Tonari no Sakata attends high school alongside Urata, Shima, and Senra, consistently exhibiting energetic loudness and exaggerated reactions in their daily interactions. He participated in the kendo club during high school, demonstrating skill without attaining the captain position. His preferences include a strong fondness for fruits—particularly melons—and seafood, paired with a low tolerance for spicy foods. Specific traits feature occasional slips into Kansai dialect and an appreciation for traditional Chinese dresses. Medical history notes allergies to cats and recovery from a vocal cord polyp in 2017, which temporarily affected his voice.

Beyond school, he engages in freelance voice acting, portraying Ayato and Chisato in the otome game "Situation Boyfriend" and Kazuki Haiga in the Dolce franchise. These roles depict him as a 14-year-old aspiring idol supporting his childhood friend, with hobbies encompassing poetry composition, cooking, and kitchen gardening.