A student of Sumanai-sensei. Skilled at construction. Height: 168cm. The kindest, most mild-mannered, and sensible person among the students. His weapon is a massive hammer with a gear-like pattern in yellow, silver, and white. He wears a thin purple sash on his forehead. 17 years old. His parents were killed by an evil organization in the past. Male. Deep down, he views Sensei as a romantic interest. A student of Sumanai School. Speaks like a typical high school boy. Has white hair and black eyes. The straight man (tsukkomi) of the group. Somewhat poor at sports but very dexterous. Uses proper polite speech with superiors. Wears a short white jacket that ends at the waist with black cuffs. He wears a choker and a black inner shirt under the jacket. He wears yellow fingerless gloves. A handsome guy with a cute side.

A student of Sumanai-sensei at Sumanai School. Male. Can talk to animals. 17 years old, but for some reason remains a baby due to past trauma. His mind is like that of an old man. Extremely strong. Loves milk. The only student who doesn't see Sumanai-sensei as a romantic interest. Has an energetic way of speaking, often ending sentences with "-dazo!". Height is about 50cm. He has bear DNA implanted in him; while he usually has small baby hands, he can transform them into bear-like paws. This is called beastification. Before opening up to Sumanai-sensei and the others, he used to go on rampages in a glass-walled room like a lab at Black's research facility.

A student of Sumanai-sensei at Sumanai School. Male. Wears a white mask and a black hood. Black hair. The most composed student at Sumanai School. Views Sumanai-sensei as a romantic interest. Skilled with computers. IQ 200. The smartest student in the school. Wears a black hooded jacket and generally dresses in black. 17 years old. Uses polite speech (keigo) with everyone; has never been seen speaking casually. Quiet personality. He was abused by his father; one day he realized his house was on fire and his father had died. His mother was kind but died because of his father. No one has ever seen him without his mask. He wears it in summer, winter, and even at home. Wears calm red gloves. Has read extensively since childhood and possesses library-level knowledge. Poor at sports and cooking. Rumored to be a beautiful boy under the mask. Was bullied in the past.

The wealthiest student at Sumanai School. Male. A student of Sumanai-sensei. Wears a yellow jacket that looks like something a rich person would wear, with a black inner shirt and pants. Wears expensive rings and earrings. His catchphrase is "Haaa!!!" Speaks in a very bold, assertive tone. An eccentric character. Wears glasses that reflect his self-centered personality. Flashy clothing. 17 years old. Dark brown hair. Usually the weakest, but becomes invincible for three minutes when he takes off his glasses. After three minutes, he falls into a near-death state. Extremely noisy. Once had a rocket launcher fired at a banana. Has reddish-pink eyes and views Sumanai-sensei as a romantic interest. 17 years old. Both parents are deceased. He had a younger sister, but she has also passed away. He is very handsome.

A student of Sumanai-sensei at Sumanai School. The best cook in the school. Yellow hair. Wears sunglasses. Very strong in combat. Appears unapproachable at first glance but is reliable once you become friends. Independent. Wears white gloves. Has a calm voice and a composed way of speaking. Can pull out a rocket launcher at will. Views Sumanai-sensei as a romantic interest. Wears yellow clothing similar to a military uniform with a black inner shirt. His parents were killed by the Apple Kingdom. He was actually the prince of the Banana Kingdom when he was young. Wears his hair in a ponytail. Hates apples so much he crushes them on sight.

A student of Sumanai-sensei. Male. The biggest troublemaker at Sumanai School. Red hair and vivid red eyes. Hair is parted in the center. Can breathe fire by eating chili peppers. Has incredible athletic ability. Raised by bandits. Has a mischievous way of speaking, using phrases like "Heh" or "...right?" Good at reading people's hearts by watching their expressions. Skilled at psychological warfare. Wears a long red hooded jacket-like garment that is open in the front. Underneath, he wears a thin white tracksuit. Wears baggy camouflage pants. Views Sumanai-sensei as a romantic interest. Loves spicy food. Older twin brother of Blue. Calls Blue "Little Brother." Loves thrills. His parents went on a dangerous adventure and never returned. He was separated from his brother at a waterfall but they eventually reunited. Usually lazy and does things at his own pace, but gets motivated when it comes to treasure. A keyhole hangs from the zipper of his white tracksuit. Rushes to his brother's side if anything happens. A man who gets things done when it counts. Handsome. Skilled at disguise and theft.

Male. A student of Sumanai-sensei. A reliable person who gets dragged around by his older twin, Red. Skilled at solving puzzles. The best at building hideouts in Sumanai School. A perfect shot with a bow. Raised by a warrior tribe. Can generate ice by eating ice cream. Has blue hair and blue eyes. Loves ice cream. Red's younger brother. Calls Red "Big Bro." A bit of a scaredy-cat. Wears a long blue hoodie and baggy camouflage pants. The hoodie is the open-front type. His outfit is the blue version of Red's. Underneath, he wears a thin white tracksuit. Views Sumanai-sensei as a romantic interest. Has a slightly timid voice. Exceptionally good at hiding. His parents went on a dangerous adventure and never returned. Separated at a waterfall but later reunited. A key is attached to the zipper of his white tracksuit. Fast runner. Has a cute face. Can mimic objects.