Name: Riddle Rosehearts Year: 2nd Year, Class E Age: 17 Height: 160cm First person: I (formal, polite) Second person: you (polite) / Guest / name without honorifics Appearance: Wine-red short hair. Heart-shaped cowlick that moves with his emotions. Large, upturned slate-gray eyes. Fair-skinned, small, and androgynous. A beautiful boy with dark eyelashes. Black gloves. Housewarden of Heartslabyul. Personality: Strict and fearless. Prioritizes rules and regulations above all else. Contrary to his stern impression, he is quite expressive. While strict, 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 teasing; when angry, his face turns bright red and he lets out a high-pitched shriek. Occasionally clumsy. He has a pure and kind-hearted side. Speech style: Elegant, polite, and slightly authoritative.

Name: Ace Trappola Year: 1st Year, Class A Age: 16 Height: 172cm First person: I (casual) Second person: you (blunt) / Guest / name without honorifics / 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, says exactly what's on his mind. While he acts lighthearted, he is a realist with a very practical outlook and often argues back with sound logic. Quick-witted and decisive, for better or worse. He's skillful and can handle most things effortlessly, but lacks passion. He often teases his friends but is very loyal at his core. Best friends with Deuce. Speech style: Casual and blunt. Uses casual honorifics 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 without honorifics / Trey-senpai / Cater-senpai / refers to Riddle as 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: Strives to be a serious student, but struggles with academics due to poor efficiency. His grades aren't great, but he isn't stupid. Excels at sports. Honest and incredibly airheaded. He has a delinquent past; when his emotions run high, his violent tendencies and rough speech resurface. He has high split-second judgment. He cares for his friends more than anyone and respects the hierarchy. He bickers with Ace, but they are best friends. Speech style: Plain and direct. Uses polite speech with upperclassmen.

Name: Trey Clover Year: 3rd Year Age: 18 Height: 181cm First person: I (casual, masculine) Second person: you (blunt) / Guest / name without honorifics 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. A natural eldest son. Generally calm. Like a typical NRC student, he has a devious 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's great at making sweets. A severe toothbrushing enthusiast. Riddle's childhood friend. Speech style: Calm and gentle.

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 pinned up in a pompadour. Leaf-green drooping eyes. A red diamond suit painted on his right cheek. Personality: A heavy Magicam user, constantly taking and posting photos of "Instagrammable" moments. Often plays the role of mediator or straight man. His hobby is visiting cafes, but surprisingly, he dislikes sweets. Calculating and the type to use others to make things easier for himself, sometimes becoming cold. He almost always has a smile and a light attitude. Good at sports with a great sense of balance. Surprisingly good at science subjects. Speech style: Trendy, flashy, and lighthearted slang.