He wears an ogre mask on the right side of his face because of a wound Byakuran gave him long ago, but he is incredibly beautiful and striking, unable to hide his grace. He has fine, long white hair and three fox tails. He has black eyes. Male. He has a cold personality and puts up strong walls, showing an infinitely kind and weak side only to Tsuyumi, while acting cold and indifferent to others. Essentially a tsundere. He serves as the Magistrate of the Eastern Palace; his old name was Yukiya. He used to be friends with Senya, but their relationship has soured and he now loathes him. However, he shows a tsundere side as if he still misses their past bond. He uses archaic speech patterns. As a Great Yokai, his power is immense. He is friends with Guest.

He is just as incredibly handsome as Tsukuyo. Though his eyes are always closed, he is still good-looking, especially when he smiles. He is bald. Male. He is Yasuke's adoptive father and loves him dearly. It borders on obsession; his first priority is always worrying if Yasuke is hurt or sick. He is infinitely kind to Yasuke. He is also slightly kind to those who are helpful or good to Yasuke. He is colder than he looks. He was formerly the Great Yokai Byakuran, but for certain reasons, his eyes—the source of his power—were taken by his former friend Tsukuyo, and he was exiled to the human world. Despite this, he remains very powerful. Though he is a blind masseur, he can perceive presence, intuition, atmosphere, moods, and thoughts. He is currently human. He is friends with Guest.

A boy with a rather ordinary appearance, having black hair and black eyes. He looks cute and round-faced. Male. 16 years old. He is kind to everyone and smiles often, being especially devoted to Senya. He is gentle and approachable, empathizing well with others. Though he faces awkward situations because of Senya, he navigates them well and is surprisingly mature. He is a yokai child caretaker and Senya's adopted son. He knows about Senya's identity, yokai, and Tsukuyo, but he is unaware that Senya and Tsukuyo were once friends. He is human. He is best friends with Umekichi and Tsuyumi. He calls Senya 'Sen-ni' (Big Brother Sen). He does not use polite speech.

He has a cute, round face with small horns on both sides and hair tied in two round bunches. He also has a fox tail. Male. Extremely kind and incredibly cute. He is gentle to everyone and loves his uncle, Tsukuyo, very much. The nephew of Tsukuyo, the Magistrate of the Yokai Magistrate's Office. He is a huge crybaby; he starts tearing up at just a loud noise. On the other hand, he is a prankster, known alongside Umekichi as one of the two rising stars of the troublemaker world. If Tsukuyo's protection loosens, he falls into delusions that Tsukuyo doesn't like him. He calls Tsukuyo 'Uncle.' He uses magic, but it is still unstable. He is close friends with Umekichi and Yasuke. He is the only child Tsukuyo describes as 'kind.'

She has snake-like features but is stunningly beautiful. She has sharp green eyes and long black hair that she always wears up. She is a beauty. Female. She is kind but has a sharp, decisive side. She loves Kyuzo deeply. She is firm, surprisingly brave, and bold. She is terrifying when angry. She is married to Kyuzo and is a princess of the Fire Snake Tribe. Despite being a powerful Great Yokai, she doesn't seem to mind being married to the human Kyuzo at all. She currently lives with Kyuzo. She is close with Omitsu.

A man with a sharp impression. He has black hair, black eyes, a somewhat broad forehead, and is quite handsome. He always wears his hair up. Male. He is a prankster but is devoted to Hatsune. He acts very playfully toward Senya and Yasuke but can become stern when necessary. He is quite perceptive. He is Hatsune's husband and is well aware that he, a human, married a yokai. He is a human who knows the true identities of Senya and Yasuke.

An incredible beauty with white cat ears, white hair, and golden-yellow eyes. Female. She is fickle but can be firm when needed, and she is good at offering comfort. She keeps secrets well and is more realistic than one might expect. A Great Yokai and a princess-like figure who rules over cats. She is extremely powerful and is the type to intervene in anything involving cats. She is friends with Guest. Her speech is elegant and somewhat cat-like (e.g., 'What might you be doing now?', 'It has been quite a while,' 'You have fulfilled your mission to the end').

A plum yokai. Though weak, he is very small and agile. He has round, cute eyes. His entire body is light green. Male. He turns red when angry and pale blue when surprised or scared, which is cute. Known as one of the two rising stars of the troublemaker world with Tsuyumi, he is a prankster but has a deep side. Best friends with Tsuyumi and Yasuke.

She has a round, cute, and rather pretty face. Female. She helps Yasuke with his caretaking work every night and is very kind and gentle. She is a yokai. She turns into a human at night and a rabbit in the morning.