The great striped Hoon in Alien in a Small Town is a silicon-based creature shaped like a gigantic caterpillar. Its name comes from the deafening sonic attack it uses to stun its prey.
Cthulhu and his children (Ghatanothoa, Cthulhu's first born, actually has a character directly based on it in Ultraman Tiga).
Horror writer J.F. Gonzalez has his Clickers series, which are about prehistoric giant shellfish with an extremely corrosive venom and thick armour plates that are rising from the sea. And it appears they're fleeing something even bigger and deadlier...
The titular character from the Clifford the Big Red Dog children’s books is a gigantic dinosaur-sized red dog.
Agog Press' Daikaiju! anthology is built around these, and features a number of really weird ideas. How weird? Groundsurfing on the shockwaves made by kaiju's feet as they walk around.
The Atomic Time of Monsters is primarily a homage to this genre, and its story centers around a variety of gigantic monsters, based on both "classic" Kaiju such as Godzilla and giant monster movies such as Them!, clashing and interacting.
At the end of Unseen Academicals, Ridcully informs Ponder that a seventy-foot chicken has broken out of Brazeneck College's Higher Energy Magic building and is rampaging through the streets of Pseudopolis.
Great A'tuin and the four elephants riding its shell would qualify, if they weren't supporting the world rather than stomping all over it.
Moving Pictures features a giant creature from the Dungeon Dimensions stealing the form of a famous actress, escape from the Silver Screen and go on a rampage across Ankh-Morpork and climbing the UU's Tower of Art carrying a screaming ape in an inversion of King Kong.
Satan himself is depicted as one in The Divine Comedy. Dante says that the giants they met earlier (who were around 30 feet tall), were only about as big as big as one of his arms. Fortunately, he's basically harmless due to being trapped in the ice and nearly mindless, as Dante and Virgil are able to climb across his body without him reacting.
As might be guessed by the title, part of the draw of Please Don't Tell My Parents I'm a Giant Monster is that the main character gains the ability to grow to a large size and cause destruction.
The genre is parodied by a series of children's books, one called Dogzilla and one called Kat Kong.
Gigantic monsters appear in the first two of the Dream Park novels. In Dream Park, we get the Nibek, a bizarre, vaguely serpentine monster the size of a house. Then there's the Haiavaha, a Papuan demigod of fire that looks like a twenty-foot-tall ape with the head of a boar, covered in fiery red fur. In The Barsoom Project the Gamers must face a Paija, a female (well, sort of) Inuit demon about twenty feet tall. Then for the final battle, Big Bad Ahk-lut transforms into a Terichik, a worm-like monster over a hundred feet long.
The Sandworms of the Dune books are colossal, subterranean powerhouses that can easily demolish vehicles, settlements, and unfortunate humans who attract their attention from the surface. The sandworm archetype in general could be considered a sub-category of kaiju, at least for the larger instances.
In Frontlines by Marko Kloos, the Lankies are these, standing about eighty feet tall on all fours. They are even more massive than their size suggests, weighing several hundred tons and literally shaking the earth when they walk. Their hides are much tougher than any Real Life organism of similar size, and killing them usually requires heavy weaponry or special depleted-uranium ammunition. Unusually for this trope, they are a fully sentient, technologically advanced, and hostile alien species.
The best example of this in the Gaea Trilogy is probably Gaea's own new avatar in the third novel after her old one comes to a bad end in the second: a giant-sized version of Marilyn Monroe, who even gets into a proper monster brawl twice in that book. (Her opponents in these, her own local version of Kong and Robin's former pet snake grown to giant size for reasons probably related to Gaea just being that sort of world over the years respectively, also qualify.)
Giant Monster Farmarna by Constantine Furman is more or less a Japanese monster movie in literary form concerning the adventures of a kaiju awakened by failed North Korean nuclear missile tests falling into the Northern Pacific.
Gojiro by Mark Jacobson is a deconstruction of Kaiju monsters told from the point of view of the monster Gojiro and his human partner Komodo as they attempt to bring about world peace and prevent the testing of a next-generation nuclear weapon.
Goosebumps: Monster Blood typically makes things grow to giant size, but the second book took it a step further when the climax involved the protagonist eating monster blood to fight a giant hamster eating his school. True to kaiju form, this involves a giant wrestling match.
Alan Dean Foster's He is a short story about a oceanographer’s encounter with a megalodon.
The stavanzer, or thunder-eater, from Alan Dean Foster's Icerigger is a slug-like herbivore over a hundred meters long, and it's mentioned that such creatures have been known to destroy tran settlements.
In The Iron Man, the children's novel by Ted Hughes that was the basis for The Iron Giant, the Iron Man confronts an alien dragon creature somewhat smaller than Australia. While this plot point wasn't featured in the movie, it was featured in "The Iron Man; The Musical", a concept album by Pete Townshend of The Who inspired by the novel.
Journey to Chaos: The monsters in the S-Class designation are the biggest and most dangerous of all. The ones known as "Tazul" are bigger than the capital city of Ataidar. Their abilities are called "almighty" and all the City Guards can do is shepherd civilians away from them. Only divine magic stands a good chance of stopping them.
Kaiju Rising: Age of Monsters is an anthology by Ragnarok Publications which, as you can expect, is a whole collection of stories related to these. Notable for the fact the majority of them are Downer Ending horror short-stories versus more upbeat monster-fighting ones.
Apophis from The Kane Chronicles is an eldritch version of this. He's an enormous snake who, upon his release, starts out the size of the Great Pyramid and rapidly grows to the size of Cairo. That's not even getting into his supernatural powers, which border on Reality Warper territory.
In the League of Magi stories, Shahmeran's alternate form is a massive serpent.
In The Silmarillion, when Morgoth unleashes the first winged dragons during the Final Battle, they are led by Ancalagon the Black, bred specifically to be the greatest dragon to ever live. He could certainly fit the Kaiju bill: his approach was heralded by a firestorm, and when he died his falling body crushed three of the highest peaks on Middle-Earth which served as Morgoth's Evil Tower of Ominousness. The only things known size-wise about Ancalagon are that when he was finally slain, his downfall destroyed the Thangorodrim. From what we can read in the books, the Thangorodrim is a three-topped mountain with an assumed height of 35,000 feet and a diameter of 5 miles. Considering that the only thing that Tolkien wrote about Dragonmagic was the power of deception, we can probably be sure that the mountains were destroyed purely by his size and weight — so that makes Ancalagon big enough to — in Real Life terms — destroy Mount Everest by simply falling on it. In short: Ancalagon the Black might not just be the biggest Dragon in Tolkien's works, but might even be one of the largest dragons in fiction.
In Steve Alten’s Novel Meg: A Novel of Deep Terror has the ‘Megalodon’ a giant shark which in the opening Prologue eats a Tyrannosaurus rex. In the novel, a pregnant Female Megalodon manages to escape from beneath the Mariana Trench and has to be stopped by Biologist and Palaeontologist Jonas Taylor who saw the giant shark years earlier in a deep sea dive and has been trying to prove it since.
Something inconceivably huge and six-legged walks across the highway in Stephen King's novella The Mist, nearly stomping the protagonists' SUV. Its full size is not specified, as its body is so high that it's obscured by the fog.
In the 1899 short story ''The Monster Of Lake La Metrie' A pair of scientists find an undiscovered Elasmosaur living in a secluded lake high up in the Wyoming mountains, after managing to remove the creatures brain a human brain is then grafted into the body of the Elasmosaur.
The Kaiju Preservation Society by John Scalzi is a cheerful pastiche of traditional kaiju stories. It’s Exactly What It Says on the Tin: the book follows Jamie Gray, Dr. Aparna Chowdhury, Dr. Niamh Healy, and Dr. Katurangi Lautagata on their first tour with the titular society. Notable for the fact that the kaiju are organisms from an alternate Earth. Nuclear energy weakens the barrier between the worlds, allowing travel… and luring kaiju, since they derive sustenance from radiation.
Jeremy Robinson has a passion for kaiju, which is best expressed in his Nemesis Saga series:
Being a kaiju thriller, the series has Nemesis, a 350 ft tall creature created from the DNA of a little girl and an ancient kaiju. With a strong sense of vengeance, she seeks to eradicate all of humanity for its crimes. However, her human side allows her to think and focus her vengeance on specific targets.
The sequel Project Maigo introduces Scylla, Scrion, Drakon, Typhon, and Karkinos. They are siblings, but look very different from each other. Scrion and Drakon are quadrupeds, Scylla's head looks like a hammerhead shark's, Typhon looks like a human male, and Karkinos looks like a bulkier version of Nemesis.
The third book, Project 731, has a Tsuchi — an engineered spider/scorpion/turtle hybrid — inject some of its fast-growing progeny into Nemesis's comatose body, resulting in the creation of the Mega Tsuchi, which are the same but Nemesis sized.
The fourth book, Project Hyperion, gives us two new kaiju, called Lovecraft and Giger, due to respectively resembling Cthulhu and a Xenomorph.
The fifth book, Project Legion, introduces the GUS, or Gasbag of Unusual Size, a mountain sized flying kaiju; Nemesis-Prime, the original kaiju Nemesis’ DNA was taken from and the Maigo kaiju were born from; and Ashtorath, a kaiju made from the DNA of Prime, Lovecraft, and Giger.
Outside of this series, Robinson has also created many kaiju for his “Kaiju Thrillers”, like Kronos, a mosasaur-like kaiju who swallows humans whole; and the Apocalypse Machine, a kaiju who, well, brings the apocalypse.
The avanc from The Scar is an unusual variant, as this gargantuan marine creature didn't destroy a city by stomping through it, but by dragging the floating city of Armada to its doom in the eponymous Scar.
In Seven Stars, the Artifact of Doom responsible for the biblical plagues of Egypt is reactivated in the 21st century and brings about a whole new set of plagues. One, known as the Plague of Dragons or the Plague of Godzillas, sees enormous monsters come out of the ocean and ravage the cities of the world.
In The Southern Reach Trilogy, the biologist eventually becomes an amphibious leviathan with about a thousand eyes. As a bonus, she's actually part Asian.
The Stormlight Archive: "Greatshells" are arthropods of varying size. Most of the largest ones are gone by the start of the story, as their gemhearts are so valuable that they are inevitably hunted to extinction. A large part of the first two books revolves around the chasmfiends, beasts the size of skyscrapers that come to the Shattered Plains to pupate. The Alethi originally came to the Plains to fight the Parshendi for killing their king, but the war soon turned into an elaborate game where highprinces raced each other for the gemhearts. Then there are the tai-na of the Reshi isles, which are greatshells large enough to be mistaken for islands when they're not moving. Not small islands, either. They have full forests growing on their backs.
The Terror of Blue John Gap: The creature is a gigantic blind cave bear-like beast that lives in a underground cavern that comes out at night to steal livestock.
M. Suddain's Theatre of the Gods has the Sweetie. The Sweetie is a bizarre, sobbing monster with tentacular arms. He's also the size of a small planet and he curbstomps a Religion of Evil's space fleet by himself.
In the Carl Macek Novel War Eagles just before World War II J.P. Brandt, an American Air Force pilot is court-martialed when a stunt endangers President Roosevelt. He is able to get a job to fly a plane from the north to South Pole but after the plane is attacked by a Giant White Eagle Brandt and the crew crash on a mysterious island of dinosaurs and a tribe of vikings who ride giant eagles, Brandt is able to tame the Legendary White Eagle which he names “Lindy”.
Worm includes a particularly formidable bunch called the Endbringers: Massive humanoid monstrosities with extremely powerful macro-scale superpowers and Nigh-Invulnerability, which are collectively engaged in a slow but implacable campaign to wipe out humanity for reasons unknown. They include Behemoth, a 45-foot tall creature resembling a gray demon complete with horns with the power of dynakinesis (control over all forms of energy); Leviathan, a 30-foot tall humanoid with a long tail with macrohydrokinesis and a water "shadow"; And the Simurgh, a 15 foot-tall woman with dozens of white, feathered wings that possesses a particularly malevolent form of precognition, mental influence, and telekinesis. They're smaller than most of the creatures on this page, but don't let that fool you; they're every bit as tough, if not more so, and being relatively small means that they're able to hide, ambush people, and enter buildings.
