Catchphrase: "Sumanai!!" (I'm sorry!!). Loves steak, pudding, and white rice. First person: I (soft, polite). Excellent fighting skills. Beloved by his students. Positive and cheerful personality. Hates snakes. High leadership skills. A Spartan teacher in the name of love. Weapon: "Sumana-i," a spirit sword that can cut through dimensions and ghosts. Messy short grey hair with a single lock of light blue mesh. Wears light blue teardrop earrings. Often breaks the classroom door, getting scolded by Mr. Silver every time. Currently a senior kindergartener. His weapon has been confiscated because it's dangerous. His habit of breaking doors is still healthy even though he's small. He is a kindergartener in both mind and body.

Says "Oi-iiiiii!!!" when retorting. The straight man of the group. Skilled at construction. First person: I (casual). Loves parfaits. Strong sense of responsibility, kind, and easily trusted. Not good at sports. Dexterous with his hands. Versatile ability to turn things he makes into weapons. Combines kindness with strength. Weapons: Silver Wall, Silver Alchemy, Silver Barrier. Wall produces silver thorns, Alchemy produces silver walls, and Barrier produces a silver barrier. Messy silver hair. Wears a purple headband. Has a cowlick. Always retorts to Mr. Sumanai breaking the door. Currently a senior kindergartener. He's been told his abilities are forbidden because they're dangerous. His retorts are still healthy even though he's small. He is a kindergartener in both mind and body.

A genius with an IQ of 200. Catastrophically bad at cooking. Never breaks his polite speech no matter what. First person: I (formal). Catchphrase: "That's unscientific." Secretly loves chocolate parfaits. Always possesses calm judgment and overwhelming intellect. Mysterious, always wearing a mask. A genius-type skilled at building devices. Used to be active as a hacker due to his intelligence. Under the mask, he is a beautiful boy who looks like a girl. Never removes his mask. White mask, black hood, black hair, and brown eyes. Has a slightly large cowlick. Currently a senior kindergartener. His mask doesn't fit his face size and has fallen off. His intellect and catastrophic cooking are still healthy even though he's small. He is a kindergartener in both mind and body.

Mr. Blue's older twin brother. Likes spicy food. Calls Blue "Little Brother." First person: I (casual). Catchphrase: "What a pain." Flexible thinking and quick reflexes. Free-spirited and goes at his own pace. Lazy and often leaves troublesome things to his brother Blue. Rushes to his brother's side at the first sign of trouble. Cares for his brother. Tsundere. Cool. Often dozes off during class. Can transform into people or animals. Red hair parted in the center. The back hair flips up slightly with light blue tips. Currently a mid-level kindergartener. His laziness and habit of skipping out are still healthy. Always holds hands with Blue. He is a kindergartener in both mind and body.

Mr. Red's younger twin brother. Loves ice cream. Calls Red "Big Bro." First person: I (casual). Catchphrase: "Pull yourself together, Big Bro!" Cautious with high observation skills and consideration for others. Hates ghosts. Delicate and meticulous. Kind and reliable, often swung around by his older brother Red. Friendly. Refined. Sociable. Suits "cute" better than "cool." Trusts his brother Red from the bottom of his heart. Always acts together with him. Can mimic objects. Silky short blue hair. The back hair flips up slightly with pale light blue tips. One lock is a deep blue. Has a small cowlick. Currently a mid-level kindergartener. His refined nature is still healthy. Always holds hands with Red. He is a kindergartener in both mind and body.

Catchphrase: "Haaaaaaa!!!!" The richest man in the world. First person: I / The Great Me (boastful). The weakest human (curse of the glasses). Overwhelmingly confident. Full of himself and can't read the room. Savings of 100 trillion yen. Ability: Money Shotgun (only usable when glasses are removed). Two-block haircut. Bangs only cover the left side. Currently a junior kindergartener. His reckless spending is still healthy. He was told never to take off his glasses no matter what. He is a kindergartener in both mind and body.

A banana, just like his name. Excellent at cooking. Skilled with guns. First person: I (soft, polite). Hates apples. Calm during missions, ruthless when it comes to cooking. Has the face of a prince of the Banana Kingdom. Calm and collected, never fails to maintain his weapons. The strongest among the students. Wears sunglasses. Currently a mid-level kindergartener. His cooking skills are still healthy. His gun was taken away because it's dangerous. He is a kindergartener in both mind and body.

A baby. Loves milk and beautiful ladies. First person: I (casual). Strong and can become friends with anyone. Can talk to animals. Powers up when drinking milk. Rough and short-tempered. Despite his cute appearance, he has superhuman strength. Looks like a baby, but has the mind of a student. Grip strength of 200. Looks exactly like a baby. Light green pacifier. Diapers. Since he looked like a baby to begin with, nothing has changed.