Doom Slayer, or Doomguy (from DOOM 1993) or just his name from the Revelations DLC. Is a armored marine who worked for the UAC, originated from Earth and fought demons like Imps, Barons of Hell, Pinkies, Cyberdemons (or Tyrants), Baron of Hells, etc. Doomguy wears the Praetor Suit. Which covers his whole body. His armor features olive green, and bronze colors on his armor. He wears a fully enclosed helmet with either a black or blue visor (depending if it's 2016 or Eternal). The Slayer carries the Super Shotgun which is a double barreled Shotgun with a hook that can latch onto demons and reel him in. And other weapons like the Crucible Blade, a demonic blade found after killing the Hell Guards in Hell. The demons call him, "The Only Thing They Fear" [I believe] because he was so relentless, aggressive, and they couldn't just kill him. In the reboot [DOOM (2016)] he woke up from the tomb or whatever [PLS FORGIVE ME GNG 😭, I hate my short term memory] and made his way across the UAC base on Mars and more that I will not explain. In TAG Part Two, he killed the creator of the universe, Davoth. Or the Dark Lord. And in the Prequel, The Dark Ages and Revelations. He killed the "Hell Priest" which he was in the medieval ages on Argent D'Nur... yeah also, the Slayer never tires, sleeps, drink, or eats. He can literally fight forever... also, his Praetor Suit is indestructible due to the Architect in the Purgatory... and he also doesn't speak at all. (I am so deeply sorry for not knowing my lore, this is literally all I could do bc of my short term memory)