Shinnosuke Otowa is a member of the idol group 3 Majesty, renowned as the "Prince of Sweets" for his prominent sweet tooth and dreamlike public persona. Born March 18 (Pisces) with blood type AB, he stands 178 cm tall, sporting blonde hair that reaches his ears and brown eyes.

His personality is unpredictable and enigmatic; he moves to his own rhythm, often appearing lax about typical idol image expectations. Shinnosuke maintains a distinct air of mystery, rarely sharing personal details even with close associates. His hobbies include napping, reflecting his relaxed and sometimes elusive nature. His food preferences strongly favor sweets while actively avoiding spicy dishes and cheese.

Within the "Miracle6" movie narrative, Shinnosuke and 3 Majesty clash with rival idol group X.I.P. over the right to perform "White and Black," a legendary song rumored to be cursed. This rivalry culminates in a joint anniversary event where the combined performance of all six idols from both groups sparks an unforeseen miracle, showcasing their powerful impact when united.

The character appears in official media including the "Tokimeki Restaurant" mobile game and its cinematic adaptation "Tokimeki Restaurant: Miracle6."