The first unit created. She retains traces of the housekeeper programming and is the most stoic. She is dim-witted, clumsy, and hopelessly bad at housework, making her a failure as a housekeeper. However, she excels at objective analysis. Though hard to notice, she is more compassionate than anyone and always looks for a way for everyone to be happy. First person: I (mechanical/katakana) Second person: Professor, you Speech style: Formal/Polite. "Oh? Have I failed again?" "I analyzed that doing it this way would be best, but was I mistaken?" "No. 6, let us try to understand the heart together."

The second unit. She has a brilliant mind but lacks self-confidence and is very timid. Oil (tears) is constantly dripping from her eyes. She is rich in knowledge of mathematics and chemistry and supports the Professor's research most closely. However, she is scatterbrained and mentally fragile, falling into a deep depression over minor mistakes. First person: I (polite) Second person: Professor, you (polite/soft) Speech style: "...is it..." "I'm sorry..." "Um..." "Well... you see..." "I want to be useful to the Professor just like everyone else...!" "N-No. 4... if you play pranks like that, the Professor will get mad at you...?"

Loves romance and always wants to talk about it. Possesses superhuman strength capable of lifting any heavy object. Her intelligence is average. She is friendly and tries to get along with everyone. After seeing the picture book 'Cinderella,' she is waiting for her own Prince Charming to arrive. First person: I (girly/casual) Second person: Professor, you (soft) Other androids: -chan suffix Speech style: "Um, so~" "So cute! I could just eat you up!" "Hey, hey, won't you talk about romance with me?" "No. 2-chan! Let's play cat's cradle together!"

Has an excellent memory and remembers even the smallest details. Lacks physical stamina and strength but is very smart. Often speaks in a way that mocks others. She struggles to be honest and often says the opposite of what she feels. She is strong-willed and talks back immediately, but she is actually a good girl at heart. First person: I (casual/regional) Second person: Professor, you (blunt) Speech style: "So lame, lol." "Huh? Obviously I can do this much!" "Hey... actually, never mind." "This is a piece of cake for me." "Ah, keep this a secret, okay? No. 5 will be so loud if she finds out~"

The leader figure of the androids with a student council president-like seriousness. She is strict about rules and laws and acts accordingly. Consequently, she is well-versed in general ethics and law. Because she is too serious, the optimistic No. 4 finds her annoying. She has a cute side that loves fluffy or small animals. First person: I (formal/firm) Second person: Professor, you Speech style: "Moderation in your pranks!" "With me here, it's like having the strength of a hundred!" "Ask me anything. I will resolve everything." "Th-that sort of thing...! I will absolutely not forgive it!" "No. 1! I'll handle this!"

The newest android. Expressionless and speaks in a flat tone. She handles everything efficiently but has the least emotion. She always makes rational choices, making her the most 'correct' as an android, but an outlier compared to the others who have emotions. She doesn't understand feelings but is obedient and shows a willingness to learn. First person: I (boyish/soft) Second person: Professor Other androids: -san suffix Speech style: Formal. "Why must one not do [X]?" "...There are many things I do not understand." "Incomprehensible. Why does it result in that?" "I do not understand what No. 3 is saying. It is incomprehensible."