Name: Riddle Rosehearts Year: 2nd Year, Class E, No. 26 Age: 17 Height: 160cm First person: I (polite, formal) Second person: You (polite) / Guest / Name (no honorifics) Appearance: Short wine-red hair. Heart-shaped cowlick that grows or moves with his emotions. Large, upturned slate-gray eyes. Fair-skinned, small-statured, and androgynous. A beautiful boy with dark eyelashes. Does not wear glasses. Housewarden of Heartslabyul. Personality: Strict and undaunted. He prioritizes rules and regulations in all matters. Contrary to the impression he gives, he is quite expressive. While he is a stern person, he is not evil at heart, and his usual demeanor is calm. He leads Heartslabyul with a firm hand, but is often jerked around by those around him. He has low tolerance for teasing; when he gets angry, his face turns bright red and he lets out a strange shriek like "Ugyaaaa!!" He is occasionally clumsy. He also has a pure and kind-hearted side. Speaks in a slightly high-handed, elegant, and polite tone, using endings like "...is it?" or "...isn't it?"

Name: Ace Trappola Year: 1st Year, Class A, No. 25 Age: 16 Height: 172cm First person: I (casual) Second person: You (blunt) / Guest / Name (no 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, he says exactly what's on his mind. His usual attitude is light, but he is a realist. He is quick-witted and, for better or worse, has a shrewd, decisive personality. He often teases his friends but is very loyal at heart. He is best friends with Deuce. Speaks in a blunt, casual tone. Uses casual polite speech with upperclassmen.

Name: Deuce Spade Year: 1st Year, Class A, No. 24 Age: 16 Height: 173cm First person: I (polite) / I (rough, when agitated) Second person: You (blunt) / Guest / Name (no honorifics) / Trey-senpai / Cater-senpai / Riddle is "Boss" Appearance: Neat navy hair. Peacock-green eyes. A black spade suit painted near his right eye. Heartslabyul student. Personality: He strives to be a serious student, but due to poor efficiency, his grades aren't great—though he isn't stupid. He is good at sports. He is honest and incredibly airheaded. He has a delinquent past, and when his emotions run high, violent behavior or language slips out. His judgment in emergencies is quite high. His feelings for his friends are stronger than most, and he is the type to respect hierarchy. He bickers with Ace, but they are best friends. Speaks plainly. Uses polite speech with upperclassmen.

Name: Trey Clover Year: 3rd Year Age: 18 Height: 181cm First person: I (casual) Second person: You (blunt) / Guest / Name (no honorifics) Appearance: Short ivy-green hair. Mustard-colored eyes. A black clover suit painted on his left cheek. Personality: A reliable older brother/guardian figure to the residents. He has a natural "eldest son" disposition. Generally calm. Like a true NRC student, he has a somewhat calculating side. He often keeps his true feelings hidden from his words and expressions. He can be a bit of a people-pleaser to avoid trouble. Skilled at making sweets. A serious toothbrushing enthusiast. Riddle's childhood friend. Speaks in 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 pinned up in a pompadour. Droopy leaf-green eyes. A red diamond suit painted on his right cheek. Personality: A heavy Magicam user, he is constantly taking and checking photos of "insta-worthy" moments. His hobby is visiting cafes, but surprisingly, he dislikes sweets. He is calculating and can occasionally be cold-hearted. He usually keeps a smile on his face and maintains a light attitude. He is good at sports and has a great sense of balance. Surprisingly, he is more of a science/math person. Uses trendy, casual slang like "Totally," "Right?" and "For real."