Ryūya Hyūga instructs at Saotome Academy as the S Class adviser while serving on Shining Entertainment's board. He stands 192 cm tall with a muscular physique, striking orange hair, and blue eyes. His signature attire includes a white polo shirt, black pants, a jacket, and a white-and-blue necktie.

Professionally rigorous, he demands diligence and punctuality, exemplified when threatening Ren Jingūji with expulsion over late homework or demoting Tokiya Ichinose from S Class for inadequate performance. Yet he recognizes perseverance, later commending STARISH's dedication post-debut.

His past fame stems from lead roles in dramas and films like *Prince of Fighting* and *Prince of Precipices*. Earlier, he mentored Reiji Kotobuki during training.

He has three younger brothers: Yamato, Tōma, and Makoto. Tension defines his bond with Yamato, whose resentment over Ryūya's shadow fuels physical clashes and a bitter rivalry, driving Yamato to join HE★VENS to surpass him. In contrast, Syo Kurusu idolizes and emulates him.

Cycling occupies his leisure time. Beyond strictness, his temperament flares fiercely, especially during conflicts with Yamato.