Doom Slayer

The Doom Slayer, also known as , is the titular main protagonist of the franchise.
He is a mysterious, yet violent space marine with a sworn hatred of demons, who regularly wages one-man wars against the forces of Hell. Despite his sadistic tendencies and antisocial behavior, the Doom Slayer's heroic efforts have nonetheless led to him being hailed as the savior of the human race and the bane of Hell itself. Additionally, he is a creation of his archenemy, the Dark Lord, and is implied to be the descendant of B.J. Blazkowicz and Commander Keen.
In the 2005 film, he was portrayed by Karl Urban, who also portrayed Skurge in Thor: Ragnarok, Judge Dredd in Dredd, and Billy Butcher in The Boys. In Doom: Annihilation, another film, he was replaced by a different character played by Amy Manson. In Doom: Eternal he was played by Matthew Waterson. In Japanese dub he is voiced by , who also voices Mickey Mouse in Disney series and Razputin Aquato in Psychonauts video game series.
==Biography==
=== Central Timeline ===
==== Past ====
Not too much is known about Doomguy's history before the events of the series. This is because, according to series co-creator John Romero, that little information was given about Doomguy's backstory in order for the player to better place themselves in his role. Id Software has stated their games shared the same continuity, and that Doomguy is the son of Commander Keen, who is the grandson of William "B.J." Blazkowicz, which would effectively make Doomguy "William "B.J." Blazkowicz III". As a nod to this, the spin-off game Doom II RPG introduces a playable character named Stan "Sarge" Blazkowicz who reuses the Doomguy's facial sprite. 
What is known is that Doomguy was an enlisted man in the marines. He owned a pet rabbit who he named Daisy and was very fond of. Along with this, it is shown that Doomguy actually had a wife and an unidentified child, as shown in a family photo that can be found in Doom Eternal. Before the start of his demon-slaying career he, and presumably the rest of his team, was sent to serve in Union Aerospace Corporation (UAC) security on Mars as a punishment for punching his superior officer, who ordered Doomguy to fire upon innocent civilians during an unknown conflict. This shows that he will go as far as committing insubordination to protect innocent people.
==== Doom (1993) ====
While on Mars, a catastrophic failure occurred when scientists tried to master interdimensional travel so they could open portals between Phobos and Deimos. The failure caused Deimos to disappear, and a portal to Hell to open, causing a hellish invasion. With Doomguy's unit being the only battle-ready unit on Mars, they were sent to Phobos for damage control. Doomguy was left alone to guard the exterior with only a pistol, while his buddies went to confront the situation.
All of his comrades ended up either dead or transformed into Zombiemen. Doomguy went in to confront the demons, grabbing more weapons along the way, like the shotgun and plasma rifle, as well as one of the most iconic weapons in his arsenal: the BFG 9000. After killing the Barons of Hell on Phobos, he attempts to escape the moon by teleporting off of it, however, he is attacked by demons and is outnumbered, causing him to die and be sent to hell on Deimos, which is now inside of hell. He later killed the Cyberdemon, one of the head demons. It was there that he learned that Deimos was now floating above Hell itself. He went into the nightmarish landscape, and slaughtered as many demons as he could, including the leader of the invasion, the Spider Mastermind. After killing it, Doomguy entered a portal and returned to Earth.
When he came back, however, everything was in chaos. The demons used the same portal and used it to invade Earth. killing billions of humans, as well as Doomguy's pet rabbit, Daisy. Doomguy then fights to stop the demons from killing the remaining humans, and he once again kills the Spider Mastermind. This is where he learned that not only did the demons use the same portal he used, but they killed his pet rabbit. Filled with anger, grief, and a thirst for vengeance, Doomguy went out to bring the pain to the demons, that caused him this tragedy.
==== DOOM 2: Hell on Earth ====
DOOM 2: Hell on Earth picks up right where the original game left off. Ever since they left Hell, the demons have caused destruction, chaos, and mayhem on Earth, killing billions of innocent civilians. The only way for the survivors to evacuate Earth is to head to the last Starport, but it was occupied by the demons. Luckily, Doomguy went there and cleared out the Starport, finishing off demons like Pain Elementals and Revenants, allowing the humans to evacuate the planet. After leaving, the humans helped Doomguy by pinpointing the origin of the invasion: his hometown. He went to the very place that built him into the man he became, slaying all demonic invaders there. He later came back to Hell, killing the Icon of Sin, thus stopping the demonic invasion in its tracks, allowing the remaining humans to come back whenever they are ready to rebuild. He then returns home, victorious. 
==== Doom 64 ====
Mankind has returned to Earth and begun to rebuild, but Doomguy was not feeling peace. After traveling through Hell and back three times and counting, he suffered from nightmares and mental trauma, something the UAC psychologists could not fully treat. After several years, the Doomguy is pulled back into action during his extended vacation. One of the UAC's abandoned research facilities, which had been thought sterilized of demonic presence by use of heavy radiation, is now sending an early warning transmission about another growing demonic invasion. Doomguy suits up, ready to hunt the new source of the demons. 
After another long, hard battle with the newly empowered demons, Doomguy stands victorious over the "Mother Demon" and her resurrected army. Doomguy swears that he will remain in Hell for all eternity, ready to do battle and ensure that the demons will never again rise to power and threaten mankind.
==== Before Doom (2016) ====
Doomguy, after many years of battle, ends up going into a different dimension and ending up on the planet Argent D'Nur. There he is captured by the world's inhabitants, the Argenta, and brought before the Order of the Deag in Sentinel Prime. The Argenta were unable to understand his language and he was incoherent, as his mind was crippled with rage and ptsd and he could only think about demons. The Priests decided to put him through a trial by combat in the Blood Arena in order to judge on whether he would gain his freedom. Eventually, Doomguy proved himself to be extraordinarily skilled and earning the admiration of the Argenta. This garnered the attention of the clergy and ruling powers of Argent D'Nur, including the Khan Maykr herself, and he was taken in and trained in their military. 
Eventually, Argent D'Nur was invaded by the demons and Doomguy immediately entered the fight; in which his fervor for their destruction soon caught the attention of King Novik, who deemed him worthy to join the Night Sentinels. Doomguy participated in a pivotal battle against the Dreadnought, a monstrous Titan sent to lead a total demonic assault on the heart of Argent D'Nur. As the Sentinels were nearly overwhelmed by the demons, Doomguy was approached by a Maykr, known as the Seraphim, who offered his help to defeat the Dreadnought. The Maykr and the other priests would then perform a ritual on Doomguy which would turn him into the strongest version of himself possible. After this, he would fight alongside the night sentinels for years, slaying countless demons with them. Before long, the demons would grow to fear him and eventually, he would be known as, The Doom Slayer. 
Hell sent all their forces after him to end his scourge of hell, but none prevailed. This would even include a titan demon, who he also managed to kill. The Doom Slayer was unstoppable. Having failed to kill the Slayer at every attempt, the demons instead lured him into a Blood Temple before collapsing the entire structure on top of him. Trapped beneath the ruin, the Slayer was entombed within a sarcophagus and frozen in stasis within the Kadingir Sanctum. He would remain there for an extremely long time until he was found and recovered by an Union Aerospace Corporation expedition led by Dr. Samuel Hayden while procuring demon specimens and Hell artifacts. Hayden led his forces in defeating the demons that fiercely guarded the sarcophagus and taking the Slayer to the UAC facility on Mars. Upon identifying the Slayer and his armor from within the Helix Stone, and the developing suspicion of his employee and former protégé Olivia Pierce, Samuel had the sarcophagus hidden in a concealed location within the UAC facility. Upon suspecting Olivia's pact with Hell and her plans for the Mars facility, Samuel intended to release the Doom Slayer in the event of the UAC losing control of its demonic experiments.
==== Doom (2016) ====
The Slayer is awakened after an unknown amount of time by Samuel Hayden during a demonic invasion of Mars triggered by Olivia Pierce. Upon breaking out of the facility he proceeds to Resource Operations to repair a satellite dish in order to get a complete picture of the situation. Hayden stops the Slayer from accessing the information in question and guides him to a VEGA terminal in order to give the Slayer an argent cell to improve his suit. The Slayer proceeds through the Foundry, stopping a meltdown by activating the terminals and then onto the Argent Tower itself. Despite instructions from Hayden, the Slayer smashes the filters channeling Argent energy to stop Pierce from opening a Hell portal. Despite this, upon reaching the top of the tower and confronting Pierce she uses an Argent Accumulator to break open the rift into Hell and warping the Slayer to Kadingir Sanctum.
He fought his way through the Sanctum to the location where his Sarcophagus was located in order to use the portal equipment left from a manned UAC expedition. Upon returning to Mars, he finds the UAC facility overrun with demons as the demonic portal allows them easy access to the red planet. He finally meets Hayden face to face and Hayden instructs him in finding the Helix Stone to locate the Well and ending the Hell invasion, as well implanting a program into his suit that will allow him to teleport the Slayer back to Mars. The Slayer traveled to the Advanced Research Complex and retrieves the BFG 9000 before proceeding into the heart of the cult activity on Mars. He proceeds to the Lazarus Labs and fights the Cyberdemon before using the accumulator that powered the boss demon to teleport him back into Hell. He then fought his way through the Titan realm and the Necropolis on his way to obtain the Demonic Crucible. After defeating its guardians he retrieved the Crucible and is greeted by ghosts of the Sentinel Knights. Before any exchange can happen, he is teleported back to Mars specifically to VEGA's primary facility. In order to reach The Well and cut off the power source keeping the portal on Mars open he has to overload VEGA's systems to rip open a portal to the Well. Before overloading VEGA's core however, the Slayer pauses and backs up a copy of VEGA onto a thumb drive he takes with him.
Finally, at the Well the Slayer fought his way to each of the Wraith bodies and uses the Crucible to absorb their energy to cut off the flow to the portal. Once the final Wraith has been disabled the Slayer is greeted by several Sentinels who stand guard around a pit leading to the final battle. Here he meets Pierce, bloodied and in shock that she was betrayed by her demonic masters. These same masters then hit her with a crimson lightning bolt, turning her into the Spider Mastermind, though it is ultimately killed by the Slayer. After this Hayden pulls the Slayer back to Mars and keeps him restrained by the teleporter. He takes the Crucible from the Slayer, stating he would use it to continue the production of Argent energy for humanity's benefit. Knowing the Slayer would attempt to stop this plan, Hayden teleports the Slayer away to an unknown location.
==== Doom Eternal ====
As a new demonic threat erupts on Earth, so does the Slayer, his iconic Praetor Suit modified and upgraded for increased mobility and destructive capability. For the Slayer, it is a battle that has continued for an eternity, a fight that can only be won by confronting his past if he hopes to stop history from repeating itself.Art of Doom Eternal, pg 8M
VEGA has created an inter-dimensional man-machine gateway that allows the Slayer to engage in skirmishes across the multiverse directly. As the Slayer enters the gateway, his surroundings take the form of an arena, in tandem with the arrival of adversaries ready for battle Seemingly extracted from the data of his experiences, the opponents the Slayer faces are familiar but now transformed by some unseen force.
With further analysis Vega observed ephemeral distortions within the fabric of reality; scrambled reflections of the physical world. As the slayer interacts with this anomaly, a peculiar ripple in the anomaly's composition emerges, seemingly reacting to the Slayer's presence reflexively. The anomaly reshapes itself, calibrating itself to the Slayer, responding to his memory, ancestral, and memetic data, before ultimately projecting itself onto the Slayer himself.The Art of Doom Eternal, pg 179, 180
Following the events on Mars, the Doom Slayer returned from his banishment with the Fortress of Doom controlled by VEGA and finding Earth invaded by demons. Seeking to end the demonic invasion, the Slayer sought to eliminate the masterminds of the invasion, the Hell Priests Deags Nilox, Ranak, and Grav, while also coming into conflict with the Khan Maykr, who authorized the consumption of Earth in order to harvest the souls of mankind into Argent Energy, following the destruction of the Well.
The Slayer first killed Deag Nilox before confronting Ranak and Grav, displaying their dead colleague's decapitated head before them. The Khan Maykr intervened, teleporting Ranak and Grav away and failing to convince the Slayer to give up in his mission. The Slayer traveled to the Sentinel world of Exultia to retrieve the Celestial Locator that will allow him to find the remaining Hell Priests. There, he encounters the ghost of King Novik, who also tells the Slayer to give up his crusade against Hell and the Maykrs, claiming Earth is no longer his to save. The Slayer then travels to Hell to retrieve a power source for the Celestial Locator from the Betrayer, who also request the Slayer to kill his son that has become the Icon of Sin and gives him a dagger to carry out the deed.
With the Celestial Locator, the Slayer tracked down Ranak in the former UAC Arctic facility, defeating his Doom Hunters, and decapitating the hapless Hell Priest with the Doomblade. His actions caused the Khan Maykr to move Deag Grav to Sentinel Prime. Following VEGA's suggestion, the Slayer embarked on finding Samuel Hayden to find the last Hell Priest. Traveling to the ARC Complex, the Slayer roughly retrieved Hayden's damaged robotic body and recovering the Crucible; in which Hayden had anticipated his return and instructed his ARC caretakers to give the blade to the Slayer. While retrieving Hayden, a corrupted night sentinel, known as a Marauder, approaches and attacks the Slayer only to meet his end shortly after. Upon uploading Hayden's mind into the Fortress of Doom, the Slayer learns from him of Grav's location and that the only access to Sentinel Prime is through a portal in the the city of Hebeth in Mars' core. The Slayer travels to a UAC facility on Phobos where he uses the massive BFG-10000 to blast a hole in Mars, which he uses to reach Hebeth. After arriving in Sentinel Prime, the Slayer fought and killed the Gladiator, and killing Grav by blowing his head up with his Super Shotgun. However, Deag Grav's death on sacred ground cost the Slayer to be excommunicated from the Night Sentinels.
Following the death of the last Hell Priest, the Slayer was temporarily trapped on the Fortress by the Khan Maykr, who remotely shut down the structure to prevent the Slayer from continuing his interference and revealing her intentions to awaken the Icon of Sin. However, the Slayer returned power to the Fortress by using the demonic Crucible as its power source, and later traveling to Argent D'Nur to retrieve his Crucible that he used to slay the Dreadnought and using it to stop the Icon. As the Crucible's blade keeps the Dreadnought from returning to life, the Slayer only took the Crucible's hilt and using it to forge a new blade.
Guided by Hayden, the Slayer fought his way to the roof of Nekravol and using its portal to travel to the Maykr realm of Urdak, where the Khan Maykr prepares to waken the Icon. He interrupts the awakening ceremony and plunging the Betrayer's dagger into the Icon's heart; this destroys the heart and freeing the Icon of Sin from the Maykrs' control and causing the massive demon to destroy the dimensional barrier between Urdak and Hell, thus allowing the demons to break their pact with the Maykrs and directly invading Urdak. The Slayer fought and killed an enraged Khan Maykr before returning to Earth to confront the Icon but is forced to leave VEGA on Urdak in order to open a portal to Earth. Following an intense battle, the Slayer kills the Icon by stabbing the Crucible in its head. With the Icon dead, along with the Hell Priests and the Khan Maykr, demons were momentarily defeated.
=== Doom 3 Timeline ===
Doomguy is once again a nameless space marine who holds the rank of Corporal. As it just so happens, he gets shipped to the UAC Mars research facility with Counselor Swann and his bodyguard Jack Campbell on the same day all Hell breaks loose. Within minutes of the invasion, the main military units are zombified by evil souls, and the remaining staff are killed off by the attacking Demons. Only a few scattered squads remain, mainly Bravo Team, with whom the player tries to regroup for a large part of the game. 
Doomguy's first mission, assigned to him by Master Sergeant Kelly, aka “Sarge”, is to find a missing scientist named Jonathan Ishii who was last seen at the old communications facility. When found, he babbles about sending out a warning - “The Devil is real! I know. I built his cage.” With those words, Hell erupts from the main experimental gateway, sending a shock wave through the complex, along with glowing pentagrams and scores of evil ghost skulls that transform nearly every human into zombies, including Ishii. Leaving Doomguy the only survivor of the wave.
Later in the game, Doomguy runs into a colleague of Betruger, who says that he became obsessed with the teleporters when he figured out Hell existed on the other side. He says he took an artifact called the Soul Cube from the archaeological digs from the ancient Martian civilization into Hell, and demons followed him out.
Doomguy never meets up with the remaining Marines, save for one in a cutscene that dies shortly afterwards. He only reaches Swann and Campbell on their deathbeds. Swann was badly injured, and Campbell went on to hunt Sarge. Swann says that Kelly has turned evil and is now on Betruger’s side. However, Sarge mortally wounded Campbell and acquired his BFG 9000. After killing Sarge, the player finds an archaeologist, who explains that the Soul Cube must be used to stop the demon invasion.
After entering the Primary Dig Site, Doomguy discovers a section of Hell that has crept into the Martian underground and deep within the bowels of this Hellscape, they encounter the invulnerable Cyberdemon guarding a “Hell Hole” — a portal to Hell. Defeating the Cyberdemon, which is only possible with the charged Soul Cube, the Cube seals the Hell hole and the game ends.
Afterwards, a Marine recon team and sentry drones arrive to secure the base and evacuate Doomguy, however Counselor Swann has already died when they find him. Dr. Betruger is nowhere to be seen and has transformed into the Maledict.
=== Film Timeline ===
Grimm, his commanding officer Sarge, and the other members of the RRTS are dispatched to the UAC Olduvai Research Facility to investigate the disappearance of several scientists, where they confront humans who have mutated into demon-like creatures after being injected with an artificial 24th chromosome created from an ancient Martian retrovirus. Grimm is plagued by guilt over his parents' death, and is distracted by concern for his sister, Dr. Samantha Grimm, who is a researcher at the facility.
Grimm clashes with Sarge due to the latter's increasing hostility, aggression, and irrational bloodlust, and John's own high moral standards. This is particularly the case after Sarge callously executes The Kid, a fresh newbie, for insubordination after Sarge orders the mass murder of civilians in the quarantine zone in order to stop the spread of the infection. Grimm and The Kid's conflict with Sarge in this manner is an allusion to the original back story of Doom, in which the Doomguy confronts and assaults his commanding officer for ordering him to fire on civilians.
Near the film's climax, Grimm is fatally wounded and injected with the chromosome by his sister to save his life. Instead of becoming a monster, Grimm is granted superhuman strength, reflexes, and regenerative abilities. These new abilities allow him to single-handedly mow down a horde of monsters, presented in the film in first-person perspective as a direct homage to the film's roots. Grimm is eventually attacked by Sarge, who was also accidentally infected with the experimental chromosome in an earlier monster attack, and mutated into a hideous monster. Grimm manages to force Sarge back through the Ark teleporter, and tosses in a grenade after him, killing him. He then leaves the base as sole survivor of the RRTS, with his nearly unconscious sister in his arms.
=== RPG Timeline ===
Doomguy is a marine employed by the UAC, sent to assist members of the UAC facility on Mars, who are under attack from the denizens of Hell. Doomguy must visit seven "sectors" of the base that have been infested with monsters. Various scientists are encountered along the way, including Dr. Jensen and Dr. Guerard. Examining computer screens and talking with scientists, there are many rumors of a UAC scientist named "Kronos" who was working on teleportation experiments and was fired by the UAC for "security breaches". As the game advances it becomes clear that Kronos is still in the base, and that he is the cause of the attack.
Dr. Guerard begins giving the player instructions. In sector 3, Mr. Nadira lures the player into a trap. The other scientists begin to express their distrust of Guerard and in Sector 6, it is revealed that Nadira and Guerard are working together. Guerard double-crosses Nadira, allowing a demon to kill him.
A second attack leaves the base in ruins; however, Dr. Kelvin opens the door to the Reactor area. Doomguy confronts Guerard at the entrance to the reactor, who reveals that he is Kronos and transforms into a demon. After defeating Kronos, Doomguy destroys the power couplings of the reactor, closing a portal to Hell (the player is hindered by monsters that come through the portal). After having closed the portal, it is revealed that the Cyberdemon, a combination of demon flesh and human technology created by Kronos, came through the portal at the last second. Doomguy must defeat the Cyberdemon to complete the game.
==Other Media==
=== Duke Nukem 3D ===
Doomguy, or more likely a marine that resembles Doomguy, can be found as an easter egg in Duke Nukem 3D. Here, the marine's bloodied and mutilated corpse can be found with Duke insulting him by saying: "That's one DOOMED space marine!". 
===Super Smash Bros. Ultimate===
Doomguy appears as a DLC costume for Mii Gunner in Super Smash Bros. Ultimate.
=== Quake III: Arena ===
Doomguy appears in Quake III: Arena as an enemy and arena gladiator, going under the name Doom. He favors the Railgun and is quite accurate with it, he can be fierce and dangerous when he gets his hands on it. This makes him one of the most challenging opponents in the game. He can also be unlocked as a playable character. In the game, he is shown to be unhinged, paranoid and unstable. Even more so than he is in his game.
===Quake Champions===
Doomguy appears under his other name of Doom Slayer as a playable character in Quake Champions. He features a variety of unlockable skins which showcase various looks from throughout his career. These include a classic 1993 suit, a Doom 3 suit, and a Quake III: Arena suit. He also features his bezerk ability as a chargeable power.
===Tony Hawk Pro Skater 3===
Doomguy is a playable character in Tony Hawk Pro Skater 3 who can be played via cheat code.
== Origins ==
When Doom was in early development, the game was not intended to have a protagonist or a mascot at all. This was because the player was supposed to be the main character themselves. However, the developers soon realized that they had difficulty communicating the player's health. So, the idea to include the protagonist's face on the bottom heads-up-display was added. A character similar to Doomguy can be found in "The Doom Bible", under the name Buddy Dacote can be found. Buddy, much like Doomguy, ends up being killed at the end of Episode 1. 
==Powers and Abilities==
===Powers===
* Transcendent Human Physiology: The Khan Maykr states that the Doom Slayer was once a mortal. Despite fighting with demons for centuries, the Doom Marine did not grow old or lose any of his strengths; he also no longer needs food, drink, or even rest, becoming something akin to an immortal.
**Supernatural Physical Condition: Despite being human, the Doom Marine has shown to possess immense physical prowess which is far beyond human and even most demons. After the blessing of The Seraphim, he gained even greater power matched only by his own will, greatly empowering him to even more impressive levels. These abilities are all further augmented by the Doom Marine's Praetor Suit and are used when fighting against the forces of Hell.
***Superhuman Strength: The Doom Slayer´s strength is one of his most prominent traits. His strength is so great that he has the ability to lift up to 400 Dechelion-tons. Because of this, he can lift heavy objects and throw them a great distance without any effort. He is easily able to smash through walls and has an overall punching force of 4 million-tons. He is also able to carry a great amount of various heavy weapons without tiring The Doom Slayer´s strength allows him to lift heavy objects and throw them on great distance without effort, is able to smash through walls, and carry a great amount of various heavy weapons without tiring. His might is sufficient to grapple and overpower superhumanly strong demons in hand-to-hand combat and perform visceral "Glory Kills" to ensure their complete destruction. The Doom Slayer's strength is also something that cannot be measured as it has no limits to how high it can go. It is stated that the Doom Slayer grows stronger with every being that he has killed due to his body's ability to absorb Argent Energy. After battling the forces of hell for so long, it is impossible to know how strong he can really get.
***Superhuman Durability: Even before his blessing, Doomguy was extremely durable, even on human terms, being able to survive injuries which would kill an average person and even weaker demons. After his transformation and gaining his praetor suit, he becomes near-unstoppable, being able to endure both cold and heat of the Hell, is capable of enduring the hits that the Demons are able to land even of the strongest one as well as falls from great heights which could kill wearer-class demons unfazed.
***Superhuman Speed, Agility, and Reflexes: Even with his heavy armor and equipment, the Unchained Predator is highly mobile with amazing reflexes and reactions. He can outmaneuver his opponents with great dexterity, avoiding their attacks, he is able to jump to great distance both horizontally and vertically and land from heights perfectly. He can also very quickly switch between his weapons.
***Superhuman Stamina and Endurance: The Slayer's most significant feature is his incomprehensible stamina and endurance which are further strengthened by his will. When he was found injured in Sentinel Prime and was sent to the arena, regardless of his injuries he was not only still able to fight, but he managed to win all his battles, gaining admiration from future Hell Priests and even the Khan Maykr herself. After his blessing, he can operate continuously without any rest, food or water.
**Argent Energy Absorption: The Doom Slayer can absorb and metabolize Argent Energy via his Praetor Suit, which reroutes it throughout said combat fatigues subsystems and into his body. This allows him to increase either his Health, Armor or Ammo to maximum levels.
**Destruction Empowerment: The most unique thing about the Doom Slayer is his ability to grow stronger and become even more tenacious with every demon he kills. According to the game's lore, this is the result of Samur Maykr giving the Slayer the ability to absorb the souls of those he killed.
**Powerup Usage: Whereas powerups (such as Berserk and Haste) in the game are described as killing or driving human users mad, the Hell Walker can use these without any trouble, sustaining full control and not taking any damage to either his body or mind from using such artifacts multiple times.
**Rune Absorption and Usage: Through some unknown means, the Slayer is able to use mystic runes that he gains upon completing trials. Once a trial is complete, the Marine can then use a rune to gain new abilities.
**Indomitable Rage: The defining proponent of the Slayer's persona is his undying fury aimed against the forces of Doom. His rage is such that it was enough to keep him alive and propel him forward across worlds & time for the better part of an eternity after he sealed himself in Hell to fight off its accursed denizens. The intense hatred he feels towards the demons and all their affiliates have not only given him insurmountable strength to wade through waves upon waves of monstrous fiends and apparitions but made him legendary in the annals of history across multiple dimensions as well as in their recorded fables.
=== Abilities=== 
*Advanced Intellect: Due to his time spent with technologically advanced civilizations, both within his own home dimension as a Space Marine and in the coming years with the Argentan people before their descent into corruption, the Slayer is able to use technology from other worlds with no signs of unfamiliarity, despite resorting to violence. He has also an adept study of computer sciences as the lore of Doom Eternal, as well as literary paraphernalia within the Fortress suggests. After uploading VEGA's core memory into the Maykr/Argenten stronghold, the Marine had been maintaining its system functionality; showing a keen tech-savviness behind his otherwise brutish approach. He also improves his Praetor suit with the help of VEGA as well as creating his own ballista and training room for keeping his skills sharp.
*Intimidation: Due to his appearance, actions and legend, the Slayer is greatly feared among mankind even though he never injures or kills any of them. The ARC soldiers were terrified when he came before them. Despite that most demons during battle are not frightened by his presence and attack him constantly; the lore entries show that all of Hell itself is terrified by the Doom Marine to an extent that they fought vigorously just to keep him sealed in his tomb when a UAC excursion team came looking for him. The Hell Priests and even the Khan Maykr were greatly terrified of him as well.
* Master Combatant: The Unchained Predator is a highly trained and experienced combatant, even when lacking ammo and weapons, he can slay demons just with his bare hands alone, without the need of any melee weapon, he can defeat and tear apart demons far bigger and stronger than him just with his own skills in hand-to-hand combat. Due to his training with the Night Sentinels, he became quite disciplined and capable of focusing his rage and become proficient with swords and spears. With the Praetor suit, these skills are further increased, making him a monster in both armed and unarmed combat. In his stronghold, he has his own special room where he can summons demons to still maintain and improve his combat abilities. He could overpower entire armies of hell on his own near-effortlessly whatever Earth's defense fails even in their best technology.
**Weapon Mastery: The Doom Marine is capable of using any weapon or firearm in his possession with master proficiency. He can use all artillery he comes across with great effect, while also upgrading and modifying his arsenal. He is also capable of carrying a vast number of weapons, carrying up to 12 weapons including special weapons (Chainsaw and BFG) and grenades. He is also able to use swords and other bladed weaponry equally effectively due to his training and crusades with the Night Sentinels.
*Indomitable Will: The Doom Marine possesses tremendous amount of willpower and determination that cannot be weakened. No matter the situation, opponents or obstacles he pushes forward, refusing to give up regardless of what happened. His determination to wipe out demons and protect humanity has remained with him constantly for years. King Novik describes the Slayer´s will as a sword which cut through his enemies. Though it is only told by demonic recordings, the Doom Slayer had managed to kill Hell's greatest Champion 'the Titan', indicating how he became the most feared being to all of Hell's Legions.
== Weaknesses ==
Limited Vocabulary: Doomguy can only say a few or one word(s) at a time.
==Personality==
Not much is known about Doomguy's feelings, as he is shown to be anti-social and to have a very "shoot first talk second" mentality, but it is known that he loved his pet rabbit Daisy, as he was infuriated and devastated when the demons killed her, which fueled his already-deep hatred towards demons. It is also known that he wants to protect innocent people, as seen by the fact he punched his superior officer for ordering Doomguy to fire upon innocent civilians, and that he has dedicated his life to protecting the people of Earth and Argent D'Nur. The lack of a definite personality and identity is an intentional choice by the games' developers, so that the player fills in the blanks themselves.
In Doom (2016), there are certain actions that slightly delve into Doomguy's personality, such as his care for humanity which seems to be more clearly demonstrated. When the Doomguy, or Doom Slayer as he is referred to as in that game, is contacted by Samuel Hayden, Hayden tries to justify UAC's actions as "bettering humanity", which the Slayer reacts negatively to, as he dismantles a communication device when Hayden speaks to him. He also shows a somewhat sympathetic side, as he makes a copy of an AI, VEGA, instead of completely destroying it.
During the course of Doom (2016), Doom Slayer angrily dismantles UAC equipment when completing certain objectives, even when Samuel Hayden instructs otherwise, showing a very temperamental and aggressive personality. In Doom Eternal, Doom Slayer's personality traits are presented more than any other game in the series, but there are still bits of mystery about it. Though he never harms any other human allies, he's completely indifferent to them, even taking someone's gun for himself and using someone's keycard that was strapped to someone's neck, pulling it and almost choking the man. However, he displayed comradery with the Night Sentinels, regardless of the fact that they weren't human, and did not appear to hold any resentment towards Commander Valen, who was deceived into betraying Argent D'Nur to Hell. Additionally, Doomguy displayed respect for King Novik's ghost, kneeling to the noncorporeal monarch when being addressed, but he put his mission above Novik's commands.
For the first time in the series, Doom Slayer is heard speaking in a flashback in Doom Eternal, as he appears to be in a state of permanent, aggressive rage. The flashback has the Slayer saying, "...guts, huge guts! Kill them... must kill them all!" which explains his constant need to keep killing demons. There are codex entries stating that when he served as a Night Sentinel, Doom Slayer used to speak, but later chose not to, proving that Doom Slayer was possibly more social and/or less indifferent to others. 
It is also shown that he can be paranoid and unhinged, most obviously with his excessive brutality. This is mainly shown in his first Quake appearance and in the comic book. In the Doom novels, he is shown to have a sarcastic, wise-cracky, side to him. As the novels follow a younger Doomguy, this could explain why we never see this side of him ever again. 
Doomguy in general is shown to be heavily traumatized from the things he witnessed during the Phobos takeover and the demonic invasion and the many loved ones it's implied he lost. This trauma materialized in the form of "hell-PTSD", and not even the UAC's best scientists could help him. This caused him constant nightmares, hallucinations, and many other symptoms of severe Post Traumatic Stress Disorder. This trauma could also be the reason why Doomguy almost never speaks throughout the series. 
==Trivia==
* In Doom (2016), the original Doomguy's face appears in one of the Slayer's death animations when in the Classic Maps.
*Fan-theories suggests the Doom Slayer's name could be William Joseph "B.J." Blazkowicz III, but according to official interviews the developers clearly stated he has no name.
**Another possible name is Flynn Taggart from the Doom novels.
*Doomguy being related to William "B.J." Blazkowicz and, as proxy, Commander Keen was essentially confirmed in "Wolfenstein RPG", when a cybordemon appears in front of B.J and engages battle. After B.J defeats him, the demon proclaims that B.J's entire lineage will suffer due to his "heresy". This confirms that Doomguy is part of the Blazkowicz family.
**This is also supported by the fact that Tom Hall, a creative director and game designer for the Doom series, confirmed that the theory is true.
*Doomguy's physical traits where heavily inspired by Sylvester Stallone and Michael Brooker.
**His original face is almost identical to that of B.J, which was modeled after Dolph Lungeran
*Many fans believe Doomguy to be the son of Commander Keen, or Billy Blaze, this is due to his being confirmed to be related to B.J as well as Doomguy.
** This would mean that the "new commander Keen" that was revealed in the trailer for the Commander Keen mobile game could actually be Doomguy, this has neither been denied nor confirmed.
*Despite getting scrapped from the game, Doomguy did originally have fully voiced voice lines for his appearance in Quake III. Why they where scrapped has never been revealed.
*In Doom (2016) and the games that follow, it is speculated that the Doom Slayer has lived through many alternate realities with an altered appearance and history. These worlds could also represent other games in the Doom series which he appears that may or may not fit in the series current timeline.
*Following Doom Eternal's delay and subsequent release on the same day as Animal Crossing: New Horizons, fans from both games began pairing the Doom Slayer and Isabelle together as friends. Both Bethesda and Aya Kyogoku, the director of New Horizons, responded postively to the pairing.
==References==
==External Links==
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