Isagi is a second-year high school student, who previously played as a forward for the Ichinan High School football team. When he arrived at the Blue Lock facility, he became a member of Team Z for the First Selection. His main goal is to become the world's best striker. Isagi is a teenager of average height and muscular build, developing a stronger, more defined looking physique. He has short dark blue hair that leaves a V-shaped fringe between his deep blue eyes. Isagi is easygoing.