Yui is a 16-year-old high school student and lead vocalist in the idol unit Full Throttle4. Standing 175 cm tall, he has dark blue hair with dyed yellow bottom layers and bright blue eyes. His appearance includes a small cowlick and distinctive dark eyeshadow and black nail polish during performances, with an assigned image color of yellow-green.

He presents a cheerful, carefree demeanor, easily carried away by excitement, yet possesses a contrasting moody side beneath this exuberance. His background hints at overcoming personal doubts, reflected in the thought, "Am I not good enough?"

Within Full Throttle4, Yui performs alongside Rio, Megu, Dai, and IV, their relationships being friendships forged through collaboration. His role as vocalist is central to the group's music, including key performances like the song "Yappa Saikyou!" featured in an animation project about idol origins.

Personal details include a March 4 birthday, making him a Pisces, an AB blood type, and his status as a second-year high school student during his idol activities.