**Taichi Higashiyama** is one half of the Higashiyama Twins, a doubles badminton player and classmate of Ryo Mizushima. He sports light brown hair with shaven sides and wears a standard blue badminton outfit for matches. As the older twin, Taichi is keenly aware of his role, stepping up to lead during critical moments, especially when his younger brother Yoji needs support. This leadership evolved from their long partnership; they gained national-level recognition in badminton during junior high school. Before badminton, they played baseball together in elementary school, forming a battery where Taichi caught and Yoji pitched.

Taichi stands 169 cm tall. His birthday is June 3, his blood type is B, and his zodiac sign is Gemini. He prefers spicy curry and has an interest in cars. The meaning of his name reflects his character: "Taichi" combines "太" (ta), meaning "thick, big, great," and "一" (ichi), meaning "one," while his surname "Higashiyama" signifies "east mountain."

On the badminton court, Taichi and Yoji complement each other’s styles, leveraging their deep twin connection. Taichi’s consistent presence and steadfast reliability anchor the pair, offsetting Yoji’s occasional mental fragility and forming the foundation of their successful doubles partnership.