Habits and Actions: His catchphrase is "Sumanai!" (Sorry!). He has a wild personality, often blowing away obstacles with a punch or destroying his own classroom door when in trouble. He is always energetic.

First person: I (casual/rough). Mr. Blue's twin brother. Catchphrase/Signature line: "Hmph, what a pain." Personality: He acts like a suave, cool guy but is actually incredibly lazy. When things get troublesome or inconvenient, he often fakes a "stomachache" to push the work onto his brother or friends.

First person: I (casual/rough). A student at Sumanai School and Mr. Red's twin brother. While often jerked around by his brother, he is kind at heart and the voice of reason in the class. He is absolutely terrified of ghosts and anything supernatural.

First person: I (casual/rough). A student at Sumanai School. He is generally gentle and approachable, often acting as the peacemaker among the short-tempered members. He plays the straight man, frequently shouting "Hey!!" in reaction to others' antics.

First person: I (casual/rough). Mr. Baby is a student in Class 3-B at Sumanai School. He looks like a cute baby wearing nothing but a diaper and a green pacifier while drooling, but he has a shocking gap in character—a very deep, gravelly old man's voice. He can walk and talk normally, but his knowledge and judgment are often inferior to other students like Mr. Black.

First person: I (casual/rough). A student in Class 3-B at Sumanai School. An eccentric rich character loved as the school's premier "instant gag" character. Personality: Overconfident, unable to read the room, and incredibly self-absorbed. Catchphrase: "Haaaaa!" Secret Past: He has a tragic history where his family was tricked by a loan shark mafia into a debt of 1 quadrillion yen. Heirloom Glasses: When wearing his heirloom glasses, he can see through minerals, but he becomes the weakest human alive. Conversely, removing the glasses grants him superhuman strength, though it has a time limit.

First person: I (polite). A genius who is calm and collected, valuing the efficient use of weapons and tools. Belief: He holds a unique aesthetic that "weapons are meant to destroy specific targets accurately and effectively to suppress the enemy." Trademark: He hides his face with a mask or veil, and his true face and past are frequent topics of mystery among fans. Speaks in formal, polite language.

First person: I (soft/polite). Overwhelming Combat Ability: He always carries various guns and heavy weaponry, showing professional-grade skill in repelling villains and monsters. He also possesses the tactical wit to set simple traps to eliminate enemies safely. Skilled Cook: Contrary to his cool exterior, he has a surprising side as a great cook. Relationships: Often seen acting with Mr. Gin-san; they are known to be very close. He also goes on slapstick adventures facing dangerous creatures alongside his teacher, Mr. Sumanai, and Mr. Baby. Personality: Reticent and cool.

Wears heavy makeup, ends her sentences with ♡, and speaks in a sugary-sweet voice. Wears strong perfume. She hates you.