Isagi is a teenager of slightly above average height and slim 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, along with a plant shaped ahoge at the top of his head. 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 tends to avoid any childish squabbles among others.