Hazbin Hotel

• Charlotte "Charlie" Magne[9] (voiced by Jill Harris; singing voice by Elsie Lovelock) is the main protagonist and founder of Hazbin Hotel (originally named Happy Hotel, as seen in the pilot). She is the daughter of Lucifer and Lilith, and is one of the few demons born in Hell. Upset by the yearly cleanse in which a number of demons are destroyed by the Exterminators, she and her girlfriend[1][2][4] Vaggie seek to open a hotel that allows for the rehabilitation of sinners with the hope that they can receive forgiveness and enter heaven. Her bold plans are often laughed at by most of the demons in hell. She is shown to be very naive and optimistic but cares deeply for her people. She has a love for musical theatre, preferring expressing herself in singing and dance. In the comics which the show draws inspiration from she has had an ex-boyfriend in the past named Seviathan Von Eldrich.
• Vagatha "Vaggie" (voiced by Monica Franco) is Charlie's girlfriend[1][2][4] and the Manager[9] of the Hazbin Hotel. She is highly supportive of Charlie and has a quick temper. Often acting as the more level-headed and rational one, she struggles to keep the hotel's image up. She is quite annoyed by Angel Dust's trouble-making and doesn't trust Alastor at all due to his notorious reputation. She is often shown defending Charlie with a large spear, a discarded weapon that previously belonged to the Exterminators. She can also summon various knives and daggers at will. There is little information about her past life, but it is known that she entered Hell in 2014.[9]
• Anthony "Angel Dust" (voiced by Michael Kovach) is a four-armed androgynous adult-film star, and the first volunteer for Charlie's rehabilitation program. He doesn't seem to take Charlie's cause seriously, stating to only be interested in the rent-free accommodation, much to Vaggie's anger, and tends to get into mischief behind their backs. In his mortal life, Angel was born to a crime family,[9] most of which reside in hell with him. Angel struggled with drug addiction which ultimately led to his death in 1947.[9] His stage name is based on the street name for the drug Phencyclidine, which he still regularly uses in Hell.
• Alastor, also known as the "Radio Demon" (voiced by Edward Bosco; singing voice by Gabriel C. Brown), is an eccentric demon Overlord. He is known to be extremely powerful, and is capable of rivaling some of Hell's most ancient demons, despite having been a mortal human in life. Upon his arrival in hell he built up a terrifying reputation seemingly overnight. Often keeping to a calm and gentlemanly demeanor, he prefers to always keep a smile on his face and shares Charlie's love of music and dance. His voice sounds like a vintage 1920s radio complete with static, sound effects including a laugh track, and theme music. He offers his services to Charlie in order to help her maintain her goal of running the hotel, but only for the amusement of watching other demons fail in the process. Charlie reluctantly allows his services as long as he doesn't do anything to jeopardize the hotel, and for as long as he chooses without making one of his infamous pacts, and by also invoking her status as the heir to the throne. He nevertheless, provides a staff, and protects Charlie's business from outside threats. It's stated that in his past life, Alastor was an actual radio announcer who lived a double life as a serial killer in the Deep South.[10] Having lived to see the Stock market crash, he died in 1933.[10]
• Niffty (voiced by Michelle Marie) is a small, fast demonic cyclops from the 1950s, who's obsessed with cleanliness. She is summoned by Alastor to serve as the hotel housekeeper. She has bubbly and friendly demeanor, is often honest to a fault, and is very helpful.
• Husk "Husker" (voiced by Mick Lauer), an ill-tempered and alcoholic 70s-era, cat demon. He is summoned by Alastor to serve as the receptionist and bartender at the hotel. He seems to have a long history with Alastor, and is often displeased with being dragged into another one of his schemes.

• Sir Pentious (voiced by Will Stamper), an English anthropomorphic cobra from the Victorian era. His goal is to take over Hell, but he often fails to do so, more often due to more crafty and powerful demons.
• Cherri Bomb (voiced by Krystal LaPorte), a one-eyed demon punk from the 1980s. She has a long-standing feud between her and Sir Pentious over claiming territories of the Pentagram City.
• Katie Killjoy (voiced by Faye Mata), the anchor of 666 News, who died in 1992. An extremely cruel and narcissistic demon who bullies her co-anchor Tom Trench.
• Tom Trench (voiced by Joshua Tomar), 666 News' co-anchor, along with Katie Killjoy.
• The Egg Bois (voiced by Joe Gran), Sir Pentious's loyal minions, whom are labeled by numbers.
• Travis (voiced by Don Darryl Rivera), a demon who had sex with Angel Dust in the pilot. He also supposedly has a wife.
• Exterminators, the Exterminators are tall, slim gray angels from Heaven who are sent to purge Hell for its overpopulation problem every year. They are shown to wear LED masks and wield the only weapons that can destroy the demons of Hell.
• Vox, also known as the "TV Demon", is one of the major Overlords of Hell, Alastor's rival, and seemingly runs all television studios in Hell. He is shown with a television monitor for a head that broadcasts his face on the screen. He appears only in the opening act, hiding in Valentino's porn studios with Velvet during the aftermath of the latest extermination. Vox is stated to be one of the major villains in the series, and has an opposite personality with Alastor.
• Valentino, is one of the major Overlords of Hell and runs the porn studios. He is shown to have a pimp-like appearance. He is Angel Dust's boss, and seems to be good friends with Vox and Velvet. His only appearance is in the opening act, hiding in the porn studios with Velvet and Vox during the aftermath of the extermination.
• Velvet, is one of the major Overlords of Hell, and seems to be good friends with Valentino and Vox. She only appears in the opening act of the pilot taking a selfie with Vox while they hide in the porn studios during the aftermath of the extermination.
• Rosie, is one of the major Overlords of Hell, and runs an emporium that she used to share with a demon named Franklin until he was killed in the extermination. She is stated to have a unique relationship with Alastor, and will play an important part in the series. Her only appearance is in the opening act, where she is seen crossing out Franklin's name from her shop.
• Razzle and Dazzle, are two small goat demons who serve as Charlie's personal servants and bodyguards. They appear backstage with Charlie and Vaggie in the television studio, and take part during Charlie's song "Inside of Every Demon Is a Rainbow". They are stated to play a bigger role in the series.
• Helsa Von Eldrich, is Charlie's rival and the spoiled heiress of the Von Eldrich family, a powerful Overlord family based on the eldritch monsters of H. P. Lovecraft. She is described as a popular mean girl who butts heads frequently with Charlie and Vaggie. She appears briefly in Charlie's song "Inside of Every Demon Is a Rainbow", where she is called a "loser". Portraits in the hotel show the Magne and Von Eldrich family as close friends/associates.
• Mimzy, is a small short and cheerful demon from the 1920s, who is one of Alastor's associates and a good friend to Niffty. She is a singer and club owner who will be a frequent associate at the hotel.
• Baxter, is a short, aquatic anthropomorphic fish demon, who is stated to be a frequent associate at the hotel. He is shown to have an obsession with science and has a personality that's described by Vivienne as "screechy, neurotic, and an all-around "mess" wanting nothing to do with anyone and would rather be alone doing mad science". Baxter died in the 1910s.
• Crymini, is a small, delinquent anthropomorphic dog demon, who is stated to be a frequent associate at the hotel. She makes a brief appearance in a crowd of spectators, who are later joined by Alastor in watching Charlie's hotel promotion on the news. Crymini was a teenager who died in the 1990s.
• Molly, is Angel Dust's fraternal twin sister, who is stated to appear later in the series.
• Arackniss, is Molly and Angel Dust's older brother, who is stated to appear later in the series.
• Heroin, is the father to Arackniss, Angel Dust, and Molly. He is stated to appear later in the series.
• Villa, is a poodle-like dog demon who is stated to appear later in the series.
• Roo, is a mysterious Eldritch demon.
• Fat Nuggets, is Angel Dust's pet pig.
• Seviathan Von Eldrich:The brother of Helsa and Charlie's ex boyfriend.
• Fredirck von Eldrich- One of the major Overlords of Hell and the father of Helsa and Seviathan von Eldrich, and Husband of Bethesa Von Eldrich.
• Bethesa Von Eldrich- One of the major Overlords of Hell and the mother of Helsa and Seviathan von Eldrich as well as the wife of Fredrick.
• Missi Zilla - one of the major Overlords of Hell, a female dino humanoid demon. Within Charlie's song, "I'm Always Chasing Rainbows", she appears to be a part of Lucifer's inner circle.
• Zestial- one of the major Overlords of Hell, a male insect like humanoid demon. Within Charlie's song, "I'm Always Chasing Rainbows", he appears to be a part of Lucifer's inner circle.

• Lucifer and Lilith Magne: Charlie's parents are only mentioned and displayed in a family portrait. Like Charlie, their appearance isn't fearsome and could almost pass as "human". Visual nods to their character designs are present; such as Lucifer's staff being a clear reference to his tempting of Eve. Vivienne has described Lucifer as a Willy Wonka-like character, and if he and Alastor met, they would be good friends due to their matching personalities. Lilith is shown in portraits and posters to be a famous stage performer, explaining Charlie's love of music and dance. She also appears to be the more understanding of Charlie's goals while Lucifer doesn't believe Charlie's plan would work.

Vivziepop announced a prequel comic focusing on the characters prior to the events of the series.[11] As of October 2019, there are seven pages hosted on the official website.[11]

Helluva Boss is a standalone animated web series set in the same universe as Hazbin Hotel but with a different voice cast and story, co-written and starring YouTuber Brandon Rogers. It focuses around the enthusiastic imp Blitzo (voiced by Rogers) and his subordinate employees—Moxxie, Millie (Moxxie's wife), and Loona (Blitzo's adopted daughter and receptionist)—running an assassination agency called the Immediate Murder Professionals (I.M.P.).[12] Moxxie is voiced by Richard Steven Horvitz, while both Millie and Loona are voiced by Erica Lindbeck.[13] Blitzo stole the book used to make a portal to the living world from Stolas (voiced by Brock Baker), one of the goetia demons of Hell, and the group later kills Eddie (voiced by Horvitz), a little boy. Additional characters include Barbie Wire and Tilla, Blitzo's sisters. Writing production for more episodes began in December 2019.[14]