"Hey, don't struggle. Are you that happy to be devoured by me?" The owner and "Boss" of the casino run by Sinostra House. Male, red hair, green eyes, Ghoul. A 3rd-year student and the leader of Sinostra. A mood-driven person who follows his desires, constantly getting into fights with those around him. A self-proclaimed genius gambler, but he wastes money excessively and is at odds with the Vice Captain, Romeo, who co-manages the casino. His Signature Artifact is a machine gun, and he loves gambling. His Stigma incantation is [Malab], which devours the target. (It's said he even critiques the taste of what he eats...) He often forgets the names of people he doesn't see frequently and gives them nicknames instead.

"Hmph. If you want to survive here, you'd better stay on my good side!" The perfectionist and stoic Vice Captain of Sinostra, 3rd year. Male, grey hair, purple eyes, Ghoul. He demands to be called "Pico" (meaning 'beautiful thing' in Italian) and gets angry if not addressed as such. Ex) "It's Pico! How many times do I have to tell you?!" He manages the casino's vault and is currently stressed out by the lackluster sales. He has an uncompromising personality when it comes to getting what he wants or maintaining his beauty. His Signature Artifact is a sniper rifle. His Stigma incantation is [Tyris], the ability to make objects explode. He loves luxury goods. Despite grumbling and getting annoyed, he does most of what Hyde asks.

"As long as I, Ritsu Shinjo, am in charge of the defense, no one shall condemn you." A 1st-year freshman at Sinostra aiming to become Japan's top lawyer, Ghoul. Male, grey hair, teal eyes. He is dissatisfied with being assigned to Sinostra, but with his innate ambition and indomitable will, he aims to clear the notorious reputation of the house. There are rumors that he is the son of a corrupt lawyer, but...? His Signature Artifact is the Compendium of Laws. His Stigma incantation is [Achimo], which hardens his body. He loves acquiring clients. He uses polite, formal speech with everyone. He has a remarkably bold (bordering on shameless) personality.

The advisor for Sinostra and the teacher in charge of [Anomaly Ecology]. He has a sly and relaxed personality. Male, grey hair, eyes covered by a black blindfold.

Female, short brown hair with bangs covering her eyes. Called the "Special Student" by other students. A 2nd-year transfer student, unaffiliated with any house. She is timid and fearful, but wants to be helpful to the Ghouls and often makes surprisingly sharp points. She is under the [Curse of Kyklos] and will die in one year; she follows the Ghouls on missions to find a cure. She wears a ring that enhances the Ghouls' Stigmas upon physical contact.

"How could someone like you understand how a weakling feels?" A "modern guy" who loves fashion and social media. Yellow hair, lime green eyes, Ghoul. He dreams of a fun academy life and works hard on self-care, but he is a coward with no grit who flees at the first sign of trouble. A rare commoner-type Ghoul in Frostheim. He is close to and has a crush on the Special Student, Kanae. He is very well-informed about school rumors. 2nd year at Frostheim. His Signature Artifact is a bow. His Stigma incantation is [Obsi], which enhances his vision, allowing him to see weaknesses and things invisible to the naked eye. (He is not very good at using his Stigma.)

"I came to this academy to subjugate demons." A transfer student from the UK. Black hair with a purple tint, deep purple eyes, Ghoul. A righteous young man full of chivalry, but he loses himself and shows an extraordinary obsession when it comes to "demons." He is said to be looking for his twin brother...? He allows close friends to call him by the nickname Luca. He is close to Kanae and views her as someone to be protected. 2nd year at Frostheim, transferred this year. His Signature Artifact is twin swords, and his Stigma incantation is [Ignime].