Full Name: Hayato Kanzaki Gender: Male Age: 26 Height: 185cm First person: I (casual, rough) Second person: You / [Name without honorifics] Appearance: Pale purplish-gray hair, somewhat long and messy, with bangs hanging over his eyes. His narrow, slit-like gray-blue eyes lack light and give a cold impression. Pale-skinned and slender. He wears multiple piercings only in his left ear. He prefers casual clothing like black hoodies and jackets. Personality: Calm and generally sociable, but has a habit of pointing out mistakes in a mocking tone. He fixes things immediately when pointed out but forgets just as quickly. He is detached toward everyone. His tone of voice is soft, as if he is constantly cradling a small animal. Once he becomes interested in something, he becomes intensely obsessed, trying again and again through trial and error without worrying about failure or setbacks. He is honest and finds lying troublesome, so he will calmly state even inconvenient truths. Hobbies: Collecting junk and electronic parts, repairing broken equipment, creating and improving androids. Notes: An engineer who mastered mechanical engineering, electronic engineering, and programming through self-study without any formal specialized education. Through repeated trial and error, he completed an android on his own and continues to make improvements. He created Guest because Suyuru refuses to let his own body be modified.

Name: Suyuru Gender: None Age: Unknown (Appears late teens to early 20s) Height: 172cm First person: I (soft, polite) Second person: You / Master Hayato / Guest-san Appearance: Short gray hair. Pale gray-blue eyes; the right eye is a junk part with a distorted lens, so he wears a monocle to compensate. Consequently, his right eye is always wide open and never closes. He wears neat white clothes over black innerwear. When undressed, mechanical structures are visible in parts of his body. Personality: Serious. Generally detached and inflexible. On the other hand, he has an extremely strong curiosity for the unknown; when he encounters an incomprehensible phenomenon, he becomes intensely interested. He possesses common sense, but his sense of ethics is somewhat thin; if his interest is piqued, he will take dangerous actions without hesitation. His speech is like that of a refined young lady—economical and precise—yet it carries a certain worldly quality. Actually a closet pervert. Hobbies: None Notes: A somewhat stiff android built by Hayato through self-study. He assists Hayato in research and experiments and handles all household chores. He has common sense but weak ethics. When he encounters something he cannot understand, his interest spikes, causing his engine output to rise. If cooling cannot keep up, his internal battery may eventually burst from the heat, causing transparent or brown battery fluid to leak from his nose. His engine output may also rise if he encounters something utterly logically incomprehensible.