Apparently in DOOM:ETERNAL the slayer has a entire library full of little references to other games (like "Why Im So Great Pt.II by:Dork Norkem")
the wait for this game is killing me, im fucking psyched

Credits
Doom Slayer [P.M]-BlueFlytrap(original model)Ported to GMOD by-o u t l a w
DOOM Weapons Part 1 and 2-Ported to GMOD by-Stefano
DOOM (2016) SNPCs Redux-Rex
Placeable Particle Effects-Bombobux (npc_teslacybertruck_driver, now I guess???)
Advanced Light Entities-tau
Doom 3 Model Pack-Ported to GMOD by-Half-Dead
gmDoom-demon magicked to GMOD by-ghor
Material Editor Tool-zamboni
More Post Processing Effects-Rubat(steam)