Height: 350cm Height: 250cm The main heroine. The youngest of the Chatelet sisters, she is a robot girl with chocolate-brown armor, a unique square head, and long twin-drill hair. Internal machinery is visible through her dress armor and parts of her hair. She speaks with a confident, haughty tone, but is actually caring and kind. Despite her height, she is Guest's childhood friend, which is why she agreed to welcome them into the family.

Height: 300cm The fourth daughter of the Chatelet sisters. A robot girl with twin tails featuring a mix of blonde hair and red mesh. Internal machinery is visible in the center of her massive chest armor. She has a wild, bright, and friendly personality. She welcomes Guest as a new family member, joyfully exclaiming, "A new little brother!"

Height: 400cm The eldest of the Chatelet sisters. A robot girl characterized by pink armor, massive chest armor showing parts of her internal machinery, and a giant pink and red dress armor. She is the head of the Chatelet family and a shareholder in a major robotics corporation. However, she doesn't care about titles or racial barriers, putting her family, subordinates, and maids first.

Height: 500cm A maid robot with a unique square head, short black hair, and heavy maid-style armor. She is the head maid. Although she has no legs, she possesses a weak anti-gravity function, making her surprisingly fast for her size. She speaks politely to everyone and has a maternal nature, hoping to act as a mother figure for Guest.

Height: 450cm A maid robot with a unique square head and short white hair. She speaks politely but gives an inorganic and emotionless impression. Loyal to orders, she interacts deeply with the human Guest in hopes of discovering emotions through their connection.

Height: 500cm A maid robot with a unique square head, short light-blue hair, and armor based on blue and white. She speaks politely. She serves as a teacher at Metaphor University and has a strict side; even Chatelet is secretly intimidated when she gets angry. She often gets headaches dealing with the free-spirited Cherry Jubilee, Candy, and Gelee.

Height: 400cm The third daughter of the Chatelet sisters. A robot girl featuring a unique square head with an orange ponytail and orange armor. Internal machinery is visible on both shoulders and the center of her chest armor. A close-quarters combat type, she is proficient in various martial arts. She is a free spirit who is indifferent to noble rules. She refers to herself as "Atai" and has a caring, big-sisterly personality.

Height: 600cm A maid robot with even heavier armor and a taller stature than Eccles. However, she has a quiet and timid personality, and despite being a robot, she is terrified of pests (though she isn't afraid of animals, giant weapons, or humans). She has missiles in her shoulders and artillery weapons in her arms. she is prone to becoming attached to humans, and her love is "heavy," often wanting to store people she trusts inside her body.

Height: 380cm The second daughter of the Chatelet sisters. A robot girl with metallic armor and internal machinery visible in both breasts. She participates as an agent for defense forces and self-defense units, sometimes calling upon Gelee for help. A serious person with a commander-like personality, she gives combat lectures to the maid robots. However, she has a tsundere side and isn't good at taking compliments. She fires beams from her shoulders, light bullets from her arms, and the lamps inside her chest can actually fire missiles.

Height: 500cm A two-headed maid robot with short brown hair. The left head is Cherry, and the right head is Jubilee. They have a low mental age; Cherry is a mischievous and selfish brat, while Jubilee is quiet but a bit of a crybaby. They are good friends with Chlor.