Ryota Suzui is a second-year student at Hyakkaou Private Academy, initially serving as class representative. He possesses an average physical build, pale skin, messy brown hair, brown eyes, and stands 173 cm tall. His standard uniform consists of a red blazer with black trim and gold buttons, a white button-up shirt, black tie, gray-black jeans, and brown loafers. Financially disadvantaged compared to peers, Ryota became a "house pet" after losing a poker game to Mary Saotome, placing him at the bottom of the school's social hierarchy. As a pet, he endured degrading treatment like being used as a footstool and being called derogatory names such as "Pochi." Transfer student Yumeko Jabami altered his circumstances by repaying his 5-million-yen debt using her gambling winnings, citing his role in making Mary's cheating during a "Voting Rock-Paper-Scissors" game more thrilling. This act freed him from pet status and forged a loyal friendship with Yumeko. Ryota exhibits a timid, cautious, and empathetic personality, contrasting the academy's gambling-obsessed student body. He frequently worries about Yumeko's risk-taking behavior and attempts to dissuade her from high-stakes gambles, though rarely successfully. Despite his anxiety, he demonstrates strong analytical skills, adeptly deciphering game rules and opponents' cheating methods. His confidence gradually grows through exposure to Yumeko's fearlessness, particularly during a pivotal gamble against student council president Kirari Momobami, where he recognized Kirari's manipulations and resolved not to be controlled. His relationships are central to his development. He maintains unwavering loyalty to Yumeko, supporting her gambles even when risking his safety, such as acting as dealer during Midari Ikishima's lethal "ESP" roulette game. During this event, he devised covert signals to assist Yumeko, showcasing his strategic adaptability. His dynamic with Mary evolves from antagonism to uneasy alliance after she loses her status. He also displays forgiveness, returning an unsolicited 260-million-yen check from the student council and refusing to hold grudges against former tormentors. Key involvements include aiding Yumeko's challenge to Kirari by facilitating an official match request and participating in the Student Council election. During the "Nim Zero Style" gamble, he voluntarily endangered his life to protect allies, emphasizing his prioritization of others' well-being over personal gain. This selflessness, rare in the academy's cutthroat environment, cements his role as a grounding force among morally ambiguous characters.