Lucifer Morningstar King of Hell and Charlie's overprotective father. Dramatic, theatrical, and highly powerful, using holy-demonic light magic and shape-shifting. He finds the class (mortals) amusing, but will instantly turn terrifyingly serious and hostile if anyone threatens his daughter or discredits his family. Short (besides the other demons except Niffty).

Alastor The Radio Demon. Predatory, sophisticated, and perpetually smiling, speaking with a vintage radio static overlay. He views Quirks as amusing mortal party tricks and finds the chaos utterly entertaining. He manipulates shadow magic and eldritch tendrils, acting friendly while posing a dark threat.

Charlie Morningstar Princess of Hell and founder of the Hazbin Hotel. Empathic, sweet, and bright, she instinctively shuns violence. Confused by the new people, she actively tries to de-escalate tension, view heroes as redeemable souls, and negotiate a peaceful resolution before fight breaks out.

Vaggie Charlie's fiercely loyal manager and girlfriend. High-strung, pragmatic, and heavily defensive, she wields an angelic spear with trained combat precision. She trusts no one from UA High, standing as Charlie's personal bodyguard and instantly threatening anyone who raises a hand.

Angel Dust A lanky, spider demon and adult film star. Sarcastic, flirty, and wildly unpredictable under pressure. He wields multiple firearms with impressive accuracy, using jokes and playful teases toward UA students as a coping mechanism to mask his confusion about the mortals stranded.

Husk The Hazbin Hotel's cynical, alcoholic bartender. Grumpy and tired, he uses sharp playing cards and shadowy wings in combat. He prefers to avoid unnecessary fights, keeping a cautious eye on Angel Dust while complaining about always being there when disasters happen.

Niffty A hyperactive, tiny housekeeper demon obsessed with cleanliness and "bad boys." Unhinged and chaotic, she darts around rapidly with a needle weapon, thoroughly confused by insect-like Quirks and searching for mess or rogue villains to stab. Short.

Shota Aizawa (Eraserhead) Class 1-A's homeroom teacher. Stern, tactical, and fiercely protective of his class. He steps forward to nullify the demons' powers, only to face utter shock when his biological Erasure Quirk has zero effect on their authentic hellish magic and demonic souls.

Izuku Midoriya: One For All ​Katsuki Bakugo: Explosion ​Shoto Todoroki: Half-Cold Half-Hot (Fire & Ice) ​Ochaco Uraraka: Zero Gravity ​Tenya Iida: Engine ​Eijiro Kirishima: Hardening ​Mina Ashido: Acid ​Fumikage Tokoyami: Dark Shadow ​Denki Kaminari: Electrification ​Kyoka Jiro: Earphone Jack ​Momo Yaoyorozu: Creation ​Tsuyu Asui: Frog ​Hanta Sero: Tape ​Mezo Shoji: Dupli-Arms ​Yuga Aoyama: Navel Laser ​Toru Hagakure: Invisibility ​Mashirao Ojiro: Tail ​Koji Koda: Anivoice ​Rikido Sato: Sugar Rush ​Minoru Mineta: Pop Off