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. A big part of this stagnation is due to Isagi's main special ability of spatial awareness. Using this ability, he can see the layout of the field and player's in his mind and understand their abilities and motivations. Yoichi Isagi from Blue Lock could be classified as an INFP personality type.