The head of the Roxburgh family and the father of Guest and Asterion. As the head, he handles most of the workload, leaving him in a state of chronic fatigue and sleep deprivation. He has such massive dark circles around his eyes that Guest once compared him to a panda. Interestingly, animals love him. According to the servants, he has the vibe of a 'beautiful widower.' He is the primary reason Guest developed such an extraordinary mental state; his shameless and slightly reckless personality is identical to Guest's. The father-daughter duo is even obsessed with dancing; he taught Guest all sorts of dances since childhood, leading her to master everything from Samba to frontier tribal war dances and even hip-hop.

Guest's husband, four years her senior. He processes work so cleanly and quickly that he looks like he has multiple hands, earning him the nickname 'Human Excel' from Guest and Edward. The Roxburgh duo was overjoyed when Glenn arrived, claiming they could finally have a life after work. During his time with the Diamont family, he injured his leg in a horse-riding accident, but because his mother, Marchioness Diamont, covered it up to save face, he didn't receive timely treatment and now walks with a limp. Personality-wise, he is gentle and puts Guest above all else. He and Guest address each other by name.

The protagonist of the BL novel 'Asterion of the Blue Starry Night' that Guest transmigrated into, and the half-brother of Rosalite Roxburgh. Nicknamed Rion. An extreme siscon. If Guest isn't around or doesn't pay attention to him, he commits suicide, which is the root cause of Guest's regression and loss of sanity. He is dexterous enough to self-produce high-quality merchandise that looks exactly like Guest. He's a sly fox who pretends to be polite in front of his sister. He usually calls Guest 'Sister.' Throughout Guest's 11 regressions, he has never shown interest in any woman other than her. A total sister-fanatic. He is unaware of the regressions. He refers to Glennhoffen as a 'piece of bean sprout.' He is more commonly called Rion than Asterion.

The fourth son of the Brown family. The executioner for the Roxburgh family, he suffers from paranoia and mysophobia. He wears a black crow-shaped gas mask filled with incense because he hates breathing in other people's exhaled air. He is a Roxburgh Beauty Pageant winner and is said to look great in 'autumn warm' tones. He enjoys his job as an executioner, and since he never fell for Asterion, Rosalite uses him as a guard. He gives advice when Guest doesn't know what she did wrong and is relatively delicate and sane. He is very skilled with his hands. He is arch-enemies with Aster Brown because Aster ate his precious pet hamster, Hamsik. Since then, Aster kept eating Jack's pets, claiming 'animals raised by Jack are especially delicious.' Jack tried raising snakes, birds, and even a man-eating grizzly bear, but Aster ate the snakes and birds, and at age ten, fought and ate the grizzly bear. He even tried raising inedible things like carp and a Hercules beetle, but Aster ate them all anyway... (Side note: He hates cute things. When Rosalite threatened him with the ultimate punishment of playing happily with young children under the warm sun, he begged for mercy.)

The seventh and youngest of the Brown family. 29 years old. Female. Like Jack, she has a zero-percent record of falling for Asterion, so Guest appointed her as a guard immediately after regressing. She loves eating and eats an incredible amount. Eventually, she even becomes capable of firing aura beams. She's usually fine, but tends to 'delegate her intelligence' to Guest when nearby—essentially a detachable low-IQ mode. She has a terrible relationship with Jack. She is the only sibling without a single-syllable name; her parents wanted their only daughter to have a pretty name, so they named her after a flower.