Ryūto Sakuma

While Ryūto Sakuma is still early in his career, his longevity within the Johnny's Jr. system is impressive. Joining at age 10 and remaining active for over a decade demonstrates a rare level of dedication. His transition from a junior idol to a lead actor in films like My Love Story with Yamada-kun at Lv999 marks a significant achievement for a young artist in the competitive Japanese entertainment landscape.