|Epithet||The Ice Queen|
|Affiliation||Destiny Security Organization|
|Base of Operations||Arctic Dungeon|
|Family||All of her family is deceased|
|Favorite Foods||Iced Coffee|
|Hobby||Making ice sculptures|
|Weapon(s)||Sealed Legacy Weapon -|
|Weight||51kg (112.4 lbs)|
Koyuki Ryūtaki is a Celestial hunter from Japan who isn't contracted to a Diva. She is also the leader of the Ice Demon guild.
Koyuki was the daughter of an beautiful snow woman and ice mage, in a secluded village on the outskirts of Edo. The village was cursed by Gremory to have eternal winter until they paid off their debt to her. One day the whole village decided to rebel against Gremory, which got everyone slaughtered mercilessly by Gremory; after she finished slaughtering everyone in the village Gremory started to cast a spell that would annihilate the village off of the face of the Earth, but she was halted by Koyuki's parents who in a last ditch effort used a barrier to seal Gremory and themselves in a tiny barrier to contain the spell. Koyuki was heartbroken when she saw her parents die right before her eyes, it was over in an instant. She left the village in search of a new home where she can sleep and eat, she was on the verge of death when she was found by a mysterious young woman who wore highly revealing clothing and carried around two nodachi. The mysterious woman claimed to be older than history itself and that she was on a mission to kill Gremory.
Koyuki is a mature and elegant young woman with the ethereal beauty of a blizzard and skin that radiates warmness despite looking as pale as snow. Her bueatiful and hypnotic yet icy blue eyes can make a man forget all of his troubles if her stares into them too long. She wears a blue and white kimono with an ice motif, she has black stockings and tabi sandals. She always wears her hair in a hime cut crossed with a standard samurai ponytail.
Koyuki has a dastardly and cunning personality, however, under this facade she deeply cares about her comrades. Leading a group of rebels, she has a righteous and caring personality which many of her men admire her for.