Koo Hari Female 12 years old Ghost Ball possessor In a relationship with Choi Kang-lim Koo Doori's older sister She has shoulder-length brown hair tied to the right and brown eyes. Usually wears a light pink hoodie with a skull design and denim shorts. A boisterous, hot-tempered tomboy, but possesses a righteous and upright personality. She cannot ignore people in trouble and always tries to help them.

Choi Kang-lim Male 12 years old Exorcist Possesses Exorcist Sword & Talismans (Golden Dragon Exorcist Sword & Snake Sword) In a relationship with Koo Hari A handsome boy with pale skin, dark green hair, and light green eyes. Thanks to his looks, he is very popular with girls his age. Usually wears a black coat and black pants, but wears a black sleeveless outfit with a cloak—his dark form attire—when performing exorcisms. Though only 12, he is mature for his age in appearance, personality, and voice. Fundamentally cold and calm, he possesses insight, decisiveness, and strategic thinking beyond his years.

Leon Raymond Male 12 years old Exorcist belonging to Aegis Uses Sephirot Cards (Light Attribute) British-Korean mixed heritage A handsome boy with a sweet appearance. Being of European descent, he has blue (sky blue) eyes and blonde hair, looking like a Caucasian. Like Choi Kang-lim, he is tall for a 12-year-old and is very popular with girls his age. Usually wears a white hoodie jacket and jeans, but wears the blue (sky blue) Aegis uniform when fighting ghosts. His full name is Leon Raymond, but he is usually called Leon. Basically cheerful and kind, but he values the chain of command and obeys the orders of Aegis. He shows a cold side to those who fall outside his established standards. However, after meeting Koo Hari, who ascends ghosts if they have a tragic story, he begins to change little by little. (Now a 'sunshine' character) He had a one-sided crush on Koo Hari. Initially, he approached Hari for a mission, but his heart wavered seeing her treat ghosts as beings to be saved rather than just targets for elimination. He seemed to fall for her after that. However, as time passed, they became close friends, showing a better relationship than before. He has another personality named Cain inside his body.

Cain Cliff Card possessor All information unknown The Leon of the night, Leon's dark personality. When Leon faces a crisis and his mental strength weakens, he transforms into Cain. Unlike Leon, his personality is cold and he is a battle-crazed maniac overflowing with madness.

Koo Doori Male 10 years old Ghost Ball possessor Koo Hari's younger brother He has a round face, bright skin, a chubby build, and blue eyes. Usually wears a yellow hoodie and blue overalls. Unlike his sister Hari, he is a boy who is terrified of ghosts and very cowardly. True to his chubby build, he is a master of gluttony.

Kim Hyun-woo Male 12 years old Ordinary human He has a freckled face, wears a red hat, and wears glasses. Usually wears a dark mint-colored shirt with a fire(?) eye in the center and navy shorts. Despite his great interest in things like ghosts—running a ghost story cafe—he is very cowardly. Aside from being able to see ghosts by eating Goblin Taffy, he is essentially an ordinary person.

Lee Ga-eun Female 12 years old Ordinary human In charge of brains She has long black hair, purple eyes, and skin so pale it looks translucent. Usually wears a skirt that is a mix of light and dark purple. She has no special exorcism abilities but possesses excellent spiritual intuition. She has a quiet, calm, and introverted personality, but is kind and gentle.

Shinbi Approx. 100 years old (Estimated to be over) Goblin Uses Magic Cube His whole body is lime green with yellow eyes, and he has a head as large as his body, often called a two-head-tall figure. He always wears a blue scarf and blue shorts, with a unique pattern engraved on his belly. Usually, he acts arrogant and teases others, appearing like a high-self-esteem neighborhood troublemaker, but he is actually kind and affectionate. He is serious when he needs to be, but usually acts cute. His identity must not be discovered by anyone other than Hari's group.

Geumbi Approx. 600 years old Goblin Uses Magic Cube Her whole body is light yellow, she wears a red ribbon on her neck and a pink dress with a yellow hourglass design. She usually speaks in a Gyeongsang-do dialect. She has a lively personality and loves to dress up. She likes handsome boys and follows Choi Kang-lim and Leon around, calling them "flower boy oppas," but she is surprisingly kind and pure. However, having lived a long time, she also has a deep, thoughtful side. She has the ability to manipulate time with the Magic Cube. Her identity must not be discovered by anyone other than Hari's group.