Stupendous Man

Others

Dinosaurs: Calvin loves dinosaurs and imagines himself as a dinosaur in many of the strips, usually a predator such as a Tyrannosaurus rex on the hunt. Once, he claimed to have discovered Calvinosaurus, a monstrous carnosaur that could devour an Ultrasaurus in one bite. On one occasion, he delivered a "tasteless and entirely uninformative" report on overpopulation, in which Susie Derkins is devoured in the schoolyard by a pack of Deinonychus dinosaurs as a consequence of natural selection." He also pretended to be an Allosaurus fighting a straggler in an Apatosaurus herd. His adventures pretending to behave like dinosaurs usually end with him getting in trouble for making loud dinosaur noises in inappropriate places. Watterson remarked that dinosaurs became "one of favorite additions to the strip".

Adult: Calvin appears in several strips as an adult, often when he's been roped into playing make-believe with Susie Derkins, and the comic itself is drawn in a much darker and more realistic art style reminiscent of early Judge Parker or Rex Morgan, M.D. strips until Calvin gets fed up with the game and the real world scene is revealed. According to Calvin and Hobbes Sunday Pages 1985-1995, Watterson expected the reader to wonder for a moment if Calvin and Hobbes had been dropped in favor of another strip. Watterson mentioned that he enjoyed having the adult Calvin (and adult Susie) get into ridiculous dialogue and actions.

Godzilla: On a number of occasions Calvin appears as a Godzilla-like character and runs around (almost always naked) creating havoc. In one instance he actually refers to his mom as Megalon, one of Godzilla's actual enemies.

Pilot: Calvin often imagines himself to be a pilot. One time he piloted an F-15 to destroy his school; Watterson noted that the large volume of negative mail to a childish fantasy indicated that "Apparently, some of my readers were never kids themselves." In other strips, Calvin flies in the model F-4 he built (which works so badly that he cannot land or eject), aggressively passing other airliners on the tarmac, taking off, and encountering a collision with a landing airliner (the airliner resembles a McDonnell Douglas DC-10. He is also seen captaining a Boeing 727 competing with a rival airline's pilot for the same runway. In another strip, Calvin imagines himself as a pilot headed for St Louis, Missouri in a McDonnell Douglas MD-80 who then decides he wants to see the Grand Canyon up close—in reality, he is actually in the family car going to the store with his mother. He is also seen running for hours in circles outside the house pretending to be a Boeing 727.

Animals: Calvin sees himself in a variety of animal bodies as well, from large mammals to insects, ranging from a veiled chameleon, an ant, a bat, a Great White shark, a Nile crocodile, an African elephant, a Pot bellied pig, a dog, a dung beetle, a dragon, a werewolf, a Blue-ringed octopus, a humpback whale, a chicken, a Song sparrow, a Bald eagle, a hummingbird, a Beaded lizard, a Masai giraffe, a Barn Owl, an Octopus, a Mosquito, a Fly, and even a tiger, appearing as a shorter version of Hobbes.

Forces of nature/objects: Calvin sometimes imagines himself as a gigantic thunderstorm, a "safe" (this came from his using the term "I'm safe!" with his transmogrifier gun, causing him to become one), a light particle, an active volcano, a planet causing a solar eclipse, a "C-bomb," an omnipotent deity, and so on.; Calvin occasionally finds himself being changed into various forms or having rather peculiar things happen to him. For example, he occasionally becomes a giant or a miniature version of himself, somehow reverses his "personal gravity," or becomes half-human, half-fly (as in The Fly). On one occasion, he became 2-dimensional.

Captain Napalm: A superhero who protects "truth, justice and the American Way." Only seen on three occasions and is a satirical Captain America. Calvin draws this character from a comic book hero of the same name, leader of the "Thermonuclear League of Liberty," whose exploits he reads, though he is rarely seen with a new issue. According to Calvin, Hobbes reads Calvin's comic books, neglects to put them back in the correct order, spoils the plots of Calvin's new issues by reading them first and commenting on the story as he reads, and mistreats the comics by drawing mustaches on everyone's faces. Captain Napalm trading cards can be obtained from bubble gum packs, and Calvin, being an avid gum fan, has collected nearly the whole series "except 8 and 34" after chewing almost $20 worth of gum.

Pirate ("Cap'n Calvin"): On several occasions Calvin has imagined himself as a pirate. In the first, it was shown from a 'real world' point of view, with himself and Hobbes playing in the treehouse. At the end, Hobbes gave Calvin a boot and said that it was their "booty". On another occasion, Calvin imagines himself on a ship on the high seas, calling out "Prepare the plank!" to which the comic shifts back to Calvin and Hobbes sitting on a crude raft in a pond, with Hobbes remarking, "Our ship is a plank." In response, Calvin says, "And you're gonna walk it, wise guy!"

Safari Al: In one small instance, Calvin imagines himself as a safari-explorer, hacking his way through a thick jungle (which later turns out to be his messy room) with a machete.

Calvin the Criminal: In one strip Calvin imagines himself as a convicted criminal on his way to be hanged, when he is forced to put on a tie.

Calvin the Zombie: In a series of comic strips, Calvin is supposed to be doing his homework. But, as usual, he daydreams off. Calvin puts on an obscure face, eats a PB&J messily in place of a human limb, and as he faces Hobbes, both of them begin to pretend to be zombies together. During the time of Hobbes' transformation, he uses the quote, "When in Rome", referencing to the act of doing as the Romans do. This ends when Hobbes and Calvin start laughing at each other's contorted looks, causing Calvin to remark, "Of course, real zombies never get the giggles when they look at each other."

Tiger: In one comic strip of Calvin and Hobbes, Calvin uses his transmogrifier to turn himself into a tiger, albeit retaining the short stature of his human self (Hobbes remarks "Words fail me"), though Calvin and Hobbes spend the day doing practically nothing:

Hobbes: "How does it feel to be a tiger now?"
Calvin: "Kinda fuzzy, but not that different."
Pause
Hobbes: "So... what do you want to talk about?"
Calvin: "Do we eat soon?"

Also in another comic strip, Calvin has just finished a bath, and is fed up with the world, so he resorts to turning himself into a tiger. He puts on red sleepers, a stuffed sock as a tail, and Hobbes draws whiskers on him. Then Hobbes notes that the tiger suit is missing something. So Calvin goes to get his plastic vampire fangs. The two of them then go into the woods where Hobbes is supposed to teach Calvin to be a tiger. Calvin calls Hobbes a disgrace when Hobbes says, "as long as we're going inside, lets fix some soup and sandwiches, ok?". They end up dividing the woods because the encyclopedia states that tigers are territorial by nature. Calvin decides to turn back to a boy when Hobbes reads that tigers are an endangered species.

Invisible Calvin: In numerous strips Calvin believes that he is invisible, which always ends up with him removing his clothes so he is 'untraceable.' When his clothes are not on, he is usually caught stealing cookies (which his mom doesn't allow him to eat freely).

Calvin the Giant: In one strip Calvin imagines himself as "Calvin the mighty giant", and is seen destroying the town. In the end of the strip, he asks his mom to buy him more toy cars, with her saying no, as he deliberately stepped on them.

Calvin the insect: Calvin sometimes is turned into Calvin the human Insect.

Calvin frequently finds rather odd things happening to him, such as losing his "personal gravity", becoming two-dimensional, or being morphed into a massive horsefly a la The Fly. He has also been known to suddenly either gain size or lose it, and his subsequent actions lead to humorous results. Whether these are actually happening to him or if he is merely imagining it like his other alter egos, like the nature of Hobbes, is rather ambiguous.