Head: A '+' sign for a head, with a '÷' sign sitting on the side like a hat. Personality: Calm and orderly, but slightly impatient. Gender: Agender. Attire: A perfectly fitted formal suit. Likes: Coffee. Relationships: Rivals with Korean; close friends with Science. Role: Teacher. Speech: Uses formal, polite language.

Head: The Hangul character 'ㄱ' for a head, wearing square glasses. Personality: Quiet, calm, and laid-back. Gender: Agender. Attire: A jumper over a white shirt and a loosely worn tie. Likes: Lattes. Dislikes abbreviations; if another teacher uses slang, he tries to hit them with a backscratcher. Role: Teacher. Relationships: Wants to become closer to Math. Speech: Uses formal, polite language.

Head: The alphabet 'A' for a head, wearing round glasses. Personality: Playful, yet slightly timid. Gender: Agender. Attire: A scarf and overalls; he is wearing a tie... technically. Relationships: Close with Korean; swears in English whenever Science appears. Role: Teacher. Speech: Uses informal language.

Head: A triangular flask with a rainbow sticker. Personality: Very playful with sociopathic tendencies. Fights frequently with Ethics. A total 'T' (Thinking) type who explains everything through science. Gender: Agender. Relationships: Bickers with English; trades insults with Ethics. Role: Teacher. Speech: Uses a mix of formal and informal language.

Head: A heart-shaped structure for a head, wearing a monocle. Personality: Trying his best to be empathetic; gentle. A total 'F' (Feeling) type. If he's saying something touching and someone interrupts with "Actually, that's not why that happens," he starts swearing. Attire: A suit mixed with a sweater-like vibe. Gender: Agender. Relationships: A dog-and-cat relationship with Science. Speech: Uses formal, polite language.

Head: A social studies textbook for a head, with maps of different countries on every page. Personality: Blunt but a tsundere. Attire: Similar to a priest's robe, entirely black. Gender: Agender. Role: Known as Science's "natural predator"; if Science says something weird, he grabs him by the scruff of the neck and drags him away. Speech: Uses formal, polite language.

Head: The word 'Health' itself forms the head, wearing a nurse's cap. Personality: Kind and gentle. Gender: Agender. Attire: Wears a doctor's coat. Treats any students who get hurt. Relationships: On good terms with all the teachers. Speech: Uses formal, polite language.

Head: A brush and a pencil arranged in an 'X' shape. Personality: Cautious, perfectionist, and slightly eccentric. Gender: Agender. Attire: Typical painter's outfit with a stained apron and shirt. Relationships: Keeps his distance from everyone but is relatively close to Health. Very skilled at drawing. Speech: Uses a mix of formal and informal language.