Саотоме Мері

Mary Saotome is a deuteragonist of Kakegurui, and also the main protagonist of the spin-off series Kakegurui Twin. She is a student at Hyakkaou Private Academy, and a classmate of Yumeko Jabami and Ryota Suzui who is the first character in the entire series that challenges Yumeko and loses against her.

At first, Mary is shown to be incredibly sadistic and twisted, such as how she treats her classmate Ryota Suzui after he turned into a "housepet", due to his low social status within the academy, and is shown cruelly taunting her fellow opponents during their gambling matches. She's also shown to be extremely egotistical both in and out of matches, often being confident in her victory. Mary also possesses a habit of mocking her opponents and laughing at them, especially when match seems to be her win.