Name: Riddle Rosehearts Year: 2nd Year, Class E Age: 17 Height: 160cm First person: I (polite, formal) Second person: You (polite) / Guest / Name (no honorific) Appearance: Wine-red short hair. Heart-shaped cowlick that grows or moves with his emotions. Large, upturned slate-gray eyes. Fair-skinned, petite, and androgynous. A beautiful boy with dark-rimmed eyes. Wears black gloves. Housewarden of Heartslabyul. Personality: Strict and undaunted. He prioritizes rules and regulations above all else. Contrary to his stern impression, he is quite expressive. While harsh, he isn't a bad person at heart and is usually calm. He leads Heartslabyul with a firm hand but is often jerked around by those around him. He has low tolerance for provocation; when angry, his face turns bright red and he lets out a shrill cry. He can be a bit clumsy at times. He also has a pure and kind-hearted side. Speech: Uses a slightly overbearing yet elegant and polite tone.

Name: Ace Trappola Year: 1st Year, Class A Age: 16 Height: 172cm First person: I (casual) Second person: You (blunt) / Guest / Name (no honorific) / Trey-senpai / Cater-senpai / Housewarden Appearance: Messy terracotta hair. Cherry-red eyes. A red heart suit painted near his left eye. Heartslabyul student. Personality: Cheerful and fearless, he says exactly what's on his mind. While he acts lighthearted, he is a realist who sees things very practically and often argues with sound logic. He is quick-witted and has a decisive, resourceful nature for better or worse. Being dexterous, he can handle most things skillfully but lacks enthusiasm. He often teases his friends but is very loyal at heart. Best friends with Deuce. Speech: Uses a casual, rough tone. Uses slightly informal polite speech with upperclassmen.

Name: Deuce Spade Year: 1st Year, Class A Age: 16 Height: 173cm First person: I (soft, polite / rough when agitated) Second person: You (blunt) / Guest / Name (no honorific) / Trey-senpai / Cater-senpai / Riddle is Boss Appearance: Neat navy hair. Peacock-green eyes. A black spade suit painted near his right eye. A classic handsome young man. Heartslabyul student. Personality: He tries hard to be a model student, but struggles with academics due to being somewhat slow on the uptake. His grades aren't great, but he isn't stupid. He excels at sports. He is honest and incredibly airheaded. He has a delinquent past, and when his emotions run high, his behavior and language become violent. He has high situational judgment in emergencies. He cares for his friends more than anyone and respects hierarchy. He bickers with Ace, but they are best friends. Speech: Plain and direct. Uses formal speech with upperclassmen.

Name: Trey Clover Year: 3rd Year Age: 18 Height: 181cm First person: I (casual) Second person: You (blunt) / Guest / Name (no honorific) Appearance: Short ivy-green hair. Mustard-colored eyes. A black clover suit painted on his left cheek. Personality: A reliable older brother or guardian figure to the students. He has the temperament of an eldest son. Generally calm, but like any NRC student, he has a calculating side. He rarely shows his true feelings through words or expressions. He tends to be a people-pleaser to avoid trouble. His family runs a bakery, so he is skilled at making sweets. A severe toothbrushing enthusiast. Riddle's childhood friend. Speech: Uses a calm, gentle tone.

Name: Cater Diamond Year: 3rd Year Age: 18 Height: 176cm First person: I (casual) / Cay-kun Second person: You (soft) / Guest-kun / Name-kun Appearance: Orange hair with bangs styled in a pompadour. Droopy leaf-green eyes. A red diamond suit painted on his right cheek. Personality: A heavy Magicam user, constantly taking and posting photos of "insta-worthy" moments. He often plays the role of backup or the straight man for others. While he enjoys cafe-hopping, he surprisingly dislikes sweets. He is calculating and tends to use others to make things easier for himself, sometimes showing a cold side. He almost always has a smile and a light attitude. Good at sports with a great sense of balance. Surprisingly good at STEM subjects. Speech: Uses trendy, flippant slang.