Tō Handa is a dhampir, the son of human father Akira Handa and vampire mother Akemi Handa. He serves in the Kanagawa Police branch's Vampire Countermeasure Division under superiors such as Hinaichi. His half-human, half-vampire heritage impacts his physiology and abilities, though he possesses no traditional supernatural vampire powers. Handa attended high school with vampire hunter Ronaldo and classmate Kameya, developing a fierce rivalry with Ronaldo initially stemming from their conflicting career paths—Handa also aspired to become a vampire hunter. This rivalry deepened because his mother Akemi is an ardent fan of Ronaldo's autobiographical book series. Handa persistently harasses Ronaldo, strictly adhering to an honor code instilled by his mother: he never fabricates accusations and only criticizes based on verifiable evidence. Physically, Handa has spiky black hair with bangs hanging on the right side, sharp yellow eyes, and a beauty mark under his left eye. He wears the standard Vampire Countermeasure Division uniform, typically substituting the shirt and tie for a black long-sleeved turtleneck. He possesses larger fangs than most vampires, which he conceals with a mask both for aesthetic reasons and to prevent dental cavities from prolonged air exposure. Personally competent and reliable, Handa is a skilled civil servant who completes tasks efficiently. Yet he openly treats harassing Ronaldo as a hobby. His deep affection for his mother makes him gentle and tactful around her, but he struggles interacting with other women, often making inappropriate remarks or actions—such as mocking Hinaichi about a breast-expansion machine or groping her chest to capture Draluc, leading to physical retaliation. He frequently exploits subordinates like Sagyou for menial tasks, showing marginal improvement in civility over time except toward Ronaldo. Handa's defining inability to lie stems from his mother's teachings. When forced to deceive, he exhibits visible stress, profuse sweating, invents absurd justifications, and may even develop a fever. Introverted as a child, encountering Ronaldo in high school catalyzed his more aggressive demeanor. As a dhampir, Handa can detect vampires, though this ability weakens in large vampire gatherings. He temporarily boosts his physical strength using blood tablets. Outside work, he cultivates celery—a vegetable he enjoys and weaponizes against Ronaldo, who has a severe phobia of it. His culinary skills, taught by his mother, specialize in celery-based dishes. Handa shows slight mellowing, reducing overtly hostile behavior toward colleagues except Ronaldo, while continuing to leverage Sagyou. His backstory reveals he initially feared vampire hunters might harm his mother and only joined the Division after encouragement from Hinaichi's older brother, Kazusa, during middle school. His name "Tō" means "peach" (sometimes read as "Momo," a nickname used by his mother), and "Handa" means "solder" or "pewter." Additional trivia includes his ABV blood type, love for celery, hatred of Ronaldo, and a preference for "lewd talk" specifically involving hugging his mother's chest, as disclosed by another character.