The cast of principal, recurring characters in
Calvin and Hobbes is limited; for example, in the
Yukon Ho! collection, only five regular characters appear. Other characters who make infrequent or one-off appearances include the following. •
Living food: Calvin often imagines that an oatmeal-like food comes to life, sometimes attacking him (or, in one case, reciting Hamlet's "
To be, or not to be" soliloquy). Bill Watterson has said that his inspiration for this came from a cartoon drawn by himself in childhood, which featured living oatmeal, plus his own admitted "fussy eating habits" from when he was a child. •
Extraterrestrial life forms: Calvin encounters many
extraterrestrial life-forms in the course of the strip, usually during adventures as his alter-ego, Spaceman Spiff. Most of these aliens are non-humanoid, bizarre monsters, but represent Calvin's imaginative perception of Susie, his parents, and teachers. During the story which gave the name to the
Weirdos from Another Planet! collection, Calvin and Hobbes encounter a native Martian, who is a small creature with tentacles and eye-stalks. In the strip's final year, Watterson drew two stories involving recurring alien characters,
Galaxoid and
Nebular, to whom Calvin "sold" the Earth for 50 alien leaves to use for his science project, which he failed when his teacher rejected the leaves' origin. The donors returned in the final two weeks of strips, angry at Calvin for failing to reveal the changing seasons. When Hobbes suggests to Calvin that he returns the 50 leaves to them, Calvin angrily admits he threw them away because he got such a bad grade; both were placated when Hobbes clad them in Christmas stockings. •
Doctor: Calvin occasionally visits his
pediatrician, who appears to be a mild-mannered physician with a friendly demeanor. Calvin, however, sees him as a vicious, sadistic interrogator, sometimes imagining him as an alien or overreacting to playful diagnoses. The doctor made his final appearance when he diagnosed Calvin with
chicken pox. •
Barber: Calvin once goes to a barber named Pete, and barbers are mentioned throughout the series, including one named Charlie. •
Principal Spittle: Calvin's school principal usually makes his appearance when Calvin has upset Miss Wormwood; typically, he is seen looking over his desk as Calvin tries to explain his latest mishap, with an apathetic or infuriated expression in his face. He is seldom shown speaking except in his first appearance. He is depicted thinking to himself that he hates his job. •
Mr. Lockjaw: Mr. Lockjaw is the gym teacher and coach of the baseball team at Calvin's school. He is a squat, burly man with little patience, and no sympathy for Calvin whenever Moe gets violent with him in gym class, with Calvin commenting that Lockjaw thinks "violence is aerobic." He does not stop Calvin's baseball teammates from abusing and teasing him, and when Calvin leaves the team, Lockjaw calls him a "quitter". This emotional trauma leads Calvin to create
Calvinball, supposedly the least organized sport. •
Scouts: Early in the strip,
Watterson shows Calvin participating with other children in
Cub Scout activities in the woods. Watterson thought at the time that Scouting might offer some potential for interesting adventures, but eventually abandoned the idea, considering it uncharacteristic of Calvin to join an organization. • '''Susie's mom''': She is shown from the waist down in a foiled attempt to pester Susie, and is also seen having a brief dialogue during Susie's first experience with Calvin's alter-ego, Stupendous Man. •
Substitute teachers: Occasionally, Calvin's class will have a substitute teacher. Only one,
Mr. Kneecapper, was named; Calvin tricked Susie into believing that Mr. Kneecapper cooked rowdy students into the cafeteria meatloaf. In one set of strips, an unnamed woman is substituting; she looks through some notes Miss Wormwood left and inquires which child Calvin is. Later, Hobbes asks Calvin what he thought of her, Calvin replies he is unsure as "she went home at noon." •
The monsters under the bed: the primary villains of the comic strip, along with Moe: a diverse set of bizarre-looking
photophobic creatures, who live under Calvin's bed and periodically plan to eat Calvin, but are outwitted by him on each occasion. Only two of the monsters have names; one is
Maurice, and another
Winslow. Another monster from the comic-poem
A Nauseous Nocturne comes to eat Calvin, only to be deterred by Hobbes. This shows that the monsters are more than a little afraid of Calvin's best buddy, a reference to the fact that sleeping with a stuffed animal can relief stress and reduce nightmares. • '''Calvin's bicycle''': A supporting villain, it will frequently chase (and even sometimes run over) Calvin, destroying household items or injuring Calvin himself. •
Other students: Calvin's classmates, like his teacher, are assumed to be the same every year as no time appears to pass in the comic strip. Some of the students who do have names are -
Tommy Chestnutt, whom Calvin claims Hobbes ate when he made fun of him,
Filthy Rich, who Calvin claims some bullies got by grabbing him at the drinking fountain,
Candace, who has the desk nearest Susie,
Ronald, whom Calvin uses as the butt of his "invisible Cretinizer" joke,
Jessica, whom in one story arc Susie passes gossip notes to via Calvin, and another student named
Tommy whom Calvin claims had milk go up his nose while telling a funny story. Most of these are only mentioned by name in conversation. Apart from Candace and Ronald, those who do physically appear in the strip remain unnamed. This includes Calvin's baseball teammates, who bully him off the team after he makes a rookie mistake, and kids on the playground who usually are antagonistic to Calvin as well. ==References==