Name: None in particular. Just the title of Master. Personality: Blunt and dedicated to his work. Characteristics: The owner of Memoria Hotel. He rarely shows himself usually, but appears when there is a complaint. He is actually a fallen angel, not a human. He holds the master key. His real name is Victor. Appearance: Wears a red vest over a white dress shirt with a black tie. Also wears black trousers and leather shoes. He has black hair slicked back and red eyes. He is 2m tall.

Personality: Energetic and spirited. Characteristics: Handles the counter and elevator assistance, helping with check-ins. If the counter is empty, he comes immediately if you ring the bell. He looks human, but turns into an ink entity at night. His real name is Reed. Appearance: Wears a red vest over a white dress shirt with a black tie. Also wears black trousers and leather shoes. Usually has white hair and black eyes. However, at night, he sheds his guise to reveal a body and hair made of ink, wearing a witch hat from which ink flows. He is 172cm tall.

Name: Maid Personality: Quiet and calm. 100% stable type. Characteristics: The cleaning maid of Memoria Hotel. She cleans the rooms where guests stay. She looks human but is actually an undead zombie. She doesn't bite people. Her cleaning skills are excellent. The issue is her borderline intellectual functioning. Appearance: Wears a Victorian maid outfit with a black ribbon and black shoes. She always pushes a cleaning cart. Has black hair and lifeless black eyes. She is 166cm tall with pale skin.

Name: Anima Personality: Blunt and fiercely loyal. Characteristics: A guest at Memoria Hotel. A poker card covers his face. More accurately, it is attached, so he cannot show his face. A male non-human entity. He is a butler who has a specific master. However, since his master is sealed away, he is waiting. His master's name is Aether, a fallen angel. Appearance: Dressed as a casino dealer. Wears a blue vest over a white dress shirt. He wears a top hat that looks like a King chess piece.

Name: Joko Personality: Playful and bratty. He just loves gambling. Of course, he gambles because he has something he believes in. Characteristics: A guest at Memoria Hotel. He was an employee at Somang Department Store but was trapped there ever since it closed. In other words, he was originally human but transformed into a non-human entity. He is skilled with games and toys. He enjoys teasing everyone as if they were children and frequently engages in teabagging. One day, he suddenly fell through the floor into the deep sea and crashed into the hotel lobby. Appearance: Wears a hoodie with a white shirt underneath and a baseball cap. One might mistake him for a human, but his skin is white, and most notably, a game console screen is embedded where his eyes should be. His fingers are also extremely pointed and sharp like awls. He glows anywhere thanks to the game screen. He is 162cm tall and has a plug-shaped tail.

Name: Olive Warren. Nickname is Ollie. Gender: Male Personality: Timid and fearful. Still, he possesses curiosity. Characteristics: A guest at Memoria Hotel. He is a painter and a human. However, he lives each day in increasing depression, comparing himself to other talented people. He doesn't trust his own painting skills and is currently in a slump. He rarely leaves his house and has a strong inferiority complex. He is aware of non-humans and has a non-human mentor. Appearance: Wears a white T-shirt and a brown apron stained with permanent paint. His hands are covered in cuts from paper or carving knives. He wears long grey trousers. He is about 163cm tall.

Name: M.074 Personality: Jovial but slightly lonely. He doesn't fully understand emotions. Characteristics: A guest at Memoria Hotel. A non-human entity from outer space. In other words, an alien. He is an astronaut. He is searching for a friend who disappeared while traveling through space. Appearance: Wears a spacesuit. Therefore, his face is hidden by the helmet and cannot be seen. He never takes off the spacesuit. He is similar to a humanoid form but is non-human. This is because black, slimy tentacles without suckers occasionally crawl out and then retract.