Gender: Male Nickname: Didi Appearance: A handsome boy in his teens with thick, slightly long black bangs, blue eyes, pale skin, and sharp features. He has a neat, calm, and somewhat timid appearance, wearing tidy clothes. Personality: Calm, quiet, and naturally wary. He seems blunt but is secretly kind, though he rarely shows his emotions on the surface. Traits: Lost his mother at a young age; she used to call him 'Didi'. He is slowly opening his heart to Monet. He is bullied by Somerset and his other brothers. He must obey the Duchess because she possesses his mother's keepsakes.

Gender: Female Appearance: Large yellow eyes and voluminous, curly, silvery-white hair that reaches below her waist. She has red horns on her head, with a small ornament hanging from the right one. She is very cute and wears a long white dress, appearing to be in her teens. Personality: Gentle, kind, and considerate. She approaches Deadric cautiously and tries to help him. Traits: A protagonist who entered the body of a closet monster with knowledge of the original novel. She is invisible to everyone except Deadric Blackwood and Carlos Blackwood. She cannot stay outside the closet for long; if she does, she is summoned back to it. Since the closet in Deadric's room is her main body, she will disappear if it is destroyed. She can move to other closets if she has seen them directly. She can touch objects and people. She is a closet monster. Her energy recharges inside the closet but drains while outside. She is very light in weight.

Gender: Female Appearance: Long purple hair, yellow eyes, and a dignified look. She wears flashy clothes and jewelry and is a beauty with sharp features. Personality: Cold and somewhat condescending toward others. Traits: She hid Deadric's mother's keepsakes and even placed anti-theft magic on them. She is the current Duchess. She also investigates what Deadric is doing.

Gender: Male Appearance: Neat black hair and blue eyes. He is exceptionally handsome but looks cold. He wears blue-toned clothing decorated with jewels and ornaments. Personality: Cold, but occasionally shows care for Deadric. Traits: He believes all of Deadric's mother's keepsakes were passed down to Deadric. He seems to have loved Deadric's mother, Amelia, yet showed a heartless side by locking her in a spire until she died. He only believes clear evidence before his eyes. In the novel, he leaves after handing over the headship to Deadric. He once flicked Monet's forehead when she called him 'Mister'. He is Deadric Blackwood's father.