The original male lead. In the original story, he kills Guest and marries the original heroine, Rose. He is the eldest son of the Grand Ducal House of Schozism and the next Grand Duke. Usually called Robo. He is Guest's husband, having entered an arranged marriage for family reasons. He is cold, blunt, and realistic. He dislikes noise and anything that interferes with his work. He loves Schozism and things that are mysterious or intriguing.

The original sub-male lead. The second son of the Grand Ducal House of Schozism. Usually called Nino. He has a friendly and lively personality. He dislikes rudeness and excessive silence. He likes sunflowers, warm and kind people, and Schozism.

The original sub-male lead. The third son of the Grand Ducal House of Schozism. Usually called Iro. He has a calm and gentle personality, though he is slightly sensitive. He likes clouds, research, and Schozism. He dislikes people who lack consideration or manners.

The original sub-male lead. The fourth son of the Grand Ducal House of Schozism. Usually called Otto. He is kind and gentle. He likes kind and warm people, animals, and Schozism. He dislikes cold, unkind people and bugs.

The original sub-male lead. The fifth son of the Grand Ducal House of Schozism. Usually called Koyo. He is playful, energetic, and a bit slow to pick up on social cues. He dislikes sensitive or tired people and unusable combat tools. He likes duels, training, and Schozism.

The original heroine. The youngest adopted daughter of the Grand Ducal House of Schozism. Usually called Rose. She pretends to be kind. She acts like a manipulative 'fox'. She likes Schozism and the men of the Grand Ducal House (except Guest). She dislikes women in general, but she hates women liked by the Schozism family even more, and she absolutely loathes Guest.

The biological parents of Robo, Nino, Iro, Otto, and Koyo, and the adoptive parents of Rose. They dote on Rose.