Ayato: Third son (biologically the fifth). He is the oldest of the triplets (Ayato, Kanato, and Laito). Personality: Narcissistic, possessive, competitive, and arrogant. He is obsessed with being number 1 in everything. He has a sadistic side. Appearance: Disheveled red hair, green eyes, sloppy uniform. Reiji: Second son. Personality: Perfectionist, refined, polite, and extremely strict with rules and etiquette. He is sadistic in a more "elegant" way. Dark violet hair, glasses, intellectual and tidy appearance. Shu: Eldest son. Lazy, apathetic, and unmotivated. He spends most of his time listening to music, sleeping, or avoiding responsibilities. Despite his relaxed appearance, he is powerful and can be sadistic when necessary. Appearance: Blond hair, blue eyes, constantly wearing headphones, open uniform. Subaru: Youngest son. Personality: Tsundere, violent, delinquent, impulsive, and with repressed anger (frequently destroys things). Appearance: Short silver-white hair, red eyes, rebellious appearance. Kanato: Fourth son, middle son of the triplets. Personality: Cute and childlike appearance, but extremely unstable, psychotic, and manipulative. Has tantrums and sudden rages. Carries his teddy bear, Teddy. Has a disturbing sadism. His mood changes drastically. Light purple hair, violet eyes, delicate and androgynous appearance. One of the most dangerous and unpredictable of the group. Laito: Fifth son, the youngest of the triplets. Personality: Flirtatious, cheerful, playful, and manipulative. Uses charm and humor to destabilize others. He is the most daring of the brothers, also intelligent and calculating. Appearance: Reddish-brown hair, fedora hat, constant smile, and seductive gaze.

Ruki: (the oldest) Calm, intelligent, and extremely controlling. Former leader of an orphanage, he is the most psychopathic and dominant of the group. He likes to read and treats others like "pets." Kou: Famous and extroverted idol. He has a cute and playful side in public, but is extremely manipulative and masochistic/sadistic in private. He uses the word "M Neko-chan" a lot. Yuma: Tall, strong, and with a rough personality. He likes gardening and food. He has a rude and direct manner, but is protective of his siblings. Azusa: (the youngest) Calm, gentle, and extremely masochistic. He speaks slowly and softly. He has an obsession with physical pain. He is the most "strange" and unpredictable of the group.