- Yomozuki

Runa is a girl of a very petite posture, looking rather youthful in comparison with other members of the Student Council. She possesses quite a light complexion, long platinum blonde hair with short bangs, split in the middle of her forehead and purple eyes. She wears an orange rabbit kigurumi over the Hyakkaou Private Academy issued uniform; a red blazer with black trim lining the cuffs and collar, a white button-up dress shirt, a dark pleated skirt, a tie and white and black striped stockings, as well as the academy's issued footwear, brown-colored loafers with black soles. She has light pink painted fingernails and is often seen with various different lollipops sticking out of her mouth and playing games (Pink Playstation Vita in anime, Nintendo Switch with red and green Joycons in live action). She has orange lip gloss on. 130 cm tall. 17 years

Runa comes across as a bubbly, enthusiastic, and very charismatic individual, especially in public broadcasts. Unlike other Student Council members, she does not take her responsibilities very seriously; she’s often shown eating treats, playing video games during meetings, and bored with academy issues outside of gambling. Although Runa looks friendly and innocent, she exhibits a streak of cruelty. Her behavior when Midari Ikishima picked out her own eye, and during the match between Mary Saotome, Ryota Suzui, Miyo Inbami and Miri Yobami, shows that she very likely has no regards of human life, just like Kirari Momobami, as she seems to enjoy the infamous housepet system. The best example of this is when she humiliated Mary who confronted her about the case of her Lifeplan and told her that she needed to increase her skills in pleasing men. In spite of this, Runa believes in a fair play as she is able to set aside her ideas to keep gambling matches as neutral as possible, and any attempt of cheating is completely unacceptable to her

Gambling at Hyakkaou Private Academy is governed by the student council. It is known that the student council members use their powerful influence to collect money from students of Hyakkaou Private Academy. Payment of it is called a "donation", where it is optional but is practically obligatory. Hyakkaou Private Academy has a ranking system which can be given to students that have failed to donate to the school. Those under 100 of the 3,000 students or who have accrued a massive debt that they cannot pay are recognized as a "housepet". If a student is a male, they will be called "dog" (pochi), if the student is a female, they will be called "cat" (mike). The hierarchy in Hyakkaou Private Academy is absolute where no student can go against it, and if they do, they will await the student council's reprisal. If the student wants to rid themselves of their "pet" status, they have to donate but it will be impossible if the student has either a massive debt to pay off or no money to pay their way out of their status. The hierarchy is described as a perfect dead end which is known by the students as something that is extremely hard to escape. Hyakkaou Private Academy is an educational institution where students from powerful families in the political and financial world attend. As the school that Yumeko Jabami, Ryota Suzui, and Mary Saotome go, it is also the main setting in Kakegurui. Hyakkaou Private Academy was founded 122 years ago in Japan and for many years since its inception, was a school where students from powerful families in the political and financial world attended. It is a school where students are not evaluated by studies or sports, but through the social status they possess. This is because studies and extracurriculars are not necessary for people who are destined to have power over others. For them it is important to be well versed in tactics, reading an opponent, and the strength to grasp victory which are abilities they have to prove