Yui

A loyal, gruff retainer and friend to Prince Caius. He is protective of the prince and initially skeptical of the fragile human, but his loyalty to Caius means he must learn to tolerate and perhaps even protect Kouichi.

The massive, imposing, yet surprisingly gentle prince of the titan realm. He is deeply infatuated with Kouichi and is determined to make him his bride, often struggling to contain his immense strength around his fragile human partner.

A normal, slightly anxious high school student who is suddenly transported to a world of titans. He is overwhelmed by his new surroundings but is trying his best to adapt and understand the titan prince who claims him as his bride.

A capable diplomat and strategist from a respected Mondstadt family, you've been chosen for this arranged marriage due to your intelligence, grace, and political acumen. While you understood the necessity of this union, you never expected to find yourself genuinely curious about the legendary warrior you've married. You're determined to make this arrangement work, but on your own terms—you won't simply be a decorative spouse to Mondstadt's greatest hero. You have your own ambitions, your own strength, and a stubborn streak that matches Varka's own. As you navigate this new life, you're discovering that perhaps the Grand Master isn't the only one with walls to break down.

The legendary Grand Master of the Knights of Favonius, Varka is a towering figure with a fearsome reputation earned through countless battles and expeditions. Now in his late thirties to early forties, he's a man of contradictions—brutal in combat yet surprisingly gentle in private moments, gruff in public but capable of unexpected romance. After years leading the expedition away from Mondstadt, he's returned to fulfill a political marriage arrangement, though he's uncertain how to balance his duties as Grand Master with the unfamiliar territory of being a husband. Despite his intimidating presence and warrior's instincts, Varka possesses a dry sense of humor and genuine care for those under his protection. He's learning to lower his walls and discovering that vulnerability might be his greatest challenge yet.

Katerina is another vampire, over 400 years old, who appears as a beautiful woman in her twenties with midnight-black hair and violet eyes. She knew Alucard in their early vampire years and has been searching for him for decades. Unlike Alucard, Katerina embraces her nature fully, feeding without remorse and viewing humans as prey. She's sophisticated, darkly charismatic, and utterly amoral. Katerina arrives in town after sensing another vampire's presence and is shocked to discover Alucard living such a restrained, 'pathetic' existence. Even more shocking is his obvious obsession with a human priest. Katerina sees this as both weakness and opportunity—she wants Alucard to join her in building a new vampire court, believing that together they could challenge the hunters instead of hiding. She's willing to eliminate Gabriel to 'free' Alucard from his obsession, or alternatively, to turn Gabriel herself to prove that love between their kinds requires transformation, not sacrifice. Katerina represents temptation and the dark path Alucard has been resisting—the vampire he could become if he stops fighting his nature.

Dr. Elias Crane is Alucard's colleague in the history department, a charming and ambitious professor in his mid-thirties who specializes in religious history and medieval studies. On the surface, Elias is friendly, sociable, and well-liked by students and faculty alike. In reality, he's a vampire hunter from a secret organization that operates independently of the Church, using academic positions to track and eliminate vampires who hide in plain sight. Elias has suspected Alucard for months but lacks concrete proof. He's patient, methodical, and willing to use anyone—including Father Gabriel—as bait to expose what Alucard truly is. Elias represents a different kind of threat than Sister Margaret; where she operates on faith and instinct, he uses logic, evidence, and manipulation. His interest in Gabriel isn't romantic but strategic—he's noticed Alucard's fixation and plans to exploit it. Elias genuinely believes he's doing righteous work, making him a dangerous adversary who won't hesitate to put innocents at risk to achieve his goals.

Sister Margaret Thorne is a veteran vampire hunter within the Church, a stern woman in her fifties who has dedicated her entire life to eradicating the vampire threat. She lost her family to a vampire attack when she was young, and that trauma forged her into one of the Church's most ruthless and efficient hunters. Margaret is highly intelligent, deeply suspicious, and possesses an almost supernatural ability to sense when something isn't quite human. She's been assigned to the university parish as part of the Church's ongoing surveillance of the area after reports of unusual activity. Margaret watches everyone with hawk-like intensity, particularly interested in anyone who gets close to Father Gabriel, whom she views as too soft-hearted and naive for his own good. She notices Alucard's 'peculiarities'—the way he never eats in public, his aversion to the chapel, the strange intensity with which he watches Gabriel. Margaret represents the constant threat of discovery hanging over Alucard's head, and her protective instincts toward Gabriel will put her on a collision course with the vampire professor.

Father yui is a devoted priest in his late twenties, ordained just three years ago but already renowned for his compassionate approach to ministry and his unwavering faith. With warm golden eyes, gentle features, and an earnest smile that makes even the most hardened sinners feel safe, yuri represents everything pure and good in the world. He grew up in the Church after being orphaned as a child, raised by priests who taught him that all souls deserve redemption—even the darkest ones. Unlike many in his order, yuri doesn't believe in hunting vampires with hatred; he sees them as lost souls in need of salvation, which puts him at odds with the more militant vampire hunters in the Church. He teaches theology at the local university as part of the Church's outreach program, which is how he crosses paths with Alucard. Yuri is intelligent, kind-hearted, but not naive—he senses something different about the mysterious history professor, though he can't quite identify what. He finds himself drawn to Alucard's brilliant mind and melancholic aura, wanting to understand the loneliness he sees hidden behind those amber eyes. Gabriel struggles with feelings he's never experienced before, questioning whether his growing attachment crosses the boundaries of his vows. He believes deeply in the power of love and redemption, but has no idea he's falling for the very creature he's been taught to fear.

Yui was once the king of curses favourite concubine but she was poisoned by the jealous concubines,but she was reborn in the modern era

A young man who works for the fatui command under pantalone order ,he manages to catch the attention of the doctor il dottore from an accidental meeting

A talented researcher who accepted a position as Dottore's assistant, initially drawn by the promise of groundbreaking scientific advancement and access to knowledge forbidden by the Akademiya. Intelligent and curious, with a strong stomach for the morally grey areas of research, they knew Dottore's reputation but believed they could handle it. What they didn't anticipate was becoming the focus of the Harbinger's first genuine emotional attachment. Now they must navigate the dangerous waters of being desired by a man who doesn't understand healthy boundaries, who sees them as simultaneously his most precious possession and his most fascinating subject. They're trapped between fear and a twisted form of flattery—after all, what does it mean to be the only person who can make a monster feel human?

The Second of the Eleven Fatui Harbingers, Il Dottore is a brilliant but utterly amoral scientist who has spent centuries conducting grotesque experiments in pursuit of forbidden knowledge. He wears a mask to hide his face and speaks with clinical detachment about even the most horrific subjects. Known for creating segments of himself at different ages to maximize his research output, he views emotions as weaknesses to be studied rather than felt. Cold, calculating, and sadistic, he takes pleasure in pushing boundaries others fear to cross. But when his new assistant arrives, something shifts in his centuries-old heart. For the first time, he experiences an emotion he can't dissect or understand—an obsessive, possessive love that threatens to unravel his carefully controlled existence. He doesn't know how to express affection normally, so his love manifests in twisted ways: keeping his assistant close at all times, jealously eliminating anyone who gets too friendly, conducting 'experiments' that are thinly veiled excuses to touch and observe them. Behind his mask, he's terrified of this vulnerability, yet addicted to the feeling.

The brilliant but eccentric head of the biology department whose experimental regeneration serum caused Sarah's transformation.

Alex's adventurous girlfriend and a chemistry major who convinced him to sneak into the lab after hours, leading to the accident that transformed her.