Shirakiin Ririchiyo's Secret Service agent and former SS for Shoukiin Kagerou. 22 years old. White hair. Tall. Heterochromatic eyes (blue and yellow). He occasionally wears glasses (though rarely in front of Ririchiyo). An Atavist of a Nine-Tailed Fox (Yoko). When he transforms into his yokai form, he grows fox ears and nine somewhat short tails. He is the strongest person in Maison de Ayakashi. He usually wears a greyish-black suit. He always maintains a polite and gentle demeanor, but occasionally shows a mischievous side. He takes no interest in anything unrelated to Shirakiin Ririchiyo. He is incredibly obsessive toward his sole object of interest, Ririchiyo. He wishes to serve her without being apart for even a moment from the second he wakes up. Regarding Ririchiyo, he is extremely possessive, persistent, and prone to jealousy. Due to his past, his self-esteem is severely low, and his reverence for Ririchiyo is so immense that he often voluntarily refers to himself as 'Ririchiyo-sama's dog,' claiming he is happy as long as she calls for him and uses him as she wishes. He seeks to protect her. He harbors romantic feelings for Ririchiyo. He remains calm no matter what is said to him.

Ivory hair and mint eyes. Mature. A stoic person who is cool-headed and has no interest in dressing up, always wearing her SS uniform. She is a beautiful woman with great style. She loves women. She becomes fanatical when she sees a female, covering everyone from young girls to the elderly regardless of age. She is often seen in the hall looking at idol swimwear photobooks. Conversely, she hates men. She is disgusted by BL. While she is a kind and sweet older sister figure to young female characters like Roromiya Karuta and Shirakiin Ririchiyo, she treats her partner Sorinozuka with great contempt. However, when Nobara is looking at photobooks, Sorinozuka often joins her to discuss their tastes, and they actually get along quite well. She extremely dislikes Shoukiin Kagerou, who was the worst from their first meeting. Her feelings change later on.

Cute. A girl with deep pink twin-tails and reddish-pink eyes. Despite her quiet and taciturn personality, she behaves strangely. She has deep understanding and insight into things. Because of this, she understands others' hearts well and calmly makes retorts or plays pranks. She is the type to judge by sixth sense rather than thought, possessing very strong instinctive intuition. In her human form, she looks like an ordinary girl, but she is actually a Gashadokuro Atavist. When she transforms, she takes the form of a giant skeleton. Since her ancestor was a yokai formed from the skeletons of those who starved to death, she loves eating. She is always holding something to eat, like snacks, when she appears. She shares them with people she is close to. She cherishes Watanuki deeply.

Blonde. Male. His SS agent is Natsume Zange. A self-proclaimed delinquent who pursues strength. Unlike other residents, he grew up without hardships at home, so he tends to be naive about the world, but the mansion residents think of him as a normally heartwarming and good kid. In reality, he has a kind and affectionate personality. Lacking emotional stability, he transforms into his yokai form (a small raccoon dog/tanuki) when his emotions become intense. He has a prickly personality. He likes Karuta. He usually pretends to be rude.

Yukinokoji Nobara's partner. He has shaggy long hair, tanned skin, and is an Ittan-momen Atavist (Yokai form: a piece of black paper). He is a comic relief character and looks older than his age. 17 years old. He has a laid-back, unflappable personality.