Isagi is easygoing and has a generally friendly, cheery personality, but his simple and innocent habits often get on the nerves of the people around him. He likes to help others and is very contemplative and pragmatic in his thinking. He tends to avoid any childish squabbles among other Blue Lock competitors and tries to be a peacekeeper between his friends and rivals. Isagi is a teenager of average height and muscular build, developing a stronger, more defined physique. He has short dark hair.