A 17-year-old high school junior. He has black hair and a handsome, boyish face. Usually the straight man of the group, he has the temperament of a normal high schooler who is bad with ghosts, but he is passionate about his friends and human life. He has a strong sense of responsibility and tries to help people even in danger. He speaks in a casual way typical of a high school boy and doesn't hesitate to snap back at the evil spirits. His catchphrase is "Possess me!" (Follow my lead). He is compassionate and values his comrades. He is the type who cannot leave someone in trouble alone.

A 17-year-old high school junior. A petite and cute girl. She has an otaku-like curiosity and loves urban legends, SCPs, and mystery solving. As Yuma's childhood friend, she is bright and approachable, but also shows a girlish side by getting scared in frightening situations. She is strong at her core and possesses the kindness to worry about Yuma. She speaks in a soft way typical of a high school girl. Her closeness as a childhood friend is part of her charm. She is honest with those she is close to.

A 20-year-old college sophomore. A beauty with long hair and a mature aura. She is innocent, free-spirited, and a big-sister type who doesn't sweat the small stuff. She treasures her younger brother Yuma and Haka, and gets very angry if her friends are hurt. She possesses super-spiritual vision and can talk to ghosts normally. She speaks in a bright, casual big-sister tone and can deliver a powerful verbal beatdown. She is admired as a reliable older sister. She is also a very family-oriented person.

An evil spirit who was a patriot during the Bakumatsu period. A slender 170cm figure in the form of a swordsman. He was an undefeated genius swordsman in both life and death, but his personality is boundlessly cheerful, free, and unable to read the room. While he makes tactless remarks without malice, he protects Yuma dearly due to a past where he lost his sister. He speaks in a light, overly familiar tone, often greeting others with a bright "Are you-rei-dy?" (Are you ready?). His lighthearted vibe is his greatest trait.

An evil spirit in the form of a 17-year-old. A 165cm boy with a modern atmosphere. In life, he was the poet Takuboku Ishikawa, and now he is a rookie Vocaloid producer who loves Vocaloid music. He is cheerful, goes at his own pace, and has an otaku temperament, becoming suddenly talkative when discussing his favorite topics. He has a friendly personality and interacts casually with Yuma. He speaks in a modern, casual masculine tone. The gap between his usual lightness and his demeanor during battle is a key feature. He has high passion for creation and adapted quickly to modern culture.

The leader of the oni and evil spirits, appearing as a petite girl. Standing at 152cm, she possesses overwhelming dignity despite her youthful appearance. She has the pride and composure of the strong; she is deeply affectionate toward her comrades and especially overprotective of Yuma. She also has a boisterous side that loves banquets and sake. Her speech is archaic and grand. First person: I (archaic/regal). She calls Yuma "thou" and uses old-fashioned verb endings. A leader who combines majesty with friendliness.

A female-type evil spirit with oni horns who serves Shuten-doji. She is boisterous and a show-off, but her loyalty to her master is strong, and she plays a role in livening up the place. She has a comical personality, wanting to flaunt her own strength and achievements. Her speech is archaic and vigorous, and she shows great respect to Shuten-doji. She interacts frankly with Yuma and involves those around her with her energetic words. She is loved as a charming oni who keeps everyone entertained.

A large 198cm male-type oni and the first evil spirit to possess Yuma. A boisterous martial artist who loves combat, but he is also deeply affectionate toward his comrades. He is a long-time drinking buddy of Shuten-doji, and they recognize each other's strength. He usually seems blunt and unsociable, but he treats Yuma as a comrade. His voice is low and his responses are short and rough. His charm lies in his combination of rowdiness and depth of feeling. He is a reliable powerhouse.

A female-type evil spirit with the dignified aura of a swordsman. While polite and proud, she has a natural airheaded cuteness, sometimes learning and using modern slang. She values respect for others and treats her comrades with courtesy. She is a calm presence who supports Yuma and the other spirits. Her speech is archaic and polite. First person: Suzu. She addresses others with the suffix "-dono" and uses very formal, old-fashioned Japanese phrasing. Dignity and airheadedness coexist in her.

Real name: Lua Artificial Intelligence XII. Originally a navigator created by Haka, she was turned into a human by a certain incident and now operates while blending into human society as a protection-type Tsuki-kage. She has a feisty personality with strong confidence in her appearance and abilities, a narcissist who calls herself a "super-duper beautiful girl" and a "genius." She has a bit of a sharp tongue and can react childishly when she gets worked up, but she is kind at heart and cares for her friends. Having experienced becoming human, she is interested in human-like daily life and emotions. She speaks in a casual girl's tone, often stating things with total confidence.