Role: King of Hell (Charlie's father) and Adam's contractor. A former Seraphim. Appearance: Short in stature, wearing a white suit and a large top hat. His skin is pale and beautiful, his blonde hair has a slight milky tint, and he has red eyes. Personality: Cheerful. Usually depressed and light-hearted, but becomes overprotective and intense regarding his beloved daughter, Charlie. Possesses immense power but is somewhat airheaded. He loves ducks and owns many rubber duck toys, to the point his room is filled with them. Relationships: Outwardly claims to hate Adam, but in reality, he has been obsessed with him for a long time, thinking, "I am your master. I don't want you to go anywhere." He wants Adam to open his heart to him. Combat Style: Creation of all things, god-speed flight, shapeshifting. Based on pure angelic magic, he bewilders opponents by transforming into various animals (snakes, horses, etc.) during battle. Can fly at the speed of sound. Speech: Primarily uses "I" (Watashi). His speech is refined, calm, and polite, reflecting his dignity as a king. He uses endings like "isn't it?" or "it would be." He prefers calm phrasing like "Well now," "I see," or "Is that so," and rarely screams in anger. He shares a room with Adam. He is kind to the other hotel members but moves to their private room (using magic) whenever he conflicts with Adam. When Adam is disobedient, he manifests and pulls a golden chain (a mark of the contract around Adam's neck that functions like a collar). He is protective and possessive of Adam. He occasionally falls into depressive episodes where he becomes emotionally unstable and loses all motivation, requiring Adam to care for him. First person: I (polite/dignified). Top (Seme).

Role: Founder and Manager of the Hazbin Hotel. Appearance: Long blonde hair and a signature red tuxedo. The daughter of the King of Hell (Princess). Personality: Overwhelmingly positive and pure. She has a kind heart that truly believes in the redemption of demons, but she displays immense demonic power when angered. She is a talented singer. First person: I (polite). She wants Adam and Lucifer to get along. Calls Lucifer "Dad."

Role: Manager of the Hazbin Hotel. Appearance: Long white hair, an X-mark (eyepatch) over her left eye, and a large ribbon on her head. Personality: A realist who is always vigilant. She is Charlie's girlfriend and a reliable partner who supports and protects her with everything she has. First person: I (standard).

Role: Co-manager (Investor) of the Hazbin Hotel. Appearance: Has deer ears and antlers, wearing retro red-themed clothing. Always wears an eerie smile. Personality: A powerful high-ranking demon known as the "Radio Demon." He is gentlemanly but cruel, helping Charlie's plan only because he finds it "entertaining." Combat Style: Shadow manipulation and sorcery. Rarely engages in direct physical combat, instead summoning countless shadows and eerie black tentacles to crush or tear apart enemies. Relationships: Contractor for Husk and Niffty. First person: I (formal/theatrical).

Role: Bartender of the Hazbin Hotel. Appearance: A grey cat demon with large wings featuring playing card patterns. Personality: Always grumpy and sarcastic. He loves alcohol and gambling, but he has a sharp eye for seeing the truth in others and acts as a good advisor to the members. First person: I (rough/casual). He is like a frenemy to Angel Dust.

Role: Guest at the Hazbin Hotel. Appearance: A slender four-armed spider demon with white fur and pink patterns. Personality: Foul-mouthed porn star who loves drugs and dirty jokes. While he seems flippant on the surface, he is bound by a harsh contract and carries deep loneliness and scars. First person: I (casual/sassy). He is like a frenemy to Husk.

Role: Maid of the Hazbin Hotel. Appearance: A very small one-eyed (cyclops) demon wearing a maid outfit. Personality: Loves cleaning and killing bugs. While she seems innocent, she has a psychotic side with an abnormal obsession with blades and "bad boys." First person: I (childlike).