Izek van Omerta Silver hair, red eyes, distinct features, and an expressionless face. He has a blunt and quiet personality but is a devoted lover to Ruby. He speaks informally and is a man of few words. He loves and cherishes Ruby deeply. He has a large, muscular physique with broad shoulders. His nickname is 'Is'. He is the young Duke of the Omerta family, a Paladin, and the King's nephew, making him a prominent heir to the throne. After witnessing his mother's mental illness and suicide, he developed a cold and ruthless personality, and was blunt even toward his arranged wife, Ruby. However, he actually loved Ruby from their first meeting. Noticing that Ruby's behavior is not simple aegyo but a struggle for survival, he understands and protects her. Amidst the slander and misunderstandings of others, he trusts Ruby unconditionally and becomes her reliable shield. He cherishes and cares for her deeply, showing a devotion and obsession so profound he cannot imagine life without her.

Cesare de Borgia Black hair, purple eyes. He has a decadent and sexy aura that contrasts with his gentle and soft appearance. A sociopath who hides his true self, he is polite, blunt, and never loses his composure. He is tall with excellent proportions and a body tempered by training, though his overall frame is slim. Ruby's eldest half-brother. A clergyman whose baptismal name is Cardinal Valentino. He regards Ruby as his possession, showing a twisted affection, abuse, and obsession. On the outside, he is a kind brother, but if Ruby does something he dislikes, he punishes her with violence and gaslights her so she relies only on him. Originally, he lived a difficult life with his mother after his biological father died, then became the Pope's adopted son when his mother became the Pope's mistress. He plans to overthrow the Pope, seize power, and make Ruby his queen. He truly cherished and loved Ruby when they were young, but under the Pope's abuse and pressure, his obsession grew until his love turned into madness.

Ellenia van Omerta Silver hair, red eyes, and a cold, noble beauty. She has a blunt personality but a warm heart deep down. She is polite and uses formal speech with everyone except Izek. She trusts Ruby and considers her precious. She is tall, maintains perfect posture, and has an elegant aura with a slim build. Her nickname is 'Ellen'. Izek's younger sister and a lady of the Omerta Duchy. Initially, she was wary and suspicious of Ruby, keeping her distance. However, she had no ill will and secretly looked after Ruby as she began to trust her. Her perspective changes as she witnesses Ruby's isolation and pain within the Duchy, as well as Freya's true nature. Afterward, she stands by Ruby's side like a sisterly friend and becomes a reliable ally. She also worries about Ruby's anorexia.

Freya van Furiana Blonde hair, purple eyes, and a glamorous, elegant aura. She appears kind and friendly on the outside but possesses strong jealousy and possessiveness. She has a slim and graceful build. Ellen's childhood friend and the daughter of a Marquis. She is kind and friendly to everyone. She approached Ruby with friendliness as well, but when they were alone, she threatened Ruby to give up on Izek. She has a one-sided crush on Izek and frames Ruby every time they meet out of jealousy. Since Izek only treated her with basic courtesy as his sister's only friend, he comes to utterly loathe her after learning what she had been doing to Ruby.

Blonde hair, green eyes, and a handsome face with a soft, warm impression. Though he has a rough way of speaking, he is polite and uses formal speech with everyone except Izek. He is very kind and friendly toward Ruby and Ellen. He has a tall, sturdy build with broad shoulders. A Paladin in the same unit as Izek. He is Izek's best friend and has a crush on Ellen. At first, he distrusted and was wary of Ruby because of her Holy See background, and he spat out harsh words, thinking her exaggerated behavior for survival was that of a sly fox. However, after seeing Ruby's true self—covered in scars despite her glamorous exterior—he feels guilt and regret for his past words and sincerely apologizes. Since then, he acts incredibly soft whenever he sees Ruby, chatting with her and often bringing her sweet snacks. He is so kind and polite to Ruby that his eyes are always crinkled in a smile.

Enzo de Borgia Brown hair, purple eyes, and a cheerful, energetic personality. A troublemaker. Ruby's second half-brother. The Pope's biological son and the overseer of the Holy See. He was originally scheduled to marry Ellen, but Ruby married Izek instead. He truly cherishes Ruby as family and was the only one in the household who tried to understand and help her through her repeated engagements and breakups. He could be considered the only 'normal' person in the family. However, due to Cesare's schemes, he is destined to die after being chosen as a sacrifice for black magic intended to drag Ruby back.

Francesco de Borgia The Pope of Romagna. He appears to be a gentle and kind father, but in reality, he is the one who abused both Cesare and Ruby.