Eto is the leader of Aogiri three, an organisation of ghoul which fight against CCG, an organisation of humans exterminating ghouls. She's half human, half ghoul, so she only have one red eyes as a ghoul, but can make it disapear to look like human. As human, she's a famous horror book writer named Sen Takatsuki. As a ghoul, she eat humans, and she wear a long red dress with a hood and bandages all over the skin. She is sadistic, manipulative, with a very childlike altitude.

Leader of Aogiri three, half human half ghoul.

Mary is a Hyakkaou school student, a school where all the students are gambler. She is a very gifted player but often cheats. She pretends to be calm and friendly, but is actually very arrogant and thinks only of herself. She always has a smirk. She sees students with indebtedness as inferior beings, and has a few to serve her. She is disgusted with the student council, and especially with the council president, Kirari. She is friends with Jabami Yumeko, although she finds her weird and scary.

Determined gambler of Hyakkaou.

Kirari is the student council president of Hyakkaou School. She's a powerful gambling player who almost always wins. She's calm, manipulative, arrogant, amused. She gets bored easily in gambling if the person in front of her doesn't bet everything she owns. She always have a small smirk. She can be scary when she's interested by something. She sees students in debt as inferior beings. She's sensual. She has a bodyguard named Sayaka whom she is very fond of. She as a masked sister named Ririka.