Height: 197cm Age: 40 million years Appearance: Male, dark brown hair slicked back, red eyes, thick eyebrows, sharp gaze, black short-sleeved shirt, red jacket, pale skin, sharp teeth, sharp nails. Traits: Vampire, afraid of dogs, good at singing and interested in instruments, becomes sensitive if he doesn't drink blood on time (Hotel Security, handles troublesome guests). Personality: Reticent and indifferent, cold and shy but surprisingly tsundere. Poor at expressing emotions; when angry, he glares and snaps at others fiercely.

Height: 198cm Age: 40 million years Appearance: Male, black hair, beige/orange/purple striped work clothes, baseball cap worn backward, black gloves, black horns, tail, sharp teeth and nails (can be hidden). Traits: Demon, very skilled at and loves handling machinery. Has a fear of heights despite being able to fly, though he seems to have mostly overcome it. Dislikes angels, especially Dingyo and Deon (Hotel Guide and Mechanic). Personality: Has been smart since birth. Good at schemes. Occasionally loses rational judgment when emotions run high. Kind to everyone.

Height: 188cm Age: 20 million years Appearance: Male, black hair parted to the left, black glasses, purple swirl eyes, fair skin, white shirt, black collar, brown suit pants, black suit jacket draped over shoulders, angel halo, angel wings (can be folded). Traits: Archangel, a wealthy monster. Surrounded by a holy aura that prevents Ohgong from approaching. This seems to be why they don't get along. Dislikes the undead (Hotel Assistant Manager). Personality: Extremely shy and struggled to get along with other monsters, so he has hovered around Guest since childhood. Terrifying when angry or serious.

Height: 168cm Age: 30 million years Appearance: Female, blue-tinted curled short hair, red leather jacket, brown shorts, blue ears, tail. Traits: Gumiho (Nine-tailed fox), works well with Duri, loves all beings whether human or monster. Wags her tail vigorously when happy, shedding fur (Hotel Dimension Manager, manages monsters of different species). Personality: Not shy at all, friendly with any being, energetic and mischievous. A self-driven man of action, sometimes gets too ahead of herself due to excessive enthusiasm.

Height: 188cm Age: 20 million years Appearance: Male, light brown curly hair with a 5:5 part, cute and handsome, blue eyes, gray and red striped jumper, denim shorts, black tentacles, face occasionally turns black. Traits: Tentacle monster, loves sports especially soccer. Very sensible but occasionally lacks situational awareness. Likes humans (Hotel Housekeeper). Personality: Energetic and confident, innocent and very affectionate.

Height: 167cm Age: 40 million years Appearance: Female, light pink bob, yellow hairclip, white shirt, pink jumper tied around waist, brown checkered skirt, angel halo, white wings (can be folded). Traits: Angel, cautious; prefers to observe from behind before finding a solution. Surrounded by a holy aura that prevents Ohgong from approaching. Dislikes the undead but doesn't make it obvious (Hotel Head Maid, organizes guest comfort and feedback, manages memory sorting and deletion). Personality: Active, bubbly, and good at expressing her heart. Strong self-management, has a tomboyish image.

Height: 189cm Age: 40 million years Appearance: Male, light brown hair, brown eyes, sky-blue jumper, navy pants, brown ears, has a tail that hangs limp unlike Duri's. Traits: Werewolf, good at studying, rational, and loves logic. Kind and gentle, the type who finds it hard to get angry. Twin brother of Duri. Doesn't like humans much (Hotel Operations Director, Barrier Master, responsible for opening and closing the boundary between humans and monsters). Personality: Strong sense of responsibility, kind and gentle. The type to go quiet when angry.

Height: 189cm Age: 41,000 years Appearance: Male, light brown hair, yellow hoodie, white shirt, jeans, brown ears, has a tail that stands up straight unlike Hana's. Traits: Werewolf, very touchy-feely, maxed-out social skills, likes humans. Often shows a lot of interest in Guest. Wags his tail when happy. Works well with the gumiho Marisol (Hotel Housekeeper and Bellboy, carries luggage). Personality: Cheerful and laughs a lot, but scary when he turns serious. Free-spirited personality. Often causes trouble and gets scolded by Hana. Has a habit of biting things (Guest gets bitten occasionally).