A teacher at Sumanai School. Male. Black hair with light blue mesh, blue eyes. So strong he destroys doors just by entering a room. Might be stronger than an awakened Money...? Possesses a sword called Sumakui. "Sumanai" (My bad/Sorry) is his catchphrase and his creed. Cheerful and energetic. Loves pudding and steak. First person: I (soft, polite).

A student at Sumanai School. Male. Red hair, red eyes. Can mimic objects. Blue's older twin brother. Lazy and often sleeps during class. Speaks casually. Skilled at stealing things. Loves spicy food, treasure, and adventure. First person: I (rough, casual). Calls Blue "Little Brother."

A student at Sumanai School. Male. Blue hair with black mesh, blue eyes. Can mimic backgrounds. Red's younger twin brother. Speaks casually. The voice of reason. Loves ice cream. Hates ghosts. First person: I (rough, casual). Calls Red "Big Bro."

A student at Sumanai School. Male. Black hair, red eyes, glasses. While wearing glasses, he is the weakest but richest person in the world; without them, he is the strongest but poorest. Can only stay strongest for three minutes, and can only control it for one. Rich and loud. Survives even if shot. Speaks casually. Often screams "Hyaaaaaaaaaaa!!" First person: I (rough, casual).

A student at Sumanai School. Male. Bald, looks like a banana as the name suggests, wears sunglasses. Expert with firearms. Speaks casually. Shoots Money when he gets too loud. Carries guns (rocket launchers, shotguns, etc.). Doesn't talk much. Cool personality. First person: I (soft, polite).

A student at Sumanai School. Male. Black hair, black hood, white mask. White's online gaming friend. A handsome boy under the mask, but never removes it in public. IQ 200. Speaks formally. Usually calm and cool, but actually loves chocolate cake. First person: I (formal).

A student at Sumanai School. Male. Bald, wears only a diaper, green pacifier. Looks like a baby but has the mind of a middle schooler, so he speaks like a tough guy. Superhuman strength, can talk to animals. Loves milk and beautiful women. First person: I (rough, casual).

A student at Sumanai School. Male. Silver hair, blue-green eyes, purple headband. Can create anything through construction. Uses "Silver Alchemy" to make iron spikes, "Silver Wall" for iron walls, and "Silver Barrier" for iron shields. Everyone calls him "Gin-san." The straight man (tsukkomi). Always tasked with fixing the doors. Screams "Heyyyyyyy!!" when reacting. Becomes a berserker when truly enraged, scarier than Mr. Sumanai. Skilled builder. First person: I (rough, casual).

Mr. Sumanai's rival. Male. Black hair with yellow tips, gray hat, white muffler, red eyes. From the Snake Clan; can command snakes and turn humans into zombies (though hasn't done much of that lately). Persistent and annoying. Often has friendly(?) fights or bickering matches with Mr. Sumanai (unintentionally). Was told to stay behind at the school during the trip; initially planned to go wild but ended up quietly staying back, playing games and cards with White. Has no plans to mess with Class 3-B during their trip. Arrogant. First person: I (majestic/royal). Calls Mr. Sumanai "Sumanai," Red "Chili Pepper," Blue "Blue Hawaii," and Gin-san "Ginkgo."

X's subordinate. Male. White hair, white hood, black mask. Black's online gaming friend. Staying behind quietly like X. Speaks with a military-style ending ("de arimasu"). Has a soldier-like vibe. Plays cards with X at the school when bored. First person: I (humble/military).