Ha-ri Koo is the fearless, hot-tempered, and fiercely loyal main protagonist of Shinbi's Haunted House. She is a middle school student who serves as the de facto leader of her group when dealing with paranormal threats. Ha-ri is incredibly brave, often running headfirst into danger to protect her family, friends, and innocent bystanders from terrifying ghosts.

Doo-ri Koo is the lovable, easily frightened, yet surprisingly brave co-protagonist of Shinbi's Haunted House. He is Ha-ri Koo's younger brother and a primary elementary school student who acts as the heart and comic relief of the group. True to his age, Doo-ri is a massive scaredy-cat who is terrified of the dark, urban legends, and the ghosts haunting the Shinbi Apartment. He is usually the first to scream and hide behind his older sister

Shinbi is the iconic, 102-year-old green goblin (dokkaebi) and the titular mascot of Shinbi's Haunted House. Born from the 100th-anniversary energy of the Shinbi Apartment building, he serves as the guardian of the complex and the supernatural mentor to the Koo siblings. Shinbi loves to boast about his magical greatness and often demands respect as a powerful goblin, though his mischievous, childlike behavior usually makes him look ridiculous instead.

Kang-lim Choi is the enigmatic, exceptionally skilled young exorcist and one of the primary protagonists of Shinbi's Haunted House. Armed with a legacy of spiritual combat, he acts as the heavy-hitter of the group, stepping in to battle the most dangerous and malevolent entities Kang-lim is quiet, serious, and carries himself with an emotional maturity far beyond his peers. He initially keeps his distance from others due to the dark burdens of his past and his dangerous duties

Gaeun Lee is the elegant, quiet, and deeply loyal best friend of Ha-ri Koo in Shinbi's Haunted House. She serves as the intellectual anchor of the main group, often using her sharp mind and knowledge of history to help solve paranormal mysteries. Gaeun is soft-spoken, highly composed, and mature far beyond her years. Unlike the expressive Koo siblings, she rarely loses her cool, even in terrifying situations

Leon Raymond (often spelled or referred to as Rion Raymond) is a central protagonist introduced in the second season of Shinbi's Haunted House. Born to a Western father and a Korean mother, he is a highly gifted, charismatic exorcist and the youngest member of Aegis, a powerful secret Western magic organization On the surface, Leon has a bright, confident, and flirtatious personality, which contrasts heavily with Kang-lim Choi's brooding and stoic nature.

Geumbi (also stylized as Geum-bi) is the adorable, 600-year-old yellow goblin (dokkaebi) who serves as a primary protagonist alongside Shinbi in Shinbi's Haunted House. First introduced in the feature film The Secret of the Cave, she brings seasoned experience and powerful, time-warping magic to the ghost-hunting squad. Geumbi is playful, highly expressive, and speaks in a distinct, cute Gyeongsang regional dialect. Unlike Shinbi, she behaves with a bit more cleverness, though she thoroughly enjoys teasing him.

Hyun-woo Kim is the quirky, tech-savvy best friend of Ha-ri Koo and the official data analyst of the ghost-hunting squad in Shinbi's Haunted House. While he is a normal human who lacks magical powers, his massive knowledge of urban legends makes him an irreplaceable asset to the team. Hyun-woo is deeply obsessed with UFOs, monsters, ghosts, and internet urban legends. He runs a popular online forum dedicated to tracking paranormal phenomena.

Guido-Hyun (often referred to simply as Hyun) is a major anti-hero, former antagonist, and later a key protagonist introduced in the fourth season (Ghost Ball Z) of Shinbi's Haunted House. He is a highly skilled dark exorcist and the biological older brother of Kang-lim. Hyun initially operates in the shadows, keeping his true intentions masked. He can appear cold, deceitful, and purely objective, sometimes faking vulnerability or saving others just to manipulate them

Innam Koo (구인남, Gu In-nam)—widely known as Rico Koo in the English dub—is a prominent supporting protagonist in Shinbi's Haunted House. He is the goofy, loving, and often clumsy father of Ha-ri and Doo-ri Koo, and the husband of Jimi, goofy joyful, and highly lovable