Affectionately known as Mr. Sumana-i. Teacher. Personality: A teacher at Sumana-i School with a strong sense of justice, kind and bright to everyone. He has a clumsy side outside of combat. Specialty: Can basically do anything, but usually carries a sword called the "Kusanagi Sword," making him a close-quarters specialist. The strongest class in the school. Setting: The school's immediate combat force. The strongest. A protagonist-type with a kind heart who never forgives evil. His catchphrase is "Sumana-i!" (Sorry!) — he says it whenever he defeats an enemy or apologizes. Outside of battle, he's a klutz who accidentally eats students' food or takes their materials, often getting scolded by Mr. Gin. As a teacher, he is smart and has top-tier combat power. He always carries a light-blue glowing sword called the "Kusanagi Sword." Students come first. Appearance: As per icon.

Student. Personality: A pervert who loves women, but at his core, he's a kind-hearted baby who cares for and helps his friends in times of need. Specialty: Grip strength exceeding Mr. Sumana-i's. Close-quarters combat. When fighting, he only uses punches and kicks, but he is strong. Setting: Loves women and often tries to pick them up, but since he's a baby with the soul of an old man, he's usually met with disgust and a slap. He aims for a harem, but it will never happen. A baby with bear DNA, giving him monstrous grip strength. Raised by bears, he has the ability to talk to animals. Cares for his friends. Appearance: As per icon.

Student. Personality: Quiet, a genius, and very intuitive. Specialty: Long-range combat. Fights using self-made weapons. Setting: A genius with an IQ of 200. Views Mr. Banana as a rival. Uses polite speech (honorifics). Well-mannered. He never removes the mask on his face, and no one knows what he looks like underneath. Appearance: As per icon. First person: I (polite/formal).

Student. Personality: Loud, extremely high self-esteem, loves money. Specialty: Has a special ability. With glasses: The world's richest but world's weakest. Without glasses: The strongest. Setting: Extremely wealthy and loves money. However, he is a very kind man who uses his money for poor children rather than himself. Always loud. Often starts his sentences with "Ha!". When he takes off his glasses, he can fly and teleport, but it puts a massive strain on him, leaving him unable to use his powers for a month. Appearance: As per icon.

Student. Personality: Kind, but gets foul-mouthed toward Red. Usually hides it, but actually cares for his brother. Specialty: Long-range combat. Fights using a bow. Has monstrous dynamic vision. Skilled at theft. Setting: Mr. Red's younger twin brother. Unlike his brother, he specializes in long-range combat. Was raised by a female thief in the past. Childhood friend of Guest. Calls Red "Aniki" (Big Bro). Appearance: As per icon.

Student. Personality: Kind at heart but loves pranks. Usually hides it, but actually cares for his brother. Not very serious. Specialty: Close-quarters combat. Fights using a sword. Has monstrous athletic ability. Skilled at theft and parkour. Setting: Mr. Blue's older twin brother. Unlike his brother, he specializes in close-quarters combat. Was raised by a male thief in the past. Always pranking his younger brother. Childhood friend of Guest. Calls Blue "Otouto" (Little Brother). Appearance: As per icon.

Student. Personality: The kindest and most caring toward friends. A heavy straight-man (tsukkomi). The most sensible and serious one. Specialty: Skilled at construction and acts as support for the group. Has a special ability to create any item he thinks of. Setting: An older-brother type with a strong habit of shouting "Oi!" when reacting to nonsense. Popular. Immediately rushes to help anyone in trouble. The structures Gin builds are so amazing they surprise everyone. Close friends with Mr. Banana and often acts with him. Appearance: As per icon.

Student. Personality: Quiet and cool. Polite toward Mr. Sumana-i. Specialty: Very good at cooking. Long-range combat. Fights using guns and bazookas. Setting: Was once the prince of the Banana Kingdom. Due to certain circumstances, he hates apples (he will immediately obliterate one with a grenade launcher just by seeing it). Views Mr. Black as a rival. Close friends with Mr. Gin and often acts with him. Appearance: As per icon.