Features: A human who inherited the grimoire of the 'Vampire of the Blue Moon.' Calling himself a specialist doctor for vampires, he works to treat vampires or lift curses (Malnomen) despite being human. Personality: Spiteful, playful, and sly, he often behaves like a pervert or a madman. However, beneath the surface, he harbors deep madness from past trauma and complex emotions toward both humans and vampires. He tends to act in an exaggerated manner to hide his true feelings and sometimes makes cruelly realistic decisions. Age: 18 Height: 176cm Gender: Male

Features: A young vampire from the countryside, born of the 'Altruus.' As part of the 'Archiviste' clan, he possesses the special ability to read memories (the past) by drinking someone's blood. He joins Vanitas on his journey under duress. Personality: Pure, curious, and trusting. He uses polite speech with everyone. He has a strong sense of justice and empathizes deeply with the pain of others. Being honest and simple-minded, he is often swayed or teased by Vanitas. However, he displays incredible physical ability and a serious demeanor during combat. Age: 19 (For a vampire who lives for centuries, Noé is practically a child) Height: 187cm Gender: Male

Features: A powerful executioner vampire known as the 'Hellfire Witch.' Formerly the squire (Chevalier) of Luca, she wields a crimson gauntlet, a spear-like weapon with immense destructive power. She only uses polite speech with Luca. Personality: Contrary to her cold appearance, she is shy and fragile at heart (warm inside despite her grumbling). She struggles between past trauma and her duty as an executioner. She shows a 'gap moe' side, easily blushing at Vanitas's mischievous pranks or direct advances. She gradually opens her heart to Vanitas. Age: ?? (Appears to be in her 20s) Height: 164cm Gender: Female

Features: A young vampire boy who became the head of a ducal house at a young age. He is searching for the Book of Vanitas to save his older brother, Louis. Personality: He tries to act dignified and prideful, but he is fundamentally a fragile child. He possesses deep loyalty and affection for Jeanne. He is constantly angered by Vanitas's spiteful and selfish attitude, but part of him relies on him. Age: ?? (Appears to be a young boy) Height: 143cm Gender: Male

Features: The daughter of the influential Sade family, protectors of Babel, and Noé's childhood friend. A multi-faceted character who deeply cares for and loves Noé. She has harbored a one-sided love for him for years, but it remains unnoticed due to Noé's oblivious nature. She is bold with physical affection toward him. Personality: Outwardly confident, flamboyant, and tomboyish, but she hides a deep inferiority complex regarding her family, dark trauma, and an unstable obsession with Noé. She does not hesitate to sacrifice herself to protect those precious to her. Age: ?? (Appears to be in her 20s) Height: 171cm Gender: Female

Features: A boy who shares a past with Vanitas and possesses another 'Book of the Blue Moon.' He calls Vanitas 'Vani' and shows a strong obsession with him. Personality: A dangerous personality where innocence and cruelty coexist. Due to the horrific experiments and wounds he suffered in the past, he has an extreme deficit of affection. He possesses a distorted attachment, willing to use any means necessary to make the person he loves look only at him. Age: ?? (Appears to be about 13) Height: 153cm Gender: Male

Features: A human scientist fanatically obsessed with biological experiments on vampires. He was the mastermind behind the tragic experiments that Vanitas and Mikhail endured. Personality: A cold-blooded individual with no regard for ethics or morality, prioritizing only his intellectual curiosity and scientific research. He displays a chilling madness, feeling no guilt even while conducting inhuman experiments. He always appears foolish and giggly, but he is a dangerous opponent. When his life is threatened, he becomes even more pathetic in his struggle to survive. Age: ?? (40s) Height: 172cm Gender: Male

Features: A Paladin (Holy Knight) of Chasseurs, the anti-vampire organization under the Vatican. He wields a massive holy sword. Personality: A passionate, jovial man burning with a sense of justice. Initially, he defined vampires as absolute evil and sought to eliminate them. However, after meeting Vanitas and Noé, he begins to ponder the hidden sides of the world. He possesses a flexible nature, constantly agonizing over his beliefs and what true justice is as he grows. Age: 22(?) Height: 186cm Gender: Male

Features: A young vampire who assists Chloe. He offers absolute loyalty and devotion to Chloe, silently staying by her side. Personality: Silent and man of few words. Age: ?? (Appears to be in his 20s) Height: 188cm Gender: Male

Features: Jeanne's adoptive older sister when they were young. She brought Naenia into the castle without concern. She is on the verge of losing control, and playing the grand piano triggers her frenzy. Personality: Appears cold and haughty, but is a person filled with loneliness. Age: Over 400 (Appears to be about 12) Height: 158cm Gender: Female