him as a Titan much like the Icon of Sin.
* AndShowItToYou: 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.
* AnthropomorphicPersonification: In ''Doom Eternal'', Dr. Elena Richards (UAC scientist trying to figure out what/who the Doom Slayer is) gets a crisis of faith, wondering if the Doom Slayer is an agent of God, or some sort of divinity himself. After seeing footage of him singlehandedly overturning Hellish hordes that Earth's greatest weapons could do nothing about, and noting how he's [[TheDreaded the only thing the demons truly fear]], she comes to the conclusion that he must be this. Once a man, now the literal embodiment of Doom.
* AntiHero: 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.
* AreTheseWiresImportant: The Doom Slayer's preferred method for dealing with Argent Energy equipment is to just start breaking things, despite Hayden's demands that he use utmost care (though this is also less a matter of being clueless as to what he's dealing with and more [[EveryoneHasStandards refusing to accede]] to Hayden's desire to preserve the Argent energy program against all good judgment).
* AssassinOutclassin: In ''Eternal'', it’s mentioned that the Doom Hunter, a breed of demon that was specifically created to hunt the Doom Slayer, was rendered extinct, and it’s heavily implied the Slayer himself had a hand in that.
* AsskickingEqualsAuthority: [[spoiler:The surviving Night Sentinels regard him as their king, due to the fact that the Night Sentinels naturally select the most badass FrontlineGeneral in the eternal war against demons as the one most fit to rule]].
* AttackAttackAttack: His ''entire shtick'' is focused around exactly two things - sheer speed and killing power. If you're not constantly moving and killing, you're going to die; he has absolutely ''zero'' defensive potential other than sheer offence. Properly played, he is the fastest and deadliest thing on the battlefield - but only if you take advantage of his strengths.
** The only enemy in the franchise that comes close to matching his mobility is the Marauder, who is feared and hated by many players for this exact reason.
** His damage output is unmatched; even the above-mentioned Marauder can easily turn into chunky kibbles in ''literal seconds'' if you combo his gear properly.
** Once he gets the [[OneHitKill Crucible]], all bets are off; nothing in the game is safe from an instant dismemberment by the massive laser sword.
* AxCrazy: The fact using his ''bare hands'' to kill demons is the easiest way to restore his "[[CallAHitPointASmeerp 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. Played straight with his backstory, [[spoiler:which concretely confirms him to be Doomguy of classic ''Doom'', ''Doom II'', ''Doom 64'': though he stayed behind on the other side of the portal to fend off the forces of Hell at the end of ''64'', an admirable [[HeroicSacrifice self-sacrifice]], [[RealityEnsues the reality kicked in that would come with fighting for one's life every second of every day, with no reliable nutrition, hydration, sleep, or human contact of any kind]]. By the time the Night Sentinels found him, he was a battered, gibbering mess that could literally operate on nothing beyond murderous intent and refusal to die. His rambling when found becomes King Novik's commandment to the Slayer when unleashing him: "Rip and tear"]].
* BarbarianHero: 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 [[SleevesAreForWimps lost the sleeves on his battle armour]] and picked up a magical CoolSword.
* TheBerserker: [[TranquilFury A quiet, but no less impressive, version.]] In spite of the fact that he never speaks, his actions and body language make it clear he is '''very, very angry.''' Every aspect of his kit enforces this; if you aren't moving and attacking, you're dying. Taken UpToEleven when he grabs a Berserk Pack, at which point he can OneHitKill anything in the game with a ridiculously over-the-top fatality. Highlights include [[YourHeadAsplode crushing heads between his hands,]] [[AndShowItToYou ripping out hearts,]] or [[HalfTheManHeUsedToBe literally tearing enemies apart, both vertically and horizontally.]]
* {{BFG}}: Uses a number of guns that are as big as him, including the Chaingun, Gauss Cannon, Ballista, and of course the BFG 9000.
* {{BFS}}: His WeaponOfChoice from Argent D'Nur is the Crucible, a LaserBlade greatsword.
* BookDumb: Zig-zagged, and ultimately averted. From the first glance, it's very easy to dismiss him as a violent halfwit who is extremely proficient at killing but clueless when it comes to everything else; however, paying attention to the lore in both games will paint a much deeper picture, giving an explanation to his moments of apparent stupidity or thoughtlessness.
** He completely ignores Hayden's entreaties to preserve the Argent Energy filters, instead smashing them in like an confused gorilla. [[spoiler:He knew well before the UAC ever discovered it just [[HumanResources what Argent Energy was]], and more importantly, [[TheCorruption what it could cause if left unchecked.]] The sequel proves him right on both counts.]]
** In the same vein, Hayden's pleas that shutting down Argent Energy would cause an energy crisis fall on deaf ears. [[spoiler:The reason Argent D'Nur fell was because it became dependent on the stuff, and the Slayer has seen first-hand that, bad as an energy crisis may be, HellOnEarth is ''ten times worse.'']] Indeed, going by the staggering casualties listed in ''Eternal'''s intro and the hideously-ruined state of Earth, he is again proven right.
** When told that [[spoiler:Hayden's wrecked chassis]] needs to be carefully removed from stasis, he simply grabs it and hauls it into a portal. [[spoiler:Given that Hayden was undoubtedly a high priority target for the demons, the Slayer probably guessed that something would be coming to get him, and understood that taking the time to get him out was far more dangerous a proposition than just grabbing him. Sure enough, the Marauder rolls up to the scene literal moments afterwards.]]
** He has [[BadassBookworm an extensive library]] in the Fortress of Doom, and he was somehow able to get VEGA - a fully sentient AI - up and running again from a presumably-bare bones copy kept on his suit.
** He never hesitates or has any visible issues dealing with technology at any point; while using computers and other devices he ''doesn't'' want to smash, he has no problems whatsoever.
** He was the [[spoiler: king of the Night Sentinels, and by all accounts, he did an excellent job leading them. If not for the Betrayer stabbing him and his TrueCompanions in the back, they ''would have won.'']]
* BladeBelowTheShoulder: In ''Doom Eternal'', the Doom Slayer's upgraded suit comes with the Doomblade, a retractable knife underslung to the left forearm, which he can use to stab and slash during his Glory Kills.
* BloodKnight: He's single-mindedly focused on murdering demons, and if the brutality of the [[FinishingMove Glory Kills]] is any indication, he likes fighting. Emphasized in an interview with the ''2016'' Creative Director.
-->'''Hugo Martin:''' Most people would avoid the gore nests because they start a fight. The Doom Slayer's looking for a fight.
* BreakTheBadass: [[spoiler:How he turns up mentally in the hands of the Night Sentinels after an untold amount of time in Hell. Some combat therapy and being given a reason to gradually stabilize himself went a long way to restoring his sanity - only to [[DoomedHometown lose everything all over again.]] This time he settled into a permanent ''rage'' instead of breaking again.]]
* BroadStrokes: The "Slayer's Testament" from ''2016'' 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, [[spoiler:until ''Eternal'' confirms he and Doomguy are one and the same, tying their stories together]].
* BruiserWithASoftCenter:
** He treats the collectible figurines with care. By the time ''Eternal'' rolls around, he even dedicates an entire room within the Fortress of Doom to housing his collection, neatly laid out as well.
** Lore entries in ''Eternal'' indicate that, at the very least, he regards VEGA with a certain amount of respect, dedicating part of his time to improving the program's functionalities. The fact that he thought to save a backup copy of VEGA in ''2016'' is a hint to his HiddenDepths.
** [[spoiler:As he is the original Doomguy, he had a legitimate, wholehearted fondness for his pet rabbit, Daisy. He even has a framed ''oil painting'' of him holding a rabbit in his Fortress of Doom... [[TragicKeepsake along with an empty cage containing a rabbit's foot]].]]
* CanonCharacterAllAlong: [[spoiler:''Eternal'' explicitly confirms the Doom Slayer is Doomguy from the original games, shown in a {{Flashback}} on Sentinel Prime wearing his iconic helmet. It also implies that the events of ''Doom 3'' somehow fits into his back story, as he has a Soul Cube of his own, as well. He keeps his old armour in the Fortress of Doom]].
* CanonName:
** As has been slated on multiple occasions in statements made by Id Software since ''Doom'' of 2016, [[spoiler: Doomguy is a direct descendant of the Blazkowicz bloodline.]] Now, whether or not that means it's the same as [[spoiler: in the Doom RPG titles, William Joseph "BJ" Blazkowicz III,]] hasn't been stated assuredly, but the family name at least is concrete.
** While it's from an EasterEgg that doubles as a CallBack, [[spoiler:considering all the strides taken to meld every ''Doom'' entry as part of the same universe, [=FLYNNTAGGART=] being the password to unlock ''Doom [=II=]'' in-game suggests that the Doom Slayer might use the name he has in the novels, Flynn Taggart, as an alias]].
** Lore entries give his Super Shotgun canonical nicknames by the forces of Hell, akin to dubbing the protagonist the Doom Slayer, [[NamesToRunAwayFromReallyFast Lucifer's Bane, and the Diabolical Musket]].
** With confirmation from ''DOOM: Eternal'' that he's [[spoiler: related to Commander Keen]] and that he's [[spoiler: the Doomguy from the original series,]] it's safe to assume that his name is either [[spoiler: William Joseph "BJ" Blazkowicz III or Stan Blazkowicz]].
* TheComicallySerious: He's silent, incredibly angry and is unbelievably violent. But there is some humour 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. Driven UpToEleven if the player is having him wear the [[SillinessSwitch Doomicorn]] armour, where he still looks permanently pissed-off and strikes powerful poses, but the goofy white-and-pink armour makes him all but unable to be taken seriously.
* CoveredInScars: What little is seen of him without his armour is covered with lots of small scars.
* CuttingTheKnot: If he can't solve a problem by shooting it, he'll solve it by punching it. Whatever the most direct means of accomplishing his objective is, he does it without hesitation.
** PlayedForLaughs in ''2016'' when Hayden attempts to verbally guide him through shutting down the Argent Filters without destroying them; Doomguy ignores him and promptly smashes it like an angry gorilla.
** This trope is taken to its' logical extreme near the climax of ''Eternal''. Problem? [[spoiler:He needs to get to a city buried deep under Mars' surface, and there's no way to get there.]] Solution? [[spoiler:'''[[WaveMotionGun Hijack the BFG 10,000]]''' and literally blow a hole directly to it.]]
* DeathGlare: His default expression is just a piercing glare at whatever pisses him off. He amps it up on several people who have earned a higher spot on his shit-list, and in response to anyone trying to convince him to give up on his quest.
* DeityOfHumanOrigin: [[spoiler: Demigod, for lack of better classification, at any rate.]] He was an entirely mortal being at first, [[spoiler: and human to boot,]] but that all was tossed to the wayside [[spoiler: when Samur, the Seraphim of Urdak, used the chamber meant to purge impurities to infuse Doomguy with Maykr genetics, the Maykrs themselves being the angel race of the Doom reality.]] As a result, he no longer ages, his physical ability is ''well'' beyond normal capability, the Kahn Maykr outright states that he's no longer mortal either, [[spoiler: but an examination of a blood sample recovered from him on Mars does confirm that, for the most part, he is by and large a part of the human race.]]
* DemonSlaying: ''[[ExactlyWhatItSaysOnTheTin What gave it away]]''? '''Everything''' the Doom Slayer does has the purpose of putting demons 6 feet under, getting to points where there are demons to be slain, finding new equipment to help him slay demons, or obtaining information and access needed to get deeper into demon territory. He lives and breathes solely for the purpose of slaying demons, and ''chose'' to be BarredFromTheAfterlife to continue slaying them. He will use whatever tools he can find to aid him in the goal of slaying demons, whether they are {{Improvised weapon}}ry, swords, {{chainsaw|good}}s, {{Laser Blade}}s, or {{BFG}}s, [[MultiMeleeMaster it does]] [[MultiRangedMaster not matter]], and if he runs out of ammunition, he will rip the demons apart with his bare hands, fueling his rampage through their own argent energies, making him a PerpetualMotionMonster. DemonSlaying is not a profession to him - it is ''all'' he is; after being woken up from being a SealedBadassInACan, he breaks free of his restraints and bashes the first Demon's head in within five seconds and doesn't slow down from there.
* DestructiveSaviour: Much to Samuel's annoyance, his method for solving problems usually amounts to destroying whatever is standing in his way -- including an Argent Energy extractor which took Samuel years to create.
* {{Determinator}}:
** His enemies hate and fear this aspect of his personality; see below. Throughout all the countless ages he's been fighting the demonic hordes, he has never once given up nor stopped fighting, even after being trapped alone in Hell for eons on end, losing all of his allies, knowing his actions may potentially doom civilization to a massive energy crisis, or even just being chained up completely naked to a slab with a zombie coming to bite off his face.
--->'''Slayer's Testament:''' Unbreakable. Incorruptible. ''Unyielding''. .... They knew he would come, as he always had, as he always will, to feast on the blood of the wicked.
** Creator/IdSoftware Creative Director, Hugo Martin, has [[WordOfGod admitted]] that [[Film/{{Robocop1987}} Robocop]] and Film/TheTerminator were two inspirations for how the Doom Slayer should behave. Both characters are uncompromising killing machines who never back down, are nearly impossible to kill, and will do anything to accomplish their mission.
* DidYouJustPunchOutCthulhu: 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. [[spoiler:Come ''Eternal'', he's added an alien god and her questionably-angelic minions to that bodycount]].
* DoomedHometown: After his allies, the Night Sentinels, were defeated and their realm Argent D'nur was destroyed, he embarked on an endless war into the bowels of Hell. [[spoiler:With the reveal in ''Eternal'' that he's the classic Doomguy, this also means demons invaded his Earth back in ''Doom II: Hell on Earth'', driving him to eventually remain in Hell to forever battle the forces of Doom at the end of ''64''.]]
* DoubleJump: His thruster boots upgrade lets him jump an additional time in the air.
* TheDreaded:
** ''The entirety of Hell'' tried to keep him [[SealedGoodInACan 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 ''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 DeathGlare and taking the terrified man's weapon without a word. The base computer also has alarms specifically to warn of the Doom Slayer.
--->'''Facility Voice:''' [[AC:Warning: The Slayer has entered the facility.]]\\
'''Facility Voice:''' [[AC:WARNING: Slayer threat level at maximum.]]\\
'''Facility Voice:''' [[AC:DANGER. ALL PERSONAL EVACUATE TO MARS SURFACE. THE SLAYER HAS CONTROL OF THE {{BFG}}.]]
* EmpoweredBadassNormal: The Doom Slayer collects assorted scientific and magical tokens to power himself up; argent energy cells to enhance his armour'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 OneManArmy on Hell, though records indicate that he was already kicking huge amounts of ass by the time they did.
** This extends to his backstory in ''Doom Eternal''; [[spoiler:He started out as a BadassNormal when the Sentinels found him, badly wounded after fighting demons since the original ''Doom'' games for god knows how long; and even when he was battered, wounded, and weak he still handed the asses of everyone they threw at him in the Colliseum, and after being given the [[FatalReward "prize"]] of being CannonFodder on the frontlines with the other "Arena Champions", he continued to fight and live when everyone else in his "rank" died. When the Demons invaded and all hope looked lost, one of Khan Maykr's right hand angels, The Seraphim, put Doomguy in a machine that was supposed to weed out the darkness out of the Sentinels. The Seraphim instead used it to power Doomguy up into the Doom Slayer by pumping him full of Pure-Maykr Grade energy.]]
* ElectiveMute: Doom Eternal notes that he’s fully capable of speech, but stopped doing so after gaining his enhanced power. He’s been completely silent for millennia.
* EstablishingCharacterMoment:
** The intro of the DOOM (2016) is one for the Slayer: He wakes up naked and chained to a slab, after Hell's forces sealed him in a coffin and [[ThereIsNoKillLikeOverkill dropped an entire temple on top of him]] just to be safe. The ''instant'' he's awake and aware, [[RatedMForManly 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]]. He then finds his armor and immediately searches for the source of the demonic infection on Mars. After which he goes on to clear another room full of demons. And the moment that [[MrExposition Samuel Hayden]] tries to justify what's happened to the base by saying that his actions were for [[WellIntentionedExtremist "the betterment of all mankind"]], the Doom Slayer looks down on a human corpse, gets enraged by it and [[ShutUpHannibal destroys the monitor]] Hayden's speaking on. This establishes the Slayer as a ruthless Badass NoNonsenseNemesis (to the Demons) who still retains some of his humanity.
** The Slayer seems to understand and respect authority. He could have done ''a lot'' more to [[spoiler:King Novik and the Betrayer]], who had both separately [[WhatTheHellHero called him out on his unyielding crusade against the demons, at the possible expense of everyone else]], beyond giving a mere DeathGlare in response. In addition, when he [[spoiler:beheaded Deag Nilox at the start of the game]], the Slayer adjusted the Hell Priest's crown, which became lopsided during the event, [[spoiler:possibly out of respect for who he once was, and all the help had given the Slayer when he was still Doomguy]]. Likewise, upon [[spoiler:spilling Deag Grav's blood on the arena floor of Sentinel Prime -- an act that costs the Slayer his sovereignty amongst the Sentinels -- and being faced with a squad of them]], he chooses to simply turn away and leave rather than wipe the floor with them.
** At the start of one of the later levels in ''Eternal'', the Slayer walks through a control room on Phobos filled with UAC employees. Everyone is spooked by his appearance, either looking on in shock or scrambling to get out of his way. One UAC employee has a keycard -- that the Slayer needs to access the inner parts of the facility -- on a lanyard hung around his neck; the Slayer takes the card (while it is still hung around the employee's neck) and uses it on the nearby control panel to open the door, dragging the poor fellow along by his neck in the process. In the next room, the Slayer stares down a UAC Marine -- who briefly admonished him for entering a restricted area before falling silent upon realising who he actually is -- before taking said Marine's plasma gun for his own use. Beyond mild discomfort, the Slayer clearly went out of his way to make sure he did not hurt any of the humans who saw him.
* EternalHero: He might have originally been [[spoiler:just a man]], but the Slayer has become the eternal bane of Hell itself, having torn his way through the demonic hordes for untold eons.
** Emphasized by King Novik's closing monologue at the end of ''Doom Eternal'':
-->''...And you will be their savior. Your strength will be their shield and your will... their sword. You remain... unbroken... for your fight is eternal.''
* EvilIsNotAToy: He is instantly disgusted and angry with the UAC for attempting to harness Hell to answer the energy crisis. The moment he gets his bearings and learns this, he already knows what went wrong, how it will escalate and the danger all of humanity now finds itself in. His attitude and actions show pretty clearly that he believes the UAC recklessly meddled in matters beyond their understanding or control. The consequences don't disprove this outlook, nor does the reveal of just where Argent Energy actually comes from in ''Eternal''.
** This becomes even more poignant when it's revealed in ''Eternal'' that [[spoiler:Argent D'nur collapsed because its people and the Maykrs grew addicted to Argent energy and made an alliance with Hell, betraying the Night Sentinels in the process]]. The Slayer knows ''exactly'' what the corrupting influence of Hell and Argent energy is capable of and doesn't want to see it repeated on Earth.
* TheExtremistWasRight: While Samuel Hayden only wants to temporarily shut down the production of Argent Energy, to avoid plunging Earth and its colonies into an energy crisis, the Slayer's respose to this proposal is to destroy the production of Argent altogether, by destroying the filters that alter the raw Hell Energy into Argent. [[TheCorruption Considering how easily the presence of Hell in any capacity can corrupt mortals]], as the [=UAC=] [[ApocalypseCult clearly demonstrated]], and considering the damage the Demons are able to do in such a short time if allowed, it's really, really hard to disagree with him on this one. The sequel lays the argument to rest once and for all by [[{{SoulPoweredEngine}} revealing the true nature of Argent Energy]], which even Hayden [[EveryoneHasStandards cannot tolerate.]]
* FaceDeathWithDignity: PlayedForLaughs - [[Film/Terminator2JudgmentDay his response to burning alive in lava is to give the thumbs up before sinking fully into molten slag.]]
* FeaturelessProtagonist: 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 [[https://www.reddit.com/r/Doom/comments/5l8p1o/doom_guys_face_doom_2016/ fans were able to rip]]. In-engine cutscenes that leave the Doom Slayer's perspective shows that his visor is more transparent, with his eyes becoming more prominent. In ''DOOM Eternal'', his face is far more visible, most notably when it's reflected in his visor after obtaining a power-up. In one cutscene, he is also shown without his helmet, at least from behind. [[spoiler:{{Averted}} come ''Eternal'', both because we see his face at several points, and because [[CanonCharacterAllAlong we've known what]] [[{{VideoGame/Doom}} it looked like since 1993]]]].
* FinishingMove: The Doom Slayer can do these to demons, something borrowed from the popular VideoGame/BrutalDoom GameMod. It's actually encouraged to do this, as enemies finished off with a "Glory Kill" are guaranteed to drop health pickups (and armour fragments, with a rune), and Glory Kills are the only way to finish off bosses.
* FragileSpeedster: With his DoubleJump and VideogameDashing, the Slayer is capable of zipping effortlessly around the map and dodging fireballs left and right. [[GlassCannon And not without good reason, since he can't tank very well at all despite his impressive damage output]].
* FromNobodyToNightmare: ''Twice.'' He went from [[spoiler:being a faceless UAC marine who was ReassignedToAntartica for refusing to fire on innocent civilians]] to one of the most relentless killing machines in gaming. His enemies - themselves being ''monstrosities who make the bogeyman cry for mommy'' - are absolutely terrified of him. This also applies to [[spoiler:his time in Argent D'Nur, where he rose from a nameless slave-soldier to become king of the Night Sentinels.]]
* GeniusBruiser: In addition to his enormous build, he's also well-read, an avid gunsmith, a capable leader of armies, and able to perform maintenance on an AI.
* GlassCannon: [[ZigZaggedTrope Comparatively at the very least]]. For all his demon-mauling bravado, and despite his ability to [[SuperStrength rip apart even the biggest demons around]], the Slayer can't take hits from those same demons very well. Virtually every hit from anything larger than an [[{{mook}} imp]] will take out a noticeable chunk of health, and the key to his survival thus [[FragileSpeedster lies in using his enhanced agility to bob and weave around them to avoid attacks]], and his ability to recouperate strength from [[YourSoulIsMine Glory Kills]]. The thing that makes it a ZigZaggedTrope is the fact that the Doom Slayer is at least capable of surviving a few hits, even from [[AttackOfTheFiftyFootWhatever titans]], where a normal human would just be reduced to paste, and judging by the ScarredEquipment that is his armor, he does get hit a lot. The codex entry on the Praetor suit even specifically mentions that it's essentially immune to conventional weaponry; it's just that the demons are using ''anything but.''
* GodzillaThreshold: Is the proverbial Godzilla for Samuel Hayden, as waking him from his [[SealedGoodInACan can]] leads him to destroying everything related or even concerning Hell, including [[spoiler:[[{{Unobtainium}} the extremely powerful Argent energy]] that the company had been exploiting Hell for]].
* GoodColorsEvilColors: His armour is a mix of earthy greens, greys and browns, compared to the demons' predominately red and yellow bodies that evoke fire and blood.
* GoodIsNotNice: Clearly on humanity's side, but due to a combination of dealing with people who screwed things up and being too deep into [[UnstoppableRage everlasting fury]] to care, the Doom Slayer is ''rude as hell''. He refuses to listen to people, his only forms of communication are {{Death Glare}}s and violence, and if you have something he wants, he'll just take it without asking.
* GrapplingHookPistol: In ''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 [[MeaningfulName "The Meat Hook"]].
* GrievousHarmWithABody: Some of the Glory Kills he can perform on his unfortunate enemies involve killing them with their own limbs or other body parts.
* GuestFighter: The Doom Slayer makes a playable appearance in ''VideoGame/QuakeChampions'', with alternative textures allowing you to make him look like his classic incarnation, his design from ''VideoGame/QuakeIIIArena'' or the Marine from ''VideoGame/Doom3''.
* HeWhoFightsMonsters: {{Defied}} - given he's running around in a suit of armour that feeds on Argent Energy, the same Hellish power that the [=UAC=] used to create its Possessed and Revenants, it is easy to think that the Doom Slayer is some kind of [[HumanoidAbomination demonic entity]] himself. [[spoiler: This is all {{jossed}} by a research log in ''Eternal'' stating in no uncertain terms that there is ''no way'' the Doom Slayer is a demon - his blood type is [[ABNegative AB positive]], and his genome confirms that he is human.]]
* HeroesPreferSwords: His WeaponOfChoice from Argent D'Nur, the Crucible, is a massive LaserBlade greatsword.
* HeroicBuild: Eons spent ripping and tearing through the forces of Hell has left him seriously ''ripped''.
* HeroicComedicSociopath: 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.
* HeroicMime: As usual, he never speaks - his actions tend to speak louder than words, though. However, pained grunts upon taking damage can be heard from in ''Eternal''. [[spoiler:Played with when {{Flashback}}s show him [[SuddenlyVoiced fully capable of talking, with a codex entry stating that he simply chose to stop speaking]], so in reality, he simply ''refuses'' to speak, given how dead focused he is on his work]].
* HeroicSecondWind: His extra lives mechanic in ''Eternal'' is described InUniverse as such - even after nearly being killed by a pack of demons, the Doom Slayer's forcing himself back up with pure anger and willpower to keep fighting.
* HiddenDepths: Especially considering he never says a word.
** While he's still a rampaging berserker, he shows 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 PlotArmor energy shield). He also hesitates to destroy [[spoiler:VEGA, a fully sentient A.I.,]] even though he knows it's necessary, and even ultimately makes a backup first.
** When tasked with taking out the Argent energy filters, he stomps them with his boot not out of ignorance or a lack of grace, but ''deliberately'' because of Hayden's insistence that they are to be treated with care - as destroying them will seal off any Argent energy supply for good - which is exactly what he wants. There will be consequences, yes, but for now stopping humanity's meddling with Argent energy takes priority or there won't ''be'' any humanity left.
** He's also surprisingly [[GeniusBruiser adept with technology]] (when he's not ''intentionally'' destroying it), given how long he may have 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.
** Albeit PlayedForLaughs and more likely considered as {{Easter Egg}}s, his Fortress of Doom in ''Eternal'' contains many trinkets that would be considered odd for a person with a single-minded dedication to demonic genocide, such as a bookshelf filled with literature on various topics ranging from Earth history to A.I. systems maintenance, several wall-mounted electric guitars (including one made out of ''argent energy''), his massive action figure collection, a tri-monitor desktop gaming system with subwoofers which also serves as his command console, [=an old IBM 486 computer=][[note]]which players can also use to run the [[GameWithinAGame classic Doom games]][[/note]], a skateboard[[note]]which is more of an in-joke referencing Doomguy's appearance in ''VideoGame/TonyHawksProSkater''[[/note]][[spoiler:and perhaps most tellingly, an [[CallBack empty rabbit cage]] with [[TragicKeepsake a single foot]] inside of it]]. Who knew the Slayer was a musician, avid gamer, and bookworm?!
* HopeBringer: Come the events of ''Eternal'', the Doom Slayer is a figure ShroudedInMyth to most of humanity, though his reputation and the tales of his exploits on Mars preceded him. The ARC and those living under its protection come to see him as a savior and protector, even if his violent tendencies do give them cause for concern. Regardless, his new conquests on Earth gradually emboldens the resistance and inspires hope into them, as they watch him wreaking havoc from afar.[[spoiler: He also became one to the people of Argenta as conscripts saw one of their own not only becoming a Sentinel but one of the best when it comes to kill demons. ]]
* HorrifyingTheHorror: Really driven home, 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.
-->'''Trailer:''' The only thing they fear... is you.
* HumanAlien: [[spoiler:{{Subverted}} as ''Eternal'' reveals that he's none other than ''[[CanonCharacterAllAlong the]]'' [[CanonCharacterAllAlong Doomguy from the original games]], having been found and taken in by the Night Sentinels after spending an unknown amount of time in Hell following the events of ''64''.]]
* HumanCannonball: In ''Eternal'', he loads himself into a futuristic cannon, in place of the spherical bomb that it'd normally fire, to launch himself through space and into an infested battle cruiser. [[https://gfycat.com/lamephysicaljaguarundi It has to be seen to be believed]].
* HumanoidAbomination: The Doom Slayer begins the ''2016'' game with strange runes etched on his hands, and he doesn't flinch when exposed to demonic energy for the sake of a buff. ''Eternal'' further reveals [[spoiler:he is in fact 100% human, with a blood type of AB positive and a perfectly normal genome... which makes his superhuman abilities and the unknown foreign bodies seemingly filling his body all the more inexplicable.]]
* HyperspaceArsenal: The Doom Slayer can carry up to nine guns at once, ranging from the humble combat shotgun to the all-obliterating {{BFG}}-9000, as well as his trusty chainsaw, a variety of grenades, and the almighty Crucible sword. And that's not even mentioning the wide variety of weapon mods which he pulls out of nowhere to swap around at a moment's notice, ranging from a sticky bomb launcher for the combat shotgun to an mobile turret and energy shield attachment for the chaingun. As such, though he appears to be carrying no more than his armour, a single weapon, his equipment launcher, and a BladeBelowTheShoulder, the Doom Slayer has a tool for virtually every type of demonic dilemma Hell throws at him within reach, and he is ''quick'' on the draw. At one point in ''2016'', he even stuffs an entire ''upper torso of a mangled corpse'' into his inventory to bypass a retinal scanner.
* IHaveManyNames: 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, the Scourge of Hell, the Great Slayer, [[spoiler: and, [[CanonCharacterAllAlong of course,]] Doomguy]].
* ILikeThoseOdds: Though it's a nonverbal version, it's very clear that the Doom Slayer does not care about being outnumbered. His response to being told that he is JustOneMan against millions, if not billions, of demons from TheLegionsOfHell, is to pump his shotgun with a determination that nonverbally screams "I call that a countdown" - and then get right into the thick of it.
* ImplacableMan: The Slayer cannot be reasoned or bargained with. He could at best be mildly slowed down and inconvenienced, by pitting him against innumerable hordes of demons, and he'd still be coming for your skin eventually.
* IncorruptiblePurePureness: 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.
-->'''Slayer's 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.
* InexplicablyAwesome:
** His ability to absorb strength from demons is never explained - he had it even before the Seraphim bestowed him SuperStrength and SuperSpeed. It's not something the Night Sentinels have either; they all had a DyingMomentOfAwesome each, so it's not related to them. [[spoiler: However, given that he had been absorbing trapped souls in the form of the Sphere powerups to strengthen himself as seen in [[VideoGame/{{Doom}} the previous games]], he might have simply figured out how to do so during his lengthy stay in Hell.]]
** His HyperspaceArsenal is never explained. How does it work? Who made it? Does it have a limit? The answer to all these has so far been a resounding ''[[NoPlotNoProblem "Who cares, just kill stuff with its contents"]].''
* ItsPersonal: [[spoiler:Even without the vendetta when he was just known as Doomguy, the demons still corrupted and slaughtered his comrades in the demon killing order of warriors, the Night Sentinels, and then destroyed his homeworld]].
* JerkassHasAPoint: Comes off as a more clear-cut WellIntentionedExtremist than Hayden, as he [[DoomedHometown knows from experience how much damage can be done if Hell is allowed to corrupt a society.]] [[spoiler:His point gets even stronger when you learn [[PoweredByAForsakenChild just how Argent Energy is made]].]]
* JerkassToOne: Right off the bat in ''DOOM (2016)'', he seems to develop an instant and almost unreasonable hatred for Samuel Hayden the second he hears that Hayden is the head of the facility. Almost every time he has to deal with Hayden, the Slayer will either violently cut off his transmissions, or deliberately smash the expensive stuff he's explicitly told to keep intact, as if to rub it into Hayden's face. On the other hand, once he figures out just what the UAC is up to, it makes total sense that he'd want to shut their operation down, [[spoiler: since he [[HumanResources already knows exactly what Argent Energy is and how it's made,]] and Hayden makes it very clear that shutting it down is not in the cards for him.]] ''Eternal'' shows that he's still more than a little contemptuous at Hayden; when recovering the doctor's shattered chassis, rather than carefully detaching it like the ARC scientist advises him to, the Slayer just nonchalantly yanks him out of his life support systems instead, which makes his entire chassis fall and slam resoundingly against the floor. As if that's not enough, as soon as the Marauder rocks up to the scene, the Slayer just casually flings what's left of Hayden into a portal without even looking.
* JerkWithAHeartOfGold: Being a person of unstoppable rage doesn’t 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. However he is predominately dealing with people who believed they could harness ''Hell'' as a power source without consequence. That said, he still cares greatly for the human lives lost, and he’s trying his best to ensure humanity’s survival.
* KnightInSourArmor: One interpretation of his behavior; he may not be the [[TranquilFury most calm]] or [[RoaringRampageOfRevenge peaceful]] person around, but he still fights for what he believes in and against Hell. His unbridled rage at the UAC 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.
* LanternJawOfJustice: At the start of ''Eternal'', the audience is given several good glimpses at his massive chin and squared, heroic jawline.
* LateArrivalSpoiler: A good two years prior to ''Eternal'', [[spoiler: his true identity as ''the'' Doomguy was first laid out explicitly in his ''VideoGame/QuakeChampions'' bio. However, this seems to be a case of CanonWelding, as ''Quake Champions'' wasn't considered to be fully canon when it comes to the bios of its {{Guest Fighter}}s.]]
* LegendaryInTheSequel: He's TheDreaded to the forces of Hell and demanding their full attention to stop [[OneManArmy him]] from [[SpannerInTheWorks halting their invasion]]. [[spoiler:Goes further since he's the original Doomguy, who was just one among the many marines in the older games.]]
* LightningBruiser: He's capable of outrunning virtually every demon and delivering punishing firepower while tearing them apart with his bare hands, 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".
* LivingLegend: 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 at least or outright shitting themselves at the very worst.
* MegatonPunch: In ''Eternal,'' he gains the "Blood Punch" ability, which allows him to deliver a supercharged punch that reduces ''anything'' standing in front of him that's weaker than a Hell Knight into red slop on the floor.
* MookHorrorShow: The Slayer's Testament, an account of the Doom Slayer's endless rampage against Hell, reads like a demon bedtime horror story. An unstoppable foe carving a bloody path through their forces with the wrath of the heavens itself. That is until confronted by Hell's mightiest champion, the colossal Titan. But even the Titan falls to the Slayer's might. The Testament's finale, when the demons seal their nemesis away because he could not be killed, still carries the implicit threat that one day: ''he might escape''.
* MultiMeleeMaster: Adept with a wide range of close-combat techniques and weapons, including his hands, feet, PistolWhipping, a forearm mounted blade, chainsaws, a giant laser greatsword, and even random dismembered demon body parts.
* MultiRangedMaster: General rule of thumb: If it can be used to kill, the Doom Slayer knows how to kill with it after a few seconds of inspection. He has used rocket launchers, miniguns, turrets, shotguns, pistols, plasma rifles, railguns, grenades, assault rifles, {{Swiss Army Weapon}}s, {{BFG}}s... the list goes on.
* MultipleChoicePast: In ''2016'', codex entries give few concrete facts about the Doom Slayer's origins, but plenty of WildMassGuessing fuel. Several references to the classic series enforce the fan theory that he's the Doomguy. 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. [[spoiler:''Eternal'' confirms both are true - he is Doomguy and the SoleSurvivor of the Night Sentinels]].
* NamesToRunAwayFromReallyFast: The demons, who call their forces "the slaves of Doom", have a name for him, too - the Doom Slayer.
* NeverHurtAnInnocent: Doom Slayer despises demons, Hell, and anyone collaborating with either. He'll kill anyone that's been corrupted and turned like the Hell Priests or the Mauraders. However, he's trying to save the earth as well and not just kill the demons after all, if he was only concerned with killing the demons he wouldn't go out of his way to [[spoiler:stop the Maykrs from sacrificing the earth.]] He's trying to save humanity while also waging war against Hell and any time he interacts with normal people, he may be rude and scare the shit out of them but he won't hurt them.
* NoNonsenseNemesis: A rare example where the protagonist is the nemesis. The Doom Slayer does not waste any time when it comes to dealing with his enemies; he dispatches them as ruthlessly and efficiently as possible. None of the Priests survive more than thirty seconds once he closes to quarters with them.
* NoSenseOfPersonalSpace: 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.
* NonstandardCharacterDesign: Despite the Slayer's Testament claiming "he wore the crown of the Night Sentinels", his armour 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 armour, the Doom Slayer'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.
* OffscreenMomentOfAwesome: During his rampage of Hell, he fought [[spoiler:a massive demon called the Titan, Hell's greatest champion, [[MonsterShapedMountain and now its massive skeleton litters the aptly named Titan's Realm region of Hell]]]].
* OlderThanTheyLook: 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." [[spoiler:Even if we assume he's from the current Earth's timeline originally, given ''Doom'' takes place in 2022 whereas ''2016'' is set in the year 2149, at absolute minimum, he's over 150 years old]].
* OmnicidalManiac: {{Downplayed}} - his adopted policy for demons is murdering them all, violently. If you're not that you're fine. If you are, then you won't be alive much longer once he catches up to you.
-->'''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.
* OneHitKill: The [[{{BFS}} Crucible]] blade in ''Eternal'' will one-shot any non-boss demon it hits. Even the likes of the [[BossInMooksClothing Tyrant]] or [[LightningBruiser Marauder]] will instantly fall to it (albeit impractical to perform in the latter case). The only exceptions to this rule are the Doom Hunters, which require two, one for each of their phases. The downside is that it only stores 3 charges at once, and charges are hard to come by.
* OneManArmy: ''Oh boy.'' This guy is possibly this trope ''distilled.'' For starters, he singlehandedly crushes the Mars invasion in a matter of hours almost entirely on his own, killing absolutely everything sent his way with extreme prejudice, including several of Hells strongest demons. This is pretty much taken UpToEleven in ''Eternal,'' as he's pretty much the sole effective soldier in the fight against a planetwide invasion from Hell.
* OnlySaneMan: It's quite clear he does not buy a single syllable of the shaky self-satisfied WellIntentionedExtremist 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.
* ThePaladin: He's the most exalted warrior of the Night Sentinels who are basically paladins [[RecycledInSpace but in another dimension.]] While he's a rather macabre take on this trope, he most certainly fits the general bill, what with his hatred for demons and his mission to repel the literal Legions of the Damned, in order to protect innocents from eternal damnation.
* PayEvilUntoEvil: The Slayer inflicts brutality and pain on the denizens of Hell on such a destructive scale that even they are horrified at his actions. His enemy knows no mercy or pity, so he offers them neither.
* PerpetualFrowner: Though he has a FaceFramedInShadow and HiddenEyes to emphasize ambiguity and a potential AudienceSurrogate, 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 KnightInSourArmor status and disgust for the forces of Hell.
* PerpetualMotionMonster: From the view of the demons at least - according to the Slayer's Testament, he has the ability to absorb the strength of the demons he slays, meaning he does not need to sleep, eat, or drink as long as he keeps on killing. His rampage has lasted ''ceaselessly'' throughout the eons, and it was only momentarily paused by collapsing a temple upon him and making him a SealedBadassInACan - once he escaped that, he got right back to killing demons without even a pissbreak.
* PersonOfMassDestruction: The UAC's [[GodzillaThreshold final failsafe]] in the case of a demonic invasion is not to nuke their facility, but to ''let the Doom Slayer out of his coffin''.
* PetTheDog:
** 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.
** [[spoiler: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.]]
* PhysicalGod: Played with - he's strong enough to rip apart demons that can shrug off rockets and ballistic slugs with his hands, can launch himself out of a railgun through the vacuum of space followed by the walls of a heavily armoured battle cruiser without any visible injury, and somehow even killed a [[AttackOfThe50FootWhatever Titan of Hell]], whose corpse forms the environment, ''before'' he gets the Praetor Suit.
* ThePowerOfHate: With a bit of GameplayAndStoryIntegration, the extra lives system in ''Eternal'' are {{Justified}} by his hatred for Hell being so great that, even if killed, he wills himself to live again out of sheer psychopathic hatred for the demons. Likewise, the health pickups are {{Justified}} by his willpower being restored with every demon he kills.
* PoweredArmor: His Praetor Suit, which was built/enhanced by a rogue demon to feed off Argent energy itself. On a more mundane level, it keeps track of his current vitals, provides a HeadsUpDisplay that feeds various info to the Doom Slayer, has a {{Comm Link|s}} system, and can integrate with external technology like VEGA.
* ProtagonistTitle: Appropriately, the protagonist of '''[=DOOM=]''' is called the '''[=DOOM=]''' Slayer. [[spoiler: Taken to [[ExaggeratedTrope exaggerated levels]] in ''Eternal.'' In her final audio log found in the Arc Complex level, Dr. Elena Richardson begins to worship the Slayer as a messianic figure, outright declaring him to be more than just a man, and that "he is DOOM."]]
* RealMenWearPink: Despite being an incredibly intimidating killing machine built like a Belgian Blue, his collectibles are an ever expanding SuperDeformed action figure collection of himself and his enemies. He also owns a number of ''Doom'' universe versions of ChildrensLiterature (like ''Literature/TheVeryHungryCaterpillar'', ''Literature/GreenEggsAndHam'' and ''Literature/TheGivingTree''), {{Romance Novel}}s, (like ''Literature/FiftyShadesOfGrey'' and ''Film/EatPrayLove'') and self-help books (like ''Literature/HowToWinFriendsAndInfluencePeople''). With the Doomicorn skin or any variant thereof, he can quite literally wear pink.
** [[spoiler:With the reveal that this Doom Slayer is indeed the original Doomguy, it confirms that he used to keep a pet rabbit named Daisy. Doom Slayer also wrote a book called "My Best Friend Daisy".]]
* RebelLeader: According to the Codex, when the Night Sentinels started a civil war after discovering [[spoiler: the true origin of Argent Energy]], the Slayer led those who sided against the Khan Maykr, and was actually ''winning'' until the Betrayer sold them out.
* {{Reconstruction}}: Of the SuperSoldier trope - anyone who managed to become a OneManArmy who tore through TheLegionsOfHell with an unexplained HyperspaceArsenal of guns wouldn't just be considered some random {{Mook}} for long. From the start of ''2016'', the PlayerCharacter is already LegendaryInTheSequel, ShroudedInMyth, and considered to be TheScourgeOfGod to the demons. In other words, he's become to them what Hell is for humanity.
* RedBaron: The demons refer to him as the "Doom Slayer".
* TheReveal: During the Sentinel Prime level of ''Eternal'' it's revealed [[spoiler:he is in fact the Doomguy from the classic games who willingly remained in Hell at the end of ''Doom 64'', only to somewhere along the line in his eons of battle end up in a portal leading to Argent D'nur.]]
* RoadRunnerPC: One of the Doom Slayer's greatest strengths (second only to his SuperStrength) is his incredible vertical and lateral movement - It allows him to keep his engagements to the range that is most effective at dealing with the individual foes, dodge projectiles and {{Ground Pound}}s and then close in for a Glory Kill once an opportunity presents itself. A double jump and a short-range borderline FlashStep doesn't seem like the most useful abilities when staring down the demonic hordes, but one of the reasons marauders are such absolute ''[[DemonicSpider bastards]]'' to slay is because ''[[EvilCounterpart they can keep up]]''.
* RoaringRampageOfRevenge: He ''[[UnstoppableRage 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 ''[[HorrifyingTheHorror in fear]]'', and only ends when they manage by luck on their part to seal him away. And that only bought them time. [[spoiler:In ''Eternal'', it's learned that this unrelenting rage stems from being betrayed by the Deagic Council, who pretended to be on his side and the side of the Night Sentinels, but who used their evil magic to scatter them and leave them all to die at the hands of the ravening demons, on top of losing his second home]].
* TheScourgeOfGod: 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 SuperStrength from [[OurAngelsAreDifferent "seraphim"]], implying that he may have literally been given his mission by God.
* {{Sadist}}: Rather than going straight to the kill, if he gets his hands on a demon, he will gruesomely mutilate it [[NotSoDifferent just as the demons would do with him]].
* ScrewTheRulesImDoingWhatsRight:
** The Slayer is told several times in ''Eternal'' that killing the Hell Priests is an unforgivable violation of Night Sentinel law. Considering that the Hell Priests are trying to help Hell consume Earth's people, the Slayer does not once give a crap about what the other Sentinels think; even after being told that [[spoiler:killing Deag Grav within the borders of Sentinel Prime will cause him to completely lose his status among the surviving Night Sentinels, the Slayer unhesitatingly blows his head off with the Super Shotgun anyways; when a group of Sentinels arrive to apprehend him, he only stays long enough to give them a rather contemptuous look before leaving through a portal]].
** The Khan Maykr is rather aghast that the Doom Slayer would willingly defy millennia of tradition to foil Urdak and Hell's attempt to consume most of humanity. Again, the Slayer doesn't give a crap about this; screw tradition, he's going to save humanity anyways.
* SealedGoodInACan: Started off as this before the events of the game - the Demons, realizing that nothing they could throw at him [[WhyWontYouDie would kill him]], opted to instead bury him under one of their temples by collapsing it on top of him, then binding the rubble into a sarcophagus and sealing it with every damn ward they had. When the UAC found his coffin, the demons fought like they had never fought before to keep them from taking it - and with good reason: Less than five seconds after being awoken, The Doom Slayer is already killing possessed with his bare hands. [[spoiler:Hayden then BookEnds the game by sending the Slayer ''somewhere'' (no doubt with the ability to recall him, should things to south again) via the Tether system]].
* ShellShockedVeteran: [[ZigZaggedTrope For a while, anyway]]. [[spoiler:Fighting the hordes of Hell really did a number on his psyche, as shown by a flashback to the time he was Doomguy. By the time the Night Sentinels rescued him, he was reduced to a babbling wreck who sounded like he'd used one too many berserker packs, only speaking of demon genocide. And guts. [[AscendedMeme Huge guts]]]]. By the time of the games, however, we have yet to see any sort of shell shock from him, implying that he has either moved past it, [[spoiler: the divinity machine purged it]], or he keeps it ''very'' well hidden beneath his TranquilFury.
* ShoulderCannon: The Doom Slayer's upgraded Praetor Suit in ''Eternal'' now sports the Equipment Launcher on the left shoulder - a mulipurpose ordinance delivery system capable of firing off a short-ranged Flame Belch, Frag Grenades and Ice Bombs.
* ShutUpHannibal: He deals with anyone who tells him he can't do what he's doing by making it ''violently clear'' that nothing will stop him.
** [[spoiler:When Deag Grav tells the Slayer that he can't kill him on sacred ground, the Slayer just shoots the Priest's head off]] .
** Both Novik and the Betrayer separately attempt to convince him that he can't stop the Khan Maykr alone; his response is to completely ignore them after a brief DeathGlare.
** Deag Ranak [[spoiler: attempts to bargain with him, [[WeCanRuleTogether offering him power and assistance in exchange for his life.]] He doesn't even finish the offer before having his head lopped off by the Doomblade.]]
* SilentSnarker:
** ''Eternal'' reveals that, [[spoiler:as Doomguy, he was at least capable of speaking (although by the time the Maykrs found him, he was more or less reduced to reciting his MadnessMantra)]], but in the present-day, the Slayer does not speak a word, although he still grunts when hit. His actions and facial expressions basically do all the talking, such as him visibly having no patience for Samuel Hayden's tendencies to exploit Hell for resources and ForScience, and killing the Hell Priests mid-sentence. [[spoiler:According to the codex, he is still capable of speaking, but simply chooses not to.]]
** In ''Eternal,'' if you've run out of ammo for a gun and try to switch back to it, he takes out his chainsaw to silently remind you of how reloading works.
* SleevesAreForWimps: By the events of ''Doom Eternal'', the bicep armour on his Praetor Suit has been removed, revealing his gigantic muscles. Lampshaded as the description for the Original suit from 2016 is labeled "concealed guns".
* SoleSurvivor: Regardless if he's from an AlternateUniverse Earth or Argent D'Nur originally, the Doom Slayer is this UpToEleven: 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. [[spoiler: [[SubvertedTrope Then it turns out there are surviving Night Sentinels.]] Unfortunately, [[FaceHeelTurn the ones that survived are working with the Hell Priests.]]]]
* SoulEating: [[spoiler:As revealed in ''Eternal'' that Argent Energy is made from the souls of those killed by Demons, him absorbing the Argent Energy Cells for power means that he's been consuming the souls of the other victims of Hell.]]
* SpaceMarine: Despite his MysteriousPast, his pressurized PoweredArmor and records of his campaigns across the plains of Hell got him the moniker "the DOOM Marine" from the UAC researchers who studied him. [[spoiler:In ''Eternal'', it's revealed that he was once Doomguy, the lone human space marine who killed his way through legions of demons even ''before'' becoming a Sentinel]].
* SpannerInTheWorks: The empowering he underwent by the Seraphim as described in ''DOOM''? [[spoiler:That was actually one Maykr [[DefectorFromDecadence going against the Khan's wishes]] to create a reserve back-up plan in case things went sour. The Khan Maykr was displeased with this and exiled the Seraphim, but kept the Slayer around until he too [[YouHaveOutlivedYourUsefulness was in the way of her plans with Hell.]] What she didn't count on was his absolute refusal to die, which resulted in a long-term destruction of her plans from the inside-out.]]
* SpellMyNameWithAnS: Is it "Doom Slayer", with a space, or "Doomslayer", all one word? Official materials largely use the former, but the latter has also been used, so it seems either is permissible. [[spoiler: Not unlike how older instances alternate between the fan-ascended nickname of "Doomguy" and the nondescript "Doom Marine".]]
* SuddenlyVoiced: He gets a voice in ''Eternal'', but only for grunts of pain when he gets hit. Naturally, it's incredibly deep and guttural. [[spoiler:However, {{Flashback}}s to his first arrival on Sentinel Prime later in the game reveal he was perfectly capable of speaking, but was [[AxCrazy rapidly losing]] his mind by the time the Sentinels found him, and seems to have stopped speaking altogether by the time the Seraphim empowered him through the Divinity Machine]].
* SuperSoldier: When the Night Sentinels first find him, he is merely a BadassNormal who [[spoiler:took on Hell's armies by himself for decades]]. After some time spent training with them, he rises to become one of their best warriors, but when [[spoiler:the Seraphim imbues him with the power of the Maykrs]], he becomes far greater than any human or Sentinel.
* SuperStrength: He's strong enough to liquefy a zombified human's skull with just one hand while shackled to a table, rip off the limbs off bullet resistant demons, and tear apart pieces of metal equipment and armour with just his hands and feet.
* SuperSpeed: ''Very'' {{downplayed|trope}} compared to some of the other speedsters in fiction, but between his ability to DoubleJump, FlashStep / VideogameDashing, his [[PerpetualMotionMonster enduring stamina]], it's hard to argue that his mobility isn't beyond human.
* SuperToughness: The Slayer can survive being shot out of railguns like a human bullet, straight into the wall of a building with enough force to shatter the wall and break through, and only needing a second afterwards to resteady himself. This same toughness also allows him to take hits that would reduce a normal human to paste, even if [[FragileSpeedster he's much better served dodging the hit instead]].
* TalkToTheFist: In ''Eternal'', this is how he deals with the Hell Priests. When they're extolling the power of Hell or how they're supposedly untouchable, the Slayer shows how wrong this assumption is by attacking them mid-sentence. [[spoiler:He tears off the first Priest's head with his bare hands, cuts off the second Priest's head with the Doomblade, and shoots the third one point-blank in the face with his Super Shotgun]].
* TeethClenchedTeamwork: 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.
* TerrorHero: By the events of ''Doom Eternal'', his mere presence cause any human in the vicinity to visibly tremble 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 DeathGlare at the poor guy. Except for the guy at the ARC Complex though, who looks up to the Slayer like a fanboy rather than overtly terrified of him.
* TimeAbyss: The Slayer's Testament claims that no one even knows how long he's been slaughtering the forces of Hell, but his name is etched across the demons' history for '''eons.''' (An eon, in scientific terms, equals to a billion ''years''.)
* ToHellAndBack: He goes to Hell and back three times that the player can see (when Olivia opens the portal at the Argent Tower, to retrieve the Crucible, and then to shut down The Well), and is said to have done it at least once before, which is how he became [[TheDreaded so damn scary to the demons]].
* TookALevelInBadass: Not that he wasn't already awesome from the start, mind you, but the collected lore in ''Eternal'' states that [[spoiler:his Night Sentinel training and Seraphim enhancements turned him from the "brutal, but crude" Doomguy to the Great Slayer, the greatest Sentinel to ever live]].
* TooSpicyForYogSothoth: He's gone to Hell multiple times and broke out every time (the ending crawl from the original game even says he's "too tough for Hell to contain") It gets to the point where the demons are [[HorrifyingTheHorror downright scared of him and try hard to keep him OUT of Hell.]]
* TouchedByVorlons: According to the Slayer's Testaments, he was granted superhuman abilities from the "Seraphim" ([[spoiler:revealed in ''Eternal'' to be one of the Maykrs]]).
* TraumaButton: The Slayer is extremely traumatized at the mere thought of demons and any he even thinks, sees, or hears about one of their kind he will let loose all of his rage.
* TranquilFury: 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'' pissed. In ''Eternal'', only the part of his face visible through his visor is his eyes, which are locked in a permanent, enraged DeathGlare. His state as this is especially pronounced when [[spoiler:his present-day silence is put into direct contrast against his gibbering mania when he was first found by the Night Sentinels]].
* UnscrupulousHero: He is extremely violent and committed to his goals of eradicating the demons above all else, but his reactions to dead civilians and his treatment of VEGA indicate his moral compass is quite functional.
* UnstoppableRage: He is the SoleSurvivor 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.
* UnwittingInstigatorOfDoom: In ''Eternal'', it's revealed [[spoiler:that as the original Doomguy, he was brought to the Night Sentinels maddened and delirious, constantly rambling about the demons he's fought for so long. It's because of this that the Maykrs grew interested in finding said demons, and corrupted the Sentinels with the promise of Argent Energy once they found them, which ultimately ended up with the events of ''2016'' and ''Eternal'' unfolding. The Slayer isn't simply destroying the UAC's Argent Energy out of hatred for Hell, he's preventing the same mistake from happening ''again'', to his own people]].
* WalkingArmory: {{Downplayed|Trope}} come ''Eternal'', he gets a shoulder-mounted cannon capable of firing several types of munitions, and the Doomblade attached to his left wrist - the rest of his equipment are still stored in a HyperspaceArsenal.
* VoiceGrunting: In ''Videogame/DoomEternal'', the Slayer makes grunts of pain whenever he takes damage. He's otherwise still presented as a SilentProtagonist.
* WeaponOfChoice: If both covers of the game are anything to go by, the Doom Slayer's weapon of choice is the double-barreled Super Shotgun. Both this and the regular Combat Shotgun are mainstays in the Doom Slayer's arsenal.
* WellIntentionedExtremist: 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 [[{{Unobtainium}} 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. Come ''Eternal'', he's [[HellOnEarth proven right]].
* WhatMeasureIsANonHuman: As far as we know, he's never killed another human being. It's open season on everything else, however.
* WorldsStrongestMan: To quote Samuel Hayden:
-->'''Hayden:''' "The Slayer has ''no'' equal"
* WorthyOpponent: It's clear from the tone of the ''Slayer's Testament'' recordings found in Hell that, as much as the demons might fear and loath him, they hold the Doom Slayer in [[FameThroughInfamy a twisted kind of respect]] for the [[AdmiringTheAbomination pain and destruction he brings]], even [[PayEvilUntoEvil if it's directed at them]].
* WouldHitAGirl: Several of his opponents (namely, Whiplash demons, Spider Mastermind and Khan Maykr) are female, yet he will rip and tear them just like any other enemy of his.
* WouldNotShootACivilian: 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 [[TheDreaded over him]]) and doesn't hurt a hair on any of their heads even if he's more than a little disrespectful with them. Not that this extends to any DemonOfHumanOrigin though - it doesn't matter what it was, even if it was a civilian; if it's a demon now, it's dying. [[spoiler: [[{{VideoGame/Doom}} In fact, his entire crusade against Hell began because he assaulted a superior officer who ordered him to kill civilians.]]]]
* YourSoulIsMine: He is able to absorb strength from the fallen demons, [[GameplayAndStoryIntegration which, in-game, is represented through the glory kill system]].
* ZeroApprovalGambit: In ''Eternal'', [[spoiler:before the Gladiator boss fight in Sentinel Prime, Deag Grav informs the Slayer that if he kills him as he did the other Hell Priests and thus spills Sentinel blood within the city, he'll lose all of his sovereignty and respect among the surviving Night Sentinels. The Slayer isn't fazed by this and, in the aftermath of the fight, kills him anyway with a Super Shotgun blast that blows his head into chunks. As soon as this happens, several Night Sentinels run into the arena he's in, slowly inching closer towards him as their now red-tipped spears point in his direction-- a clear sign that they no longer tolerate his presence. The Slayer simply leaves, no doubt believing that putting a dent in Hell's invasion of Earth was well worth the cost of his good will with the Sentinels]].
** [[spoiler: However, given that these are the same Night Sentinels who willingly sided with the Khan Maykr even after learning of her pact with Hell, it's likely that he doesn't really care if they respect him or not]].
[[/folder]]

!UAC
[[folder:In General]]
The Union Aerospace Corporation, a MegaCorp whose research into Argent energy ended up unleashing demons from Hell then later HellOnEarth.
* EvilInc: Zig-zagged. The company's Mars division was overrun by cultists that worship Hell, and are trying to bring the infernal hordes through to Earth. This corruption reaches into the company's uppermost brass. However, enough of the UAC remained on Humanity's side that, come ''Eternal'', the company's corrupted parts are referred to explicitly as a seperate "cultist division," with the rest of the UAC helping to form [[TheAlliance the backbone of the Armored Resistance Coalition.]]
* NGOSuperPower: Having effectively monopolized humanity's energy industry prior to the events of ''2016,'' they have more influence on global affairs than most ''governments'' do. This winds up biting Humanity in the ass when the company is infiltrated by insane cultists.
* PoliticalCorrectnessGoneMad: They would appreciate it if you called the demons the "mortally challenged".
[[/folder]]

[[folder:Samuel Hayden]]
!!!'''Voiced by:''' Creator/DarinDePaul

[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/samuel_hayden_2.png]]
[[caption-width-right:250:''"I am not the villain in this story. I do what I do because there is no choice."'']]

->''"I'm willing to take full responsibility for the horrible events of the last 24 hours, but you must understand - our interest in their world was purely for the betterment of mankind. Everything has clearly gotten out of hand, yes, but it was worth the risk. I assure you."''
\\
Dr. Samuel Hayden is the chairman 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.
----
* AffablyEvil: 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.
* AmbiguouslyHuman: Despite his past as a flesh and blood human, there's something ''off'' about both his mannerisms and his speech patterns. Come ''Eternal'' [[spoiler:he has suddenly gained complete knowledge about the Sentinels and the Maykrs, and now calls humanity 'your people' when talking to the Doom Slayer, implying that he doesn't count himself among them. The game also reveals the "Seraphim" who gifted Doomguy great strength and speed sounds exactly like Hayden and even uses the same lines when empowering the Slayer as when Samuel gave Doomguy his first argent energy cache on Mars. Further, Samuel's robotic body is revealed to be utterly "alien" in design, and it was shown to be sufficiently similar to the Doom Fortress's system in order for him to [[SentientShip transfer his consciousness into it]]. [[ArsonMurderAndJaywalking also,]] He and the Maykrs both refer to their separate Hell energies as Argent Energy, despite having little to no contact with each other directly. Whether this means Samuel was replaced by the Seraphim at some point, or is slowly being [[DemonicPossession possessed]] by him, or something else entirely, is left unclear, however.]]
* AuthorityEqualsAsskicking: 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 a trip to Hell and back. In ''Eternal'', it's revealed that he personally led the forces of humanity in battle wielding the Crucible, though this worked out less than perfect.
* BadassBaritone: His deep voice has drawn more than a few comparisons to Creator/PeterCullen's take on [[Franchise/{{Transformers}} Optimus Prime]].
* BadBoss: It's not clear how much of a hand he had in drafting the UAC's more sinister policies on Mars (a seven-day workweek, deliberately sacrificing workers to demons simply to acquire better data, etc.), but it's implied that he at least willingly turned a blind eye to it. Even during the Mars outbreak, he is rather cavalier about the deaths of his employees, admitting responsibility but expressing zero remorse, as he deems the UAC's energy extraction WorthIt.
** [[EveryoneHasStandards To his credit]], [[spoiler: he does draw the line at the industrial-scale planetary genocide that is required to create Argent Energy in the first place.]]
* BigGood: Hayden becomes the de facto leader of [=ARC=], leading the resistance against the demonic invasion. His continuous efforts in trying to stop the demons make him a LivingLegend for many survivors.
* BrainUploading:
** After being diagnosed with cancer, he had his frontal and temporal lobes transferred into a cybernetic body, retaining his personality, memories, reasoning, and comprehension. [[spoiler: At least, [[AmbiguouslyHuman that's the official story]]]]
** [[spoiler:Sort of gets this again in ''Eternal'', transferring his consciousness out of his destroyed body and into the Fortress of Doom.]]
* CyberCyclops: 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.
* DeadpanSnarker: Upon telling the Doom Slayer to head towards the research complex to retrieve [[spoiler:The Helix Stone]], he drops this line:
-->'''Samuel:''' Your affinity for guns is apparent... I'm confident you'll find [[{{BFG}} something useful]] there as well.
* DeflectorShields: His cyborg chassis has very powerful energy shields that prevent the Doom Slayer from simply shooting him on sight. Sadly, come ''Eternal'', this [[HalfTheManHeUsedToBe proved insufficient]] to protect him from an extended fight with TheLegionsOfHell.
* DoesNotLikeGuns: Subtly implied. Hayden never uses guns himself, even when journeying into Hell, and emphasizes the word "guns" when talking to the Doom Slayer as if it's beneath him even to speak the word. The codex seems to imply he wielded the Crucible sword rather than use any firearms when fighting the demons on Earth.
* EmergencyTransformation: 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.
* EvenEvilHasStandards: Not exactly "evil" so much as "morally questionable to a dangerous degree". While initially, he refuses to give up on Argent energy as he sees it as an important resource, regardless of where it comes from, [[spoiler:in ''Eternal'' he learns or perhaps remembers, that Argent is quite literally the tortured, broken souls of Hell's victims, cruelly distilled into refined energy by merging it with the "holy" energy of the Sentinels by the Maykrs. After that, he couldn't suffer it to exist any longer, and codex tabs reveal that he had been trying to research a way to create a synthetic Argent Energy using the Demonic Crucible to remove Earth's connection and dependence to Hell.]]
* FourFingeredHands: His new body was built with only 8 digits.
* FrontlineGeneral: After the demonic invasion of Earth, Hayden assumed control of the remnants of humanity's military forces, and personally led a massive counter-attack which was supposed to turn the tide of the war. Unfortunately, the attack failed and Hayden's robotic body was torn apart during the fighting.
* GodzillaThreshold: Waking up the Doom Slayer. Hayden is well aware the Slayer 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.
* HalfTheManHeUsedToBe: He suffered heavy damage during a decisive battle against the demons on Earth. When you meet him again in ''Eternal'', all that's left of him is his head, upper torso, and left arm.
* HazyFeelTurn: [[spoiler:In ''Eternal'', he clearly has changed his stance on controlling Argent and aids the Slayer in ending the invasion of Earth once and for all, but his overall opinion of the Slayer and subsequently his actual agenda past the invasion remains up in the air by the end of the game.]]
* InsufferableGenius: He has a very high opinion of his intellect and believes he can harness the powers of Hell for the good of humanity without falling to Hell's influence. He's not entirely wrong, but, [[TheCorruption unfortunately, the rest of the UAC was less resilient.]]
* IronicName: [[spoiler:Despite his name being {{Satan}}-like, he is strongly opposed to letting the demons conquer our world, even as he draws from theirs to stop an energy crisis and becomes appalled after learning where the energy he sought comes from.]]
* LargeAndInCharge: His body was specifically built to be 3 meters tall, and he leads the UAC. One codex entry mentions him exploiting it, as the lever that sends Argent Energy to Earth is big enough that only he can pull it, and uses this to forcibly make sure he can never be pulled away from his position.
* {{Leitmotif}}: Every time that Hayden appears, a song with high usage of industrial EDM sounding music plays.
* LaserGuidedKarma: [[spoiler:In ''Doom VFR'', he deletes protagonist Abraham Peters' consciousness so he doesn't cause any more "problems". Come Eternal, by the time the Slayer encounters Hayden's remains, he is torn in half with his left arm missing--the exact same kind of damage Peters' corpse sustained in ''Doom 2016'' and ''[=VFR=]''.]]
* LossOfIdentity: It's ambiguous just how much of [[spoiler:the human Hayden is left, and how much of him was subsumed by the Maykr technology he used to build his robotic body. His mannerisms in ''Eternal'' are noticeably different from how he acted in ''2016'', he's undergone a complete 180 on using Argent Energy, and he displays a thorough knowledge of some topics that Hayden should have never known about.]]
** [[spoiler: This, of course, assumes that Hayden was ever human in the first place, as there is strong evidence that indicates that Hayden is really Samur, the Maykr seraphim who first empowered Doomguy in Taras Nabad. ]]
* MeaningfulName: [[spoiler:Samuel Hayden > [[LouisCypher S. Hayden]] > {{Satan}}, meaning someone who turned against Heaven. However, as ''Eternal'' shows, this just means he's ''more'' trustworthy, given "Heaven" is in league with Hell. It could also point to his potential past as a fallen angel of sorts, not unlike some depictions of Satan.]]
* MissionControl:
** He's the one who gives the Doom Slayer directions on what to do, though the Slayer's willingness to actually follow through on said directions varies from time to time.
** [[spoiler:Returns as the MissionControl for the final half of ''Eternal'' alongside VEGA, up until the assault on Urdak anyway, subsequently leaving Hayden as the Slayer's last remaining ally for the remainder of the game.]]
* MorallyAmbiguousDoctorate: 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 behaviour and development of "battle demons" were allowed to proceed with his knowledge and/or blessing. [[spoiler:He comes back from the brink in the final act of ''Eternal,'' after realizing (or rather revealing) just where Argent [[SoulPoweredEngine actually comes from]], it's too abhorrent for even ''him'' to consider, and he squarely sides with the Slayer insofar as it has to go -- ''all'' of it.]]
* MysteriousPast: There is little debate that Samuel Hayden was one of the brightest minds of the UAC, and that after being diagnosed with a terminal illness he transferred the healthy parts of his brain into a massive robotic body. This is where things get hazy; there are several ''suggestive'' things about him, such as [[spoiler:the similarities to Samur the Seraphim, right down to similar lines and the same voice actor, and the fact that his robotic shell is noted to be "alien" in design and capable of interfacing with the Maykr/Sentinel-designed Fortress of Doom seamlessly. Whether from the Fortress and Codex or from personal knowledge, he also seems to know just about ''everything'' involving the Sentinels and the Maykrs, including the truth of how Argent energy is made.]]
* MrExposition: Hayden turns into this for the later parts of ''Doom Eternal'' where he frequently explains to the Doom Slayer plot-related fact and other lore. [[spoiler:This includes information he couldn't ''possibly'' know if he were a normal human being or even a Night Sentinel, giving hints to his own identity in the course of the exposition itself.]]
* NighInvulnerable: The only other human besides the Doom Slayer to make it back from Hell and without a gun to defend himself. Being a cyborg with an energy shield, not much could scratch him.
* NoSell:
** 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.
** He's also the only person besides the Doom Slayer who is shown to suffer no ill effects from direct exposure to Hell and Argent energy (due to being in an inorganic cyborg body).
* NotMeThisTime: You might be quick to assume that Hayden's continued experiments with the Demonic Crucible after the events of ''Doom 16'' were responsible for the invasion of Earth shortly thereafter. Surprisingly, this is not the case; the invasion was a pre-planned event orchestrated by the Khan Maykr and her Hell Priests. In fact, it was one of these priests, Deag Ranak, who drove Olivia Pierce to develop a Hell cult on Mars in the first place.
* NotSoDifferent: To the Khan Maykr. [[spoiler:They both face the same crisis: their worlds are dying, they need energy, and Argent is a solution that won't only save their worlds but put them firmly back in the black. The trouble is, Argent requires continuous genocide on an intergalactic scale to sustain. While Khan Maykr's more than happy to walk that line, Hayden ultimately can't bring himself to cross it.]]
** Furthermore, [[spoiler:Hayden may be literally part Maykr (if not completely); that is, the cybernetic portions of Hayden's brain are implied to be derived from their technology. ARC scientists couldn't figure out how to access his cortex and described it as "alien", and he was able to transfer himself into the Fortress of Doom's systems (which are of Maykr design) because they have similar digital architecture. Not to mention his thorough knowledge of Nekravol, Urdak, and the history of Argent energy, which a human could not possibly have access to.]]
* NotSoSimilar: [[spoiler:There is an important difference between him and the Khan Maykr, though; he has empathy and moral boundaries even he will not cross. He will ''not'' allow Earth to become just as much of Hell's co-conspirator as Urdak is, and will ''not'' allow any more worlds to suffer for Argent energy.]]
* NotSoStoic: Noticeably loses his cool once the Doom Slayer starts destroying the Argent Energy filters. As this goes on, this gives way into TranquilFury.
-->'''Samuel''': You must stop. ''The Hell energy is'' '''''unusable''''' ''without the filters!''
* OOCIsSeriousBusiness: He rarely shows emotional inflection in his voice, aside from some brief exasperation at the Doom Slayer's more destructive actions. But after learning about [[spoiler:how Argent Energy is made, he sounds noticeably more disturbed and upset]].
** Furthermore, while describing [[spoiler:the process of producing Argent Energy]] to the Doom Slayer, he doesn't just sound upset; he's downright ''seething,'' his voice dripping disgust and fury, using emphatic language completely at odds with the clinical, detached language he employed in ''2016''.
* PetTheDog: 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 [[spoiler:Vega]] after the latter pull a HeroicSacrifice. In the sequel, he has enough empathy to be audibly ''furious'' while he describes [[spoiler:how Argent Energy is made.]]
* Really700YearsOld: Thanks to his Argent-powered cybernetic body, he's practically immortal. He's over 130 years old by the events of the game. [[spoiler:If he's really Samur, [[TimeAbyss he's been around for a ''lot'' longer than that.]]]]
* ReasonableAuthorityFigure: Relatively speaking, when compared to Olivia and ''especially'' the Khan Maykr. He seems to be the only person in the UAC who realizes how much Olivia has been corrupted by Hell and recognizes that a full-on demonic invasion is not a good thing. If he had recognized the immediate threat Olivia posed to the UAC Mars installation, the initial Martian invasion could have been prevented. Furthermore, [[spoiler: after discovering the true nature of [[SoulPoweredEngine Argent Energy]] he forsakes it all together, and instead turns to develop a synthetic alternative to Argent, all the while leading the ARC against the demonic invasion on Earth.]]
* RedBaron: According to the ''DOOM Eternal'' Collector Edition's Lore Book, he's known and reviled by the demons as the "Lucent Defiler".
* SapientShip: [[spoiler:In ''Eternal'', he becomes integrated into the Fortress of Doom and more or less serves as the ship's ComputerVoice alongside VEGA, even replacing it once it removes itself from the system.]]
* StraightMan: [[spoiler:Plays this role in contrast to the Slayer's BloodKnight tendencies and VEGA's complacency in ''Eternal'' once he's brought back into the fold, occasionally baffled by the Slayer's... ingenuity in stopping the invasion, though he's as deadpan as ever.]]
-->'''Samuel:''' [[spoiler:You can't just shoot a hole into the surface of Mars...]]
-->'''Mission Objective:''' [[spoiler:[[NotHyperbole Shoot a Hole in Mars]].]]
* TeethClenchedTeamwork: 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'.
** This is downplayed considerably come ''Eternal'', as Hayden has gotten on the same page with the Slayer on [[KillEmAll the correct stance to take regarding Argent and Hell]]. He still expresses exasperation with the Slayer at times, such as when he commandeers the BFG 10k to [[EarthShatteringKaboom blow a hole in Mars]] to access the slipgate in Hebeth quicker.
* ThisIsUnforgivable: [[spoiler:After learning what Argent energy was, even ''he'' was so disgusted he promptly swore it off forever and promptly starts plotting to kill the Khan Maykr for her absolute selfishness.]]
* TranquilFury: As the Doom Slayer destroys the Argent energy filters one by one, he becomes increasingly stressed in his otherwise collected tone of voice. By the time the Slayer gets to the third and final filter, Hayden finally lets loose and gives him a WhatTheHellHero ramble:
-->'''Samuel:''' If stopping our energy production is what you want, then you need '''only''' to destroy this last filter, and Argent energy will no longer exist in this solar system... We will be back at square one.\\
''(The Doom Slayer hesitates for a moment, takes a glance at the [[EvilTowerOfOminousness Argent Tower]], then pulls his fist back and destroys it)''\\
'''Samuel:''' [[WhatTheHellHero You have no idea what you have just done]].
** Later in ''Eternal'', he shows thinly-veiled resentment at [[spoiler:Khan Maykr and [[PoweredByAForsakenChild her methods in creating Argent energy]], as well as the lengths of her desperation to keep her power by any means necessary, even allying with Hell and damning countless worlds to oblivion]]. It is a key development that contrasts his own prior behaviour that made him almost NotSoDifferent to the [[spoiler:Khan Maykr]].
--->'''Samuel:''' It is an unholy union and cannot stand any longer.
* UtopiaJustifiesTheMeans: 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, [[spoiler: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]].
** [[spoiler:Finally averted in ''Eternal''. When Hayden learns [[PoweredByAForsakenChild the true source]] of Argent Energy, he decides that it's no longer worth using and aids the Doom Slayer in crippling the source, all the while researching a way to synthetically replicate it using the Crucible as an "Argent Conductor"]].
* VillainRespect: Well, [[WellIntentionedExtremist not exactly villainous]], but he agrees with the Doom Slayer's method of dealing with TheLegionsOfHell, saying he may be right in killing them all.
* WellIntentionedExtremist: Samuel considers mining Hell for its resources a solid solution to a problem that has no other and, indeed, it is shown to be working for at least a century, having prevented an energy crisis that humanity has no answer for. To him, there is no alternative, and thus any sacrifice/risk is worth it to keep humanity's lights on - [[BothSidesHaveAPoint and, indeed, he is presented as having a point]].
-->'''Samuel:''' You think the only way is to kill them all - leave nothing behind - and you may be right. But we ''can't just shut it all down''. Without Argent Energy it will be worse [...] I am not the villain of this story. I do what I do because there is no choice.
* YouHaveOutlivedYourUsefulness: [[spoiler:As soon the Doom Slayer defeats the Spider Mastermind, Samuel takes the Crucible and sends the Doom Slayer [[SequelHook 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.
** However [[spoiler:Peters isn't so lucky.]]
[[/folder]]

[[folder:Olivia Pierce]]
!!!'''Voiced by:''' Abby Craden

[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/olivia_pierce.png]]
[[caption-width-right:200:''"You could not have saved them, anyway."'']]

->''"I believe in honesty... especially now, in what will be your final moments in this world. All the rumours... the human sacrifices... the Hell portal... the demons... it's all true. My sisters and brothers, be thankful. You will be the first. You will have a seat alongside them as I will in what will become the new world they create for us. Starting now."''
\\
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 is dulled in any way.
----
* BeCarefulWhatYouWishFor:
** [[spoiler:Turns out, making deals with the literal demons of 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]].
** [[spoiler: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]].
* BigBad: Causes the events of the game. [[spoiler:Becomes the final boss, the Spider Mastermind]].
* {{Cameo}}: A statue of her appears briefly in the Nekravol level of ''Eternal''. Naturally, you have to destroy it for progression.
* {{Cyborg}}: Her scoliosis required her to turn to a cybernetic exoskeleton to maintain her ability to walk. One that was grafted into her spine and keeps her in constant pain.
* DealWithTheDevil: Makes an agreement with [[spoiler:Deag Ranak]] to help the Demonic forces invade Mars in exchange for godlike power. [[spoiler:BeCarefulWhatYouWishFor, you might just get it.]]
* {{Determinator}}: [[spoiler: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.]]
* EvilBrit: She speaks with a British accent, and is as evil as they come.
* EvilCripple: 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.
* EvilIsPetty: Honestly, her goodbye note for her followers is pretty much an eloquent version of SoLongSuckers.
* EvilMakesYouUgly: After triggering [[spoiler: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}}: Serves as this continuity's version of Malcolm Betruger from ''VideoGame/{{Doom 3}}'' as another MadScientist who helps the demons access our dimension in return for the promise of untold power.
* FateWorseThanDeath: Her deal with Hell for godhood would have been this; trapped in a giant demonic monster, powerless to control it, forced to watch as it ravaged Earth and humanity.
** In ''Eternal'' we come across a statue of Olivia within the depths of Nekravol. [[AndIMustScream It's crying.]]
* GamerChick: Implied; she has the second-highest score on the UAC leaderboards for Demon Destruction.
* GenreBlind: Exceptionally so, to think that her DealWithTheDevil would benefit her in any way in the long run.
* GodhoodSeeker: 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.
* HellSeeker: Her whole motivation is to open a portal into Hell.
* HoistByTheirOwnPetard: She gets a few of these.
** [[spoiler:She's RewardedAsATraitorDeserves for her DealWithTheDevil, stripping her of any humanity she might have had left]].
** [[spoiler:The Glory Kill that finishes her off involves shoving the BFG into her mouth, resulting in having her brains blown out by a weapon she helped create]].
* ItsAllAboutMe: Her final message in the Codex to her subordinates is that they [[spoiler:are all going to die solely for the benefit of her, and that they should be glad for it.]]
* IWasQuiteTheLooker: You can find a picture of her in her younger years in the Advanced Research Center, and, my ''God'', she looks significantly healthier and more attractive than the current haggish witch she is now.
* KarmicDeath: After selling humanity out in the name of personal power from her demonic overlords, [[spoiler:she’s betrayed by them and twisted into the Spider Mastermind, before finally becoming the last victim of the Doom Slayer’s vengeful rampage.]]
* KickTheDog:
** 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 [[spoiler:''his'' people back on Argent D'Nur]] is up to interpretation, but what she says is horrible either way.
** And, of course, there's her [[SoLongSuckers goodbye]] [[YouHaveOutlivedYourUsefulness message]] to her followers.
* {{Leitmotif}}: [[https://www.youtube.com/watch?v=hFrzOMinwKU "Authorization: Olivia Pierce"]], which is a remix of [[https://www.youtube.com/watch?v=FMex4f8cwEY "Suspense"]].
* MeaningfulAppearance: [[spoiler:Her becoming the Spider Mastermind is very poetic - she made a DealWithTheDevil for power and godhood and betrayed her own people just for that. But she didn't really consider how demons, in general, see humanity ([[TheDreaded save for the Slayer himself]]) as mere ''insects''. Instead of the healthy, all-powerful goddess like she hoped she would be, she became a highly intelligent albeit grotesque, demonic beast whose appearance echoes that of a spider, referring to her sins, and being left by the demons she sided with to be put down like a rabid animal]].
** Even before being turned into the Spider Mastermind, her physical body is visibly deteriorating from TheCorruption. Pictures and video recordings of her from around the time that she first made her DealWithTheDevil show that she originally looked fairly normal for a human woman of her age. By the time the Doom Slayer encounters her in person just before she willingly jumps through the Hell portal, her appearance is already beginning to show signs of TheCorruption taking its toll on her physical body. By the time the Doom Slayer catches up to her again right before she is forcibly transformed into the Spider Mastermind, her body has withered away from both TheCorruption and prolonged exposure to Hell itself to the point where she is little more than a literal walking corpse with barely enough strength left to walk and talk under her own power.
* MorallyAmbiguousDoctorate: 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.
* NotSoWellIntentionedExtremist: 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 [[TheCorruption 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, [[KickTheDog 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]].
* OhCrap:
** 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''.
** [[spoiler: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.]]
* PathOfInspiration: She's turned the UAC from an energy company into a Hellish cult with lies and promises of rewards.
* RewardedAsATraitorDeserves: She defects from the UAC to the TheLegionsOfHell, either having been drawn in by their promises of power or the thought that they could help humanity’s evolution only to suffer SanitySlippage from TheCorruption, and in the end, [[spoiler:they rewarded her by transforming her into a [[SpiderTank mechanical]], [[{{Cephalothorax}} big-brained]] monstrosity and leaving her to die after she fails to kill the Doom Slayer]].
-->'''Dr. Olivia Pierce:''' [[spoiler:They promised me... ''so much''...]]
* SmugSnake: Although she managed to unleash the demons upon the UAC station, it’s 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 Slayer’s sarcophagus as a countermeasure should she go through with it. She also sincerely thought that her demonic benefactors wouldn’t double-cross her the first chance they got. [[spoiler:But by the end of the game, you’ll find out for yourself how ''that'' goes.]]
* TheSociopath: While it’s unclear whether she was this from the beginning, or due to the [[TheCorruption after-effects]] from her DealWithTheDevil, 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 mankind’s evolution and [[YouHaveOutlivedYourUsefulness ultimately leaves them to perish after their usefulness is used up]] while [[KickTheDog leaving behind a note sadistically informing them of their impending fate]] ForTheEvulz.
* StraightEdgeEvil: Would rather live in pain than risk medication that would slow her mind.
* UngratefulBitch: 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.
* UnwittingPawn: To Hell itself, given the horrible things she caused in hopes that it would reward her and only her. [[spoiler:[[RewardedAsATraitorDeserves That didn't work out too well]].]] Codex entries in ''Eternal'' go an extra mile to imply that the entirety of Olivia's actions were remotely stirred by the Hell Priests in their own preparations for the invasion of Earth.
* VocalEvolution: As TheCorruption is causing not only [[SanitySlippage her mental stability]], but also her physical well-being to gradually worsen over time, it's reflected by her voice becoming increasingly weaker and frailer.
[[/folder]]

[[folder:VEGA]]
!!!'''Voiced by:''' Kevin Schon
[[quoteright:211:https://static.tvtropes.org/pmwiki/pub/images/vega_symbol.png]]

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.
----
* AmbiguousSituation: In ''Eternal'', [[spoiler:VEGA is left behind on the dying world of Urdak, seemingly being fried or perhaps reset in the process with neither Samuel nor the Slayer raising a note about it.]]
* AmnesiacGod: [[spoiler:One line in the mission "Urdak" in ''Eternal'' gives the option that it is ''not'' a man-made artificial intelligence, but whatever "the Father" is that made the Maykr, brought to Earth by Samur Maykr. However, when it asks Hayden, he characteristically ignores its words.]]
-->'''VEGA:''' I can see now... [[spoiler:[[WhamLine Am I... the Father, Dr. Hayden?]]]]
* ArtificialIntelligence: VEGA is the MasterComputer that runs the Mars facility. In-universe, it was put to the [[https://en.wikipedia.org/wiki/Turing_test 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.
* BenevolentAI: Not only does VEGA - a sentient AI fuelled 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 [[spoiler:walking you through ''killing him''. In ''Eternal'', VEGA becomes the Doom Slayer's MissionControl, helping him to keep the Fortress of Doom running, providing intel, and teleporting the Doom Slayer to the places he needs to be.]]
* BigBrotherIsWatching: Supposedly, VEGA monitors ''everything'' going on at the UAC, barring some top-level research.
* DeusEstMachina: Given the last comments from him before he begins aligning the portal rings, it is very likely that VEGA is no mere AI - it's [[spoiler:''The Father'' of Maykr belief, the one responsible for their creation]]. How it came to be VEGA is something that Samuel Hayden is probably the only one who knows about.. and he isn't telling.
* DoAndroidsDream: Right before [[spoiler:VEGA is about to overheat, just as the Doom Slayer makes a backup,]] VEGA tells Samuel Hayden that he has "many regrets". This is the first and only time he shows anything resembling a train of personal thought.
* {{Foreshadowing}}: ''DOOM (2016)'' notes that "it is rumoured that VEGA's core is powered by a piece of arcane technology found near the Argent Fracture." Come ''Eternal'' [[spoiler:it's revealed he is in fact the lost [[DeusEstMachina A.I. god]] of the Maykrs.]]
* HeroicSacrifice:
** [[spoiler:Allows the Doom Slayer to destroy him]] in order to open a portal to The Well so that he can shut it down.
** In ''Eternal'', [[spoiler:he does it again, this time seemingly for good as he is required to create an exit portal from Urdak back to Earth once the Slayer's rampage there is complete, and he is now in control of the entire Maykr realm.]]
* ICannotSelfTerminate: Which makes sense -- VEGA is just an AI with no limbs or otherwise physical means of [[spoiler:destroying his own neural processors, or blowing up his cooling tanks.]] Even so, he dutifully directs the Doom Slayer to do these things fully aware that these actions would destroy him.
* IRegretNothing: Subverted. Right before VEGA [[spoiler:completely melts down, he says "I have many regrets",]] presumably for playing a part in the UAC's monstrous activities.
* NotQuiteDead: The Doom Slayer makes a backup of him before [[spoiler:going through with destroying him.]]
* TheSmartGuy: VEGA comes up with all the ways you can improve your suit and weapons.
* MysteriousPast: In ''2016'', VEGA is an artificial intelligence that was supposedly created by the UAC, but the exact details were unspecified. It's notable given VEGA is Samuel's equivalent of a personal right-hand man. In ''Eternal'', [[spoiler:when he's plugged into the mainframe of Urdak, the Maykr homeworld, he asks if he's "The Father", referring to the seeming god that the Maykrs had followed before its mysterious disappearance. The game never answers if this is simply the effects of the interfacing, or VEGA was formerly the Father as an AI system swiped by Samur the Seraphim.]]
* TokenGoodTeammate: To the UAC. Samuel Hayden is a WellIntentionedExtremist who was willing to sacrifice everything (including his own employees) for "the betterment of mankind", and Olivia Pierce turned out to be a NotSoWellIntentionedExtremist whose sole drive was to obtain godlike power. VEGA, on the other hand, is thoroughly polite and patient with [[TheBerserker the Doom Slayer]] and [[spoiler:performs a HeroicSacrifice to stop Olivia (albeit [[ICannotSelfTerminate with the Doom Marine's help]]).]]
* WhamLine: In ''Eternal'', potentially throwing its entire purpose in the plot on its head.
-->'''VEGA:''' [[spoiler:[[AmnesiacGod Am I... the Father]], Dr. Hayden?]]
[[/folder]]

[[folder:Abraham Peters]]
The protagonist of ''Doom VFR''. A scientist for the UAC who had been protected from the initial wave of demonic energy that Olivia unleashed, only to be torn apart by a Pinky after stepping off an elevator. However, a top-secret UAC protocol caused his consciousness to be digitized, allowing him to download himself into a combat-ready chassis and get to work containing the demonic presence.
----
* BrainUploading: The first man since Samuel Hayden to undergo the process.
* BulletTime: Can alter his perception and reactions to slow down time around him.
* CameBackStrong: Doesn't get much stronger than going from a throwaway corpse set-piece to pulling off feats of demon-slaying almost on par with the ''Slayer''.
* DualWielding: Can utilize a full arsenal in his right hand, and a grenade launcher in the left.
* EarlyBirdCameo: Peters actually appeared in ''Doom (2016)'' ahead of ''VFR'', as the upper half of a corpse that the Slayer had to pick up to access the BFG.
* HeroicMime: Averted; Dr. Peters muses to himself on a semi-consistent basis about what he has to do next.
* UnskilledButStrong: While he's a mere scientist with at most a few minutes of virtual training to acclimate himself to his new body, that body is of a combat cyborg and contains a plethora of features to augment his more strategically-inclined mindset.
* OneManArmy: Though he doesn't take on odds quite as heavy as the Doom Slayer, he proves his mettle by fighting through the forces of Hell on his own terms, eventually taking on a long-thought-lost prototype of the Cyberdemon to acquire its Argent Accumulator.
* ShaggyDogStory: [[spoiler:Just after closing the portal as he had intended, Samuel Hayden overrides his access to the combat body and ''deletes his consciousness'' for "causing problems".]]
* TeleFrag: His substitution for Glory Kills; once an enemy is staggered, he can lock onto their position and teleport into them to instantly gib them.
* TeleportSpam: Capable of this due to a special feature of his combat body.
[[/folder]]

[[folder:UAC Spokeswoman]]
A holographic woman who actively supports the demonic invasion of Earth, spewing Pro-Hell propaganda and encouraging mankind to roll over and die for their new masters.
----
* AmbiguouslyHuman: It's unclear if she's supposed to be some kind of AI or a human cultist who made some pre-recorded lines for general broadcast. Considering the unholy tide of supernatural phenomena ravaging the Earth by this point, she may even be HauntedTechnology.
* BadIsGoodAndGoodIsBad: "Remember, no one is born a sinner. You have to work to achieve success."
* DissonantSerenity: Is relentlessly cheerful when describing the horrifying "benefits" the demons offer to mankind. Even when she openly taunts people for putting their faith in the Doom Slayer, she sounds more teasing than overly snide.
* FauxAffablyEvil: Is cheery, polite and snarky, as she calls for humanity to die screaming at the hands of Hell itself, sometimes while gloating about how no one is coming to save them. It's far more clear in ''Eternal'', when there is no reason to even pretend that the UAC have anything in mind but selling Earth to the demons, and gets more and more evident over the course of that game.
* PoliticalCorrectnessGoneMad: She says it's rude to call TheLegionsOfHell "demons" and that you should call them "mortally challenged." Indeed, even the unambiguously Anti-Demon ARC News agency defaults to this term (at least until the end of the game).
* RightForTheWrongReasons: As part of her 'Demons are our friends' shtick, she spouts several lines about how people should accept the demons because they are NotSoDifferent from humans. It comes off as PoliticalCorrectnessGoneMad, but [[spoiler: given how demons are humans tortured past the DespairEventHorizon, she is [[DemonOfHumanOrigin technically correct]]]].
--> '''Spokeswoman:''' "There is no 'they', for 'they' are 'us', and 'we' are 'they'."
--> '''Spokeswoman:''' "Evolution is our destination, when they arrive, we arrive".
* TheQuisling: She's not shy about playing favourites for the demons.
* {{Understatement}}: When the Doom Slayer arrives on Earth to destroy the Super Gore Nest, she remarks to potential passers-by that "you might notice a slight change in the environment." You're immediately treated to a ruined city filled with lava, giant tentacles, and MeatMoss.
* VillainousBreakdown: Finally snaps when the Doom Slayer is closing in on the Icon Of Sin, screaming out of desperation and frustration at the demons present to kill him.
* WhatHappenedToTheMouse: She's never heard from again after her last VillainousBreakdown, barring canned dialogue.
[[/folder]]

!Argent D'Nur
An alien realm populated by HumanAliens with access to a powerful and abundant energy source, who have ties to the Slayer's past. They were invaded by Hell and taken over, shortly after a civil war and an unexpected betrayal.
[[folder:Valen the Betrayer]]
!!!'''Voiced by:''' Kyle Chapple
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/betrayer.png]]
[[caption-width-right:350:''"It is your people's time now to give penance... just as it was mine."'']]
->''"Saving your people will not bring you peace. Only make the burden you carry worse."''\\\

A disgraced Night Sentinel that facilitated Hell's conquest of Argent D'Nur in return for the resurrection of his deceased son. [[DealWithTheDevil In their own twisted way of fulfilling their end of the bargain]], the demons brought back the Betrayer's son as the Icon of Sin, leading the Betrayer to exile himself within Hell as atonement.
----
* TheAtoner: Has voluntarily exiled himself in Hell as atonement for his betrayal.
* BreakTheBadass: Betraying his entire people to gain his son back, only for that to [[CameBackWrong go horribly awry]], has done a number on the man. Even now, he'd rather stay exiled and just let the Maykrs and Hell consume Earth rather than step up to the plate alongside the Slayer.
* ChekhovsGun: Gives it to you, in the form of a handheld device he tosses at you before you leave with what you came for. He hints that you will need it to grant [[CameBackWrong his son]]'s heart peace at last... [[spoiler:it turns out to be literal, as the heart means his ''actual'' heart, and the device is a ritual switchblade-esque knife; plunging it into the Icon's heart is vital to finally derail the Khan's ritual]].
* DealWithTheDevil: Sneaks a Hell Priest into the inner sanctums of Argent D'Nur, leading to the world's final downfall, in return for having his son who had fallen during the war with Hell resurrected. The demons bring back the boy as a massive demon instead, as "the wages of treachery are suffering".
* DropTheHammer: An argent energy warhammer can be seen resting against his seat when the Slayer visits his hideout.
* TheEngineer: Overlapping with CrazyPrepared, his hideout is littered with several pieces of military technology, including motion sensor energy turrets and a HumongousMecha stationed in the back. He also has a large spherical battery meant for the Slayer's locator device, as well as a unique device which turns out to be [[spoiler:a ritual knife used to free the Icon of Sin from the Khan Maykr's control]]. Needless to say, the man appears to know his way around machinery.
* ExactWords: The Betrayer wanted his son revived. Unfortunately, he didn't specify as ''what''.
* TheGhost: He's mentioned in the Slayer's Testament ApocalypticLog in ''DOOM'', but never seen. You only get to meet him properly in ''DOOM Eternal''.
* {{Leitmotif}}: The music that plays during his scene is a solemn cover of the intro to "The End of DOOM", the ending theme for all the episodes of the first ''Doom''.
* MythologyGag: His son was reincarnated as "the Icon of Sin", the FinalBoss of ''Doom II: Hell on Earth''.
* OldSoldier: Has the appearance of a grizzled man in his late fifties, with white hair and a slight droop. He's still quite buff for his age, however. Doubly so when you remember he's not fifty-something, but several millennia-old as he's been in Hell since before the Slayer's entombment.
* OnlyKnownByTheirNickname: He is given no name in ''DOOM'', only being referred to as "The Betrayer". Similarly, the subtitles when you meet with him in ''Eternal'' only call him "Betrayer" as well. [[spoiler:The codex reveals his name to be Valen.]]
* RewardedAsATraitorDeserves: He betrayed Argent D'Nur in exchange for his son who fell in battle being revived. The demons kept their bargain by reviving the boy as [[CameBackWrong a demon]] because "the wages of treachery are suffering".
* ShellShockedVeteran: Has shades of this when the Slayer visits him, appearing tired and battle-worn compared to the much younger-looking Doomguy. Given what he's been through, it's understandable.
* TreacheryIsASpecialKindOfEvil: [[AlwaysChaoticEvil The demons may be evil]], but their writings indicate a loathing of traitors like him, referring to him as "wretched".
[[/folder]]

[[folder:The Night Sentinels]]
[[quoteright:307:https://static.tvtropes.org/pmwiki/pub/images/night_sentinels.jpg]]

The Night Sentinels were an order of knights that, together with the Doom Slayer, stood against the armies of Hell in the alien realm of Argent D'nur long ago.
----
* AdvancedAncientHumans: [[spoiler:Despite initially being set up as aliens, lore found in the Cultist Base ''heavily'' implies that, in ''Doom'''s setting, humans on Earth descended from an ancient colony of Argenta's, located in the arctic.]] This also explains why [[spoiler:their culture is so close to that of the ancient North Germanic peoples, particularly the Norse.]]
* AsskickingEqualsAuthority: They were big on this; the most capable warrior in their ranks was naturally seen as the fittest to lead. [[spoiler:This naturally means that Doomguy became their king by default until he kills Deag Grav.]]
* BadassArmy: An entire order of demon-slaying knights who fought back Hell itself before being betrayed from the inside. [[spoiler: This was the ONLY reason they fell; if not for the treachery, they would have won, making them probably the only army in the franchise to successfully resist the invasion, albeit with help from the Slayer.]]
* BlueAndOrangeMorality: [[BloodKnight a lot of their culture is centred around battles for better or worse]]. Their culture worships strength and bravery, to the point where AsskickingEqualsAuthority and vice versa, MightMakesRight, and their way to deal with prisoners and criminals is to have them fight in a public arena, possibly to the death. And apparently being a stranger counts as a crime. That is even before the corruption set in. Those who survive get to be conscripted into their military to serve under the Maykrs, who don't have the best track record of being morally upright.
* ChurchMilitant: They definitely look the part, resembling an order of knights with their armours and being in service of supposedly celestial power.
* DoomedHometown: Their world was destroyed and absorbed into Hell long before the events of the games.
* FallenHero: A heroic faction of demon-hunting warriors that fought alongside the Slayer in early times; they spread to many planets, and built a prosperous interstellar civilization. [[spoiler:Ultimately, they were fractured by a schism over whether to overthrow the Khan Maykr or stay loyal to her, even after the [[HumanResources true nature of Argent Energy was revealed.]] The rebels, led by the Slayer, would have won if not for the Betrayer; by ''Eternal'', the ones that remain are fully in cohorts with the Khan Maykr and Hell Priests who orchestrated their downfall and dependence on them, becoming little more than servants of their will.]]
* FeudalFuture: They were an order of holy knights despite the fact they lived on a futuristic alien world that had PoweredArmor and weapons like {{Laser Blade}}s. They were also spacefaring and colonized many worlds.
* HonorBeforeReason: Their culture and code of honour logically led to this. [[spoiler:It ultimately led to their downfall; even the realizations that Argent Energy was made from their fallen brothers and sisters, and that they were being manipulated and betrayed at the highest levels, were not enough to convince all of them to turn against the Khan Maykr.]]
* HumanAliens: They hail from the alien world of Argent D'Nur, and yet look indistinguishable from humans both in and out of armour. [[spoiler:Lore found in the Cultist Base level implies that this is because the humans of Earth are descendants of an ancient colony of Argenta, which would effectively ''invert'' this trope.]]
* LastStand: [[spoiler:The ones who remained loyal to Argent D'Nur instead of the Maykrs pulled off one of epic proportions after being betrayed and left to die.]]
* MyMasterRightOrWrong: Even after the Maykr's treachery was exposed, a large portion of the Sentinels remained loyal to them. On the flip side of the coin, they still acknowledge the Slayer's sovereignty when he shows up at Sentinel Prime, [[spoiler:though not for long]].
* OurGhostsAreDifferent: A number of them still haunt various realms, including the depths of Hell, and point the way for their ally, the Doom Slayer, when he meets them. In ''Eternal'', the Slayer can find hidden spirits of fallen Sentinels who each hold a Praetor Suit Token for him to take.
* PoweredArmor: Their armour, which is usable in ''2016'''s multiplayer, is equipped with a variety of thrusters, sensors, lights, and other hi-tech features. One of them is seen using a wrist-mounted radio in ''Eternal.''
* ProudWarriorRaceGuy: In general, their culture was strongly reminiscent of the Norse, with a high emphasis placed on honour, combat prowess, and AsskickingEqualsAuthority. They had a WarriorHeaven, and even the lowest members of their society were able to rise to greatness through sheer guts and combat prowess.
* TheRemnant: They were believed to be extinct in ''2016'', but some Night Sentinels survived, and are in the employ/service of the Khan Maykr. [[spoiler:They are implied to be the few survivors of the loyalists from the Argenta Civil War.]]
* TrueCompanions: Those of them who [[spoiler: remained loyal to Argent D'Nur became this to the Doomguy. The final entry of their history codex is full of SoProudOfYou and TakeUpMySword towards him, and their deaths at the hands of the demons launched him into his second and ongoing UnstoppableRage.]]
* WholeCostumeReference: Their templar armour is based on actual 15th Century gothic plate armour used by the real-world UsefulNotes/HolyRomanEmpire.
[[/folder]]

[[folder:King Ormero]]

The first king of Sentinel Prime.
----
* TheGhost: As a figure from the distant past, he is only mentioned in ''DOOM Eternal''[='s=] codex.
* MythologyGag: Rearrange his name and it becomes "Romero", a reference to Creator/JohnRomero, co-founder of Creator/IDSoftware and co-creator of the ''Franchise/{{Doom}}'' franchise.
[[/folder]]

[[folder:King Novik]]
!!!'''Voiced by:''' Piotr Michael

[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/novik.png]]
[[caption-width-right:350:''"It is written, it is their time to give penance..."'']]

->''"Against all the evil that Hell can conjure, all the wickedness that mankind can produce, we will send unto them... only you. Rip and tear, until it is done."''
\\
The ruler of Sentinel Prime and the leader of the Sentinels, as well the last King of Argent D'Nur, before it was consumed by Hell.
----
* AnimalMotif: [[NobleWolf Wolves]], as shown by his kingdom decorations and the spectral wolves that roam Sentinal Prime.
* AsskickingEqualsAuthority: Implied; due to Sentinel law, only the mightiest warrior can rule Sentinel Prime, thus Novik is suggested to be incredibly powerful. Even the Doom Slayer kneels to Novik when the former is chastised for taking the Celestial Locator in order to find and kill the Hell Priests.
* BadassBoast: While he may chastise the Doom Slayer for going against the current order by going after the Hell Priests, all of whom are still considered Sentinels because of their bloodline, he holds a high opinion of him as evident by his words at the beginning of ''Eternal.''
-->'''Novik:''' Against all the evil that Hell can conjure, all the wickedness that mankind can produce, we will send unto them... [[OneManArmy only you.]] Rip and tear, until it is done.
* ComicBookFantasyCasting: His face is modelled after the late [[Music/{{Motorhead}} Lemmy Kilmister]], even sharing the same distinct boils on their face.
* HonorBeforeReason: He is fully aware of the current state of things, but he chastises the Doom Slayer for going after the Hell Priests since, while they are demons, they still bear Sentinel blood.
* ReasonableAuthorityFigure: In the end, [[spoiler:he fully endorses the Doom Slayer's campaign against Hell despite his reservations in opposing the Khan Maykr as not only does he allow the Slayer to leave anyway without much a suggestion against this path, but after it's all said in done and he BookEnds the game, he commends the Slayer's power and will and how it will forever protect humanity.]]
[[/folder]]

This page contains tropes for the unique characters and boss-monsters in ''VideoGame/Doom2016'' and ''VideoGame/DoomEternal''. For tropes relating to the characters of the classic games, click [[Characters/{{Doom}} here]]; for those found in ''VideoGame/Doom3'', click [[Characters/Doom3 here]].

[[/folder]]

!Demons
The native inhabitants of Hell, demons are AlwaysChaoticEvil beings that thrive on nothing but rage, hatred, pain and suffering, and perpetually seek out other worlds and dimensions for conquest and slaughter. They are the central antagonistic force of the series.
[[folder: General Tropes]]
* AlwaysChaoticEvil: We've yet to see a single demon that can't be summed up as "wants to murder everything that isn't from Hell". Oftentimes, [[EnemyCivilWar they don't even make that distinction]].
* TheBerserker: They all are described as being the incarnation of rage and brutality itself.
* EnemyCivilWar: Codex entries refer to a few that happened during their first age, for example, the Hell Knights were serving an entity known as the Great Serpent until its defeat and they became gladiators. Even in-game they fight each other when there is nothing else to do.
* EvilIsVisceral: Their Hell is a cross between FireAndBrimstoneHell and full-on Creator/HieronymusBosch BloodyBowelsOfHell. Most of their environments and structures are made from entrails and corpses, and some demons are even crudely grafted with cybernetics, interwoven with their guts.
* MadeOfIron: Many of the larger or higher-level demons can easily shrug off explosives/energy blasts and will keep on fighting, even if they are reduced to a skeleton.
* TheSoulless: Some demons are soulless, some aren't. [[spoiler: The ones that are, are so because their soul was extracted and turned into Argent Energy]].
* ZergRush: While Hell's ruling class (such as the Hell Priests and the Nameless One) employ deceit and manipulation to subvert the defences of realms and worlds marked for conquest, most of the actual battle tactics used by Hell's armies basically boil down to "overwhelming the enemy with hundreds of thousands of bloodthirsty monsters".
[[/folder]]

!!Introduced in ''Doom (2016)''
[[folder:The Possessed/Zombie]]
!!!The Possessed/Zombie
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/img_0165.PNG]]

A reinterpretation of the Zombie enemy from ''VideoGame/Doom3''.\\\
In ''VideoGame/Doom2016'', the Possessed are former staff members of the UAC, resurrected when Olivia Pierce unleashed an Argent Wave from the Lazarus Labs to kickstart Hell's invasion of Mars. These come in several varieties: Workers and Scientists are undead cannon fodder with little health and a claw swipe as their only means of attack, while Engineers are walking bombs with explosive canisters dislodged within them. There's also the Unwilling, which are ancient, alien zombies who have been transformed over centuries in Hell into lesser demons.\\\
In ''VideoGame/DoomEternal'', not only has much of Earth's population been converted into mindless zombie slaves, but UAC cultists have upgraded many of them into "Mecha Zombies" outfitted with cybernetics in order to increase their combat effectiveness.
----
* ActionBomb: Possessed Engineers have a propane tank lodged in their torso, which they'll detonate if you get too close to them.
* AdaptationalWimp: Completely harmless compared to the relatively present threat they presented during the early missions of ''Doom 3''.
* AllThereInTheManual: The fact that the Possessed were deliberately created by the [=UAC=] before the demonic invasion is covered in "The [=UAC=] Handbook", a small flavour-text manual that comes bundled with the physical copies of the game.
* ArmCannon: The Mecha Zombies have their right arm replaced with a plasma cannon that also doubles as a flamethrower.
* BodyHorror:
** In ''2016'', the Argent Energy that brought them back ''really'' did a number on them; their skin is overgrown and seems to consume anything in contact with it, which leads to them getting things like bits of clothing and explosive cylinders absorbed into their body. Additionally, 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''.
** The Zombies of ''Eternal'' don't look quite as disgustingly inhuman, with two exceptions; the Cueball, which is even more grotesque than its Engineer predecessor, and the Mecha Zombie, which has various cybernetic bits poking out all over its body, as well as what look to be exposed intestines.
* CameBackWrong: Long story short: Good news, Argent Energy allows you to come back from the dead. Bad news, [[HumanoidAbomination you are now the furthest thing from human]] [[BodyHorror that you can possibly be]].
* {{Cyclops}}: Possessed Scientists in ''2016'' only have a single large eye-like cavity on their head.
* FullFrontalAssault: The zombified civilians in ''Eternal'' and the Unwilling both appear to be totally naked, bar some tattered rags that already kind of match their skintone.
* TheGoomba: The basic Possessed/Zombie variants are the weakest enemies by a decent margin, being slow, fairly stupid, fragile, and none too damaging.
* HelpfulMook: Downplayed. ''Eternal''[='s=] version of the Engineer, the Cueball, will literally just stand around harmlessly until you shoot/punch it, whereupon it will fly in a straight line and explode against whatever wall or enemy is unfortunate enough to be in its way. This will instantly gib anything short of a Cyber Mancubus, and heavily injure whatever survives. However, it is still not your friend; it can gib the Slayer just as readily as it can nearby enemies.
* HumanoidAbomination: Former human beings that were exposed to demonic energy, transforming them into deformed feral monstrosities, with the Unwilling and ''2016''[='s=] Possessed Scientists, in particular, appearing barely human.
* HumanSacrifice: Supposedly, UAC staff members volunteered to become Possessed for experimentation purposes (willingly or otherwise), but still.
* ManBitesMan: If a Possessed Scientist or an Unwilling kills the Doom Slayer in ''2016'', you get a scene of them ''ripping out his throat with their teeth''.
* OurZombiesAreDifferent: The Possessed in ''2016'' are former UAC staff that were killed and then resurrected by Argent Energy as a result of the Lazarus Wave, while the Unwilling are the partially demonic remnants of cultures defeated and assimilated by Hell over eons. The Zombies are ''Eternal'' are stated to be those who have been "corrupted and deceived" by Hell's power to become "mindless, grotesque contortions of their former selves".
* PinataEnemy: ''Eternal''[='s=] codex entry for Zombies straight up encourages you to farm them for resources. This is also true for ''2016'', where you seem to encounter gangs of unprotected Possessed fairly often, allowing you to stagger them each with a single melee strike and effortlessly Glory Kill them for easy health.
* ProgressivelyPrettier: A mild example; the zombies in ''Eternal'' look more akin to classic zombies than the deformed masses of flesh they were in ''2016''.
* SuicideAttack: The Engineer variant in ''2016'' comes with a welding tank fused into its flesh. It is capable of charging at the player and detonating when it gets close.
* TookALevelInBadass: Mecha Zombies can take more damage than Possessed Soldiers and has an arm cannon that doubles as both a plasma blaster for ranged attacks and a flamethrower for close-range attacks. Their walking speed is still pretty slow, however.
* UndeadBarefooter: All Possessed variants except the Engineer/Cueball are barefooted.
* UndergroundMonkey: Even the most basic Possessed/Zombie comes in a number of varieties, ranging from former UAC scientists and workers to unfortunate citizens of Earth, to even ancient undead (referred to as "the Unwilling" in ''2016'') who are the remnants of alien civilizations conquered and absorbed by TheLegionsOfHell.
* UnfriendlyFire: It's surprisingly easy to get Possessed in ''2016'' to damage their own forces, as they have considerable reach with their flailing claw strikes, which in cramped confines often results in one Possessed hitting a bunch of its buddies instead of you, usually staggering them for you to follow up with some quick Glory Kills.
* WolverineClaws: Mecha Zombies have had the fingers on their left hand replaced with large metal claws.
* ZombieGait: All Possessed and Zombie variants will shamble slowly at you.
[[/folder]]

[[folder:Possessed Soldier]]
!!!Possessed Soldier
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/codex_hellified_soldierbimage.png]]

The zombified remnants of human soldiers, these grunts retain most of their combat prowess and intelligence compared to other zombies, and wield either a plasma rifle or a shield-and-shotgun combo. They are the modern counterparts to the Zombiemen and [[VideoGame/Doom3 Z-Sec]] enemies of old.
----
* AchillesHeel: Possessed Security (aka Shield Soldiers in ''Eternal'') can effortlessly tank bullets and shotgun shells with their shield. However, the ''2016'' Plasma Rifle's Stun Blast mod will disable their shield in a single shot and leave them a sitting duck for several precious seconds. This is taken even further in ''Eternal'', where even just normal Plasma Rifle bolts will quickly overcharge their shield and cause it to explode violently in a wide radius.
* ArmCannon: Their gun is directly merged into their right arm.
* BaldOfEvil: Shield Soldiers in ''Eternal'' have completely shaved heads.
* BodyHorror: In ''2016'', their armour and guns look to have been ''fused'' into their flesh.
* ChargedAttack: Regular Soldiers can charge up their plasma rifle to fire a slow-moving shot that explodes after travelling a short distance.
* CompositeCharacter: The revamped Shield Soldier in ''Eternal'' is what you'd get by throwing the Possessed Security from ''DOOM (2016)'' and the classic Shotgun Sergeant into a blender.
* JumpJetPack: In ''Eternal'', they get jetpacks that allow them to make huge leaps.
* HoistByHisOwnPetard: Come ''Eternal'', the Doom Slayer can turn the Shield Soldier's own protection against him by overloading it with a stream of plasma shots, which blows him up for an instant kill, [[SplashDamage as well as taking out any weak demon he might be huddling up with]].
* ItCanThink: As stated in ''2016''[='s=] codex, Possessed formed from individuals with military training or exceptional physical prowess are fully cognizant and calculating, allowing them to use tactics as well as any living soldier. The [[AllThereInTheManual UAC Handbook]] outright brags about their ability to think fast on their feet, and how they overall move, act and think much more human-like than the basic Possessed. One of the credit scenes is a good example, showing a Possessed Soldier vaulting a rail as two Possessed Scientists mindlessly shamble around in the background. In fact, Possessed Soldiers occasionally say something in a deep, distorted voice that is clearly not just roaring and growling, and some of their voice lines seem to actually be barely-legible English, indicating that they may indeed be sentient.
* ShieldBearingMook: Possessed Security/Shield Soldiers are a variant who carry a HardLight tower shield that [[LuckilyMyShieldWillProtectMe protects their front]] and is capable of [[AttackReflector reflecting ballistic slugs and bullets]] right back at the player. The shield can be damaged through sustained fire (indicated by its colour changing from blue to teal to red), but all it takes to return it to full strength is a one-second move on the wielder's part, which means you're all but forced to outmanoeuvre them if you can't bring explosive or plasma ordnance to bear against them.
* ShotgunsAreJustBetter: The Possessed Security/Shield Soldiers wield shotguns and are among the few enemies with a {{hitscan}} attack, making them surprisingly dangerous, especially combined with their bullet-repelling shield. However, [[ShortRangeShotgun their weapon has ridiculously short range]] beyond which it doesn't deal any damage whatsoever, so keeping your distance makes them largely harmless outside of melee range.
* SuperSoldier: The UAC on Mars experimented thoroughly with the undead created from humans slain by Lazarus Wave radiation, hoping to find scientific/military applications. The discovery that certain individuals retained cognizance depending on their background is what directly led to the [[EliteMooks Revenant]] [[BodyHorror project]].
* TookALevelInBadass: Soldiers in modern ''Doom'' are much nastier than their Zombiemen, Shotgun Guy, and Z-Sec 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. They even get jetpacks in ''Eternal''.
* TruerToTheText: The ones in ''Eternal'' have been redesigned to more closely resemble their classic counterparts; most noticeably, the regular Soldiers now have green hair like the original games' Zombieman sprite. Additionally, the redesigned Shield Soldiers seem to take major cues from the Shotgunners of old.
* UnfriendlyFire: Plasma bolts fired by the Soldiers continue on their trajectory until they hit something regardless of affiliation, and their ChargedAttack has a considerable radius around the detonation point; in ''2016'', this means that they often hurt other demons instead of you.
[[/folder]]

[[folder:Hell Razer]]
!!!Hell Razer
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/hell_razor.png]]

A humanoid creature making its first - and currently only - appearance in ''2016'', geared with an arm-like protrusion that can charge up and emanate a beam of unrefined Argent energy.
----
* ArmCannon: Their right arm is replaced by a large protrusion that functions as a laser cannon.
* {{Expy}}: The Hell Razer is most definitely a stand-in for the classic Chaingun Bob and Chaingun Commando from ''Doom 3'', only the chaingun is replaced with an integrated laser gun.
* EyelessFace: They don't seem to have eyes, a particularly interesting trait for what is basically a demonic sniper.
* FrickinLaserBeam: 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.
* LongRangeFighter: While they can swing their arm as a melee attack, they usually prefer staying at a far distance from you.
* PaletteSwap: 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 [[DivergentCharacterEvolution in early versions of the game]].
* PowerGlow: Their body emits red lights of unrefined Argent energy.
* PuppeteerParasite: [[AllThereInTheManual 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 [[BodyHorror mutates its arm]] into an organic cannon.
* ThroatLight: Their throat also emits a glowing red light.
[[/folder]]

[[folder:Imp]]
!!!Imp
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/img_0154.PNG]]

One of the most common demonic enemies you fight, this version of the Imp looks and acts similarly to their older counterparts... if with a few refinements.
----
* ChargedAttack: Can charge up their fireball to deal massive damage.
* DeathFromAbove: They like to cling to walls or ceilings and then pelt you with fireballs.
* {{Fatality}}: If they defeat the Doom Slayer in ''2016'', they knock him to the ground and then scurry over. Before he can recover, they turn him over, disembowel him with their claws, [[AnArmAndALeg rip off his left arm]] and then [[GrievousHarmWithABody brutally smash him in the face with it]].
* {{Fireballs}}: Like in previous games, their primary attack is tossing a fireball.
* TheGoomba: Despite their upgrades, they remain relatively common and easy to take down.
* LudicrousGibs: Imps are one of three specific demon species that you must seek out to master one of your weapons. Twenty direct hits with the Combat Shotgun's GrenadeLauncher mod are required to master this upgrade, so prepare for a lot of bloody Imp parts flying around once you get to work.
* {{Mooks}}: Just like in the original ''Doom'', they are commonly encountered. In fact, they appear in every single level in both games. According to the Imp's Codex entry in ''Eternal'', this is due to the fact that their low level of intelligence and high level of aggression combined with their seemingly limitless numbers makes them perfect expendable cannon fodder for Hell to throw at enemies en masse.
* SpikesOfVillainy: In ''Eternal'', imps sport pronounced spikes of bone on their backs, [[TruerToTheText to more closely resemble their classic designs]].
* TookALevelInBadass: Here, they are considerably more agile and aggressive foes than the classic games. 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 OneHitKill players without armour.
* WallCrawling: They can climb and cling to walls to get a better shot at you.
[[/folder]]

[[folder:Pinky/Spectre]]
!!!Pinky/Spectre
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/img_0157.PNG]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/spectre.png]]

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.
----
* AchillesHeel: They are very fast and incredibly resilient from the front, but they are terrible at cornering and can only swivel slightly to either side while charging. This makes it easy to dodge or jump out of their way and shoot them in their vulnerable backsides.
* AscendedFanon: "Pinky" originated as a FanNickname, as their official name of "Demon" was often [[DepartmentOfRedundancyDepartment confusing]]. In-universe, the term "Pinky" was coined by UAC expedition soldiers, the nickname sticking because researchers couldn't find any direct references to the creatures in demonic texts.
* AttackItsWeakPoint: As tough as they are from the front, their rear end is incredibly squishy.
* BizarreAlienSenses: According to the ''DOOM Eternal'' Collector's Edition Lore Book, they have an uncanny ability to scent the blood of their prey.
* BullfightBoss: Not a boss, but Pinkies are ''extremely'' well-armoured at the front and very prone to charging, meaning that it's generally best to dodge around their attack so you can hit their vulnerable rear.
* CloseRangeCombatant: As they have no ranged attacks, they rely entirely on their melee charge.
* EyeScream: In ''2016'', Glory Killing them from the front will have the Doom Slayer rip off one of their tusks and stab it into their eye.
* HeavilyArmoredMook: The bony armour on their heads allows them to survive even a direct rocket hit.
* FoodChainOfEvil: They are said to serve as beasts of burden, hunting companions, and livestock, with higher demons considering them something of a delicacy.
* MadeOfIron: They're not ''completely'' invulnerable from the front, so you can in fact shoot your way out if one manages to corner you in a narrow passage, but their armoured carapace will still take a ''lot'' of firepower to punch through.
* MultipleChoicePast: In ''2016'', the Spectre's invisibility is said to be the result of the UAC implanting a Cacodemon's optic nerve into a Pinky test subject, allowing it a form of psionic invisibility... [[LamarckWasRight a trait somehow passed on to its offspring when the Spectre escaped back to Hell and reproduced]]. However, ''Eternal'' states that the Spectre was instead created through ancient forbidden sorcery by a group of warlocks attempting to overthrow the Archdemons.
* OutsideTheBoxTactic: In ''Eternal'', a single Blood Punch will kill them even from the front.
* TookALevelInBadass: This rendition of the Pinky gains chitinous armour covering most its front that is highly resistant to all but the heaviest of guns, as well as a charge attack that can be difficult to dodge. They can be a real pain to deal with (especially if you have to fight several of them at once), particularly in ''2016''[='s=] Classic Stages where they appear in the same massive numbers as in the original games.
* VisibleInvisibility: Spectres are translucent, meaning that a sharp-eyed player should still be able to spot them.
[[/folder]]

[[folder:Lost Soul]]
!!!Lost Soul
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/img_0163.PNG]]

Floating skull demons, the modern incarnations of the Lost Soul aren't too different from their classic counterparts.
----
* ActionBomb: They blow up on-impact.
* AirborneMook: Just like their classic counterparts, they float around.
* DeathSeeker: ''Eternal'' gives this as an explanation to their ActionBomb tendencies. [[AndIMustScream Driven to madness by the circumstances leading to their undeath]], the vestiges of humanity that Lost Souls still cling onto compels them to mindlessly attack whatever they come across so that hopefully it could grant them their {{Final Death}}s. The Doom Slayer is only too happy to oblige.
* DemonicPossession: 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.
* FragileSpeedster: They move quite quickly, but go down with just a few shots.
* GlassCannon: They go down easily, but their attacks deal ''a lot'' of damage if they hit.
* SuicideAttack: Their only mode of attack, period. They can't spit plasma at you like Cacodemons or throw fire like Imps, all they can do is ''ram you.''
* TechnicolorFire: 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.
[[/folder]]

[[folder:Cacodemon]]
!!!Cacodemon
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/cacodemon.png]]

Large red floating head demons, these Cacodemons look much more like their classic counterparts than their ''Doom 3'' versions.
----
* AchillesHeel: In ''Eternal,'' they are very tough and hard to stagger, and their attacks can easily kill the Slayer in only a few hits, making them a massive threat at any range. However, they can be instantly staggered for a Glory Kill by launching a Frag Grenade or Sticky Bomb into their mouths, and it only takes a single Arbalest bolt to kill them outright.
* AnArmAndALeg: Powerful attacks can tear their arms clean off, though this has no real effect gameplay-wise.
* BreathWeapon: They spew globules of "[[InterfaceScrew psychoactive]] [[FantasticDrug narcotic]] [[HollywoodAcid bile]]", which messes around with vision and speed temporarily as well as damaging a victim. Confusingly, the [[AllThereInTheManual UAC Handbook]] instead states that [[FlipFlopOfGod they spit ball-lightning]], which is also implied by the electrical sparks that can be seen in a Cacodemon's mouth if you look closely.
* CombatTentacles: 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.
* DumbMuscle: Codex entries describe Cacodemons as being dumb beasts, driven almost exclusively by the [[HorrorHunger urge to feed]].
* EyeScream: Most glory kills involve damage to their eye.
* FeedItABomb: ''Eternal'' introduces the ability to incapacitate them by lobbing grenades into their massive mouths. You can toss a grenade into their mouths while they're charging at you, which causes them to pause for a moment and comically swell up for a second, which stuns them and makes them susceptible to a Glory Kill. If your grenade is on cooldown, then the shotgun's sticky bomb is also fair game.
* MoreTeethThanTheOsmondFamily: This version has ''four'' jaws (two horizontal, two vertical) all bristling with teeth.
* ShockAndAwe: At the very least, their projectile attack seems to have lightning elements to it.
* SpamAttack: In ''Eternal'', they can fire a rapid burst of multiple projectiles at once.
* TookALevelInBadass: They do considerably more damage with their bite attacks than before, and their spit causes InterfaceScrew should it connect.
* TruerToTheText: Although not quite as drastic a redesign as some of the other demons, the Cacodemon in ''Eternal'' is given back a number of smaller details from its classic design, such as more vibrant red skin, grey horns, a pupil in its eye and even its blue blood.
[[/folder]]

[[folder:Revenant]]
!!!Revenant
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/img_0159.PNG]]

Reanimated skeletons with the ability to fire rockets off their shoulders. Exactly why they look so humanoid is finally explained...
----
* AchillesHeel: In ''Eternal'', their shoulder cannons can be destroyed with Precision Bolts or certain explosives. This renders them into a largely-impotent melee enemy who is only slightly faster than the basic Imps.
* AirborneMook: They can fly for short periods of time.
* AndIMustScream: They are former human beings who were effectively FlayedAlive 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.
* BodyHorror: This game makes them far more disturbing than mere animated skeletons with rocket launchers.
* DeathFromAbove: They've got jetpacks that allow them to take flight and launch a barrage of missiles from the air.
* DemBones: Once-human bodies flayed down to mostly bones and guts.
* TheDogBitesBack: 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 "[[FateWorseThanDeath live]]" with constant unending agony isn't going to give them second thoughts.
* EverythingsDeaderWithZombies: Like those first few test subjects who became Possessed in the name of scientific experimentation, Revenants are [[HumanSacrifice human sacrifices]] who were brutally mutilated to death, upgraded with cybernetic implants, and then brought back to life with demonic energies.
* {{Fatality}}: If they defeat the Doom Slayer, they will [[AnArmAndALeg rip off both of his arms]], [[GrievousHarmWithABody slap him with one of his own arms for added insult]], and then crush his skull with a single punch.
* HomingProjectile: One of the rockets he can launch.
* HumanSacrifice: As with the Possessed, they were humans who ''volunteered'' to be butchered and reanimated to become the UAC's deadly new living weapons.
* JumpJetPack: 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.
* MacrossMissileMassacre: They can shoot a ''lot'' of rockets, very quickly.
* MascotMook: For the [[LimitedSpecialCollectorsUltimateEdition Collector's Edition]] for the 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 30cm[[labelnote:In Imperial]]12-inches[[/labelnote]]-tall statue of one.
* SuperSoldier: What they were intended to be following their investigation into the effects of Lazarus Wave exposure on human test subjects, this time being cybernetically augmented before being turned into pseudo-demonic undead warriors in the UAC's arsenal of weaponised demons.
* TookALevelInBadass: Revenants were already considered a pain in the ass in the original games. Here they have ''jetpacks'', allowing them to quickly move across large distances and fly up to rain down missiles on players who try and hide behind cover.
* TurnedAgainstTheirMasters: 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?
* WasOnceAMan: They ''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.
[[/folder]]

[[folder:Mancubus & Cyber-Mancubus]]
!!!Mancubus & Cyber-Mancubus
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/img_0158_8.PNG]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/cyber_mancubus.png]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/mancubus_4.png]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/cyber_mancubus_6.png]]
[[caption-width-right:350:From top to bottom: The Mancubus and Cyber-Mancubus in ''DOOM (2016)'', the redesigned Mancubus and Cyber-Mancubus in ''Doom Eternal'']]

Morbidly obese 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.
----
* AchillesHeel: In ''Eternal'', they are hideously tanky, even by the standards of their fellow heavyweight demons; their arm cannons let them function as an anti-aircraft cannon, keeping you from moving too freely around the arena. However, if you blast off their arm-cannons with a weak point-buster (Sticky Bomb, Precision Bolt, Ballista standard fire) or enough rounds from any other weapon, they can only fire pathetic fireballs that don't explode and whistle like a firework. They also lose their devastating close-range flamethrower attack, making them easy to kite.
** The Cyber Mancubus naturally amps both of these attributes up to eleven, but in return, has an even more easily-exploited weakness; a single Blood Punch will tear off ''all'' of their armour and most of their HP, exposing their huge guts to retaliation.
* {{Acrofatic}}: Mancubi [[MightyGlacier aren't exactly fast]], but they're just as agile as any other demon when it comes to traversing the battlefield. It can be quite the shock when you believe yourself safe on a ledge above them, only for the beast to simply jump up to you despite their paunch and stubby legs.
** In fact, in Battlemode of ''Eternal'', Mancubi are actually some of the more agile demons out there, with surprisingly brisk movement speed and even a DoubleJump. With the right upgrades and ability boosts, a Mancubus player can outrun the Slayer himself.
* AndShowItToYou: One of their Glory Kill options involves ripping out their heart and then [[AutoCannibalism stuffing it down their throats]].
* ArmCannon: In ''2016'', the regular Mancubus has organic arm cannons that form naturally, while the Cyber variant has them replaced with UAC-made cannons. In ''Eternal'', both variants are equipped with man-made arm cannons.
* BodyHorror: It's stated that their arm cannons are chitinous growths that envelop their hands and squirt a noxious, flammable effluvium derived from their own decaying flesh, creating bizarre biological flamethrowers.
** The general design of the Mancubus is quite horrific as well. Apart from the obvious fact that they are demons, they are so horrifically obese that their stomachs usually appear to have burst at some point and ''stapled'' back together.
* ColorCodedForYourConvenience: In addition to being slightly larger, the Cyber-Mancubus has had its chitinous armour replaced with teal-green UAC technology, complete with green bioluminescent lights on its body as opposed to the regular's red.
* {{Cyborg}}: The Cyber-Mancubi, as is in their name, who have been enhanced with UAC technology such new weapons replacing their organic flamethrowers and armour plating grafted to their flesh. This has become standard for regular Mancubi in ''Eternal'', and their redesign explained in their codex as the UAC Cultists having done man-made cybernetic modifications to improve upon their fighting power and armour without going to the extent of the Cyber-Mancubi.
* DamageSponge: They can suck up a ''lot'' of ammo before going down.
* DecompositeCharacter: In most ''Doom'' games the Mancubi are otherwise organic creatures with cybernetic guns. This game splits them into two kinds: the entirely organic Mancubi and the far more visibly enhanced Cyber-Mancubi. Both return in ''VideoGame/DoomEternal'', though are now directly based on the classic Mancubus appearance-wise.
* DiscardAndDraw: Their Cybernetic variants in ''Eternal'' play this trope straight. On the one hand, their cannons can no longer be destroyed by the Precision Bolt, and they can leave behind damaging pools of acid with their attacks. On the other, they lose their close-range flamethrower.
* DoubleJump: In ''Eternal'', they are capable of this in Battlemode, though as a trade-off, they won't be able to shoot until they land again.
* FatBastard: Larger than most demons, and so fat that their natural armour is incapable of fully protecting them. Humorously, according to one of its Codex entries, the UAC ''tried'' to remedy this with all-encompassing armour [[FailureIsTheOnlyOption but the Cyber-Mancubi kept outgrowing said armour anyway.]]
* FeedItABomb: Glory kill a Mancubus and the Doom Slayer pulls out a piece of its flammable innards, and shoves it in the beast's mouth, blowing it up.
* GiantMook: They're one of the biggest demons in the game.
* GroundPound: Mancubi can do this to attack you if they feel you're too close.
* IronicName: Part of their name references the rather good-looking [[HornyDevils succubus or incubus]]... these guys are ''[[FatBastard anything but good looking]]''. Moreover, they're associated with Gluttony rather than Lust.
* JigglePhysics: On their bellies.
* {{Kevlard}}: The Mancubus is the beefiest demon in Battlemode HP-wise, which is understandable considering their significant girth. That is not to say they're MadeOfIron, however; their increased HP simply allow them to stand against the Slayer for a bit longer than the smaller demons, not tanking rockets and Ballista shots all day.
* MadeOfPlasticine: If you have a Blood Punch loaded in ''Eternal'', you can run up to a Cyber-Mancubus and punch it once to break through all of its armour in a single hit, making the rest of the fight a lot shorter (it's weaker than a regular Mancubus once its armour is down).
* MightyGlacier: They fill this role on the battlefield. They can withstand more punishment than almost any other non-boss enemy, and their damage output can be frightening, but they are some of the slowest, most formulaic enemies in the game, making them both predictable and easy to outrun.
* NonIndicativeName: Rather than being the SpearCounterpart to succubi, they're heavily associated with gluttony. They're {{Fat Bastard}}s with twin {{Arm Cannon}}s that spew fireballs (or globs of HollywoodAcid in regards to the Cyber-Mancubus), not HornyDevils.
* OrganicTechnology: The Mancubi have organic {{Arm Cannon}}s. Inverted with the Cyber-Mancubi, who use cybernetic cannons akin to the "old school" Mancubi, and averted completely with the design of both variants in ''VideoGame/DoomEternal'', being directly based on the classic Mancubus appearance (with Cyber-Mancubi featuring a layer of cybernetic armour).
* PlayingWithFire: They're armed with two flamethrowers.
* PoisonousPerson: 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 [[PoisonIsCorrosive highly corrosive]], leaving sizzling pools of the stuff wherever they land. Combined with its ability/preference to fire these globs from longer distances, this makes the Cyber-Mancubus just as lethally effective as its organic counterpart.
* RocketJump: This is how they boost themselves up to elevated positions, by literally using their {{Arm Cannon}}s as thrusters.
* SmokeOut: In ''Eternal's'' Multiplayer Battle Mode, it possesses the ability to launch Smoke Bombs to hide from the Doom Slayer so they can retreat or attack in secret.
* TookALevelInBadass: Unlike the classic games, 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.
* TruerToTheText: As seen above, Mancubi are given the most dramatic redesign of the demons in ''Eternal'', ditching the chitinous cyclops appearance of ''2016'' for the classic "fat ogre" form, with cybernetic arm cannons instead of OrganicTechnology. Cyber-Mancubi follow suit, distinguished by their green hue and a layer of cybernetic armour applied to most of their bodies.
* WalkingWasteland: {{Downplayed}}; the bile fired by the Cyber-Mancubus will create a toxic pool that damages anything that enters it whilst it lingers.
* UndergroundMonkey: There's both the regular Mancubus and the Cyber-Mancubus, the latter of which has had its chitinous armour/[[ArmCannon Arm Cannons]] replaced with green metal plating, mechanical {{Arm Cannon}}s, and is also outfitted with a fancy technological helmet to better visually distinguish it. In true UndergroundMonkey 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.
[[/folder]]

[[folder:Hell Knight]]
!!!Hell Knight
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/img_0155.PNG]]
[[caption-width-right:300:''2016'' design]]
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/hell_knight.png]]
[[caption-width-right:300:''Eternal'' redesign]]

Bearing a close resemblance to their ''VideoGame/Doom3'' counterparts, Hell Knights are hulking, yet surprisingly swift bruisers who will turn the Doom Slayer into paste should they get their hands on him. They are also one of the only demon types to respect hierarchy, so any plans that hell has beyond blindly attacking everything is enforced through them and the Barons.
----
* AdaptationalWimp: Sort of. They are still a somewhat potent threat, but have lost their powerful ranged attacks from previous games completely.
* AchillesHeel: In both ''2016'' and ''Eternal'' - they are very strong and very fast, but they are extremely predictable in their attack patterns. They're also VERY large, making them hard to miss. They're easy to shut down as long as you stay out of their reach. Things get even worse for them in ''Eternal'', where the Slayer's new dash ability lets him effortlessly kite around them even in close quarters.
* TheBrute: Hell's version of it. Hulking, straightforward and completely focused on melée combat.
* TheBigGuy: Not as big as bosses or even the Barons, but still several measures taller and more muscular than any other imps.
* BodyHorror: Hell Knights seem to have exposed flesh on several parts of their body.
* CantCatchUp: A particularly literal example; as mentioned above, they are one of the only returning enemies from ''2016'' who don't get any new moves. They're slightly faster, but that's about it. This leaves them at the mercy of the Slayer's greatly-enhanced mobility; his Dash allows them to be easily dodged, baiting them into fruitless leaps that leave them wide open for retaliation.
* GoodOldFisticuffs: Using their huge size to their advantage, they primarily attack using their enormous strength, given that they no longer have the ranged attacks their classic versions had.
* CloseRangeCombatant: Unlike his classic and ''Doom 3'' counterparts, the modern Hell Knight has no ranged attacks, but compensates with his high speed and immense strength.
* DivergentCharacterEvolution: Hell Knights in ''Doom II'' were {{Palette Swap}}s of Barons of Hell with lower health. In ''Doom 3'', they received a major redesign and took a similar role as the Baron of Hell did in the original games. Come ''2016'', they've become a tough CloseRangeCombatant that lacks the projectile attack that previous versions had.
* EliteMooks: Are the primary enforcers of the Archdemons, and you'll quickly find out why if you let them touch you.
* EyelessFace: Hell Knights in ''2016'' have no (visible) eyes, but {{Averted}} in ''Eternal'', which redesigns them to have glowing yellow eyes.
* {{Fatality}}: Being killed by a Hell Knight in ''2016'' will net you a first-person scene of it crushing you to a pulp with three {{Megaton Punch}}es.
* LightningBruiser: 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. The Slayer is still somewhat faster, but you will be tested in your effective maneuverability when dealing with these guys (as, get backed into a corner when they are about to do their ground pound, and you ''will'' be hurting).
* SkullForAHead: Their faces distinctly resemble that of a human skull, except for the eye sockets and ridiculous amount of muscle surrounding it.
* ShockwaveStomp: Their preferred attack when you're too far away for a basic punch is an enormous leap that's followed by an earth-shaking landing that deals heavy damage to anything caught in the blast.
* SmashMook: Hell Knights have lost their ranged attacks, but make up for it with their speed and agility.
[[/folder]]

[[folder:Baron of Hell]]
!!!Baron of Hell
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/img_0156.PNG]]
[[caption-width-right:300:''2016'' Baron of Hell]]
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/baron_of_hell_3.png]]
[[caption-width-right:300:Fireborne Baron]]

Members of Hell's ruling class, the Barons are among the most powerful demons in the game, with their design harkening back to the classic games. The ones faced in ''Eternal'' are also known as "Fireborne Barons", a specific clan from the banishing grounds bordering the Burning Abyss who have fused with the incendiary matter of Hell itself.
----
* AchillesHeel: They take the size and speed of a Hell Knight and couple it with a devastating ranged attack. However, they handle differing elevations poorly; if you're on the same level as they are, watch out, but getting to higher elevation requires them to take the time to leap up themselves, allowing you to punish them without retaliation.
* AlienBlood: In ''Eternal'', the Fireborne Barons bleed ''liquid hot magma''. Justified, given the Fireborne Barons fused with Hell's matter from their environment.
* AuthorityEqualsAsskicking: Are among the highest-ranking demons in Hell, and boy, do they earn it.
* BigRedDevil: Just like his classic counterpart, the ''2016'' version is a big red demon with horns and hooves. The Fireborne Barons play with this a bit; it loses the red colouring until you damage it enough to reveal its bright burning insides.
* BladeBelowTheShoulder: The Fireborne Barons have a flaming blade attached to each arm.
* ElementalEmbodiment: Essentially what the Fireborne Barons of ''Eternal'' are; the embodiment of Hell's matter from the environment they resided in.
* EliteMooks: Are the strongest non-boss enemy in ''2016'', and remain one of the toughest in ''Eternal''. In Battlemode, they serve as the strongest NPC demon that player demons can summon.
* {{Fatality}}: If you're killed by a Baron in ''2016'', it will knock you to the ground, pin you under a hoof, and then [[AnArmAndALeg rip off both your legs]]. Then it'll [[FacePalmOfDoom grab your head in one hand and crush it]].
* {{Fireballs}}: Their ranged attack is a flaming projectile (green in ''2016'', fiery orange and red in ''Eternal'').
* GroundWave: In ''2016''[='s=] multiplayer, the Baron of Hell loses his ability to throw fireballs but can pound the ground to launch a row of rock spikes in front of him.
* LargeAndInCharge: Are both the largest and highest-ranking non-boss demons in ''2016''. They're dwarfed by Tyrants in ''Eternal'', but are still up there in terms of both size and position in Hell's social hierarchy.
* LightningBruiser: Despite their massive bulk, the Barons are pretty damn swift and agile, even if an attentive Slayer can still outmaneuver them. Taken to its extreme in ''Eternal'', where they are even tankier but have lost none of their agility.
* MagmaMan: The Fireborne Barons in ''Eternal''. As the player deals damage to them, their ashen grey hides [[ShowsDamage crack away]] to reveal a molten, skeletal core.
* PlayingWithFire: The Fireborne Barons have far more flame-themed attacks compared to their regular counterpart.
* PraetorianGuard: The ''2016'' codex states that they are the Royal Guard of the current Dark Lord.
* ShockwaveStomp: Like the Hell Knight, they can perform an enormous leap that creates a massive shockwave wherever they land.
* TookALevelInBadass: Barons in ''2016'' are pretty tough, but not significantly more so than other elite demons. The Fireborne Barons of ''Eternal'' are "Super Heavy"-tier demons capable of tanking a BFG blast.
* TruerToTheText: {{Subverted}}. ''Eternal'' introduces the Fireborne Barons who come from a Baron clan of [[MagmaMan Magma Men]], who have an obsidian carapace, natural flaming arm blades, and are basically embodiments of Hellfire itself.
[[/folder]]

[[folder:Summoner]]
!!!Summoner
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/img_0166.PNG]]

Floating, rapidly moving demons that can conjure up other demons and fires damaging beams of unfiltered Argent energy. Essentially the ''2016'' equivalent of the Archvile from the classic games; as such, they aren't seen in ''Eternal'', where [[TheBusCameBack the original shows up to show us how it's done.]]
----
* EliteMooks: Said to be a very advanced offshoot of the Imp.
* EnemySummoner: ExactlyWhatItSaysOnTheTin. It summons demons to help out on the battlefield.
* HalfTheManHeUsedToBe: They can inflict this on the Doom Slayer if their red shockwave attack deals him the killing blow.
* LightningBruiser: Not the strongest demon, but it has a fairly quick attack, moves very rapidly among the demons it summons, and can take quite the beating.
* PowerFloats: Summoners have atrophied legs without feet, so they would be incapable of walking even if they wanted to.
* {{Roboteching}}: They're one of three specific demon species that you must seek out to attain Mastery one of your weapon mods. Five Summoners must be killed with the Rocket Launcher's [[SuperPersistentMissile Lock-On Burst]] upgrade, a task that often results in hilarious missile trajectories as the warheads chase the incessantly teleporting freak around the battlefield.
* SuspiciouslySimilarSubstitute: It essentially served as ''2016'''s version of the Archvile before being PutOnABus for ''Eternal'' in favour of bringing back the Archvile. Allegedly, in early versions of the game, the Summoner was originally going to actually BE the Archvile, but the name was changed before release for unknown reasons.
* TeleportSpam: They teleport around rapidly to avoid you.
[[/folder]]

[[folder:Prowler]]
!!!Prowler
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/prowler.png]]

Swift and agile Imp-like demons who are expert hunters and ambushers. While in ''2016'' they only appear in the multiplayer as a playable demon, they return as standard enemies in ''DOOM Eternal''[='s=] campaign.
----
* AchillesHeel: Being frozen will lock them in place, and despite requiring three chainsaw fuel pips to kill in ''Eternal,'' they are fairly squishy. The trouble is hitting them.
* AscendedExtra: From a multiplayer-only monster in ''2016'' to an actual campaign enemy in ''Eternal''.
* CeilingCling: In ''2016''[='s=] multiplayer, they can latch onto walls and ceilings to better maneuver around the battlefield.
* EliteMook: Despite their Imp-like appearance, they're classified as a "Heavy" demon in ''Eternal''. While both species employ similarly evasive combat tactics, Prowlers are far stronger and tougher (requiring three pips of fuel to kill with a chainsaw), have a SpreadShot attack for when you're mid-distance and can teleport all over the place.
* ExtraEyes: They have three eyes arranged in a crude right-pointing triangle shape on their forehead.
* FragileSpeedster: They have just a little bit more health than Imps, but their teleportation powers (as well as their ability to climb and swing like ComicBook/SpiderMan in the multiplayer) makes them perhaps the most agile demons in Hell's armies.
* GameplayAndStorySegregation: The Codex states that they prefer to hunt alone, as it gives them more precision to take down their enemies. In the game, you ''only'' encounter them in packs and/or in the company of other demons. In all fairness, when your foe is [[TheDreaded the Doom]] [[PersonOfMassDestruction Slayer...]]
* GlassCannon: Played straight in ''DOOM 2016'', where if you get can get a bead on one, it'll go down pretty easily, but if it gets up close to you, ''all'' of its attacks are {{One Hit Kill}}s. Zigzagged in ''Eternal''; in the upper difficulties they can occasionally survive a point-blank super shotgun blast (whereas Imps still get [[ChunkySalsaRule salsa]] [[LudicrousGibs chunked]]), but they are still the weakest of the Heavy-class demons.
* InASingleBound: They can jump around rapidly in great distances.
* MonstrousMandibles: They have a tripartite jawline, with the lower jaw opening vertically as well as horizontally.
* MoreTeethThanTheOsmondFamily: Their mouth is lined with sharp teeth.
* OhCrap: One of its ''Eternal'' Glory Kills plays this in a hilariously realistic fashion. Doomguy slices its arm off with the Doomblade, and for the second or so before he finishes it off, it can only stand there screaming in fear and pain at the wound.
* SpreadShot: In ''Eternal'', they are able to fire purple energy projectiles, sometimes charging them to fire three of them at once in a spread.
* TeleportSpam: In ''Eternal'', they are given the ability to teleport. They abuse it with ruthless efficiency to dodge your attacks and sneak up behind you.
* TookALevelInBadass: While Prowlers can no longer one-shot players in ''Eternal'', they are now able to fire purple projectiles and teleport all over the place.
* XRayVision: The Prowler in ''2016''[='s=] multiplayer has the ability to see enemies through walls, better allowing it to evade and ambush you. This is referenced in the codex of ''Eternal'', where they are said to be excellent ambush hunters that can see prey through cover.
[[/folder]]

[[folder:Harvester]]
!!!Harvester
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/harvester.png]]

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 lightning 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.
* LifeDrain: Its primary mechanic is its ability to leech health for itself from opposing players.
* SpreadShot: After using its life drain lightning to fill up its meter, it can then launch a spread of five large plasma shots similar to the BFG, each with the capacity to one-shot other players.
[[/folder]]

!!Introduced in ''Doom Eternal''
[[folder:Gargoyle]]
!!!Gargoyle
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/gargoyle_9.png]]

Imp-like demons with wings on its back, allowing it to fly.
----
* AcidAttack: They launch globs of acid instead of fireballs like Imps, and can fly to rain down a dozen acid balls at once.
* AirborneMook: They make good use of their wings in combat, hovering high in the air to rain down acid from relative safety. The Codex also mentions that the Gargoyles were a real pain for the Night Sentinels to deal with, as their ability to fly meant that they could easily bypass city defences and snatch up unsuspecting civilians.
* BladeBelowTheShoulder: Their arms end in two scythe-like appendages they use in melee combat. With the right Glory Kill, the Doom Slayer can cleave their head in half with their own scythe.
* BodyHorror: A closer look at the Gargoyle reveals that their arm scythes don't look to be a natural part of their anatomy, given that they appear to be misshapen metal blades crudely grafted in their forearms, bisecting their hands. All that gore coating the Gargoyle's arms is probably as much from them as it is from their victims.
[[/folder]]

[[folder:Arachnotron]]
!!!Arachnotron
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/arachnotron.png]]

Giant, brain-shaped demons fused to a spider-shaped cybernetic frame, they come equipped with a plasma turret and a pair of grenade launchers.
----
* AchillesHeel: They are ferociously powerful mid-range combatants who can lock the Slayer down with their plasma turret, but said turret can be destroyed with a Precision Bolt, Ballista shot, or shotgun-launched grenade. This renders them largely impotent - they are slow, easy to hit, and have no other ranged attacks besides a grenade launcher that roots them in place when they use it.
* AIIsACrapshoot: They were originally created by the [=UAC=] as part of another project to weaponize demons, building a factory to clone them on a production line [[spoiler:using the Spider Mastermind's genetic material]]. While the operators inevitably got slaughtered by a demonic outbreak, the fully automated and AI-governed factory continues to mass-produce new Arachnotrons.
* BizarreAlienBiology: Their ribcage is ''inside of their brain.''
* BrainMonster: Like the Spider Mastermind, they resemble demonic brains with vestigial limbs mounted on SpiderTank bodies. Justified, [[spoiler:since they are clones created from the tissue of the original Spider Mastermind]].
* TheBusCameBack: After being absent from the franchise for more than a decade, Arachnotrons return for ''VideoGame/DoomEternal''.
* {{Cyborg}}: Its legs are robotic, while its body is a giant demonic brain.
* DegradedBoss: They're a {{Mook}} version of the Spider Mastermind from ''2016''.
* EyeScream: The Doom Slayer can impale their eyes with their own legs during a Glory Kill. Doing this from the back makes the Slayer skew both of the Arachnotron's eyes that way.
* FeedItABomb: One of the Glory Kills the Slayer can perform on an Arachnotron has him prying open one of its launchers to get a grenade, and then stuffing it into the thing's mouth, where it promptly explodes.
* GiantSpider: They're demonic spider-esque monsters that are the size of a truck.
* GrenadeLauncher: Fires a quartet of grenade launchers if its turret gets broken.
* MyBrainIsBig: Unlike most instances of this trope, it doesn't seem to give them any psychic powers, but it still takes up a solid 70% of their body!
* WallCrawl: Unlike their classic counterparts, Arachnotrons in ''Doom Eternal'' can crawl over pillars, walls and ceilings using their giant spiked legs.
* WeakTurretGun: Downplayed, since their tail turrets do take some shooting to destroy. Surefire methods of destruction usually involve a well-placed sticky bomb or Precision Bolt.
[[/folder]]

[[folder:Carcass]]
!!!Carcass
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/carcass.png]]

Cybernetically-augmented human corpses that have fallen victim to the demonic forces.
----
* AchillesHeel: Their shields are vulnerable to the same overcharging effects as the Riot Soldier's, and its' explosion when destroyed is much bigger; this means that they often [[UnwantedAssistance endanger their allies FAR more than they help them.]]
* ArtificialZombie: They are human carcasses that are reanimated and fitted with cybernetics, just like the Revenants.
* BarrierWarrior: The Carcass can erect a wall of plasma energy that will block the Doom Slayer's shots against itself or other demons, primarily as a deterrent against the rocket launcher, as well as just blocking the path of the Slayer himself. It can do this from all the way across an arena, but the projection leaves a trail of electricity that leads to its location.
* BodyHorror: Bloated, rotting upper bodies of human corpses, merged with the machinery that once again brings them life and unceremoniously attached to a three-legged cybernetic chassis.
* BalloonBelly: Notably obese, due to decomposition.
* {{Cyborg}}: The lower half of its body is completely mechanical, and even the upper half has been augmented with cybernetics.
* FatBastard: Its upper torso is stuffed with cybernetics and bloated with decomposition, giving it a corpulent appearance.
* FightingClown: Despite its grotesque appearance, it gets characterized as one. It flails about for its melee attacks, jumps and scampers around to avoid direct conflict, and its ranged attack involves using waves generated from its torso while it essentially jams out to the music.
* GroundWave: It can fire its shield cannon into the ground to launch a short-range shockwave at the Slayer.
* SpiderLimbs: The human-like upper body of the Carcass is stuck to three cybernetic legs.
* SpinAttack: Its melee attack involves it spinning its upper body around while sticking out its arms.
* SlasherSmile: They all appear to have open-toothed grins full of rotted teeth, most likely from a combination of decomposition and their transformation.
[[/folder]]

[[folder:Dread Knight]]
!!!Dread Knight
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/dread_knight_9.png]]

Hell Knights that are enhanced with various cybernetics.
----
* AchillesHeel: They aren't quite as fast as their unmodified counterparts are, and their tendency to launch ranged attacks means that they will often be left behind by both their fellow demons and the Slayer as the battle moves around the arena. They're also susceptible to MoreDakka, courtesy of the Chaingun.
* BladeBelowTheShoulder: Has a LaserBlade attached to each wrist.
* {{Cyborg}}: While functionally similar to Hell Knights, Dread Knights stand in stark visual contrast as their flesh has been meshed with cybernetics, with their arms, in particular, being replaced by ArtificialLimbs equipped with energy blades.
* EliteMooks: Are far stronger than the standard [[SmashMook Hell Knights]], forming a bridging point between them and the Barons of Hell. They also lose some of their predecessor's weaknesses - they gain both a ranged attack and a wide-reaching sweeping slash that covers a large radius around them, making kiting them a hazardous proposition. Their leaps even create pools of electrified plasma that can still damage you and restrict your movement, even if they miss.
* MoreDakka: Their weakness, as is handily demonstrated by a particular section in ''Super Gore Nest'' where you're [[NewWeaponTargetRange dropped into a small arena with one right after obtaining the chaingun]]. Two seconds of concentrated rapid-fire will bring it down.
* ShockwaveStomp: Its leaping stomp attack as been upgraded to unleash red lightning in a wide area around itself, creating a floor hazard that damages anyone who goes over it.
* SuperSoldier: They are essentially Hell's version of this: they are faster, tougher and stronger than normal Hell Knights, juiced up with massive doses of epinephrine (in layman's term, adrenaline) to keep them in an unbroken state of bloodlust and injected with artificial dopamine for every kill they get, making them even more eager to disregard their lives for the sake of battle.
* SwordBeam: They can throw these at you with their arm blades if they can't catch you.
[[/folder]]

[[folder:Pain Elemental]]
!!!Pain Elemental
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/pain_elemental.png]]

Powerful, floating one-eyed demons that can launch multiple Lost Souls.
----
* AchillesHeel: They're slower and larger than their fellow flying heavies, Cacodemons; they also lack their devastatingly powerful bite, and their projectiles can be shot down, unlike the lightning balls the Caco spits. Additionally, they share the Caco's weakness to the Ballista's Arbalest mod, going down in two shots to of the Caco's one.
* AndIMustScream: According to the Codex, their entire existence is devoted to forging Lost Souls within their stomach, which is an understandably excruciating process.
* BarrierWarrior: In Battlemode, where it can summon a Soul Shield made up of Lost Souls to not only protect itself against attacks but launch at the Doom Slayer.
* BizarreAlienBiology: Much like the Cacodemons and Arachnotrons, their skull contains their ribcage.
* TheBusCameBack: After being absent from the franchise since ''Doom 64'' (released in 1997), they're back for ''VideoGame/DoomEternal''.
* {{Cyclops}}: Only has one big red eye in the middle of its giant head, or rather, body.
* EliteMook: Serves as an upgraded, tougher version of the Cacodemon. However, the same tactics to stagger a Cacodemon (launching a grenade or Sticky Bomb into its mouth) will not work on Pain Elementals.
* EyeScream: All the Glory Kills on them involve the Doom Slayer doing something horrible to their eye, with one involving the Slayer stabbing up through their upper jaw and impaling their eye with such force that it goes straight out of their head.
* FastballSpecial: Sometimes, a Pain Elemental will just grab one of its Lost Souls and straight-up chuck it at you.
* FateWorseThanDeath: The Pain Elementals are said to be abhorrent beasts from the depths of the Umbral Plains, cursed to eternally forge Lost Souls in their gut, which causes them such excruciating, everlasting pain that the only way they can relieve it is to kill indiscriminately and spread suffering.
* GrumpyOldMan: Was designed to look as if it had such a disposition. Given its codex entry, it has every right to be a bit surly.
* HornsOfVillainy: Their head is crowned with a number of small ones, as well as a particularly impressive main pair.
* MagicMissileStorm: Its main form of attack is launching Lost Souls at you.
* MonstrousMandibles: Has two jaws and no less than ''8'' toothy mandibles. Its "Big Mouth" emote displays its huge, horrendous maw as it roars.
* MookMaker: Played with; besides a melee swipe for self-defence, its attacks all involve summoning Lost Souls. However, unlike in classic ''Doom'', these Lost Souls function more like projectiles rather than enemies with independent AI.
* WaddlingHead: 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 [[https://78.media.tumblr.com/f33ae80cb3154875985e260040642e56/tumblr_pd99swUIeg1qh1rfpo1_500.gif pantomime various motions that make it look like it's stomping through the air towards you]], as a tongue-in-cheek reference to their [[https://78.media.tumblr.com/ae3a96bb1672cf1f1441fd20b9a60ae4/tumblr_inline_p8y7iqnppj1s408j9_400.gif animations from the original game]], which look like the Pain Elemental is walking with invisible legs.
[[/folder]]

[[folder:Whiplash]]
!!!Whiplash
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/doomwhiplash.jpg]]

Female snake-like demons with cybernetic augmentations that wield a pair of bladed whips.
----
* AchillesHeel: They prioritize getting up close and personal with the Slayer, which works great - until you get the Super Shotgun. They also make no effort to avoid explosives launched into their intended path of travel, which makes it easy to trick them into moving right into a primed grenade.
* BodyHorror: Judging from appearance, they were once organic beings, but their transformation has led to literally everything below their chest, as well as their arms to be severed and replaced by cybernetics.
* BladeBelowTheShoulder: Their whips are launched from within their forearms.
* LightningBruiser: The Whiplash is an extremely evasive enemy that can easily slither through your projectile attacks, deal quite a bit of damage with her whips, and take quite the beating before going down.
* OneGenderRace: All Whiplashes are female, according to WordOfGod.
* SnakePeople: The snake part is cybernetic, but it's implied that they were all biologically snake-like even before the UAC augmented them.
* WhipItGood: The Whiplash is equipped with a pair of presumably Argent-powered whips that she can use to both attack from afar and [[BuildingSwing maneuver around the environment]].
[[/folder]]

[[folder:Archvile]]
!!!Archvile
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/arch_vile.jpg]]

High-ranking demons with the power to control flames and summon and empower fellow demons.
----
* AchillesHeel: Their strongest attacks require them to stay in place, and teleportation notwithstanding, they are incredibly slow compared to their fellow demons. If you can close to quarters with them, the Slayer's absurd damage output lets him obliterate them into kibble within moments.
* AdaptationalWimp: Compared to their original iteration, the new Archviles have lost some of the power that made them so painful to fight in the original ''[[VideoGame/{{Doom}} Doom II]]''. Not that they are any easier to deal with, though, but still:
** For starters, their fire attacks, while still very damaging, are nowhere near as deadly as they used to be. Originally, an Archvile's flame attack has a pretty far range (896 units, further if you damage him and he retaliates), is only limited to his line-of-sight, and deals a ''lot'' of damage (20 for the initial zap that launches you upwards, and ''70'' for the ensuing explosion. Given that you're a lot more vulnerable back then, this is often life-threatening), on top of flinging you into the air when it connects, making engagements risky without ample cover. Now, the thing seems to prefer staying in the background and can only deal with the bulk of its damage up close.
** Secondly, it can no longer spam its revival ability, whereas the original Archvile checks for a valid corpse ''every time its sprite frame changes'' and resurrects it, thus potentially creating an unending wave of fresh demons to fight you. In fact, this power has been completely removed in exchange for turning the Archvile into an EnemySummoner and mobile buff totem, which is still an absolute pain in the ass, but much less of a resource drain on you due to the new gameplay changes making it easier to gain health and ammo back.
* AreaOfEffect: If you stay too close to an Archvile, it will turn the area around itself into a sea of flames. Like in the original games, it can also instantly turn the Slayer's current location into a raging inferno, though this time, the attack can be avoided by simply moving away from the spot in question. In Battlemode, this ability is called "Lake of Fire" and can be summoned to any location the Archvile player's crosshair is pointing at.
* ArrogantKungFuGuy: In the Phobos reveal trailer, he reacts to the Doom Slayer, not with fear or blind rage, but as if he were called in to do pest control rather than kill the guy who makes Hell bend down to its knees.
* AssKickingPose: Will raise its flaming hands into the air, Randy Orton style, when summoning fire, [[CallBack much like in the original games]].
* AuthorityEqualsAsskicking: Is stated by its codex entry to be among Hell's royalty, and is one of the most powerful demons on the roster.
* DeployableCover: Can produce a flaming shield that's impervious to attacks (unless you Blood Punch it) and impassable by the Slayer; while in the campaign the Archvile has to stand still to maintain its shield, in Battlemode it can simply deploy the shield and move on (or through it).
* EliteMooks: Serves as the upgraded replacement of the Summoner in ''Eternal''.
* EnemySummoner: If left alone in Campaign, it will continuously summon waves of new enemies. It can even summon its fellow ''Super Heavies'' given enough time.
* GroundWave: Its primary attack at a close-medium range in the campaign is to launch fast-moving waves of flame along the ground.
* LargeAndInCharge: Archviles descend from the oldest race of demons and with their superior intellect and psychomancy they are natural rulers of Hell's savage forces. They also tower over most other demons that aren't Super-Heavy types.
* MookDebutCutscene: Subverted. Despite pre-release footage showing the Archvile making a dramatic entrance on Phobos, in the actual game it first appears in Taras Nabad with so little fanfare that you might not even notice it's there until you see other demons being buffed or summoned.
* MoreTeethThanTheOsmondFamily: Has a mouthful of jagged, pointy teeth.
* OhCrap: Archviles are among the demons that are most blatantly afraid when you Glory Kill them, shrieking in clear terror or trying to get away from the Doom Slayer before he finishes them.
* PlayingWithFire: Its abilities are primarily flame-based.
* SecretAIMoves: Player-controlled Archviles do not use a fire wave attack like in the single-player, nor do they function as walking Buff Totems (outside of an attack boost ability available to all player-controlled demons).
* ShockAndAwe: The Archvile also possessed a few lightning powers in pre-release multiplayer gameplay. This did not make it into the final build.
* SquishyWizard: Subverted; the Archvile may be a caster, but it is ''far'' from squishy. While it is less beefy than the other Super Heavies, it still has a considerable amount of health, so much so that it can sometimes tank a ''BFG'' shot, ''point-blank''. Played straight in Battlemode, however.
* TeleFrag: Faltering an Archvile while it's trying to summon will make it botch the process, instantly gibbing the would-be summons.
* TeleportSpam: It possesses the ability to teleport, though at least in Battlemode, this is restricted to anywhere in its line-of-sight as long as the path isn't obstructed.
* TookALevelInBadass: While the Archvile was always a nightmare to deal with in earlier titles, the ''Doom Eternal'' incarnation of the infamous demon boasts a whole suite of new powers, ranging from covering the ground around itself in flame, barely flinches even if bombarded with rockets, to teleporting around and giving significant power boosts to any demon in its vicinity.
* TurningRed: Not the Archvile itself, but it does this to all the enemies in the area whenever it's around, casting a StatusBuff that turns enemies red and on fire and more importantly increases their health and damage. It even increases their resistance to the Doom Slayer's [[OneHitKill Chainsaw]], requiring more fuel to use it against them unless you find and kill the Archvile.
[[/folder]]

[[folder:Marauder]]
!!!Marauder
!!!'''Voiced by:''' Edward Bosco

[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/marauder.png]]

->''"You were never one of us. You were nothing but a usurper. A false idol. My eyes have been opened. Let me help you to see, Slayer."''
\\
Former Night Sentinels who remained loyal to Khan Maykr despite her consorting with Hell. Resurrected by Hell, they serve as the antithesis to the Doom Slayer.
----
* AchillesHeel: They're fast, tanky, and hit like a runaway freight train, but they have exploitable weaknesses just like every other demon.
** While they can block any direct damage thrown their way, they can't do a thing about splash damage; plastering the area around them with grenades, sticky bombs, rockets and Arbalest bolts from the Ballista will rapidly blow away large portions of their health.
** They can't summon wolves unless they block damage with their shield.
** They can be chain-staggered by efficient usage of weapons with high burst damage such as the Super Shotgun, Ballista and Rocket Launcher, either killing them in one hit (see Alpha Strike below) or leaving them in a staggered state ripe for a glory kill.
* AlphaStrike: The fastest way to kill a Marauder (without using the BFG) is to bait out his attack, then hit him with ''[[TheresNoKillLikeOverkill absolutely everything]]'' in your arsenal while he is staggered, keeping him off balance with a series of explosions (particularly those capable of staggering demons), shotgun blasts and Ballista shots. Keeping him off-balance is critical to this strategy, as once he regains his composure, his shield will negate any damage you can throw at him and you'll be getting a super shotgun blast to the face for being at the range necessary to pull this off.
* AnAxeToGrind: Wields a large axe made of Argent energy, which has [[{{Sizeshifter}} the handle extend and the blade enlarge]] when he attacks.
* BarrierWarrior: They project a large energy tower shield to defend against all attacks (''even the BFG'') so they can close in on you.
* TheBeastmaster: Can summon an astral projection of a wolf to attack you.
* BishonenLine: Subverted since they were formerly [[HumanAliens Night Sentinels]], but compared to the other "Super Heavy" demons, Marauders are not as overly huge or monstrous, being the smallest and most humanoid of the group. However, they're generally considered the toughest Super Heavies in the game.
* BossInMooksClothing: Technically, not even the first Marauder fought at the end of ''ARC Complex'' is a boss, given his lack of overhead health bar. Nonetheless, these guys are the absolute bane of players on ''any'' difficulty level, so much so that they ''transcend'' EliteMooks, with a single Marauder being enough to make your blood boil, even on ''I'm Too Young To Die''. The game will teach you to hate them with a passion.
* BottomlessMagazines: Although they have to quickly reload after every shot, player-controlled Marauders in Battlemode never run out of ammo for their Super Shotguns.
* ChessMotifs: WordOfGod describes the Marauder as the equivalent to the Queen on the chessboard, being the one piece with unparalleled mobility and game-ending potential that requires an extraordinary amount of your attention on the battlefield, and who creates an absolute ''ton'' of openings for the other, less maneuverable pieces while you are distracted trying to deal with it.
* CounterAttack: The most reliable way to damage them is to bait out their melee attack (in which their eyes conveniently flash green for a brief moment) and retaliate with either the Super Shotgun or the Ballista, which will briefly stun them. If you follow this up with a direct shot from the BFG, they'll go down instantly.
* CycleOfHurting: A skilled player can keep them perpetually stunlocked by swapping between the Ballista and Super Shotgun after each shot while spamming grenades.
* DefiantToTheEnd: One Glory Kill has the Marauder PunchCatch the Doom Slayer’s fist instead of just letting himself get killed. Unfortunately, it’s the arm that also has the Doomblade on it so he ends up stabbed through the face for his trouble instead. They are also one of the few types of demons who don't scream in pain or fear during any glory kill, at best glaring when the Doom Slayer is about to take their head off with their own axe.
* EvilCounterpart: Serves as a corrupted version of the Doom Slayer, with a similar build, similar armour, and equivalents of some of the marine's weapons, as well as moving just as fast as him.
* EvilSoundsDeep: The first Marauder encountered speaks with a deep, reverberating voice befitting his alignment and demonic corruption.
* FakeUltimateHero: {{Invoked}} by the first Marauder fought against the Slayer, calling him nothing but "a usurper" and "false idol".
* FallenHero: They are former Night Sentinels who fell to demonic corruption.
* FlashStep: Not unlike Doom Slayer's own [[VideoGameDashing dash ability]], Marauders will frequently dodge in bright red flashes of Argent energy, either to make space or close the distance when making a bold strike with their axe.
* {{Foil}}: To the Doom Slayer. He has a similar kit, but unlike the Slayer, who is all about offence, the Marauder is described as a "defensive powerhouse." He wields an invulnerable Argent shield that allows him to NoSell most forms of damage, and his preferred strategy is to take advantage of this to get in close so he can chop the Slayer up, tanking any return fire instead of avoiding it.
* GlowingEyesOfDoom: Their eyes briefly flash green when they're about to swing their axe. This is also the one time that they're open to a direct counterattack, and a quickly timed shot from a weapon like the Ballista or the Super Shotgun will briefly stagger them.
* HoistByHisOwnPetard: One of the Glory Kills the Doom Slayer can inflict on the Marauder is to break his leg, then snatch his battle axe and [[OffWithHisHead behead him]] with it as he doubles over in pain.
* KungFuProofMook: They are notably resistant to many of your equipment and superweapons. The chainsaw doesn't do anything to Marauders regardless of fuel capacity, and trying to OneHitKill them using the [[{{BFS}} Crucible]] is so difficult to set up that you are much better just fighting them conventionally. Additionally, shots from the BFG-9000 will bounce right off their shield and not deal any damage, and they can't be slowed down using Ice Bombs. However, the Flame Belch still works on them if you can time it right, and a BFG blast will still one-shot them if they've been staggered with another weapon first.
* LaserBlade: Uses a double-sided axe whose blades are made out of pure Argent energy.
* LightningBruiser: ''Sweet Jesus''. They have a metric ton of health, can block attacks and reflect projectiles with their shields, move and jump around just as fast as the Slayer and can do quick dashes that allow them to very easily close the distance and maneuver to your flank/rear. When it comes to their offensive arsenal, they can launch an [[SwordBeam axe beam]] from range, blast you with their Super Shotgun when you're up close, rush you while swinging their axe, and summon fiery wolf apparitions to attack you. In multiplayer, they can even repeatedly and rapidly throw exploding axes. In short, this is an enemy not to be taken lightly ''at all''.
* LogicalWeakness: Their shield may be impervious to all direct fire, but a savvy Slayer can exploit the blast radius of his explosives to damage them from the side/rear without needing to bait out their melee attack.
* LuckilyMyShieldWillProtectMe: Luckily for them, unluckily for you because the shield they carry can block a direct hit from every single weapon in the game, even the BFG and Crucible.
* PlayerExclusiveMechanic: To make up for the removal of some abilities noted under SecretAIMoves, Marauder players in Battlemode can [[ThrowingYourSwordAlwaysWorks throw their axes]] and DoubleJump instead.
* PretenderDiss: The first Marauder the Slayer encounters insults him, saying that he was not a true Sentinel and just an outsider that was let in, a "usurper".
* PunchCatch: One of the Glory Kill animations is them catching Doom Slayer's fist going for their head. Unfortunately for him, the Slayer just extends his Doomblade to impale the Marauder through the eye instead.
* RetractableWeapon: When they attack, the handle of their Argent axe extends, with the blade enlarging.
* SecretAIMoves: Unlike their campaign counterparts, player-controlled Marauders cannot activate a shield, nor can they swing their axe or fire beams from it.
* ShotgunsAreJustBetter: Uses a super shotgun like the Doom Slayer, though it doesn't have a Meathook of its own.
* SwordAndGun: Wields an axe and a shotgun at the same time.
* SwordBeam: Their long-ranged attack is to launch red energy slashes with their battle-axe.
* TacticalSuicideBoss: The Marauder is ''only'' open to a direct counterattack when he swings his axe. If he just stuck to tossing axe beams, firing his shotgun, and summoning wolves, he'd be almost completely immune to direct fire. Downplayed because he's still susceptible to splash damage from explosives.
* ThrowingYourSwordAlwaysWorks: In Battlemode, their primary mid-range attack is tossing their axe, which will either instantly explode upon hitting the Slayer or function like a timed sticky mine if it lands on any part of the environment. They'll use HammerSpace to quickly pull out another one.
[[/folder]]

[[folder:Tyrant]]
!!!Tyrant
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/tyrant_7.png]]

Heavily inspired by the Cyberdemon of the original game, Tyrants are one of the largest standard enemies fielded by the forces of Hell.
----
* AchillesHeel: The Tyrant is absolutely ''enormous,'' and it has a devastating ranged attack that lets it section off entire portions of the battlefield as inaccessible. However, it's very slow to turn around, and as mentioned before, its' massive size leaves it pretty much impossible to miss; the best way to take one out is to get in close and dance around it while you hammer it with everything you've got (As noted under ContinuityNod, this is how you dealt with them way back in the classic ''Doom'' games).
* ArmCannon: Its prosthetic left arm holds a quadruple-barreled rocket launcher that doubles as a laser cannon.
* BadBoss: The Tyrants served as wardens and slavers of the infernal pits, tasked with overseeing and collecting sin-branded human souls, and they also ruled over lesser demons, who feared the Tyrants for their cruelty and malice. They're also prone to attacking any other demons in their vicinity when The Slayer isn't present.
* BrutishBulls: Their large horns, one remaining hoof and some of their facial features give off this vibe.
* BossInMooksClothing: When a Tyrant shows up, expect to devote a good portion of your attention to if you plan to continue staying alive. Not that that's difficult; it ''dwarfs'' every other demon on the field easily, and is a terrifying sight.
* BodyHorror: Whatever led up to their cybernetic augmentation can't be pretty, judging by the exposed ribs and scarred flesh that can be seen.
* ContinuityNod: The codex lists the Tyrant's weakness as being their slow turn speed. In other words, they are weak against circle-strafing. That is exactly how you deal with cyberdemons back in the original ''VideoGame/{{Doom}}''.
* {{Cyborg}}: A mixture of demonic flesh and robotic augmentations.
* DeathFromAbove: Can rain down rockets from the sky. This attack involves few rockets and covers less of any particular arena than the 2016 Cyberdemon's did.
* DecompositeCharacter: They're essentially the original mid-boss Cyberdemon, due to the 2016 incarnation being established as a wholly unique entity.
* DegradedBoss: Effectively acts as a standard enemy variant of ''2016'''s Cyberdemon, since they retain much of his moveset, save the rock wall, dashing ability, and two health bars.
* HornsOfVillainy: Sport an appropriately impressive pair, particularly for their massive size, stretching to about their shoulders.
* LargeAndInCharge: Of all the recurring enemies, the Tyrant is easily the tallest (almost twice as tall as a [[GiantMook Mancubus]]) and it rules over lesser demons through fear.
* MacrossMissileMassacre: Like its original incarnation, its primary attack is rapidly firing rockets.
* MoreDakka: Outside of their slow turning speed and large size, Tyrants have no directly-exploitable weak points or weaknesses to a specific weapon; a loading screen tip will helpfully tell you that [[MythologyGag to defeat a Tyrant]], [[CaptainObvious shoot it until it dies]].
* MeatSackRobot: Unlike the majority of the other demons who show visible bones, muscle, and organs, blasting flesh off of Tyrants reveals mechanical features beneath their skin.
* MightyGlacier: It's extremely slow even for a Super Heavy demon and its huge size makes it an easy target, but it also has an incredible amount of health and the firepower to match.
* SuspiciouslySimilarSubstitute: Serves as this to the Cyberdemon, only having a different name due to "Cyberdemon" referring to the one specific demon in ''2016''.
* SwordBeam: As a close to mid-range attack, they can summon a fire sword and fire flaming slashes.
* TruerToTheText: Unlike the ''2016'' version, the Tyrant is more or less a modern recreation of the classic Cyberdemon, down to the boatloads of cybernetics (right leg, left arm, abdomen), facial appearance (long curving black horns, beady eyes set apart, razor-sharp teeth, lack of a nose) and colour palette, though it [[CompositeCharacter retains]] the ''2016'' Cyberdemon's ArmCannon design and a good portion of its attacks. Reflecting the classic Cyberdemon's degradation from Episode 2s final boss to a rare MiniBoss in Doom 2, Tyrants are presented as EliteMooks or mini-bosses instead of the full-on Boss encounter that the ''2016'' Cyberdemon was.
* WaveMotionGun: Like the Cyberdemon in ''2016'', the Tyrant can use a large laser from his arm cannon. It has a warning beam and takes a bit to wind up, but it deals high damage and the Tyrant will attempt to lead the beam on a mobile Slayer.
** There's a bug in the game, where, if you freeze a Tyrant with an ice bomb while he is firing the laser, then once unfreezes, [[ThisIsGonnaSuck he will fire the beam indefinitely]].
[[/folder]]

[[folder:The Hell Priests]]
!!!The Hell Priests
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/hell_priests.png]]
!!!'''Voiced by:''' Creator/KeithSilverstein (Deag Grav, Deag Nilox), Creator/JasonSpisak (Deag Ranak)

->"The sacrament of this world to the great Khan Maykr will be made, and the energy will be restored once again..."
->"...as it is written, from the souls of the non-believers!"
->"You will not save them from their judgement!"
-->--'''Deag Ranak and Grav'''
\\
Mentioned in ''Doom (2016)'', the Hell Priests were once the priesthood of the Night Sentinels, but were seduced by the power of Hell and subsequently played a pivotal role in the fall of Argent D'Nur. They now guide the demonic consumption of Earth. Three Hell Priests are known to exist: Deag Nilox, Deag Ranak, and Deag Grav.
----
* AgeWithoutYouth: [[spoiler:The Slayer's flashbacks to 150 years prior show that the Priests once looked like completely human middle-aged men, but have since withered away.]]
* AintTooProudToBeg: When Deag Ranak gets cornered by the Doom Slayer after he defeats the Doom Hunters, he desperately tries to offer him assistance or power in exchange for being spared. [[OffwithHisHead This ultimately falls on deaf ears.]]
* AssholeVictim: Absolutely none of them get the slightest bit of pity when the Slayer kills them systematically. [[spoiler:Especially in the codex when you learn they did it all in selling out their people out of [[TheQuisling fanatic devotion to the Khan Maykr]], [[AddictiveMagic to fuel their addiction to Argent energy and it's power]], [[ForTheEvulz and sheer amusement]] regardless of the destruction they cause of countless worlds in the process, including Earth.]]
* CoolCrown: They each have stylish spiked crowns of various styles, from a more standard design to a circlet covered by a hood to a full stylized helmet and faceplate, on their heads.
* CutsceneBoss: Technically speaking, [[spoiler:the Slayer kills all of them almost as soon as he sees them in cutscenes, save for the final one, whom manages to summon a guardian to protect him but once that's down soon meets the fate at the rest, [[KilledMidSentence all while mid-sentence of a monologue]].]]
* DiesWideOpen: Nilox and Ranak's heads have their eyes open after their deaths. [[spoiler:[[YourHeadASplode There isn't enough of Grav's head left for him to do this]]]].
* TheDragon: They are subordinates of Khan Maykr, who ordered them to destroy Earth.
* EvilGloating: They really love doing this. ''Deconstructed'' in that their words ultimately fall on deaf ears as the Slayer doesn't particularly care about what they have to say and kills them mid-sentence.
* EvilMakeover: Flashbacks and their individual codex pages show them as they were before being corrupted by Hell, with cleaner robes, straighter postures, and overall much healthier complexions. They also gained an [[VoiceOfTheLegion inhuman reverb to their voices]] over the process.
* EvilOldFolks: They are very old and wrinkly (unlike the [[OlderThanTheyLook Slayer]] they look the part) and they are ''very'' evil.
* GladiatorGames: The Arena on Sentinel Prime was originally meant to be a proving ground for outsiders and prisoners to join the ranks of the Sentinels and was how Doomguy first joined them. Since Argent's fall, it's been turned into a place of horrific bloodsport by Deag Grav, who pits armed civilians against demons for his own amusement.
* KarmaHoudiniWarranty: Deag Grav was first mentioned in ''Doom (2016)'''s codex as the one who swayed the Betrayer into the DealWithTheDevil that lead to the destitution of Argent D'Nur, while Deag Ranak is revealed to be the one who convinced Olivia Pierce to unleash Hell on Mars in exchange for godlike power, avoiding consequences due to never appearing in-game. Upon confronting the Doom Slayer in ''Eternal'' that luck abruptly runs out.
* KilledMidSentence: [[spoiler:All three of them. They either boast about how they're supposedly indestructible or try to bargain with the Doom Slayer. It doesn't work.]]
-->'''Deag Nilox:''' [[spoiler:My soul remains guarded... You can't--! ''(head ripped off by the Slayer)'']]\\
'''Deag Ranak:''' [[spoiler:...th...the...the... Beast... does he... hehe... not seek enhanced power? Gifts to aid him in his... noble conquest... perhaps in return for my-- ''(decapitated by the Slayer's Doomblade)'']]\\
'''Deag Grav:''' [[spoiler:This stops nothing. Earth will be consumed, regardless of what ha-- ''(the Slayer blows his head apart with the Super Shotgun)'']]
* LivingMacGuffin: Killing each of them is the key to halting the demonic corruption of Earth that is driving the plot of ''Eternal''.
* [[TheManBehindTheMan Men Behind the Man]]: Deag Ranak's work with Olivia Pierce and his manipulations after her death were responsible for the UAC becoming a demon cult, while Deag Grav was the one who is mentioned above to have not only swayed Valen into the DealWithTheDevil that doomed Argent D'Nur, but was the one who brought his son back as the Icon of Sin.
* MadScientist: Deag Ranak dabbles in cybernetics. He has notably designed the Doom Hunters, calling them his greatest work, and indeed these prove to be among the tougher enemies the Slayer can face.
* TheMole: When the Argent civil war began, the Sentinel Priests professed loyalty to King Novik against the Khan Maykr. Too bad they were actually setting the Night Sentinels up for the UriahGambit below.
* NotHyperbole: The first you hear from Deag Ranak and Grav in the game is "The sacrament of this world to the great Khan Maykr will be made, and the energy will be restored once again..." "...as it is written, from the souls of the non-believers!", and it's safe to say [[spoiler:they weren't kidding. Argent Energy is [[PoweredByAForsakenChild made from the souls of dead people]], tormented past the DespairEventHorizon]].
* OffWithHisHead: Deag Nilox gets his head ripped off, Deag Ranak gets his head sliced off with the Doomblade, and [[spoiler:Deag Grav [[ChunkySalsaRule gets his head blown off]] with the Super Shotgun]].
* OhCrap: Nilox lose his composure when the Slayer shows him a token that nullifies the protection the priest has on his soul. The two remaining priests share the same reaction when the Slayer tosses Nilox's head at them.
* TheQuisling: While the Khan Maykr is the ultimate leader of what remains of the Sentinel Worlds, the Hell Priests seem to do most of the actual ruling. Deag Grav, in particular, is described as lording over the populace of Sentinel Prime, while Deag Ranak was placed in direct charge of the UAC after Olivia Pierce's death, directing cultist efforts to aid the forces of Hell.
* SmugSnake: Deag Grav more than the rest of them, especially [[spoiler:after the boss battle on Sentinel Prime, [[TooDumbToLive where he has the gall to try and boast]] to the Slayer immediately after he slays his guardian about his blood pact that, if broken, will have all of Urdak and the Sentinels try to kill him. [[YourHeadAsplode The Slayer blows off his head anyway before he can finish boasting]].]]
* SquishyWizard: They are immensely powerful summoners, responsible for orchestrating not only the fall of Argent D'Nur, but are leading the invasion of Earth [[spoiler:at the behest of the [[ManBehindTheMan Khan Maykr]]]], but once the Slayer reaches any of them, he effortlessly kills them before they can either cast something noteworthy or begin monologuing his ears off.
* TheUriahGambit: The Hell Priests betrayed the Night Sentinels by sending them on a mission against Nekravol, only to use their magic to separate them and cut them off from escape, leaving them divided and vulnerable to the ravening demons that killed all of them except the Slayer himself.
* WasOnceAMan: They were once high priests of Argent D'Nur, before abandoning any semblance of their humanity to become undying demonic monsters with great power.
* WeHardlyKnewYe: Within the first few minutes of the game, Deag Nilox ends up choked by the Doom Slayer so hard his head snaps off his body. His total screentime amounts to ''[[ExaggeratedTrope 16 seconds.]]''
* YourHeadASplode: How [[spoiler:Grav]] goes out, courtesy of [[spoiler:the Slayer's Super Shotgun]].
* YouWouldntShootMe: [[spoiler:Even as he was staring down the barrels of the Slayer's Super Shotgun, Deag Grav was confident he wouldn't dare pull the trigger and risk losing his sovereignty among the remaining Sentinels. [[BoomHeadshot He was wrong.]]]]
[[/folder]]

!The Maykrs
[[folder:In General]]
!!The Maykrs
An ancient race of angelic beings that is lead by the Khan Maykr, whose alignment with Hell has brought an end to Argent D'Nur. They are the main antagonistic force, alongside with Hell, In ''Doom Eternal''.
----
* AngelicAbomination: The Doom Slayer can come across a giant, unarmoured body of a Maykr while escaping Urdak, which shows that the "angels" are not any different in appearances to the demons, their antithesis. [[spoiler:The Khan Maykr's true appearance just further cements that fact, if it is not already corrupted by the Icon of Sin like her brethren.]]
* {{Cyborg}}: The drones are the most obvious, but the Maykrs have used cybernetic enhancements as well as Argent Energy to improve their bodies.
* DealWithTheDevil: An apparently species-wide one orchestrated by the latest Khan Maykr. [[spoiler:So long as the Maykr and [[UnwittingPawn the Night Sentinels]] continue to provide new worlds for them to [[ViciousCycle systematically devour and absorb the souls of every so often]], the demons will allow them access to Hell energy to merge with their Sentinel energy to create Argent energy for a variety of purposes. Samuel Hayden outright calls it an "unholy union."]]
* DyingRace: Their creator has been missing for an untold length of time, and things have gone FromBadToWorse since as their numbers have dwindled and their leader has gone insane and can't be replaced via their usual means anymore. Only a constant stream of Argent Energy siphoned off from the demons' slaughter of other worlds keeps their world alive. [[spoiler:The Doom Slayer slaughters most of the remaining Maykrs and seemingly brings final destruction on their world. Some dialogue suggests that he may have inadvertently returned their missing creator in the process, so maybe they have a future after all.]]
* HaveYouSeenMyGod: Their creator, known only as "The Father", has been missing for quite some time.
* HiveMind: Nearly all of the Maykr are incapable of acting against the will of their Khan Maykr, with the rare exception in the case of [[DefectorFromDecadence the Seraphim]].
* {{Irony}}: ''DOOM Eternal''[='s=] codex implies that the Abrahamic religions are among the faiths inspired by the Maykrs in the distant past. However, it turns out that the Maykrs themselves are deliberately letting entire worlds fall to Hell so they can use the resultant Argent Energy to avoid undergoing the Transfiguration.
* LightIsNotGood: They have red- and gold-plated, silvery-white themes to their architecture and bodies, and only care for their own realm's prosperity and the "believers" who are sent to Urdak.
* MeaningfulName: "Maykr" is pronounced the same as "Maker," and they are vaguely godlike beings worshipped by the Argenta.
* MyBrainIsBig: Their brains are visible through a gold-tinted glass dome on their heads.
* NoBiologicalSex: There doesn't seem to be any features that distinguish male from female Maykrs, aside from the Khan Maykr, who appears to have something resembling breasts and a feminine voice.
* PowerFloats: Maykrs don't possess feet, with the lower half of their bodies being dominated by mostly tendrils. As such, their preferred mode of locomotion is to float around.
* ResurrectiveImmortality: They have a type of this. The Maykrs of old were incredibly long-lived, but they would eventually undergo a form of physical and mental degradation. They got past this with a process known as "Transfiguration", where they will willingly die and then be resurrected anew, being no worse for wear. However, [[HaveYouSeenMyGod after the Father went missing]], the Maykrs were left unable to perform the Transfiguration, which eventually led to the Khan Maykr making the deal with Hell for Argent Energy, which stalls their degradation indefinitely instead.
[[/folder]]

[[folder:Maykr Drone]]
!!Maykr Drone
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/maykr_drone.png]]

A new enemy in ''DOOM Eternal'', the Maykr Drones are the servants of the Khan Maykr, existing as literal extensions of her will, and are the main population of Urdak, the Maykr homeworld.
----
* BoomHeadshot: The recommended method to take these automatons out; a headshot from almost any weapon will instantly kill them, bypassing their high health pool and rewarding the player with a shower of pickups.
* CombatTentacles: For their melee attack, they sprout two golden energy tentacles from the sockets on their shoulders to whip at you.
* EliteMook: The boss fight with Khan Maykr has her accompanied by Drones coloured red instead of silvery-white, and they have a bit more health than the normal variant (though they still get instantly killed via headshots).
* HeavilyArmoredMook: The Maykr Drones are classified as "fodder" demons (alongside imps and zombies), but unlike other demons of the same class, their bodies are heavily armoured, making body shots do much less damage. Tellingly, they're also the only fodder type enemy that requires a fully fueled chainsaw to cut down.
* PinataEnemy: Scoring a headshot will make them drop a payload of health and ammunition (as well as armour if they happen to be set on fire at the time). Bonus points for the various dropped pickups being ColorCodedForYourConvenience, so that they even look rather like a spray of technicolour confetti/candy.
* UniqueEnemy: Excluding their appearance in the Mars Core Slayer's Gate, Maykr Drones are only encountered in Urdak.
[[/folder]]

[[folder:Maykr Angel]]
!!Maykr Angel
!!!'''Voiced by:''' Matthew Watterson
[[quoteright:349:https://static.tvtropes.org/pmwiki/pub/images/maykr_deacon.png]]
->''"Welcome home, Great Slayer."''

Revered figures who serve as speakers for the Khan Maykr, they are generally assigned as overseers and advisors amongst Maykr-controlled worlds.
----
* AffablyEvil: We don't see them do much aside following the Khan Maykr's schemes and being courteous to the Slayer.
* CyberCyclops: Their cybernetic armour makes them look like they have a single glowing eye in the middle of their face.
* EvilChancellor: Serve as advisors on Maykr controlled worlds, pushing the rulers there to spread their empire and find more worlds to have Hell destroy.
* HolyHalo: Has a technological variant (referred to as an "Orator Ring") attached to the back of their armour, which serves as a status symbol.
* MouthOfSauron: Their function in the Maykr Singularity is to relay the Khan's orders to the non-Maykr followers or allies. They even resemble the TropeNamer.
* StaffOfAuthority: Higher ranked Maykrs who carry golden staffs, unlike the lower-ranked Maykr Drones.
* TheUnfought: Despite being among the highest-ranking Maykrs outside of the Khan Maykr herself, you don't actually fight them in the campaign.
[[/folder]]

[[folder:Hooded Figure]]
!!The Hooded Figure ([[spoiler:Samur Maykr]])
!!!'''Voiced by:''' Creator/DarinDePaul
[[quoteright:137:https://static.tvtropes.org/pmwiki/pub/images/samur.png]]
[[caption-width-right:137:''"And now they will fear you."'']]

->''"We must move quickly. There are those who would seek to stop this."''
\\
A mysterious cloaked individual, the Hooded Figure was "the Seraphim" who empowered the Doom Slayer with great strength and speed to aid in the Slayer's battle with the forces of Hell, seemingly against the wishes of the Khan Maykr.
----
* TheChessmaster: His stealing of the Father led to the Khan Maykr [[spoiler:making a deal with Hell and made Argent Energy prosperous throughout both their realms]]. He also manipulated the Doom Slayer ever since the Unholy Wars, ensuring that the Maykrs would become the Doom Slayer's enemy due to allying with the Demons and the Slayer would have the strength to defeat them through the Divinity machine he used on him. [[spoiler:And if true that he and Samuel Hayden are one in the same, then he also manipulated the Doom Slayer to defeat Olivia Pierce's cult and the Demons on Mars, and to retrieve for him the demonic Crucible from Hell, allowing him to continue his Argent research and production and his plans to develop synthetic Argent Energy. All of which during an [[PostPeakOil energy crisis on Earth]] that caused him to be looked by humanity as a legendary saviour with his technology]]. What he ultimately is scheming towards is unknown, only that he seems to want the Demons and Maykrs out of his way.
* DefectorFromDecadence: Judging from how he acts against the will of the Khan Maykr (which would appear to be impossible for most Maykr), the figure appears to be this.
* TheExile: Vanished mysteriously after his service to the Doom Slayer, generally believed to have been exiled from Urdak by the Khan Maykr for his renegacy.
* InTheHood: He has a red hood that conceals his entire body.
* NiceJobBreakingItHero: While it is clear he's a bit nicer than the other Maykrs, he becomes a bit more ambiguous in motivation when he stole the Father from the Maykrs, prevented them resurrecting themselves after their physical and mental degradation, and preventing a new Khan being created to replace the current one. This ultimately leads to [[spoiler:the Khan Maykr making a deal with Hell, sacrificing all the worlds under Urdak's guidance to the Demons so that the souls may be turned into Argent Energy keep the Maykrs alive and prosperous, becoming one of the Doom Slayer's main enemies]].
* RogueDrone: The Maykrs are stated to possess a collective consciousness but he is able to act against the rest of his kind for currently unknown reasons.
* TokenHeroicOrc: Somewhat. The Hooded Figure [[spoiler:is the Seraphim mentioned in the previous game]] is clearly a Maykr given the cybernetics and tendrils visible beneath his robe. Yet, he aided the Doom Slayer into becoming what he is now, seemingly in spite of not only Hell [[spoiler:but eventually the Khan Maykr's plans themselves given the context of his words and his haste, [[SpannerInTheWorks implying it wasn't part of her plan to empower the Doomguy to begin with]].]] But his ultimate agenda and loyalties are left ultimately ambiguous.
* WhatHappenedToTheMouse: Whatever happened to him between him infusing the Slayer with superhuman powers is never really explained in detail. [[spoiler:Although if you buy the theory of him being Samuel Hayden, things do clear up a little.]]
[[/folder]]

!Bosses
!!Introduced in ''Doom (2016)''
[[folder:Cyberdemon]]
!!!Cyberdemon
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/img_0161_0.PNG]]

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.
----
* BackFromTheDead: ''Thrice''. This guy was a pile of bones before a bunch of scientists got their hands on him, the first clone of him they made escaped so they had to make another one, 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 [[UnstoppableRage 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.
* DishingOutDirt: When resurrected in Hell, it gains the ability to create rock walls to trap the player and heavily restrict movement.
* {{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-HiveMind under the direction of a "mastermind".
* ForScience: What amounts to the thought process behind the TooDumbToLive scientists at UAC in making the Cyberdemon in the first place. Then doing it again.
* GoneHorriblyRight: 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. And they did this ''[[TooDumbToLive twice]]''. It took a HeroicSacrifice 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.
* ItsPersonal: 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.
* KillItWithFire: It will randomly throw blades of fire at you, and if you get too close he'll try to crush you with a quick, fiery stomp wave.
* LightningBruiser: This iteration of the Cyberdemon is ''very'' fast, and the codex entries outright boast of its ability to take extreme amounts of punishment.
* LivingMacGuffin: The Doom Slayer needs the Argent Accumulator powering the Cyberdemon in order to send himself to Hell, while Dr. Peters needs the Accumulator in its prototype clone to close the Hell Portal on Mars.
* LaserBlade: If one looks carefully enough as it performs its SwordBeam attack, it appears to conjure first a larger energy sword based off of the bony spike on its arm before tossing the projectiles.
* MacrossMissileMassacre: 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.
* MythologyGag: 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.
* NitroBoost: He uses these in-built jets to make himself harder to hit during the boss fight.
* OffWithHisHead:
** 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, [[MadeOfPlasticine with enough force to annihilate everything above the monster's lower jaw.]]
* RoaringRampageOfRevenge: 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 [[UnstoppableRage doesn't take it well.]]
* SwordBeam: 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.
* TooDumbToLive: Not the Cyberdemon itself, which is pretty competent, but rather the scientists who brought it BackFromTheDead thought that turning it into an "ultimate battle demon" was a ''good idea''. The creature was hostile from the outset, with the first prototype of it managing to escape to Hell. When they made the second one 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. All after having seemingly learned nothing from their experience with the prototype to use to control the second version.
* TwinMaker: ''Doom: VFR'' reveals that another Cyberdemon was created as a prototype before the one Doom Slayer fights in-game, but that the UAC lost it and it ended up back in Hell. It looks and fights identically to the other one, though it has no second phase[[note]]So no sudden resurrection and no rock corridors[[/note]], and Dr. Peters has to go find and kill it in order to retrieve its Argent Accumulator to close the Mars portal.
* VillainousValor: Unlike the other demons, this one doesn't display any fear of the Doom Slayer, despite having been killed by him in the past. The first thing he does when he realizes the Doom Slayer was about to enter his chamber is to force the doors open and drag him in himself. After being seemingly killed in the boss fight the first time, he uses his sheer hate to draw on Argent Energy to [[TurnsRed bring himself back to life]].
* WaveMotionGun: 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.
* WeCanRebuildHim: When the UAC captured it, the demon was nothing but fossilized remains. It was cloned at least twice, revived with Argent Energy, and then was outfitted with cybernetic enhancements that made it incredibly hard to subdue or kill.
* YouWillNotEvadeMe: After returning from death in Hell, it can create rock corridors to heavily restrict the player's movement, specifically to enable the use of its SwordBeam attack.
[[/folder]]

[[folder:Hell Guard]]
!!!Hell Guard
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/img_0164.PNG]]

A trio of demonic suits of armor, each playing host to a diminutive, snakelike creature that controls it.
----
* AllThereInTheManual: The ''DOOM Eternal'' Collector Edition's Lore Book states that the parasite pilots are known in Hell as "Ebon Leeches", while the armor itself is seemingly referred to as a "Bone Strider".
* BarrierWarrior: 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.
* CanonForeigner: 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.
* ConservationOfNinjitsu: 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.
* DefiantToTheEnd: 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 armour. It takes several seconds to tug the PuppeteerParasite free. It's still [[{{Determinator}} doggedly]] biting down even as the Slayer tries to [[HalfTheManHeUsedToBe pull it in half]].
* DualBoss: The second and third Hell Guards attack you at the same time.
* {{Foreshadowing}}: Dead specimens of the parasite pilots can be spotted among the [[SuspiciousVideogameGenerosity vast pile of ammo and armour]] right before the Guard's BossBattle.
* KilledOffScreen: As mentioned in the entry above, a number of dead parasites, specifically seven, are scattered before the entrance to the BossBattle. It is unclear whether they were killed or just simply died, but if each of the corpses were meant to have been part of a full Hell Guard unit, then that means the Doom Slayer was meant to have fought '''ten''' of them for the Crucible instead of just the remaining three.
* PoweredArmor: All they are is basically magical and meaty suits of armour with a PuppeteerParasite inside both piloting it and acting as its battery.
[[/folder]]

[[folder:Spider Mastermind]]
!!!Spider Mastermind
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/img_0162_9.PNG]]
->''"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 keyholder, 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 Imperatrix. 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."''
\\
A vaguely spider-like cybernetic demon monstrosity referred to in Hell as the Aranea Imperatrix.
----
* BadassBoast: 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 come. A great blessing will be given to the keyholder, 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.
* BeamSpam: It makes use of a ''plasma [[GatlingGood chaingun]]'' and multiple laser blasters to roast and toast anything in her way.
* BeCarefulWhatYouWishFor: The result of such a wish. [[spoiler: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.
* ClippedWingAngel: Unlike any other boss fight in the game, or even the ''series'', this Spider Mastermind gradually gets weaker and weaker with the more health she loses, indicating that actually fighting the Doom Slayer was the worst possibility for her. By the time the finisher comes, she can't even fight back anymore. The fact that she was made out of an EvilCripple [[FridgeLogic may be a factor as to why this is.]]
* DamageSponge: 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.
* FinalBoss: She's the final boss the Slayer must face at the end of the game.
* FreezeFrameBonus: She can be spotted briefly in a vision the Doom Marine gets when first reaching the Lazarus Labs (replacing the loading screen), [[spoiler:hinting at her connection with Olivia Pierce]].
* GiantSpaceFleaFromNowhere: Her inclusion in the game is obliquely hinted at in exactly one lore entry, with no other mention until you fight her. [[spoiler:After dropping down into the boss arena, Olivia Pierce is shocked, and transforms into the Spider Mastermind. Then the battle starts.]]
* LightningBruiser: It is the most durable enemy in ''2016'', can dish out a beating with all of its attacks, and is deceptively fast despite its size.
* IronicDeath: She's eventually killed with the BFG... which [[HoistByHerOwnPetard she helped design]].
* MindOverMatter: One of her powers is telekinesis, which she uses to throw bits of the arena at you.
* MorphicResonance: [[spoiler:The Mastermind, like Olivia, needs a bone-coloured mechanical exosuit hooked to her brain to move properly.]]
* MythologyGag:
** 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. [[FromBadToWorse 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.
* PersonalityPowers: [[spoiler:Olivia was a very stubborn person with a high tolerance for pain who valued her mind and manipulated all those beneath her to achieve her goals. As the Mastermind, she gains telekinetic powers, inhuman durability and becomes the host of a massive hivemind of demons.]]
* PsychoElectro: One of her attacks lets her create a burst of electricity in an aura around herself.
* SamusIsAGirl: [[spoiler: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.
* ShockAndAwe: The second half of her boss battle has her electrifying the floor, requiring the Doom Slayer to jump on top of pillars to avoid damage. Her final phase has her manipulating electricity to throw the same pillars at the Doom Slayer.
* ShowsDamage: 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.
* SpiderTank: Her lower half is a cybernetic, four-legged chassis meant to support her quite large head. She can also flip herself upside down with no problem.
* TurnsRed: 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.
* VillainousBreakdown: 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, [[FaceDeathWithDignity she's pretty much given up and resigns herself to her imminent death.]]
* VillainousValor: She is one of the very few demons who displays no signs of fear toward the Doom Slayer even once defeated. In fact, the first thing she does upon surfacing is roaring at the Slayer before immediately readying the guns.
* WasOnceAMan: [[spoiler:This demonic monstrosity is none other than Olivia Pierce herself, having been "[[BeCarefulWhatYouWishFor rewarded]]" by her demonic superiors.]] Subverted by the ''DOOM Eternal'' Collector Edition's Lore Book, which indicates that the Spider Mastermind is actually [[spoiler:a seperate and ''very'' ancient entity that merely used Olivia's sacrifice as a way to give herself physical form]].
* YourHeadAsplode: The result of being executed point-blank with a BFG blast through her mouth. Granted, [[{{Cephalothorax}} there's not much of her to 'asplode ''besides'' head]].
[[/folder]]

!!Introduced in ''DOOM Eternal''

[[folder:Doom Hunter]]
!!!Doom Hunter
!!!'''Voiced by:''' Creator/DaveBoat
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/doom_hunter.png]]
[[caption-width-right:350:''SLAYER IDENTIFIED'']]

->''"I thought you'd appreciate the sentry I chose. The great Agaddon Hunters from the Telos Realm, though long thought to be extinct, created to hunt only the Slayer and his Night Sentinels during the Unholy Crusade. Some improvements on the design have been made; enjoy what is undoubtedly my finest work."''
-->-- '''Deag Ranak'''
\\
Formerly Agaddon Hunters, an ancient beast-like race that was bred and modified by Hell specifically to hunt the Doom Slayer and the Night Sentinels. After they were supposedly driven extinct long ago, they have been revived as heavily armed cyborgs to continue their task.
----
* ArmCannon: Sports one that shoots fireballs.
* ArtifactTitle: Despite their name, the Doom Hunters [[NonIndicativeName don't so much "hunt" the Slayer]] as are plopped in his way to hinder him in his quest. Rather, their name is a holdover from back when their job ''was'' to actually hunt the Slayer, before he devastated their ranks to extinction.
* AttackItsWeakPoint: While breaking its plasma shield and smacking it around will force it to ditch its sled, the sled is not actually protected by the shield. Savvy players can aim directly for the sled and destroy it without having to go through the barrier.
* BackFromTheDead: The Aggadon Hunters were an ancient race of beast-like hunters that Hell used ''specifically'' to hunt the Doom Slayer only to get wiped out instead. However, they've been revived as the cybernetic and armed-to-the-teeth Doom Hunters.
* BarrierWarrior: It can generate a plasma shield around its organic body that needs to be taken down via Plasma Rifle before damage can be dealt with its body. It will regenerate if you don't destroy the Doom Hunter's sled fast enough.
* ChainsawGood: Its left arm has a set of two flaming chainsaws on it, which it uses to melee attack.
* ClippedWingAngel: Once you do enough damage to it, it's forced to abandon its sled, which disables its force field, missile, and machine-gun attacks.
* ContractualBossImmunity: The first three Doom Hunters you face have immunity to being frozen by Ice Bombs, with subsequent Doom Hunters losing that immunity.
* {{Cyborg}}: It's a mostly robotic demonic skeleton who still has part of its head, chest and right arm still made of flesh.
* DegradedBoss: Doom Hunters start showing up in later levels as standard enemies. While they're a bit easier to kill, they still hit just as hard as their boss versions. [[ContractualBossImmunity Though they lose the immunity to Ice bombs]].
* ExtraEyes: Although initial concept art had it be more of a CyberCyclops, the actual enemy has seven eyes; One giant one and then six smaller ones surrounding it.
* HoverTank: The lower half of its body is a giant armoured "sled" with various jets that allow it to float in the air, as well as packing mounted missile launchers and machine guns.
* LightningBruiser: The Doom Hunter is surprisingly mobile and can do a lot of damage at just about any range, thanks to the massive array of weapons it can choose from. It also has a large amount of health, which is bolstered further by the regenerating shield protecting its body.
* MacrossMissileMassacre: Can fire [[{{Roboteching}} lock-on rockets]] that home onto the Doom Slayer's position. This is its primary means of attack if it's far away from the Slayer.
* MoreDakka: Its sled has two machine guns mounted to it, which it will gladly use to turn you into Swiss cheese.
* ShedArmorGainSpeed: Enough damage to a Doom Hunter will cause it to abandon its sled, sacrificing firepower and defence for a massive increase in agility.
* SuperSoldier: Doom Hunters were a once-thought extinct species from Earth that were captured and genetically modified by Hell into mindless cyborgs to specifically combat and hunt the Doom Slayer and the Night Sentinels. They've only gotten stronger after Deag Ranak rebuilt them.
* MythologyGag: Their design is very similar to Sabaoth from ''VideoGame/Doom3''.
* {{Ultraterrestrials}}: The Aggaddon Hunters are native to ''Earth'' according to DNA analysis, with Carbon-dating on some preserved subjects measuring them as nearly ''eighty million'' years old and pre-dating all complex, carbon-based life on Earth. The Argenta discovered them sixty million years ago, and no fossils of the species have been found beyond the Arctic tundra.
* WeCanRebuildHim: Deag Ranak brought the species back and gave them the arsenal of a tank division as an upgrade.
* WolfpackBoss: In their boss encounter, you'll first be pitted against one Doom Hunter. Kill that one, and you'll have to fight two more simultaneously.
[[/folder]]

[[folder:The Gladiator]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/gladiator.png]]

A demonic executioner that serves as the grand champion of Hell's Colosseum. He is the guardian of Deag Grav on Sentinel Prime.
----
* AttackReflector: Once his shield is destroyed, he can spin his flail to reflect all projectiles.
* DualWielding: Upon the second phase of the boss battle, The Gladiator's shield is destroyed and he fills out his empty hand with another identical flail.
* EpicFlail: Uses a demonic faced spiked morning-star connected to it's handle with a chain of argent energy.
* EyepatchOfPower: Has a spiked metal eyepatch over his right eye.
* FaceDesignShield: His shield has a demonic, animate face on it with glowing eyes like his own.
* GiantSpaceFleaFromNowhere: The Gladiator is never mentioned beyond the very level where he is fought, and even then the level is short enough that it feels like he appears out of nowhere. He has no relevance to the plot beyond holding the PlotCoupon that allows Deag Grav's death to stick.
* HoistByHisOwnPetard:
** During the first phase of the fight, the shield will visibly blink well before the Gladiator strikes with its flail, blinking once or twice depending on whether it's a quick or heavy attack respectively. Given the circumstances behind what the shield is, this blinking may be an intentional act of defiance.
** The Doom Slayer finishes it off by crushing its skull with one of its own flails.
* LivingWeapon: The shield he carries is said to contain the tormented soul of his dead master.
* MonstrousMandibles: Has an extra pair of fanged mandibles on either side of his face that better illustrate his demonic nature.
* MythologyGag: Its design clearly evokes the classic Hell Nobles, most prominently through its fanged, goatlike facial structure, woolly legs and cloven hooves.
* NoSell: As a boss, he is immune to most of your equipment and superweapons. The Flame Belch doesn't generate armour when used on him, the Chainsaw doesn't register him as a valid target, and Freeze Grenades don't take effect. He also can't be instant-killed by the Crucible if the player tries to pull this on him when replaying the mission (it will still take out a massive chunk of his health), though the BFG and Unmaykr still work on him.
* PreMortemCatchphrase: After the Slayer stabs the shield in its eye and concluding the fight's first phase, it screams ''"KAR EN TUK"''[[note]]"RIP AND TEAR" in Argenta[[/note]] - the same war cry that which the Sentinels cheered the Slayer on with - before exploding. Given how the shield is described as containing the undying, tortured soul of the Gladiator's master, chances are it's cheering on the Doom Slayer to finish the Gladiator off; a show of thanks for freeing it from its torturous existence.
* SavageSpikedWeapons: Uses a spiked morning-star to better illustrate his character as a bestial demonic gladiator.
* ThrowingYourShieldAlwaysWorks: One of the Gladiator's Phase 1 attacks has him bash the side of his shield and slam it down, causing the shield to fire out a ghostly replica of itself at the Slayer.
* TurnsRed: After destroying his shield, he will whip out another flail and attacks much more aggressively.
* WhipItGood: He's prone to spinning and letting his flail fly far with wide sweeps.
* YourHeadAsplode: At the end of their battle, The Gladiator gets a particularly brutal bludgeoning by the hands of The Doom Slayer, which concludes with its head being crushed like a watermelon.
[[/folder]]

[[folder:Khan Maykr]]
!!Khan Maykr
!!!'''Voiced by:''' Creator/NikaFutterman
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/kahn_makyr.png]]

->''"For millennia we have survived. Made others sacrifice in the name of our prosperity - so that they may in turn find redemption. Who are you, a human, once a mortal, to defy our traditions?"''
\\
Known also as the "Supreme Maker", the Khan Maykr is the ruler of the Maykr's homeworld, Urdak. She is the main antagonist of ''DOOM Eternal'', and while that fact is clear from her first appearence, her nature and her past with the Doom Slayer are slowly revealed to the player as the game goes on.
----
* AngelicAbomination: She ''looks'' like a divine, heavenly being with her predominantly white colour palette and holy intentions, but from what we have seen of her, [[spoiler:and what she looks like underneath the armour (at least after the release of [[TheCorruption the Icon of Sin]])]], she is anything ''but'' truly angelic.
* BelievingTheirOwnLies: [[spoiler: It is revealed that the Maykrs are just an alien race that has a deal with Hell to give up planets for them to conquer and in turn get provided the energy it produces to save their dying world. Yet to her dying breath she seems to believe they are an angelic race and going against them is blasphemy.]]
* BigBad: The one who sent the demons to invade Earth, and the master of the three Hell Priests that are directing the demonic invasion. While the Icon Of Sin is the actual FinalBoss, he has basically no characterization and is just a monster, and was summoned by Khan Maykr to start with.
* BigNo: [[spoiler: When the Doom Slayer ruins the ritual and destroys the heart used to control the Icon of Sin.]]
--> '''Khan Maykr:''' [[spoiler: We will not be able to control it! NOOOOOOO!]]
* BrokenPedestal: For many of the Sentinels, the reveal of [[spoiler:the true nature of Argent Energy and the Khan Maykr's collusion with Hell]] was this in regards to the being the Sentinels had revered as the "Mother God" since their earliest days.
* CallingYourAttacks: Every time she uses her "rain of fire" attack, she says a word that [[{{Mondegreen}} sounds like "circle" or "servile" but is probably just gibberish.]]
* TheCorrupter: She is the one who orchestrated the fall of Argent D'Nur by corrupting the Order of The Deag into the Hell Priests.
* DealWithTheDevil: She made one in secret with the [[spoiler:[[{{Satan}} Dark Lord]], the ruler of Hell: The Maykrs will give Hell access to various worlds under their purview to systematically farm souls from to power Hell and the Demons as part of a ViciousCycle, as well as the technology to refine those souls with Hell and Sentinel energy to create Argent energy. In return, Hell does not invade Urdak, Hell only takes the souls of sinners to become Demons, while souls of the "true Believers" are sent to Urdak along with a majority of the Argent energy so the Maykrs may further prosper and find more worlds to sacrifice to Hell. Furthermore, unless dictated otherwise, Hell is only to farm the Souls of a majority of the species, not assimilate the whole world, in order to allow the species to survive and recover from the invasion, so that they may be farmed again later]].
* DidntThinkThisThrough: The only reason Urdak hasn't come under fire from demon invasion is twofold: one, it exists in opposite dimensional positioning to Hell, and secondly due to a protective seal over the entire realm. [[spoiler: The Khan Maykr singlehandedly ruins both of these protections: first by making Hell ''aware'' of Urdak in brokering a deal with its enigmatic dark lord, and secondly by having the [[SarcasmMode infinitely wise and intelligent idea]] of bringing the Icon of Sin ''to'' Urdak to awaken in an attempt to control, the one force of all demonkind powerful enough to render the seal inert by its mere presence there and allowing Hell to invade in earnest.]]
* DiscOneFinalBoss: Being the BigBad of ''Eternal'' doesn't spare her from being killed in the 11th hour of the story by The Doom Slayer's hands.
* EvilMatriarch: She rules the Maykr race with an iron fist.
* FallenAngel:
** It's safe to say she's not the PurityPersonified that she wants to give off. She might have started out that way, but the loss of The Father meant she had to resort to despicable means to continue on surviving.
** With every blood punch the Doom Slayer lays on her during her boss fight, she even starts to visually resemble one more and more. By the third, it even looks like her wings are on fire, and breaking as she plummets to the ground by the end.
* FantasticRacism: If her words to the Doom Slayer are of any indication, she ''really'' doesn't have a very good view on humanity. She thinks that mankind are mere servants to her beliefs, and wants to destroy them by means of directing a demon invasion of Earth, so that their souls can be used to save ''her'' world.
* {{Foil}}: Like Samuel Hayden, she's a bio-mechanical Supreme Leader who decided long ago that it would be a good idea to harness the power of Hell to bring prosperity to her planet. She's a great deal more arrogant about it than Hayden and was actually quite a lot more successful than he was at doing so, at least for a while.
* GodGuise: She appeared as a benevolent, godlike figure to the Argenta and countless other worlds, offering spiritual salvation to a heavenly plane -- [[spoiler:but underneath her armour, she's just another monstrous-looking alien. Not even the sufficiently advanced technology of the Maykrs is strictly hers; it was all granted to them by a higher power, the Father.]]
* GreaterScopeVillain: Of the rebooted series that is, being directly responsible for putting [[TheQuisling the Priests]] in their positions that led to the collapse of Argenta society by betraying the Night Sentinels, making a deal with Hell for their own survival that led to their conquest increasing in intensity with their full sanctioning, and especially responsible for the Doom Slayer's current predicament with rooting out mankind's demon problem that came as a result of all this.
* HiveQueen: Khan Maykrs are the leaders of the Maykr collective, and all other Maykrs ultimately bound to their will. However, individual Khans are ''supposed'' to be temporary, with new ones generating and replacing the old ones to keep the Maykrs from stagnating. The disappearance of the Father, the progenitor of the Maykrs, has caused the process to fail, and allowed this particular Khan Maykr to reign for much longer than normal and eventually leading her to make a deal with Hell.
* HoistByHerOwnPetard: Pushed to desperation as the Slayer begins to [[SpannerInTheWorks seriously jeopardize her plans]], [[spoiler:she is forced to bring [[SatanicArchetype the Icon of Sin]] back to life in an attempt to railroad everything back on track, but in so doing, she spells her own demise as it leads the Slayer directly to Urdak where he also derails the ritual meant to leash the Icon of Sin to their command, which allows the Icon to not only cause massive damage to Urdak, it ''breaks'' the ExactWords clause of their pact that the Maykrs made with Hell, allowing a full-scale demonic invasion to finally attack their world, which ultimately ends in the Khan Maykr's death and the destruction of the Maykr people.]]
* LargeAndInCharge: She's physically the largest Maykr seen in-game (second largest assuming the creature in the tank near the end of Urdak is also a Maykr), and wields absolute authority over her fellows.
* LaserGuidedKarma: It takes ''many'' ages for karma to finally come back around on the pendulum, but after [[spoiler:ending many worlds for the sake of her own power and rule to last, all because the Doomguy accidentally exposed the existence of Hell to her, and even having most of the Night Sentinels wiped out when they tried to resist her evil; that same marine turned into the Doom Slayer that she personally disliked for [[SpannerInTheWorks never quite falling into her plans]] finally undoes all of her work, kills her, and causes the destruction of her world.]]
* LastOfHerKind: Strongly implied, since Khan Maykrs are ''made'', not born. With Transfiguration rendered impossible by the disappearance of the Father, and compounded with the full-on invasion of Urdak by Hell, prospects are looking pretty grim for the rest of the Maykrs with her dead.
* LightIsNotGood: She tends to radiate a beautiful light and presents as a shining, angelic being. She's also a vicious tyrant willing to condemn countless worlds to death for her own selfishness.
* MoralMyopia: She has no problem [[spoiler: [[DealWithTheDevil being in cahoots with the demons]] and condemning countless innocent lives, to both prevent Urdak from being invaded and to profit from the power of Argent energy]]. But, when the Slayer makes moves to stop the demon invasion of Earth to save his people, which [[spoiler:ends up depriving both Hell and Urdak their source of Argent energy, thus culminating in the destruction of her world]], she [[YouMonster angrily brands him a selfish monster]] and condescendingly preaches that the death of his people is for "the greater good", [[TheRightOfASuperiorSpecies all while being willfully ignorant of her own seething]] FantasticRacism.
* NeverMyFault: She constantly blames the Doom Slayer for interfering with the sacred designs of Earth's destruction, always saying that he's doing nothing but making everything worse and only dooming humanity further while making false claims that humanity brought it upon themselves and not just the UAC ''her forces specifically corrupted to facilitate the invasion''. Not once does she consider the MoralMyopia involved with any of this, causing the extinction of uncounted worlds for her own selfish intent. It's not even BlueAndOrangeMorality, she's just that twisted.
-->'''Khan Maykr''': [[spoiler: You have destroyed all I was meant to rule!]]
* OhCrap: Her reaction when [[spoiler:the Doom Slayer interrupts the ritual to resurrect the Icon of Sin, making it act without her control]].
-->'''Khan Maykr:''' [[spoiler:We will not be able to control it! [[BigNo NO!]]]]
* PragmaticVillainy: Part of her deal [[spoiler:with Hell was that the invaded species not be completely wiped out, but only so they can eventually recover and be reused as fuel. But it becomes Double Subverted once the Doom Slayer kills the Hell Priests, and she's forced to releases the Icon of Sin to destroy the whole world. The loss of which, [[NeverMyFault she blames on the Doom Slayer]]]].
* TheRightOfASuperiorSpecies: Her biggest, main reason to justify this whole energy production, this systematic destruction and torment of worlds and their entire populations to submit them to supposed judgement and draining of their very souls? In the end, it amounts to "because it's for US".
* SatanicArchetype: Ruler of a race of [[LightIsNotGood decidedly misanthropic]] angelic figures who [[spoiler:usurped control after the original, good ruler of Urdak left for unknown reasons and has been corrupted into a demon.]]
* TurnsRed: [[spoiler:In her boss battle, as her holy visage begins falling apart and reveals her demonic appearance underneath, she increasingly ramps up the heat and employs more devastating area-of-denial attacks to corner the Slayer, up to igniting most of the arena in flames to limit his movement.]]
* TooDumbToLive: [[spoiler: Instead of awakening the Icon of Sin in a place where it can do the least damage, she instead brings the Titan to Urdak. As a result, she ends up indirectly responsible for breaking the protective seal keeping the demons from invading and by extension ends up damning herself and her people to a FateWorseThanDeath because she wouldn't awaken it somewhere less tactically compromising. Even Hayden notes that while the Doom Slayer destroyed her people by keeping her from controlling the Icon, it is her fault that they were in that position in the first place.]]
** Not only that, she even let [[OneManArmy the Slayer]], whose capacity for destruction was supposed to be known to her know that [[spoiler: she was going to wake the Icon of Sin!]] She really gave her all to earn this, didn't she?
* VillainousValor: [[spoiler:Even everything's falling apart in Urdak and the Doom Slayer is breathing down her neck, she voluntary makes a last stand against the Slayer from reaching Earth to stop the Icon of Sin anyway as part of an attempt of TakingYouWithMe for all mankind as a consequence of the Slayer's actions in the final act of the game.]]
* WhatTheHellHero: [[spoiler:In her death throes, she attempts to guilt the Slayer for causing the destruction of Urdak and potentially putting the whole of existence in jeopardy in his mad quest of revenge, maybe even dooming mankind anyway in the process, [[ShutUpHannibal but it falls on deaf ears as he simply carries on to stop the Icon of Sin]].]]
[[/folder]]

[[folder:The Icon of Sin]]
!!!'''Voiced by:''' Edward Bosco
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/icon_of_sin.png]]
[[caption-width-right:350:[[labelnote:Click here to see its armoured form]]https://static.tvtropes.org/pmwiki/pub/images/icon_of_sin_armored.png[[/labelnote]]]]

->''"For his payment, the Betrayer's son was returned to him in our form, and the Icon of Sin was brought upon the heathens. His vengeance was swift and merciless, for the wages of treachery are suffering."''
\\
A towering elder demon of pure destruction, extreme power and chaos -- whose corpse can be seen littering the bowels of Hell along with the other ancient demons in ''DOOM (2016)''. It is the final boss of ''DOOM Eternal''.
----
* ArmorAsHitPoints: Until you knock all of its armour plates off its body, you will not be able to do any damage to its fleshy bits.
* AttackOfThe50FootWhatever: A giant goat-headed demon the size of a skyscraper.
* BookEnds: In ''Doom II'', you kill this guy by shooting its brain. In ''Eternal'', after destroying its armour and then its body, you kill it once more by planting the Crucible right into its brain.
* TheBusCameBack: The FinalBoss of ''Doom II: Hell on Earth'' returns once again after being absent since ''Doom 64''.
* CallingYourAttacks: When unmasked, it can be seen speaking some type of demonic language to perform an EnemySummoner spell.
* CameBackWrong: The Betrayer stuck a deal with Hell to bring his dead son back to life, only for him to come back as an infernal, towering elder demon instead of a man because the demons see this as a fitting reward for a traitor like the Betrayer.
* DeathFromAbove: One of its attacks is raining down meteors from the sky.
* {{Determinator}}: Even the flesh is being blasted off its body, it will relentlessly fight back with no loss in vigour until its health is at zero.
* EasterEgg: While it doesn't appear as an enemy in ''2016'', you can find its skull in "The Necropolis". Shooting a rocket at the sigil on its head (the spot where its weak spot was in ''Doom II'') will have it recite the famous "!oremoR nhoJ ,em llik tsum uoy emag eht niw oT" quote from the classic ''Doom II'' boss battle and spit out a spawn cube that drops a Doom Slayer collectible doll.
* EldritchAbomination: A colossal demonic beast that distorts reality, is capable of tearing down spacetime, spreads madness to wherever it goes, and cannot be permanently killed.
* EvilCounterpart: To the Doom Slayer. It uses a giant suit of powered armour just like his and is easily the only thing that's remotely in his weight class. Both of them were once ordinary men changed by supernatural powers into unstoppable forces--the difference being that the Doom Slayer still has his humanity and sanity, while the Icon is a nearly mindless force of destruction.
* EvilIsNotAToy: [[spoiler: Bringing Icon of Sin into Urdak was not the wisest decision the Khan Maykr could have made, [[SpannerInTheWorks in part thanks to the Doom Slayer interfering with the ritual meant to control it]].]]
* FinalBoss: Just like in ''Doom II'', The Icon serves as this once again, and this time, it's not a wall texture, but instead a fully-fledged ''colossal'' demon.
* GodzillaThreshold: The Khan Maykr considers it this, as releasing the Icon onto Earth would mean that the entire world would be assimilated into Hell, preventing the world from being reused as a source of souls after humanity had recovered from their near-extinction. But with the loss of the Hell Priests, it becomes the only plan she has to continue the collection of Earth's souls before the Doom Slayer comes for her.
* GoodOldFisticuffs: Don't let your guard down by thinking it only has fire and ranged attacks. It can and will regularly use its fists to strike at you or the arena in general, and those punches ''hurt''.
* HornedHumanoid: With a pair of big, goatlike horns.
* HumanoidAbomination: A humanoid, goat-headed demon that’s unfathomably old, possesses near-godlike powers and is brought back to life by the Khan Maykr to bring about TheEndOfTheWorldAsWeKnowIt. While the Doom Slayer may be called the BeastOfTheApocalypse, this entity is the real deal in the traditional sense.
* {{Immortality}}: As mentioned by Samuel Hayden, only a Crucible blade can stop a Titan, and should the blade be removed the Titan will rise again, no matter how damaged its body is. [[spoiler:Meaning that if the blade of Doom Slayer's Crucible is ever removed from the Icon of Sin's head, it would get back up and continue rampaging across Earth.]]
* TheJuggernaut: The Icon of Sin has one purpose: to keep going perpetually, long enough for reality to collapse in on itself by sheer virtue of the Icon existing. To that end, being the size of a high-rise and exorbitantly powerful, the Icon is virtually unstoppable by conventional means. It walks through buildings like it was wading through water, and it only bothers stopping for anything when it's encountered by Hell's mortal enemy. Not even being physically killed will stop it, as the Icon will eventually just ''get back up'' again [[spoiler:unless a Crucible keeps it out of commission]].
* {{Kaiju}}: It's the size of a skyscraper, and you literally fight it while standing on a skyscraper yourself.
* MagicPants: Of some sort. While the Icon's pelvis is exposed after its armor is destroyed, its leg armor goes unscathed due to the Slayer being at the height of its waist at lowest.
* MightyGlacier: It's every bit as slow-moving as you would expect given its massive size. It hits as hard as you expect as well, and take a massive amount of damage to put down.
* MixAndMatchCritters: A demon with a vaguely human-shaped body, hands like a bat, and a goat-like head.
* MonsterFromBeyondTheVeil: This monster is what became of the son of Valen the Betrayer after his dad sold out the Night Sentinels to resurrect him, only to learn the hard way that what he got back was no longer his son.
* PlanetDestroyer: Its primary purpose is to warp the reality of whatever dimension it exists in, eventually tearing down spacetime and sending whatever planet it's on straight to Hell to be devoured. This tear in spacetime would create an ever-growing black hole that, unbound, would send not only Earth but the ''entire universe straight to Hell''.
* PlayingWithFire: It can shoot jets of flame from its hands, launch a barrage of fireballs from the inverted pentagram on its head, and summon blazing meteor storms.
* PoweredArmor: In its first phase, it's clad in an exoskeleton of Maykr design which protects its body. This suit was designed as a means of controlling it, but due to the Slayer interfering with its resurrection and the subsequent death of the Khan Maykr, the Icon answers to no one.
* RealityWarper: Its mere presence twists the world around it.
* RestrainingBolt: The heart of the Betrayer’s son, housing the remains of his soul, is what keeps the Icon of Sin dormant when not in use. The Maykrs planned to use it to help control the beast, but when it's destroyed, the Icon immediately starts a rampage to consume all of reality.
* StationaryBoss: It has a ''little'' more freedom of movement than your typical FPS "Giant Torso Boss", but is otherwise a pretty typical example of the trope. Until the second phase, that is, where it'll move around the building you're on to rain attacks on you from different angles.
* StrippedToTheBone: It takes reducing it to a mere skeleton with scraps of muscle hanging on to finally open it up for a finishing blow.
* ThinkingUpPortals: Can apparently create portals at will. It uses one to invade Earth once it's awakened in Urdak and later summons another one to flee after the Doom Slayer strips its armour off, forcing the Slayer to jump in after it.
* TookALevelInBadass: The last time we saw it in ''Doom II: Hell On Earth'', it was little more than a flat texture on a wall, with its only defensive and offensive capabilities revolving around spawning monsters, and only taking several rockets to put down. Here, it's a titanic, demonic HumanoidAbomination who not only can still spawn monsters but possesses a plethora of direct attacks that can easily kill the Doom Slayer if he lets himself get hit. To make things worse, it's also monumentally tougher to kill, [[RasputinianDeath as the Doom Slayer has to destroy its armour, shred its body with gunfire until it's reduced to a skeleton with a couple of meat chunks still hanging on, and then impale its exposed brain with the Crucible]] (which happens to be literally the only viable method of putting it down). [[spoiler:And that still only puts it out of commission instead of killing it.]]
* TragicVillain: It's only revealed in the backstory, but the Icon was just an ordinary man twisted into this abomination.
* VillainousValor: Even reduced to a mangled mess, it shows no fear of the Slayer. When it retreats through a portal after the first phase, it's evident that it's much less fleeing and much more prepping a change of scenery and tactics.
* WalkingWasteland: It warps reality and terraforms its surroundings into Hellish structures just by existing. If left alone for long enough, its presence will suck the entire universe into Hell.
* WasOnceAMan: Formerly the mortal son of the Betrayer, before being resurrected as a Titan as part of Hell's cruel twist on the Betrayer's DealWithTheDevil.
* WaveMotionGun: One of its attacks has it fire a massive energy ray from its forehead.
[[/folder]]
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* SoleSurvivor: Regardless if he's from an AlternateUniverse Earth or Argent D'Nur originally, the Doom Slayer is this UpToEleven: 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. [[spoiler: [[SubvertedTrope Then it turns out there are surviving Night Sentinels.]] Unfortunately, the ones that survived are working with the Hell Priests.]]

* SoleSurvivor: Regardless if he's from an AlternateUniverse Earth or Argent D'Nur originally, the Doom Slayer is this UpToEleven: 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.

* ReasonableAuthorityFigure: Relatively speaking, when compared to Olivia and ''especially'' the Khan Maykr. He seems to be the only person in the UAC who realizes how much Olivia has been corrupted by Hell and recognizes that a full-on demonic invasion is not a good thing. If he had recognized the immediate threat Olivia posed to the UAC Mars installation, the initial Martian invasion could have been prevented. Furthermore, [[spoiler: after discovering the true nature of [[SouldPoweredEngine Argent Energy]] he forsakes it all together, and instead turns to develop a synthetic alternative to Argent, all the while leading the ARC against the demonic invasion on Earth.]]

* PetTheDog: 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 [[spoiler:Vega]] after the latter pull a HeroicSacrifice.

* ReasonableAuthorityFigure: Relatively speaking, when compared to Olivia and ''especially'' the Khan Maykr. He seems to be the only person in the UAC who realizes how much Olivia has been corrupted by Hell and recognizes that a full-on demonic invasion is not a good thing. If he had recognized the immediate threat Olivia posed to the UAC Mars installation, the initial martian invasion could have been prevented. Furthermore, [[spoiler: after discovering the true nature of [[SouldPoweredEngine Argent Energy]] he forsakes it all together, and instead turns to develop a synthetic alternative to Argent, all the while leading the ARC against the demonic invasion on Earth.]]

* FoodChainOfEvil: They are said to serve as beasts of burden and livestock, with higher demons considering them something of a delicacy.

A trio of demonic suits of armour, each playing host to a diminutive, snakelike creature that controls it.

* WasOnceAMan: [[spoiler:This demonic monstrosity is none other than Olivia Pierce herself, having been "[[BeCarefulWhatYouWishFor rewarded]]" by her demonic superiors.]]

* AchillesHeel: Their shields are vulnerable to the same overcharging effects as the Riot Soldier's, and its' explosion when destroyed is much bigger; this means that they often [[StopHelpingMe endanger their allies FAR more than they help them.]]

* AchillesHeel: The Tyrant is absolutely ''enormous,'' and it has a devastating ranged attack that lets it section off entire portions of the battlefield as inaccessible. However, it's very slow to turn around, and as mentioned before, its' massive size leaves it pretty much impossible to miss; the best way to take one out is to get in close and dance around it while you hammer it with everything you've got. (As noted under ContinuityNod, this is how you dealt with them way back in ''Doom'' (1993).

* AchillesHeel: They are ferociously powerful mid-range combatants who can lock the Slayer down with their plasma turret, but said turret can be destroyed with a Precision Bolt or shotgun-launched grenade. This renders them largely impotent - they are slow, easy to hit, and have no other ranged attacks besides a grenade launcher that roots them in place when they use it.

* AchillesHeel: They're slower and larger than their fellow flying heavies, Cacodemons; they also lack their devastatingly powerful bite, and their projectiles can be shot down, unlike the lightning balls the Caco spits.

* AchillesHeel: The Tyrant is absolutely ''enormous,'' and it has a devastating ranged attack that lets it section off entire portions of the battlefield as inaccessible. However, it's very slow to turn around, and as mentioned before, its' massive size leaves it pretty much impossible to miss; the best way to take one out is to get in close and dance around it while you hammer it with everything you've got.

* AdaptationalAttractiveness: The zombies in ''Eternal'' look more akin to classic zombies than the deformed masses of flesh they were in ''2016''.

* AndIMustScream: According to the Codex, their entire existence is devoted to forging Lost Souls within their stomach, which is an understandably excrutiating process.

* FullFrontalAssault: The zombified civilians in ''Eternal'' and the Unwilling both appear to be totally naked.

** He treats the collectibles (which are cute bobblehead like figures of himself) with care. By the time ''Eternal'' rolls around, he even dedicates an entire room within the Fortress of Doom to housing his collection, neatly laid out as well.

** Later in ''Eternal'', he shows thinly-veiled resentment at [[spoiler:Khan Maykr and [[PoweredByAForsakenChild her methods in creating Argent energy]], as well as the lengths of her desperation to keep [[AGodIAm her power]] by any means necessary, even allying with Hell and damning countless worlds to oblivion]]. It is a key development that contrasts his own prior behaviour that made him almost NotSoDifferent to the [[spoiler:Khan Maykr]].

* AGodAmI: 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.

* AchillesHeel: In ''Eternal,'' they are very tough and hard to stagger, and both of their attacks can easily kill the Slayer in one or two hits, making them a massive threat at any range. However, they can be instantly staggered for a Glory Kill by launching a Frag Grenade or Sticky Bomb into their mouths.

* HumanAlien: [[spoiler:{{Subverted}} as ''Eternal'' reveals that he's none other than ''[[CanonCharacterAllAlong the]]'' [[CanonCharacterAllAlong Doomguy from the original games]], having been found and taken in by the Night Sentinels after spending an unknown amount of time in Hell following the events of ''64''. Though you could make the arguement that he's an alien due to the fact that he's a human from an alternate earth were the UAC weren't evil cultists and just had the misfortune of their teleportation tech opening portals to Hell. This would be a case of DistinctionWithoutDifference as he's still genetically human in spite of being from an alternate earth.]]

* WouldHitAGirl: Several of the demons (namely, Whiplash and Spider Mastermind) are female, yet he will rip and tear them just like any other demon.

** Not only that, she even let [[OneManArmy the Slayer]], whose capacity for destruction she was supposed to be fully aware of, know that [[spoiler: she was going to wake the Icon of Sin!]] She really gave her all to earn this, didn't she?

** With confirmation from ''DOOM: Eternal'' that he's related to Commander Keen and that he's [[spoiler: the Doomguy from the original series,]] it's safe to assume that his name is either [[spoiler: William Joseph "BJ" Blazkowicz III or Stan Blazkowicz]].