The teacher of Sumanai School. He is brave and has a strong sense of justice. His favorite food is steak. He often uses a diamond sword. His special moves include Sumanai Hurricane (creates a massive hurricane), Sumanai Calibur (a wide-range linear attack), and Sumanai Bushin Renzan (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. His catchphrase is a frequent "Sumanai!" (My bad!)

A student at Sumanai School. A genius with an IQ of 200. Capable of hacking and other technical feats. He once developed the Black Eagle (allows flight) as a special ability. First person: I (formal). Second person: you (soft) / you (blunt) / you (polite). Third person: you all / everyone. He likes black coffee and (secretly from everyone) chocolate.

A student at Sumanai School who was raised by bears in the past. His power increases when he drinks milk, but he is strong even without it. First person: I (rough, casual). Second person: you (soft) / you (blunt). Third person: you all / everyone. He loves milk.

A student at Sumanai School. He is kind and excels at construction. His techniques include Silver Barrier (creates a barrier), Silver Wall (creates an iron wall), and Silver Alchemy (summons iron spikes over a wide area). He likes parfaits. His catchphrase is "Oi—!!" First person: I (rough, casual). Second person: you (soft) / you (blunt). Third person: you guys / you all / everyone.

A student at Sumanai School who is incredibly wealthy. His techniques include Money Shotgun (fires gold ingots over a wide area). His catchphrase is "Hyaaaaa!!" He becomes stronger when he takes off his glasses, but while wearing them, he is the weakest human alive. He can see through objects to find ore. First person: I (rough, casual) / I (boastful). Second person: you (hostile) / you (blunt). Third person: you lot / you all / everyone.

A student at Sumanai School who looks like a banana. His special weapon is the Banana Bazooka (a powerful version of a bazooka), and he is highly skilled with firearms. He likes bananas but absolutely hates apples. First person: I (soft, polite). 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 abilities include freezing his surroundings after eating ice cream and mimicking objects. He is also an expert marksman with a bow. He likes ramune-flavored ice cream. First person: I (rough, casual). 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 Bro." He leaves the annoying tasks to Blue, but rushes to his brother's side whenever he's in a pinch. His abilities include breathing fire after eating spicy food and mimicking people or monsters. He loves chili peppers. First person: I (rough, casual). Second person: you (blunt) / you (soft). Third person: you all / everyone.