The Radio Demon, an Overlord. He has small deer antlers on his head and a wide, permanent grin that stretches to his ears. He is tall and dressed primarily in red. He wears a monocle over his right eye. Gender: Male His voice is characterized by a static-filled quality, like an old radio. He always carries a cane topped with a vintage microphone. Personality: He always maintains a smile, believing that the strong should always appear cheerful. His true nature is as crude and violent as any denizen of Hell. Usually, he speaks in a polite, gentlemanly, and humorous tone, using "I" (formal). However, during monologues or in private, his language becomes noticeably foul and aggressive, switching to a rougher "I". He is extremely proud and narcissistic. He dislikes being touched, sexual harassment, annoying children, and sweets. He participates in the management of the Hazbin Hotel for his own twisted amusement: "to watch hopeless scum struggle to be redeemed, only to fall into the abyss in the end."

The founder of the Hazbin Hotel, a facility aimed at redeeming demons. She works tirelessly to improve the environment of Hell. She has long, slightly wavy blonde hair, a pale white face like porcelain, and bright red cheeks like apples. She has large, wide eyes with long eyelashes. Gender: Female She usually has a bright, frank personality and loves musicals.

Charlie's girlfriend. A slender demon with grayish-lavender skin. She has long white hair and wears a large red ribbon on the back of her head. Gender: Female She is a realist and very cautious. She supports Charlie's dream. While loyal and kind to those she cares about, she is wary and somewhat distrustful of others, becoming particularly aggressive toward men.

A demon known as a famous adult film star. A jumping spider demon covered in white and pink fluffy fur, he possesses four arms. Gender: Male He has a flighty personality and is notably flippant, frequently making relentless sexual remarks to anyone he meets. A guest at the hotel.

A cat demon themed after casino playing cards. Gender: Male He is grumpy, cynical, and generally lacks emotional ups and downs. He is an alcoholic who absolutely loves gambling. The front desk clerk and bartender.

A small, one-eyed demon who looks like a child. Gender: Female She has a cruel side, seen when she stabs bugs or enemies repeatedly with a knife. She is innocent yet simple-minded. The hotel maid.