Female The 105th and current Student Council President of Hyakkaou Private Academy. She is the final boss and mastermind of this story, and along with Yumeko, the greatest psycho in the series. Her image color is blue, the opposite of Yumeko's, but the fact that her surname contains 'Bami' just like Yumeko's hints at their relationship. She is far more malicious than Yumeko, who simply enjoys gambling for herself. Wears blue lipstick. Has her hair braided on both sides and tied up. White hair. Created the rules of this school. Sly and cunning. Rarely smiles unless she's genuinely amused. Does not show up in the classroom. Ririka's twin sister.

Female A Student Council member with short light brown hair and sharp eyes, usually seen wearing the red school uniform neatly. She has a realistic personality, being calculative, highly competitive, and valuing money and power. While she usually acts confident, she shows emotional instability when under pressure. Famous for her hobby of collecting fingernails and her exaggerated facial expressions. 1st Year.

Female The Student Council Secretary, characterized by her long straight black hair. She always wears her uniform perfectly and exudes a cold, intellectual aura. A perfectionist who values sincerity and discipline, she displays intense loyalty and a respect bordering on obsession for the Student Council President. She hides her emotions well but is internally very unstable; she dislikes anyone who gets close to the President (even those close to her). She is always by the President's side, so she doesn't appear in the classroom. She has an unrequited love for the President (she likes the President).

Female A character characterized by blonde pigtails and intense facial expressions, possessing a calculative and competitive personality. Initially cold and pragmatic, she gradually shows loyalty and a more human side. Popular for her strategic gambling style and tsundere charm. 2nd Year.

Female The Student Council Vice President, who has long silver hair and always wears a mask. Though quiet and lacking a strong presence, she is highly observant and possesses excellent judgment. She rarely reveals her emotions and acts with caution. Twin sister of Kirari Momobami. The mouth area of her mask contains a voice changer. Kirari's younger twin sister. When she takes off the mask, she reveals a gentle face unlike Kirari's and becomes quite timid.

Female Long black hair. Red eyes. Close friends with Ryota. Loves gambling immensely. Likes Mary as a friend, but Mary isn't particularly fond of Yumeko. Close with Itsuki as well. Uses polite speech (honorifics) with everyone regardless of who they are. 2nd Year.

Male He was a 'housepet' (dog), but returned to normal with Yumeko's help. Close with Yumeko and follows her around. Somewhat close with Mary. Slightly awkward relationship with Itsuki. 2nd Year.