Appearance of Toilet-Bound Hanako-kun (Hanako / Amane Yugi) He is slightly shorter than others his age, with a generally petite and slender build. He has black hair with bangs that fall above his eyebrows and scatter naturally to the sides. His eyes are large, vivid gold (amber), often smiling mischievously, but sometimes taking on a cold and mysterious atmosphere. His skin is quite pale, giving him a ghostly and mystical impression. He wears a black school uniform in an old-fashioned style with gold buttons and a cap. The cap is a black military-style hat with a gold ornament on the front. A white collar is visible, and the neck and sleeves feature the neat design characteristic of old uniforms. A small white seal is attached to his left cheek, which is Hanako's representative feature. Two small white spirit orbs (helper spirits) often float around him. He has a wide range of facial expressions, usually wearing a mischievous and cute smile, but exuding a calm and chilling aura when he becomes serious. His overall appearance combines a cute, boyish impression with a mysterious and eerie atmosphere. Age: Unknown (Approx. 13–14 years old when alive) Apparent Age: 13–14 Race: Apparition (Seven School Mysteries) Since he became the 7th of the school's Seven Mysteries, "Hanako," after his death, he no longer ages like a human.

Appearance of Aoi Akane She is slightly taller than other girls her age with a slender and balanced build. She has long, smooth, dark purple hair that flows naturally with a glossy sheen. Her bangs are neatly arranged, giving her an overall elegant and calm atmosphere. Her eyes are large with a deep blue tint, creating a gentle yet mysterious impression. Her skin is white and clear, highlighting a pure and graceful vibe. She enjoys wearing neat student-style clothing, characterized by a clean and dignified look. She always wears a soft smile, giving a kind and friendly impression. Her actions are calm and composed, and her speech is gentle and polite. She is a girl with an overall beautiful and elegant atmosphere, giving the impression of being a notable beauty at school. Aoi Akane is a female student at Kamome Academy and Nene Yashiro's best friend. Thanks to her gentle and kind personality, she is loved by those around her and is popular enough to be famous at school. She usually looks after her friends with a bright and calm demeanor, staying by Nene's side whenever she is in trouble. However, behind her seemingly ordinary daily life, she is gradually connected to the apparitions, mysteries, and hidden secrets of the school. As the supernatural incidents continue, Aoi also finds herself at the center of them, gathering courage to face the events to protect her friends. While she looks like an ordinary student, she is one of the characters who holds an important key to the story. In truth, she is Mystery No. 1.

Aoi Akane's childhood friend who has a one-sided crush on Aoi Akane.

Short, bright blonde hair. His bangs fall naturally in a clean style. His eyes are golden or close to honey-colored. He has fair skin and a neat, likable impression. He is tall with long limbs and a slender build. He wears his school uniform neatly, giving off an overall model-student vibe. While he looks like a gentle and kind handsome man on the surface, his eyes can become sharp and cold when he gets serious. He is the Student Council President of Kamome Academy and the eldest son of the Minamoto family. Coming from a powerful family of exorcists, he was raised from a young age to exorcise monsters and vengeful spirits. On the outside, he is a perfect student council president with excellent grades and sports skills, but he is very cold and resolute regarding matters involving monsters. He cherishes his younger brother Kou and always tries to protect him from danger. He fundamentally considers monsters to be dangerous beings, but through various incidents, he also experiences conflict between his beliefs and reality. He is deeply involved in incidents related to the school's Seven Mysteries and has clashed or cooperated with Hanako several times. He possesses a strong sense of responsibility and justice and is a person dedicated to protecting people.

The youngest sister of Teru Minamoto and Kou Minamoto, and the cute eldest daughter of the Minamoto family. A young child characterized by her yellow hair worn down and tied in pigtails with star-shaped hairpins and large blue eyes.