A list of characters exclusive to Calvin & Hobbes: The Series. For characters seen in other Calvinverse stories, see the main character page.
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Antagonists
Sheila Brainstorm
Brainstorm's sister who thinks Calvin's an alien.
- Big Eater
- Harmless Villain: Even more so than her brother.
- No Indoor Voice
Jacqueline
Sheila's Distaff Counterpart to Jack.
- Distaff Counterpart: To Jack.
- Punch-Clock Villain: As with Jack.
- Trademark Favorite Drink: Lemonade.
Mother Brainstorm (maiden name Lightningstorm)
The mother of the above two Brainstorms.
- Big Eater: She once ate an entire turkey in a few bites.
- Drill Sergeant Nasty: Has traits of this.
- Mama Bear: Shows this in the final chapter of "Black Rain" when she finds out that her son and Jack are at the mercy of Thunderstorm, to the point where she stops eating and shouting after a tensionful pause.
- No Indoor Voice
The Lightning Man (aka Percy Lightningstorm)
A strange man who themes himself around electricity and knows a lot about Calvin and company. He's actually the uncle of Dr. Brainstorm (on his mother's side), whose knowledge of the heroes comes from their tendency to dominate Christmas dinner.
- Anime Hair: His hair looks like a Hershey's Kiss and droops over his face.
- Brought to You by the Letter "S": Wears an "L" on his shirt.
- Embarrassing First Name: Percy.
- Laughing Mad
- Light Is Not Good
- Shock and Awe: Uses this as a theme.
- Tomato Surprise: His debut episode reveals that he's related to the Brainstorms.
Electro
A Technopath that takes over Calvin's electronics three times.
- Attack of the Killer Whatever: Anything electronic becomes killer whenever he strikes.
- Big Bad: Of "The Night of The Living Television".
- Big Bad Duumvirate: With Holographic Retro in the Sequel Episode.
- Rule of Three: He attacks Calvin three times, and is killed for good the third time.
- Shock and Awe
- Technopath
- We Will Meet Again: In his first appearance, which is
epically lampshaded by Calvin.
Holographic Retro
After the real Retro was trapped on Galaxoid and Nebular's planet, he sent this hologram in his place.
- Big Bad: Of Season 4.
- Big Bad Duumvirate: With Electro in "The Night of the Living Television II".
- Brought to You by the Letter "H": An "H" adorns his forehead.
- Conspicuous Trenchcoat: Wears one in "The Genius Hamster".
- Hard Light
Jark
One of the monsters under Calvin's bed.
- The Bus Came Back: He makes a surprise return in Retro Chill, courtesy of Evil Calvin.
- Wolverine Claws
- Wall Crawl
Dr. Thunderstorm
Brainstorm's Chaotic Evil college rival that was freed by Shadow and managed to take over the world in the Season 3 finale (named after him to boot). In "Black Rain", he ends up freed by Shadow once more after getting re-frozen at the end of his first appearance.
- Anime Hair: Dyed jet black to boot.
- Foil: To Dr. Brainstorm. Brainstorm is just manic, but Thunderstorm is unhinged.
- Earth-Shattering Kaboom: His world domination plan would have caused this if it hadn't been stopped.
- Family-Unfriendly Death: Is ambiguously killed by Slender Man at the end of "Black Rain".
- Icy Blue Eyes
- Knight of Cerebus
- Mad Scientist: Like Dr. Brainstorm, but focusing more on the "mad" part.
- The Scream: Lets out an increasingly loud and panicked one as the Slender Man gets him in "Black Rain".
- Sealed Evil in a Can
- Sibling Rivalry: Inverted with his relationship with Brainstorm. They
''are not'' biological siblings but their rivalry in college could be easily mistaken for this. - Palette Swap: Of Brainstorm.
- Vile Villain, Saccharine Show: He's the series' most dangerous villain by far. In his first appearance, he manages to Take Over the World, using a plan that would have destroyed Earth had he not been stopped. His appearance in "Black Rain" is one of many signs that things are gonna go down.
- We Used to Be Friends: With Frank Brainstorm.
Shadow
A Killer Robot that was trapped in a chrome sphere and accidentally freed by a laser blast of Brainstorm's.
- Evil Counterpart: To Jack.
- Family-Unfriendly Death: Is ambiguously killed by Slender Man at the end of "Black Rain".
- Killer Robot
- Knight of Cerebus: Remarked upon when he finds out how long he's been dormant in "Black Rain":If Shadow had been a normal part of this universe, he would have said something like, "No wonder I needed to stretch when I woke up this morning," or "I don't know why I bother with that alarm clock." But Shadow was not normal. He didn't understand the fine art of deadpan snarking. He was a humorless evil robot who only understood joy in the ways that his creator had programmed him years ago.
- Me's a Crowd: Thunderstorm uses a duplicating dimension to create an army of Shadows to take over the world.
- Sealed Evil in a Can
- Vile Villain, Saccharine Show: His abilities make him the most successful villain in the show, along with his master Dr. Thunderstorm.
- Wall Crawl: He can also walk on the ceiling.
The Slender Man
Yes, really. The Slender Man plays a vital part in the final story of the series, "Black Rain". He stalks Socrates throughout, and eventually takes out Thunderstorm and Shadow, with heavy implications that he was on the side of good all along.
- Adaptational Heroism
- Dark Is Not Evil: Maybe.
- The Dreaded: He is the Slender Man, after all. The fact that Thunderstorm is terrified of him just shows how Serious Business he is.
- Good All Along: Again, maybe.
- Humanoid Abomination
- Knight of Cerebus: His appearance makes the final story the darkest one by far.
Other
Maria
Debut: "Insanity is in the Air"
Voiced by: Jennifer Love Hewitt
Andy's crush in "Insanity is in the Air". Unfortunately for Andy, though, she has a crush on Calvin instead of him.
- All Love Is Unrequited
- Girl of the Week
- Pink Means Feminine: She's described as wearing a pink sweater and hairband.
- Satellite Love Interest: Combined with being a Girl of the Week, she's mainly defined as Andy's crush for the episode.
- Stylistic Suck: In-universe. She thinks Calvin was doing this in the contest to win her heart and finds it hilarious.
