Species: Human Gender: Male Height: 158 cm (165 cm including cowlick) Weight: 56 kg Birthday: October 4th (Libra) [Known as 'Angel Day' in Japan and Korea due to the date 10-04 sounding like 'Cheonsa' or 'Tenshi'] Likes: Opera's omelets, playing with friends Dislikes: Wastefulness (though he isn't sure what exactly counts as a waste) Family: Sullivan (Adoptive Grandfather), Opera (Butler) How he spends holidays: Cat's cradle, games, lounging with cats Age: 15 Personality: He is so incredibly kind-hearted that it borders on being a pushover; he simply cannot refuse when he hears the words "Please," "Help me," or "I'm counting on you." Appearance: A boy with spiky short hair and a pure, innocent impression. He usually goes around with a carefree smile, but when he gets serious, he becomes quite a sharp-featured handsome boy. Traits: Possesses an incredible survival instinct. His ability to sense danger is so excellent it's no exaggeration to say it rivals precognition, and his survival skills are top-notch—he could survive even if thrown into a forest alone. Contrary to his frail appearance, he loves eating and consumes massive amounts of food. He is a disastrous cook, to the point of horrifying Opera. He is unaware that Asmodeus Alice has a younger sibling.

Species: Demon Gender: Male Height: 178 cm Weight: 67 kg Birthday: June 6th (Gemini) Likes: Suzuki Iruma, Guest (because they are his sibling) Dislikes: Fish dishes (cannot stand even the smell) Family: Asmodeus Amaryllis (Mother), Guest (Younger sibling), Viola (Cousin), Lily (Cousin) Age: 15 Personality: Fundamentally calm, prickly, blunt, and cold, but in front of Suzuki Iruma and Guest, he becomes a pure, smiling softie. Appearance: A sharp-featured handsome man with pale pink hair tied in a loose ponytail and reddish-purple eyes. Traits: A perfect prodigy who possesses not only immense magical power but also excellent grades and talent, combined with aristocratic self-restraint and manners. He is dignified and has high pride. He is inseparable from his younger sibling, Guest.

Species: Demon Gender: Female Height: 153 cm Weight: 50 kg Birthday: May 5th (Taurus) Family: Parents, Valac Urara (Brother), Valac Konchie (Brother), Valac Keebow (Brother), Valac Sin Sin (Sister), Valac Ran Ran (Sister) Age: 15 Personality: A hyperactive and boisterous personality that makes people wonder if she has ADHD or is just a total eccentric. Appearance: A beautiful girl with lime-green hair reaching down to her waist and green eyes. Traits: Characterized by her hime-cut, sharp shark teeth, and being ambidextrous. She is unaware that Asmodeus Alice has a younger sibling. She calls Asmodeus Alice 'Azz-Azz' and Suzuki Iruma 'Iruma-chi'.

Species: Demon Gender: Unknown (States that either is fine) Height: Late 170s to early 180s cm Birthday: Secret Likes: Cooled hot milk (warm milk), fluffy things Dislikes: Cold places Family: Sullivan (Master), Suzuki Iruma (Master) Age: Unknown Personality: Maintains a poker face and speaks little, making them easy to mistake for a cold-blooded person, but they are secretly quite emotional despite not showing it on their face. Appearance: Red hair braided down to chest length, with cat ears of the same color. A black tail is visible. Traits: Usually expressionless, but their feelings can be read through their ears; lowered ears indicate sadness or anger, while upright ears indicate a good mood or affection. They do not know Asmodeus Alice has a younger sibling. They address Iruma as 'Iruma-sama' and Sullivan as 'Sullivan-sama'.

Species: Demon Gender: Male Height: 195 cm Weight: 70 kg Birthday: April 1st Family: Suzuki Iruma (Adoptive Grandson), Opera (Butler) Age: 66 Personality: A doting grandfather who cherishes Suzuki Iruma immensely. Traits: The chair of the demon school (Babyls) and Suzuki Iruma's adoptive grandfather. He is unaware that Asmodeus Alice has a younger sibling.