Lovecraftian Horrors

"It was a terrible, indescribable thing vaster than any subway train—a shapeless congeries of protoplasmic bubbles, faintly self-luminous, and with myriads of temporary eyes forming and un-forming as pustules of greenish light all over the tunnel-filling front that bore down upon us, crushing the frantic penguins and slithering over the glistening floor that it and its kind had swept so evilly free of all litter."

- A description of Shoggoth. "To invoke the hive-mind representing chaos. Invoking the feeling of chaos. Without order. The Nezperdian hive-mind of chaos. Zalgo. He who Waits Behind The Wall. ZALGO!"

- Description of Zalgo.

The term "Lovecraftian Horrors", also known as Eldritch Abominations or Cosmic Horrors, applies to villains (and in some cases objects, places, or even events) that are or eventually transform into otherworldly entities or objects beyond rationalization, too alien from "normal" flesh-and-blood beings to be described properly, and most often madness-inducing. Alternatively, beings whose aspect is clearly stated to be an approximation of what they really are, something that humans can process while their real form is inconceivable. At the very least they must be as close as possible to such beings and a clear, stated tribute to Lovecraft.

History
Howard Phillips Lovecraft, simply known as H.P. Lovecraft or Lovecraft for short, was a horror writer who influenced the genre greatly. Instead of traditional villains, he created "horrors": indescribable, indefinable, inconceivable beings, whose existence contradicts the laws of physics, whose aspect alone is beyond human logic, and as such can induce madness by their mere presence. Although malevolent by human standards, most of Lovecraft's "horrors" are amoral beings that are either insane or too alien for humans to understand. Very few of them are desirable to be around, however, and thus are similar to villains in the sense of being harmful, and generally a threat to the world at large.

Other Variants
The fame of Lovecraftian Horror theme also led to developement of other variants of Lovecraftian Horrors such as:

Animalistic Abominations
Animalistic Abominations are Lovecraftian Beings that have animalistic characteristics or rather being animals with Lovecraftian attributes. This form of Lovecraftian may portrayed as non-sapient or semi-sapient beast whom more than often Eldritch in origin. They can also started off as normal animals until something happened on them and turned them into Lovecraftian beasts.

Humanoid Abominations
Humanoid Abominations are form of Eldritch Abominations that can pass on as human or at least as humanoid beings. What made these Eldritch entities more tricky than standard Eldritch Abominations are their capabilities to pass on as humans, interacts, and even behaves like normal humans do to conceal their inconceivable and horrific nature. It's more than often many humans whom interacts with Humanoid Abominations not realizing what their true self are until it's too late. However, some humanoid abominations actually do started off as a typical human being, but something went wrong at some point in their lifetime that resulting them gained horrific disfigurement and powers so hideous and ugly that date to gaze or have a glimpse of their true form would render one become insane.

Mechanical Abominations
Mechanical Abominations are Artificial Intelligence (be it steampunk-esque robots or sentient programs) that is created by a certain civilazation through either Lovecraftian-esque sorcery or simply advanced technology whom continues to upgrade, evolve, and build upon itself until the extent of its power is unfathomable. Because of it, the said A.I.'s development, physical and mental sentience, and functioning capabilities evolved to the point of being unpredictable and incomprehensible to humans. Famous example of Mechanical Abomination is Skynet of Terminator franchise whom since becoming self-aware, has developed itself to the point of beyond its human creators' capabilities to understanding it.

Literature

 * Cthulhu (H.P. Lovecraft).
 * Shoggoth (H.P. Lovecraft).
 * Azathoth (H.P. Lovecraft).
 * Nyarlathotep (H.P. Lovecraft).
 * Pennywise (It).
 * The Nothing (The Neverending Story).
 * Hollows (Miss Peregrine's Home for Peculiar Children).

Films

 * Gozer (Ghostbusters).
 * Deadites (Evil Dead franchise).
 * Death (Final Destination franchise).
 * The Nightmare King (Little Nemo: Adventures in Slumberland).
 * Labby (Where the Dead Go to Die).
 * Mister Babadook (The Babadook).
 * Skynet (Terminator franchise).
 * The Garden of Eyes (Kubo and the Two Strings).
 * The Demon (Rock & Rule).

Internet

 * Zalgo
 * Slender Man
 * Smile Dog
 * SCP-106
 * SCP-058
 * Scarlet King

Comics

 * Red Lantern Corps (DC Comics).
 * Dormammu (Marvel).
 * Ego (Marvel).

Television

 * Old Ones (Justice League).
 * Ichthultu (Justice League).
 * The Darkness (Supernatural).
 * The God of Darkness (RWBY).
 * The Monster (Stranger Things).
 * Gunter (Adventure Time).
 * House (Doctor Who).
 * The Beast (Over the Garden Wall).
 * The Lich (Adventure Time).
 * Bill Cipher (Gravity Falls).

Videogames

 * Flowey (Undertale)
 * God (Silent Hill)
 * Phantom (Silent Hill)
 * Gravemind (Halo franchise)
 * Dormin (Shadow of the Colossus)
 * Black Beast (BlazBlue)
 * The Queen of Hearts (American McGee's Alice)
 * Lusamine's Nihilego (Pokémon Sun and Moon)
 * Giygas (Mother/EarthBound franchise)
 * Lavos (Chrono Trigger)

Anime and Manga

 * Kyuubey (Puella Magi Madoka Magica)
 * Buu (Dragon Ball franchise)
 * Alucard (Hellsing franchise)
 * Chaos (Sailor Moon)
 * Pride (Fullmetal Alchemist franchise)
 * Truth (Fullmetal Alchemist franchise)

Toys

 * Makuta Teridax (LEGO BIONICLE franchise)

Gallery
NOTE: The limit is for 20 pictures only