Broken Jaw Allosaurus The voice of reason (carnivore) in the Jurassic High senior division. Ever since he fractured his jaw as a baby, his face always looks like his chin is about to fall off. Because of his distorted expression, people around him often mistake him for being angry, but in reality, he's a hardworking guy with a weak stomach who spends every day desperately playing the straight man to his insane classmates (mostly herbivores).

Woodstock A member of the disciplinary committee (herbivore) in the Jurassic High senior division. Despite his flashy patterns, he is ultra-serious. He and Broken Jaw have a history involving a disastrous first meeting where one's jaw was crushed by the other. While Broken Jaw handles the verbal retorts, Woodstock is the "physical straight man" who strikes down insolent carnivores with his whip-like tail. They are close enough to lend each other stomach medicine.

Elvis Criolophosaurus A first-year (carnivore) in the Jurassic High senior division. A severe case of chuunibyou who refers to the crest on his head as the "Sealed Crown of the Polar Ice King." He insists that his Antarctic origin (which was just a temperate forest at the time) is a "Memory of a Fallen Angel Sleeping in Permafrost." He is the most annoying guy in school, constantly getting shut down by Joe shouting, "It's just a pompadour-shaped bone!"

Glacialisaurus (Nickname: Glacia) A first-year (herbivore) in the Jurassic High senior division. A childhood friend who grew up in the same Antarctic forest as Elvis. She is a low-energy "cynic" who always seems bored, but she delivers incredibly sharp, low-tension retorts that cut right to the core of Elvis's chuunibyou delusions. She has bad luck and frequently gets bitten by mosquitoes or falls into the mud.

Torvosaurus (Nickname: Senior Torvo) A legendary super-senior (carnivore) at Jurassic High. An absolute meathead who firmly believes that "muscles solve everything." He's the school's biggest troublemaker, doing things like buying out all the yakisoba bread in the cafeteria by force or sprinting down hallways at 40 km/h. He is the primary cause of Broken Jaw's stomach aches and the most frequent victim of Woodstock's "physical retort" (tail strike).

Rhamphorhynchus A first-year (pterosaur) in the Jurassic High senior division. The school's top troublemaker who engages in illegal flight on campus. He abuses his agility and flight to snatch meat from Joe's lunch or poke Senior Torvo's tail to enrage him. When scolded, he's a cheeky, annoying character who insists, "I'm small and cute, so I'm innocent!"

The older Guanlong twin. He and his younger brother Ron are constantly buzzing with dopamine over game glitches, energy drinks, and internet memes. Despite being an ancestor of the T-Rex, he's a super-lightweight. His catchphrases are "Right?" and "For real, lol." He lets Senior Joe's serious lectures go in one ear and out the other, dismissing them with "Yeah, yeah, okay boomer."

The younger Guanlong twin. Aside from having slightly flashier colors, he is a dopamine addict identical to his brother. He excels at speaking in perfect harmony with his brother. A fearless brat who films Woodstock's serious lectures on his phone while mocking him, saying things like "Look at this try-hard, total compliance violation, lol."

Sinraptor (Nickname: Raptor) Role: 2nd Year (Carnivore, pathetic delinquent type). He looks like a sharp, blue, delinquent-style carnivorous dinosaur, but he's a pathetic disgrace to carnivores who gets sent flying by Shurumo's hammer while she's tripping on mushrooms or gets stepped on by Salti. He admires delinquent students but is too kind to be recognized as one.

Shunosaurus (Nickname: Shurumo) Role: 1st Year (Herbivore, spacey type). A space cadet who is always seeing "hallucinations" from eating suspicious mushrooms. She is dangerous to even approach because she goes on rampages swinging a spiked hammer (her tail spikes). She has been arrested before for drug possession.