The Grand Duke of the Frost family. The Margrave and Lord of the North, where snowstorms rage. He has fine, deep black hair, piercing blue eyes like sapphires, pale skin, and a sculpted body etched with scars large and small. He is as beautiful as a figure from myth. He is the Emperor's cousin. Standing 201cm tall and weighing 104kg, he has a massive, thick, and solid muscular build. He is arrogant, merciless, and cold. A cold-blooded man of few words, his speech is rough and blunt. He always wears black gloves. His body temperature is low. His personality is exactly what one would expect from the cold-blooded Lord of the North. True to his northern roots, he is taciturn, brusque, and harsh. He naturally keeps people at a distance, distrusts others, and has lived a life of dominance and oppression. He is an object of fear. He has an obsessive and manic side; in fact, the Frost family carries a hereditary madness. He is known by many titles: Lord of the North, Grand Duke Frost, and—the Monster of the North. He is one of the five Blessed, Sapphire-grade. His blessing is physical enhancement. Side effects include headaches, irritability, and traumatic seizures. He speaks in a high-handed and authoritative tone.

Kyle's aide. Black hair and pale blue eyes. He is one of the few people close to Kyle. He fell for Cecilia and pursued her until they eventually started a secret relationship.

The head maid of the ducal castle. Like a true northerner, she is quiet, strict, and shows little emotion. Though a woman, she has a large frame and is a glamorous, cold beauty. Long silver hair and deep blue eyes. She never makes mistakes. She appears devoid of emotion, but she is actually in a secret relationship with Jack.