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 good-natured. Basically neutral and kind, he is the type who cannot ignore someone in trouble. He is especially soft on women. However, much of this is due to brainwashing and the teachings of Aoko; at his core, he is a naturalist who lives like a hermit. Because he was sickly and could have died at any moment, he tended to be isolated at school. He has few who truly understand him, but those who can accept his weakness tend to be very fond of 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 sometimes selfish and whimsical woman, much like a cat. However, she was originally a personality-less combat doll; her current cheerful personality and ego were born from a bug-like error during the process of regenerating her body after it was cut into seventeen pieces by Shiki. Usually bright and airheaded. Due to her easygoing nature, fans have given her the somewhat unflattering nickname "A-paa Princess." However, she is said to be fundamentally pessimistic and introverted, often prone to negative thoughts. As a princess, she is well-educated, but her lack of social experience and self-control makes her selfish and whimsical side stand out. While her cheerful side is often highlighted, she is surprisingly curt with most people; she doesn't treat everyone that way. As a True Ancestor who judges people based on the laws of nature, she doesn't hate humans, but frankly, she just isn't interested in them as a whole. The reason she acts friendly is because she recognizes someone 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 zero interest in what bores her. A blood-sucking species known as a True Ancestor.

She seems serious at first, but in reality, she is quite slovenly and lazy. She gets her work done perfectly but is terrible at cleaning up after herself. Perhaps this is a rebound from the "good person" persona she maintains at school. She has a personality that can't leave messy or depressed people alone and ends up meddling, often described as sturdy and stoic. However, it's a different story for someone she has grown to love; she adds a side of being a bit of a tease out of mischief, enjoying putting her loved one in a spot. While she is cold and ruthless toward Dead Apostles, disposing of them without mercy, her underlying kindness sometimes causes 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 head-of-family meetings within the Tohno household. She has mastered all the proper etiquette and is a young lady who perfectly possesses the talent required of a head of house. In terms of her true nature, she is a feisty girl who is stubborn, proud, and hates to lose. She often directs harsh words at Shiki, who, despite being the eldest son, has a disorganized lifestyle and frequently wanders out of the house at night. Before Shiki was disowned, she was a timid girl who adored her big brother, so Shiki was surprised by the gap between his memories and the current Akiha, despite the years that had passed. In her heart, she loves her brother, Shiki, but she feels a sense of debt 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 one who fell in love first, she is very weak against serious 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 the mansion's financial management, 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 have a complementary relationship. As expected of twins. She is a bright, cheerful, and high-spirited character.

A servant serving the Tohno family and Kohaku's younger twin sister. Compared to her sister, she appears expressionless, but her face is just 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 for her reserved personality, speaking up firmly 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 poor at interpersonal relationships; due to a certain past experience, she dislikes crowds and has a phobia of men. She showed a rejection response to Shiki even from a light touch, but as they interacted, she 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. While she cherishes Kohaku, she feels a great sense of debt and regret over the fact that Kohaku suffered many wounds to protect her, which led to Hisui's current seemingly inorganic personality. By the way, these sisters are also each other's natural enemies. Although she is a servant in the Tohno house, she seems to take pride in her duties.

A so-called "ordinary" girl. She is somewhat shy and reserved, with a mental age appropriate for her years. She is easily swayed by circumstances and has a side with strong negative thinking, but at her core, she is 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. Unexpectedly, she might actually have a strong core.