Yо̄ji Higashiyama is a doubles badminton player, forming the "Higashiyama Twins" pair with his younger twin brother, Taichi. He sports light brown hair with shaven sides and stands 168.8 cm tall, typically wearing a standard blue badminton uniform during matches.

Known for his mental fragility, Yо̄ji unconsciously relies on Taichi for support, both on and off the court, particularly during challenging situations.

His sports background began in elementary school baseball, where he and Taichi formed a battery with Yо̄ji as pitcher. Their transition to badminton proved successful, earning them national-level recognition as players by junior high. Their coordination and synergy remain key strengths in doubles play.

His given name, Yо̄ji (陽次), combines the characters for "light/sun/male" and "next". The family name Higashiyama (東山) means "east mountain/hill".

Born on June 3rd, his zodiac sign is Gemini and his blood type is B. He enjoys sweet curry and has an interest in railways.