The Cacodemon appears in both Doom RPG and Doom II RPG as a class of monster. There are three variations, identified by color:

The flying, gurgling, squelching Cacodemon is arguably the most iconic monster in the entire DOOM franchise. In fact, it’s the mascot of the very first Classic DOOM. Cacodemons were regularly referenced in the Star Wars franchise starting with the second issue of Star Wars Gamer on November 1, 2000 and some media after, where they are bodiless creatures from the underworld mentioned in the folklore of the galaxy and have some relation to Dark Side cults. The "Astral Dreadnought" creature which the Cacodemon sprite was cropped from, on the cover of the Manual of the Planes. It portrays the Cacodemon “floating” over snowy ruins, an illusion created by being mounted on a clear post. As you can see in the images above, the statue is finely detailed in the ways it’s been sculpted and painted. A short series of plush cacos known as "cacopets" were created by Laura Herrmann (BahdKo). One such was given to Dylan McIntosh (Toke) as a gift in August of 2001. Cacopet is smaller than Hissy, a brighter shade of red, and is more round, but is otherwise quite similar in appearance. Toke's cacopet is now cared for by his longtime friend Ganja.

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It’s an adorable version of the very first Cacodemon, in all its bright red glory. It’s big, round, and covered in soft plush. It’s got those little horns and that goofy grin with huge, silly teeth. The Cacodemon is used as the Icon for the Xbox 360 Arcade version of Doom, specifically in the game library and on the Achievement screen. The sequel, Doom II, simply uses the title rather than a monster to represent the icon. If it looks like Hell has frozen over, you know you’ve reached the Cursed Citadel. The DOOM Eternal Cacodemon Statue is a piece of art you can keep in honor of this place and one of the demons you can meet there when you visit. The earliest known version of Doom to include Cacodemon graphics is the 0.5 alpha, released on May 22, 1993, and the earliest known appearance of the monster as an in-game adversary is in the press release version of Doom, released on October 4, 1993. Put your Super Shotgun away and snuggle up to your DOOM Classic Oversized Cacodemon Plush! FEATURES

The earliest known version of Doom to include cacodemon graphics is the 0.5 alpha, released on May 22, 1993, and the earliest known appearance of the monster as an in-game adversary is in the press release version of Doom, released on October 4, 1993. The illustration on the cover of the Manual of the Planes from which the cacodemon sprite was cropped The monster's general visual design is similar to that of the Beholder, a similarly one-eyed classic Dungeons & Dragons monster (with eye stalks instead of horns). In addition, the cacodemon was created from a cropping of a creature that appears on the cover of Manual of the Planes, a Dungeons & Dragons expansion book. The creature itself is known as an astral dreadnought, and was created by Jeff Easley for that book. Of the maps covered on the Doom Wiki, the following have the highest numbers of cacodemons in single-player:Strangely enough, Cacodemons bleed red when shot at (or green in the GBA versions), yet bleed blue when killed.

The name cacodemon, derived from the Greek κακοδαίμων (kakodaimon), was likely intended to convey the meaning of "evil spirit", or more conventionally, demon. The original Greek term, in use since ancient times, actually means "wretched" or "ill-fated" and does not have supernatural connotations. Standing at an adorable 3 inches tall, the Mini Cacodemon Collectible joins the rest of the gang. They’re all in the same scale and would look amazing on your desk or shelf. Hardcoded exception to infighting negates damage (excepting indirect damage caused by exploding barrels). Pixel is a plush-toy cacodemon created in November 2004 by Doom enthusiast Hughe, in response to a challenge from a friend. Pixel was created to be as accurate in form as possible using five different materials, including all his horns, separate teeth, upper mouth and single eye. Pixel was created before Hughe had any knowledge of the plush Hissy, and was in no way made to compete with her. In fact, it is said that Pixel finds Hissy rather cute. There are only 1,200 pieces worldwide of this limited edition collectible, each with an individual number and Certificate of Authenticity. Due to the hand-painted nature of this item, each piece will have slight variations, making yours truly unique.Cacodemons emit a loud hissing sound when they first see the player or otherwise become active, and use the pain sound shared by most of the demonic monsters from Doom. When killed, they let out a gurgling moan and fall from the air, splitting open like rotten melons as they crash. These death animation frames are unique, as they depict the monster in agony, spewing copious amounts of blue blood, with its intestines and eye flying out upon impact with the ground. Hughe later made a second, named Sprite. Sprite was made of a couple different materials; and is believed to guard Hughe's desk at the Sony offices in London.

With its standout design, it has attracted some unlikely but welcome adoration. In a world of hideous hellspawn, the Cacodemon is the closest thing a creature can get to being cute. And it just got cuter. Because of their flight ability and versatility, it is not uncommon to see cacodemons flying out of unexpected places once alerted. Cacodemon" or "cacodæmon" comes from Ancient Greek and means "evil spirit"; it had entered Old English by the 12th century. In ancient Greek, "demon" or "dæmon" simply meant "spirit" and was neutral; the latter spelling (usually with the ligature separated into "ae") still has neutral uses to this day. The monster's general visual design is similar to that of the Beholder, a similarly one-eyed classic Dungeons & Dragons monster (with eye stalks instead of horns). In addition, the Cacodemon was created from a cropping of a creature that appears on the cover of Manual of the Planes, a Dungeons & Dragons expansion book. The creature itself is known as an Astral Dreadnought, and was created by Jeff Easley for that book. Doom Eternal makes a reference to the Astral Dreadnought in its codex entry for the cultist base, citing a mythic cyclopean giant from Argent D'Nur's past, called an "Aggaddian."The cacodemon is used as the Icon for the Xbox 360 Arcade version of Doom, specifically in the game library and on the Achievement screen. The sequel, Doom II, simply uses the title rather than a monster to represent the icon. It is also the icon for The Ultimate Doom in the Steam game library and as the executable icon. Display it right next to your other DOOM Eternal mini figures to enjoy and recreate the game’s Fortress of DOOM experience. SPECIFICATIONS The name Cacodemon, which comes from the Greek κακοδαίμων (kakodaimon) usually meaning "evil spirit", a more precise name for what is generally known as demon (which ultimately comes from "god" or "spirit"), is in English a word that may be found in most comprehensive dictionaries. The demon’s body features translucent washes, protruding veins, a host of spikes and smatterings of red on the skin. There’s a discernible difference between the rendering of the tough hide and the soft flesh. This lifelike and realistic look is achieved because of the level of detail Polyresin allows and is further enhanced by a semi-gloss finish. Cacodemons are called pumpkins in the Doom novels, and the marine in the Doom comic refers to them as "big-mouthed floating thingies."