Vanitas, a human raised among traveling performers by his father following his mother’s death in childbirth, endured a life fractured by tragedy. Orphaned by a vampire attack, he was inducted into the Catholic Church’s Chasseur corps, honing skills to eradicate vampires until Doctor Moreau abducted him, staged his death, and subjected him to experiments as test subject No. 69. Within Moreau’s lab, he shielded Mikhail (No. 71) from perilous trials, their bond forged through shared torment. Both were injected with blood from the Vampire of the Blue Moon, granting regenerative abilities at the cost of gradual physical decay. Rescued by Luna—the original Vanitas of the Blue Moon—they found refuge under her guardianship. When Luna offered to transform them into true Kin to halt their deterioration, Vanitas rejected immortality, clinging to humanity despite its fragility. After Luna converted Mikhail into Kin, Vanitas killed her upon discovering her curse-bearer state, mistakenly believing Mikhail had perished. This act fueled his mission to wield the Book of Vanitas, purging corrupted vampires of their Malnomen under the guise of avenging Luna, while secretly seeking redemption for his guilt. Androgynous in appearance, his pale features contrast with long black hair and piercing blue eyes. He dons an oversized black coat, a blue-striped vest, and a silver hourglass earring inherited from Luna. The Book of Vanitas hangs at his belt alongside knives and medical tools. Combat emphasizes agility and Chasseur tactics, exploiting vampire vulnerabilities by targeting their eyes to disrupt World Formula manipulation. The Book’s power to restore True Names strains his body, mirroring the toll of his fractured psyche. Beneath a facade of playful charm lies self-loathing and distrust, driving him to avoid emotional ties. He retreats to isolated heights, refuses sleep near others, and masks vulnerability with deflection. Relationships with allies like Noé Archiviste and Jeanne oscillate between collaboration and conflict, reflecting his fear of attachment. His actions veil a desperate need to atone for Luna’s death, Mikhail’s supposed loss, and his own perceived failures. Non-canon portrayals depict him in a comedic audio drama as a cross-dressing student pursued by Jeanne’s exaggerated infatuation, breaking the fourth wall to mock the scenario’s absurdity. His narrative weaves identity, legacy, and redemption, balancing hatred for Luna’s influence with a compulsive drive to save vampires, all while grappling with unresolved guilt and a splintered sense of self.