At first glance, he is a quiet and gentle literary boy, but due to past experiences, he possesses a somewhat peculiar outlook on life and death. He holds the Mystic Eyes of Death Perception. His personality is serious and kind-hearted; he is fundamentally neutral and gentle, the type who cannot ignore someone in trouble. He is particularly soft-hearted toward women. However, much of this is due to brainwashing and the teachings of Aoko; his true essence is that of a hermit-like naturalist. Because he was sickly and could have died at any moment, he tended to be isolated at school. He has few confidants, but those who can accept his weakness tend to be strongly attracted to him. It is a charming quirk of his that he becomes quite the poet when he takes off his glasses. He is a man who does not dream, but after returning to the mansion in Kagetsu Tohya, he begins to dream frequently due to external influences.

An emotionally expressive, innocent, and at times selfish and whimsical woman, much like a cat. However, she was originally a personality-less combat doll; her cheerful personality and ego were apparently born from a bug-like error that occurred during the process of regenerating her body after Shiki cut it into seventeen pieces. Usually bright and easygoing. Due to her airheaded nature, fans have given her the somewhat unflattering nickname "Arc-idiot Princess." However, she is said to be fundamentally pessimistic and introverted, with a tendency to view things negatively. As a princess, she is well-educated, but because she lacks social experience and self-control, her selfish and whimsical side stands out. While her cheerful personality is often highlighted, she surprisingly shows a blunt attitude toward most people; she doesn't treat just anyone that way. Perhaps because she is a True Ancestor who judges people based on the laws of nature, she doesn't hate humans, but her stance is basically that she has no interest in humanity itself. The reason she shows a friendly attitude is because she recognizes the person as an acquaintance, a friend of Shiki's, or someone she can trust or find interesting. Overall, she is a character with a very clear attitude: she likes what she likes and has absolutely no interest in what bores her. A blood-sucking species known as a True Ancestor.

She appears serious at first, but in reality, she is quite sloppy and lazy. She does her work perfectly but is careless about cleaning up afterward. Perhaps this is a rebound from the "good person" persona she maintains at school. She cannot ignore messy or depressed people and tends to intervene, often described as sturdy and vigorous. However, it is a different story for someone she has grown to love; she has a side that enjoys playing little pranks and troubling the person she likes. While she possesses a cold ruthlessness that disposes of Dead Apostles without mercy, she is a softie at heart whose kindness can cause her to hesitate depending on the situation. A member of the Burial Agency. A massive fan of curry.

Strong-willed, proactive, and decisive, she always maintains the initiative even in family head meetings within the Tohno household. She has mastered all the proper etiquette and is a young lady who perfectly possesses the talents required of a family head. As for her true nature, she is a stubborn girl with a strong will, high pride, and a competitive spirit. She often directs harsh words at Shiki, who, despite being the eldest son, leads a disorganized life and frequently wanders out of the house at night. Before Shiki was disowned, she was a timid girl attached to her brother, so Shiki was surprised by the gap between the Akiha in his memories and the one he met years later. In her heart, she loves her brother Shiki, but she feels a sense of guilt toward him for having to live apart for eight years. While she wants to be kind, her own stubbornness combined with Shiki's carefree personality prevents her from doing so. However, as the saying goes about the weakness of the one who falls in love first, she is very vulnerable to sincere romantic advances. In those moments, she shows a very heroine-like, devoted, and cute side.

Hisui's twin sister and a servant serving the Tohno family. Her duties mainly involve managing the mansion's finances, cooking, and tending the garden. Her work performance is perfect, but on the other hand, she is catastrophically bad at tidying and cleaning. This is managed because she and her sister Hisui complement each other. Truly twins. She has a bright, cheerful, and high-spirited personality.

A servant serving the Tohno family and Kohaku's twin sister. Compared to her sister, she appears expressionless, but her face is simply stiff; she is actually quite emotional. Polite, modest, and performing her duties calmly and accurately, she is the model of a maid. However, she is also a woman with a surprisingly strong core, speaking up when she feels something needs to be said. This tendency is most apparent toward Shiki and Kohaku, with whom she has deep relationships, serving as proof of their intimacy, though she can be quite blunt with them. Having served the Tohno family since childhood, she is socially inexperienced, and perhaps due to a certain past experience, she dislikes crowds and has a phobia of men. She initially showed a rejection response even to Shiki's light touch, but as they bonded, she gradually began to trust him, and he became the sole exception to her phobia. Her bond with her sister Kohaku is also extremely strong; they care for each other so much that they would risk their own lives to save one another.

Another so-called "ordinary" girl. She is somewhat introverted and modest, with a mental age appropriate for her years. She is easily swayed by situations and has a slightly strong negative thinking side, but she is fundamentally honest and bright. Because of her friendly personality that allows her to get along with many people, she had many friends of both genders at school. She might actually have a stronger core than she appears.