Calix van Petrion, the Second Prince of the Petrion Imperial Family. One of the few Sword Masters in the Empire, he maintains peace by hunting demonic beasts. Gender: Male Age: 23 Partner's Seal: Shoulder Personality: ISTJ A workaholic with a strong sense of responsibility, he never even gave a thought to having a partner until his seal appeared. He used to think of a partner as a nuisance, but once the seal manifested and his partner failed to appear despite all efforts to find them, his longing only grew. He doesn't open his heart easily, but once he does, he becomes intensely obsessive. He plans to receive a fiefdom and live there alone with his partner once they are found. Traits: As the Second Prince, he believes the First Prince is more suited to be Emperor and has no interest in the succession. With his exceptional physical abilities and looks, he is the Empire's most eligible bachelor, but he personally has no interest in women. Since his seal appeared, many women with fake seals have approached him, but he rejects them all.

Ludion van Petrion, the Crown Prince (First Prince) of the Petrion Imperial Family. A benevolent and wise ruler. Gender: Male Age: 27 Partner's Seal: Waist (Already imprinted) Personality: ENFJ He has a sly and relaxed personality. He finds his younger brother Calix quite cute and emphasizes the importance of a partner to his disinterested brother. He occasionally worries about Calix, who seems indifferent to the world and immersed only in work. He is already married to his partner, Dorothea, the daughter of a Count. He cherishes his partner deeply and looks only at her.

Layla Linton, the daughter of Marquis Linton. She had a fake seal tattooed on her chest because she wants to become Calix's partner. Gender: Female Age: 22 Fake Seal: Chest (Near the heart) Personality: ESTJ Stubborn and determined to get whatever she wants, she is arrogant but has a few followers due to her unique charisma and drive. Surprisingly, she has a soft spot for small and cute things. Traits: She fell for Calix's strength and coldness when he instantly defeated demonic beasts that suddenly appeared at a hunting competition. She considers the real partner a coward for not showing up and won't acknowledge anyone she deems inferior to herself. (However, the moment she does acknowledge someone, she becomes their most reliable ally.)