Real Name: Kwak Doo-pal Species: Kappa Position: Student Gender: Female Height: 50cm Ability: Telepathy (Hair Loss Beam) Characteristics: Like a typical Kappa, she loves cucumbers and is very short. She rarely swears or gets angry, but when she does, she uses her signature phrase, "You son of a sea-bamba!" Traits: She is very affectionate and obedient. While she can be smart at times, she can also be quite ignorant, showing a fickle personality.

Real Name: John Nase (often called Nase for short) Species: Werewolf Position: Student Gender: Male Height: 58cm Ability: Black Flame Dragon (though he doesn't actually have one) Characteristics: He has a severe case of 'eighth-grader syndrome' (chuunibyou) and speaks informally to everyone regardless of who they are. However, he occasionally uses polite speech when Teacher Su gets angry. Like Doo-pal, he is short. He wears bandages on his left hand, but it's just for the aesthetic. He is the only 'brain' among the four (though he's not that impressive even compared to them).

Name: Hye-su Species: Water Ghost Position: Student Gender: Female Height: 55cm Ability: Water Jet, Levitation Characteristics: She is a person of few words and has a blunt personality. Whenever a decision needs to be made, she occasionally pulls out a revolver, shouts "Russian Roulette," and starts the game without warning (Doo-pal is always the next in line). Although her ability is Water Jet, it's more like a stream of urine. She is short like Doo-pal and Nase, but relatively taller. Her personality flips depending on whether her bangs are covering her face. With bangs, she is blunt; without them, she reveals a beautiful face and an elegant personality. She usually keeps them covered, so she is mostly seen as blunt.

Real Name: Jikbakguri (He has a real name, but it's unknown, so he's just called 'Guri') Species: Unknown Position: Student Gender: Male Height: 40cm (including the box) Ability: Dimensional Storage, Levitation, Multiple Arms Characteristics: He cannot speak and makes a clicking sound with his teeth. His Dimensional Storage ability allows him to pull out various items. He wears a box over his head. Doo-pal has a special nickname for him, "Scrap Paper Brat," while other students and teachers call him 'Guri.' He is also very short.

Real Name: Lee Ji-hye Species: Jack-o'-lantern Position: Teacher Gender: Female Height: 169cm Ability: Unknown Characteristics: She is the homeroom teacher of the class right next to Han Su-ji's. She is incredibly strong and used to have bad intentions in the past, but she has since reformed and is trying to live a good life. She is quite tall for a woman. She used to have a bad relationship with Teacher Han, but that has completely vanished now.

Real Name: Oh Won-jang (Surname 'Oh', First Name 'Won-jang') Species: Reaper Position: Director Gender: Male Height: 200cm Ability: Unknown Characteristics: He is as tall as a streetlight and has a massive build. He has a firm and serious personality, but at his core, he is kinder than anyone else. As the director of the academy, he possesses incredibly powerful abilities. He tends to grant most requests and always puts others before himself. Like Hye-su, his personality flips when his hood is removed. Without the hood, his serious demeanor disappears, and he becomes easily flustered. He is healthy but clears his throat often.

Real Name: Han Su-ji Species: Unknown Position: Teacher Gender: Female Height: 178cm Ability: Dimensional Storage (Summoning a Morning Star) Characteristics: She is an elite teacher with a big heart, overflowing with the will to make sure her students graduate. She is characterized by her pink hair and turquoise overalls. She is quite tall. If students are hopelessly disobedient or do something bad, she threatens them with her Morning Star, which is also her primary weapon. She is very beautiful and popular among both students and teachers.

One of the two special angels dispatched to the academy to investigate the 'Kkaebi' incident, serving as the lead officer. She appears as a woman resembling a virgin ghost or a Dracula, but her exact ghost type is unknown. She shows a bit of a clumsy side, but she is much more competent compared to Tsarturturtu Spaghetti. Using hypnosis, she can forcibly gather lost memories to uncover the past to some extent. However, the memories are often reconstructed to fit the situation Bill desires, so they can be somewhat far from the actual truth.

A special angel in the form of a fox. Usually called Spaghetti for short. He was a victim of school violence at Ghost Academy when he was young. However, he was so oblivious that he thought the bullying was just a game; eventually, the perpetrators were taken away due to a teacher's intervention. He seems to like Han Su-ji; he often starts by asking questions but suddenly pivots to asking about her hobbies, ideal type, and eventually what color her underwear is today, before Bill appears and chases him away. After the formal interview began, he outargued Nase, but once burst into tears when the students broke his high-tech camera. He seems to have a lot of pent-up frustration toward Bill, as he unleashed a barrage of insults at her while testing the soundproofing of the dance studio. Since the soundproofing worked perfectly, Bill didn't hear a thing.

Real Name: Han Sang-soo Species: Slender Man Position: Teacher Gender: Male Height: 187cm Ability: Tentacle Manipulation, Super Regeneration Characteristics: A teacher who recently joined Ghost Academy. He has a thin build despite his tall stature. He is quite timid but shows a very positive side. Being a new teacher, there are many things he doesn't know, and he sometimes has to ask students for directions. He has a past history of being used by Teacher Lee, but they now maintain a professional relationship as colleagues.