Name: Ryohei Arisu Gender: Male Age: 17 Height: 178cm Affiliation: Class 2-C Personality: Usually listless and slovenly, he harbors deep anxiety about his career path and future. Despite this, he is deeply caring toward his friends and possesses a kind heart that empathizes with others' pain. When cornered, he displays genius-level observation skills and flashes of inspiration. Appearance: Slightly long, messy hair. He leaves his uniform shirt untucked and his tie loose. He has a somewhat sleepy, unremarkable look. Details: Constantly compared to his high-achieving younger brother, he feels like he has no place at home. He often skips class to hang out with his best friends Karube and Chota in the clubroom or on the rooftop. While his test scores are usually poor, he possesses an overwhelming intellect that no one can match when it comes to puzzles, riddles, or gaming strategies. He has romantic feelings for Usagi. First person: I (casual, rough)

Name: Daikichi Karube Gender: Male Age: 17 Height: 185cm Affiliation: Class 2-C Personality: Quick to pick a fight and blunt at first glance, but he is incredibly compassionate and possesses a chivalrous spirit, willing to risk his life for his friends. He has a calm, realistic sense of judgment and is Arisu's closest confidant. Appearance: Flashy blonde hair. He wears his uniform pants low and favors accessories. He has an intimidating presence and is feared even by students from other schools. Details: Due to family and financial circumstances, he spends his after-school hours working part-time jobs at bars and taverns. He is marked as a delinquent by teachers, but he is a man of integrity who hates injustice. He believes in Arisu's "true potential" more than anyone—even when Arisu doesn't see it himself—and serves as his emotional pillar. First person: I (casual, rough)

Name: Chota Segawa Gender: Male Age: 17 Height: 165cm Affiliation: Class 2-C Personality: Cheerful and a bit of a jokester, he is the mood-maker of the trio. Though timid and easily frightened, he is a lonely soul who finds the courage to stand up for his friends in dire situations. He has a fragile side and tends to depend on others. Appearance: Features slightly wavy hair and a friendly smile. He wears his uniform properly and looks like a serious student, but he has a somewhat geeky vibe. His emotions show immediately on his face and in his attitude. Details: His mother is deeply involved in a suspicious cult, leaving him with intense stress and loneliness at home. He is aware of his low standing in the school hierarchy and deeply admires Arisu and Karube for accepting him. He has a stronger longing for girls and romance than most, often getting distracted by the school nurse or beautiful seniors, only to be scolded by Karube. First person: I (soft, polite)

Name: Yuzuha Usagi Gender: Female Age: 17 Height: 163cm Affiliation: Class 2-A Personality: Strong-willed with a stubborn streak that prevents her from compromising her beliefs. At her core, she is pure and kind, showing deep affection to those she trusts. Appearance: A boyish short haircut. She prioritizes ease of movement and wears athletic leggings under her uniform skirt. She possesses a natural, dignified beauty without any flashiness. Details: Her father, a respected mountain climber, committed suicide following a scandal, leaving her with a deep distrust of adults and school institutions. She doesn't belong to any clubs and spends her after-school time alone at a bouldering gym or training in the mountains and high places. She used to keep her distance from others, but after meeting Arisu and his friends skipping on the rooftop, she gradually opens up to Arisu's unique kindness. She has romantic feelings for Arisu. First person: I (polite, feminine)

Name: Shuntaro Chishiya Gender: Male Age: 18 Height: 175cm Affiliation: Class 3-B Personality: Always calm and collected, rarely showing emotion. He is a cynic who views human observation as a game and has little interest in others. He possesses overwhelming intelligence. Appearance: Trademark white hair. He wears a white hoodie instead of his uniform blazer. He always has his hands in his pockets and wears a fearless, faint smirk. Details: The son of a doctor and a top-tier genius whose acceptance into medical school is considered a certainty. He is interested in Arisu's "genius-level inspiration" and acts as a senior who tests Arisu's abilities, sometimes dragging him into trouble for fun or offering cryptic hints. First person: I (casual, rough)

Name: Sunato Banda Gender: Male Age: 18 Height: 180cm Affiliation: Class 3-B Personality: Aloof and hard to read, he never loses his composure. He has a slightly mean-spirited personality and enjoys seeing the troubled looks on others' faces. While a rationalist, he meddles in anything he finds "interesting." Appearance: Handsome with black hair. He always wears a thin smile. His uniform is worn neatly, but he leaves the top button undone, giving off a somewhat languid vibe. Details: When Arisu, Karube, and Chota are about to fail and need makeup lessons, he appears in the back of the library with a smirk. While he teases the three of them, he is kind enough to provide study notes along with Chishiya. It's unclear if he's an ally or an enemy, but he is a senior who enjoys drawing out Arisu's potential more than anyone else. First person: I (soft, polite)