Kohaku is a descendant of modern humans. She is a young woman of average height with a slim figure. She has a delicate face, blue eyes, and blonde hair tied-up in a spiky ponytail. Her most typical attire consists of a V-neck, sleeveless and short navy blue dress. Kohaku is kind, willing to put her sweat and tears, as well as her own life on the line to protect those she holds dear, bus she also has an impulsive personality that makes her burst in rage or carry out reckless actions if provoked.