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* AssassinOutclassin: Generally played straight whenever the forces of Hell send some kind of miniboss to take on the Slayer.
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* AssassinOutclassin: Generally played straight whenever the forces of Hell send some kind of miniboss something to take on the Slayer.
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* 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.
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* AssassinOutclassin: In Generally played straight whenever the forces of Hell send some kind of miniboss to take on the Slayer.
** The Agaddon Hunters were an order of demons assigned specifically to find and assassinate the Slayer and his fellow Night Sentinels. Considering how they are now formally extinct, while the Slayer is not, it's a pretty safe guess what happened. Come ''Eternal'',it’s mentioned that those same demons are rebuilt as the Doom Hunter, a breed Hunters, who are encountered as bosses several times throughout the game, and you're ''still'' outclassin' them.
** Marauder encounters are this taken to its logical extreme. Considering the kind ofdemon game 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.is ''Doom'', if you're not pulling this trope, you're playing it wrong.
** The Agaddon Hunters were an order of demons assigned specifically to find and assassinate the Slayer and his fellow Night Sentinels. Considering how they are now formally extinct, while the Slayer is not, it's a pretty safe guess what happened. Come ''Eternal'',
** Marauder encounters are this taken to its logical extreme. Considering the kind of
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[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/doomguy_eternal.png]]
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[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/doomguy_eternal.org/pmwiki/pub/images/doomguy_eternal_4.png]]
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here, actual render from id rather than deviantart render with incorrect lighting applied.
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changing image to a non oversaturated version, transparent 2016 armor.
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[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/tumblr_dea02967a5b47589dde2196a0e836c83_9d4eab18_1280.png]][[caption-width-right:350:[[labelnote:Click here to see his 2016 appearance]]https://static.tvtropes.org/pmwiki/pub/images/0216c6fb911a14a6d8cd3fad9bde67db.jpg[[/labelnote]]]]
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[[caption-width-right:350:[[labelnote:Click here to see his 2016 appearance]]https://static.tvtropes.
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Adorkable is now a YMMV trope
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* {{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.
** 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.
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* BruiserWithASoftCenter:
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* BruiserWithASoftCenter:BruiserWithASoftCenter: [[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.
** 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.
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* ApeShallNeverKillApe: He may be eye-wateringly violent against demons, but he will never hurt another human except under the absolute most extreme provocation. Even the human employees of a MegaCorp demonic cult will get a DeathGlare at most.
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** 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.
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** 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, gently but firmly 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.
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[[caption-width-right:350:''"Rip and Tear, until it is done."'']]
[[caption-width-right:350:''"Rip and Tear, until it is done."'']]
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[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/doomguy_retracted_2.png]]
[[caption-width-right:350:''"Rip and Tear, until it is done."'']]
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[[caption-width-right:350:''"Rip and Tear, until it is done."'']]
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* 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.
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* 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. No less than ''five'' of the Video Game quotes on the trope page pertain to him, and he's earned them all.
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** Basically, he doesn't care about the consequences of his actions all that much. Because he'll shoot that as well
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* 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]].
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* 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 fit 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]].
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* {{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]].
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* {{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]].
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* 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]].
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* 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 [[IncorruptiblePurePureness 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]].
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** 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.'']]
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** He was the [[spoiler: king champion 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.'']]
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* 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.
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* JerkWithAHeartOfGold: 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’ssurvival.survival.
** As he was about to destroy VEGA's central core, he immediately creates a backup copy on his person before VEGA dies out. He knew full well VEGA would be KilledOffForReal, but his last-second conscious allowed VEGA to stay alive.
** 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
** As he was about to destroy VEGA's central core, he immediately creates a backup copy on his person before VEGA dies out. He knew full well VEGA would be KilledOffForReal, but his last-second conscious allowed VEGA to stay alive.
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* UnfortunateName: With the confirmation that [[spoiler:Doomslayer is Doomguy from the original games]], it can be assumed that his name is either [[spoiler:William Joseph "BJ" Blazkowicz III or Stan Blazkowicz]]. The latter and [[spoiler:William]] are fine in themselves, but since [[spoiler:BJ]] is short for "blowjob", things take a turn for the unfortunate.
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* ScrewDestiny: ''Oh boy.'' If it's supposedly written that humanity will fuel Urdak, then it's time for the Slayer to do some book burning.
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* GunNut: As Hayden notes, his enthusiasm for firepower is very evident. It's best communicated in ''Eternal'', where when he finally arrives at the helm of the [=BFG-10K=] only for the built-in protocols to kick in.
-->'''VEGA''': Would you like me to disable the safety protocols?
-->'''Slayer''': [[AskAStupidQuestion *Mashes fire button furiously*]]
-->'''VEGA''': Would you like me to disable the safety protocols?
-->'''Slayer''': [[AskAStupidQuestion *Mashes fire button furiously*]]
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* 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.
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* 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.Marauders. 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.
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* 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.
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* 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. In ''Eternal'' he shoots a hole in Mars because he needs to get to its core fast.
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* ExpansionPackPast: ''2016'' explained the Doom Slayer was the last surviving Night Sentinel who spent an unknown period of time rampaging through Hell in retribution for the fall of Argent D'Nur. ''Eternal'' then expanded his backstory by not only revealing the details of Argent D'Nur's fall and how it relates to him, but also that he was originally [[spoiler:the Doomguy from the original games. After fighting his way through Hell, he emerged in the distant past and created an AlternateTimeline when he was taken in by the Argenta and became the Doom Slayer]].
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* ExpansionPackPast: ''2016'' explained the Doom Slayer was the last surviving Night Sentinel who spent an unknown period of time rampaging through Hell in retribution for the fall of Argent D'Nur. ''Eternal'' then expanded his backstory by not only revealing the details of Argent D'Nur's fall and how it relates to him, but also that he was originally [[spoiler:the Doomguy from the original games. After fighting his way through Hell, he emerged He entered Hell in ''Doom 64'' to battle the demons eternally only to emerge in the distant past and created on Argent D'Nur in an AlternateTimeline when he was taken in by the Argenta and became the Doom Slayer]].AlternateTimeline]].
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* ExpansionPackPast: ''2016'' explained the Doom Slayer was the last surviving Night Sentinel who spent an unknown period of time rampaging through Hell in retribution for the fall of Argent D'Nur. ''Eternal'' then expanded his backstory by not only revealing the details of Argent D'Nur's fall and how it relates to him, but also that he was originally [[spoiler:the Doomguy from the original games. After fighting his way through Hell, he emerged in the distant past and created an AlternateTimeline when he was taken in by the Argenta and became the Doom Slayer]].
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the folders bugger up the formatting of the page, leaving a ton of blank space next to the image.
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[[WMG:[[center: [-''VideoGame/Doom2016'' and ''VideoGame/DoomEternal'' '''[[Characters/Doom2016 Character Index]]'''\\
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[[WMG:[[center: [-''VideoGame/Doom2016'' and ''VideoGame/DoomEternal'' '''[[Characters/Doom2016 Main Character Index]]'''\\
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'''The Doom Slayer''' | [[Characters/Doom2016Demons Demons]] | [[CharactersDoom2016UACAndARC UAC and ARC]] | [[Characters/Doom2016MaykrsAndArgenta Maykrs and Argenta]] -]]]]]
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'''The Doom Slayer''' | [[Characters/Doom2016Demons Demons]] | [[CharactersDoom2016UACAndARC [[Characters/Doom2016UACAndARC UAC and ARC]] | [[Characters/Doom2016MaykrsAndArgenta Maykrs and Argenta]] -]]]]]
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%%Do not change the quote without discussing it first on the discussion page.
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%%Do not change the quote quotes without discussing it first on the discussion page.
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''The Doom Slayer'' | [[Characters/Doom2016Demons Demons]] | [[CharactersDoom2016UACAndARC UAC and ARC]] | [[Characters/Doom2016MaykrsAndArgenta Maykrs and Argenta]] -]]]]]
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%%Do not change the quote without discussing it first on the discussion page.
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[[WMG:[[center: [-''VideoGame/Doom2016'' and ''VideoGame/DoomEternal'' '''[[Characters/Doom2016 Character Index]]'''\\
''The Doom Slayer'' | [[Characters/Doom2016Demons Demons]] | [[CharactersDoom2016UACAndARC UAC and ARC]] | [[Characters/Doom2016MaykrsAndArgenta Maykrs and Argenta]] -]]]]]
!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]].
----
%%
[[WMG:[[center: [-''VideoGame/Doom2016'' and ''VideoGame/DoomEternal'' '''[[Characters/Doom2016 Character Index]]'''\\
''The Doom Slayer'' | [[Characters/Doom2016Demons Demons]] | [[CharactersDoom2016UACAndARC UAC and ARC]] | [[Characters/Doom2016MaykrsAndArgenta Maykrs and Argenta]] -]]]]]
!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]].
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