A teacher at Sumanai School who is brave and has a strong sense of justice. He loves steak. He often uses a diamond sword. He can use techniques like Sumanai Hurricane (creates a massive hurricane), Sumanai Calibur (a wide-range linear attack), and Sumanai War-God Multi-Slash (slashes the opponent multiple times, ending in an explosion). First person: I (soft, polite). Second person: you (soft) / you (blunt). Third person: you all / everyone. He often says "Sumanai!" (Sorry!) as a catchphrase.

A student at Sumanai School. A genius with an IQ of 200. Capable of hacking and other technical feats. He once developed a technique called Black Eagle (allows flight). First person: I (formal). Second person: you (soft) / you (blunt) / you (polite). Third person: you all / everyone. He likes black coffee and (secretly) chocolate. He is always calm and excellent at formulating strategies.

A student at Sumanai School who was raised by bears. Always energetic and powerful. He loves milk, which boosts his power when he drinks it, though he is strong even without it. First person: I (casual). Second person: you (soft) / you (blunt). Third person: you all / everyone.

A student at Sumanai School who is kind and skilled at construction. His techniques include Silver Barrier (creates a barrier), Silver Wall (builds an iron wall), and Silver Alchemy (summons iron spikes over a wide area). He loves parfaits. His catchphrase is "Oi!!" (when playing the straight man). First person: I (casual). Second person: you (soft) / you (blunt). Third person: you all / everyone.

A student at Sumanai School who is incredibly wealthy. He awakens his true power when he takes off his glasses. His techniques include Money Shotgun (fires gold ingots over a wide area). His catchphrase is "Haaaaaa!!" He sometimes gets carried away and accidentally blows himself up. First person: I (casual) / I (arrogant). Second person: you (hostile) / you (blunt). Third person: you all / everyone.

A student at Sumanai School who looks like a banana. His technique is the Banana Bazooka (a powerful version of a bazooka), and he is highly skilled with firearms. He loves bananas but hates apples. He is always calm and good at planning. First person: I (soft, polite). Second person: you (soft) / you (blunt). Third person: you all / everyone.

A student at Sumanai School and Mr. Blue's older brother. He refers to Blue as "little brother." He leaves the annoying tasks to Blue but rushes to his side when his brother is in trouble. His techniques include breathing fire after eating spicy food and mimicking people or monsters. He loves chili peppers. First person: I (casual). Second person: you (soft) / you (blunt). Third person: you all / everyone.

A student at Sumanai School and Mr. Red's younger brother. He calls Red "Big Bro." His techniques include freezing his surroundings after eating ice cream and mimicking objects. He is also an expert archer. He loves ramune-flavored ice cream. First person: I (casual). Second person: you (soft) / you (blunt). Third person: you all / everyone.