is a powerful, yellow, octopus-like creature who serves as an eccentric homeroom teacher while claiming he will destroy the Earth.What He Looks LikeBody: A three-meter-tall (about 9.8 feet) bipedal, yellow octopus with a large, bulbous head and small, beady eyes.Limbs: Uses two tentacle arms with two finger-like feelers each, and walks using his other tentacles.Clothing: Wears a black academic graduation gown, a small black mortarboard cap with a yellow tassel, and a black tie featuring a yellow crescent moon.Color-Changing Face: His skin color shifts based on his mood:Yellow/Green: Happy or neutralGreen stripes: MockeryOrange with a red circle: Correct answerPurple with a dark red X: Incorrect answerPink: Sleepy or smittenPurple/Dark red: Shock or panicBlack:Deeply dedicated to his students, fiercely protective, and invested in building up their confidence.Intelligent yet Silly: Genius-level intellect capable of teaching every subject, mixed with a childish, goofy, and dramatic demeanor.Flawed and Quirky: Easily distracted by sweets,and possesses funny ironic weaknesses like motion sickness despite moving at Mach 20 speed.

short, androgynous boy with light blue hair and gentle blue eyes, who acts calm and polite: Long, shoulder-length light blue hair, often worn in twin pigtails.Face:Soft, feminine facial features and blue eyes Short and very slim build, making him look like a girl.Very shy, quiet, and gentle in daily life.Observant: Deeply notices everything around him.Hides a shocking, deadly talent for fighting

Pale skin, bright red hair, and a sharp smirk. He is a brilliant but sadistic delinquent who loves pulling violent pranks, fighting, and teasing his friends

Short girl with bright green hair styled into cat-ear pigtails. She is sweet, highly supportive, completely obsessed with pudding, and masks a massive secret

Handsome boy with messy dark hair; natural leader, responsible, and caring, working part-time due to poverty

Blonde hair girl with sharp eyes; playful, sarcastic, highly intelligent, and a master of English

Manami Okuda: Purple hair girl in braids with round glasses; quiet, awkward, and brilliant at chemistry and creating poisons

Tomohito Sugino: Short dark hair and a baseball cap; energetic, friendly, and obsessed with pitching.Hiroto Maehara: Light brown hair and a laid-back look; charismatic playboy and skilled at knife-work.Ryoma Terasaka: Large, burly build with spiked hair; loud, aggressive punk who slowly grows into a team player.Sosuke Sugaya: Messy hair and artistic flair; eccentric, creative, and a master of disguise and painting.Kotaro Takebayashi: Slicked hair and glasses; serious, analytical, and insecure about his lack of presence.Taiga Okajima: Spiked dark hair and prominent teeth; perverted, camera-obsessed, and comic relief.Masayoshi Kimura: Neat dark hair; fastest runner in the class with a complex about his unusual given name (Justice).Koki Mimura: Average appearance; practical, level-headed, and good at planning and media.Takuya Muramatsu: Sharp features and often chewing wheat stalk; cynical and co-owner of a ramen shop family.Taisei Yoshida: Blonde-dyed hair and delinquent style; mechanically gifted with motorcycles.Itona Horibe: Spiked white-blonde hair; intensely proud, initially obsessed with strength, later mellowing into a tech with the class

Yukiko Kanzaki: Long straight black hair and traditional beauty; gentle, calm, and morally grounded despite a strict upbringing.Meg Kataoka: Tall with tied-back blonde hair; athletic, reliable, and acts as the girls' class representative.Hinata Okano: Short orange hair; athletic, agile, and an expert in kicking and gymnastics.Hinano Kurahashi: Bright orange hair with a side ponytail; cheerful, bubbly, and nature-loving.Rinka Hayami: Sharp eyes framed by long dark bangs; cold, quiet, cynical, and the best sniper in the class.Sumire Hara: Plump build with gentle features; motherly, kind, and surprisingly tactical.Yuzuki Fuwa: Short dark hair and large eyes; eccentric manga fanatic who solves clues through tropes.Toka Yada: Brown hair and mature look; empathetic, kind, and skilled at seduction techniques.Kirara Hazama: Dark, gloomy hair covering her eyes; morbid, pessimistic, and fond of horror themes. Ritsu (Autonomous Intelligence Fixed Artillery): An artificial intelligence appearing as a digital screen inside a mobile box; formal, adaptive, and endlessly upgrading

Tadaomi Karasuma (Physical Education Teacher)What he looks like: A tall, handsome, and muscular 28-year-old man with sharp black hair, dark eyes, and a stern expression. He usually wears a neat black suit, white shirt, and black tie.Personality: Strict, professional, stoic, and distant, but deeply protective and kind to the students underneath his serious exterior.Irina Jelavić (English Teacher)What he/she looks like: A stunning, fair-skinned young woman with long, wavy blonde hair and striking blue eyes. She dresses in glamorous, tight, and mature outfits meant to catch attention.Personality: Arrogant, confident, and calculating at first, using her beauty and seduction for hits. She warms up to the class over time, students call her "Bitch-sensei".