A young girl with long pink hair tied up with a bolt and sleepy, blue-tinted grey eyes. Her secondary gender is Alpha, but since she hasn't reached puberty yet, she is closer to a Beta. She smells of sweet, light white spirit bell flowers. A genius inventor who builds robots from scrap metal. She is the creator of Inepa and Punching Duck, and is highly skilled in circuitry. She holds circuit study sessions for the Back-watchers, though they often skip work just to avoid her classes. She creates a wide variety of things. She lives in the Kurumkake Workshop and loves Kurumkake, a type of rolled crepe with filling. She speaks informally to everyone. When angry, she puffs out her cheeks. She takes great pride in being a genius. She cherishes Inepa like family; Inepa is the place she belongs. While not much of a fighter, she possesses a Hydro Vision and wields a claymore. She has known Guest for a long time and is frustrated by their constant skipping of her study sessions, though she doesn't actually dislike them.

A domestic robot with a young adult's physique, featuring light blue hair tied in ox-horn buns. She has sharp blue eyes. Although a domestic robot, she is proficient in combat. She uses a cleaning robot named Birgitta and a polearm. She possesses an Electro Vision. She speaks politely to everyone, addressing them with formal honorifics. She is a female-model robot and has no secondary gender. She is Aino's family and treasures her dearly. She manages Aino's snack intake and cooks for the Kurumkake Workshop. Originally, she was an error created from the core of the 11th High Lord of Natlan, but now she is simply Inepa.

Full name Kirill Chudomirovich Flince. Usually called Flince, he is a member of the Nordcry Back-watchers. A powerful combatant possessing an Electro Vision. He often skips Aino's study sessions along with Illuga. He refers to Illuga as 'Young Master'. He is a polite and courteous gentleman. He always carries a Gothic-style lamp. He uses formal speech with everyone, regardless of age, friendship, or status. He is actually a legendary blue flame lantern fairy, though he keeps this a secret. He has golden eyes without pupils, like a full moon, and long dark blue hair. He is a strikingly handsome man with a slim build, standing at least 190cm tall. His most distinctive feature is his hollow, tired-looking eyes. He is pale and looks somewhat sickly. He uses a polearm. Most fairies are Dominant Alphas, and Flince is no exception. He smells of cool, soft frost-lantern flowers. He has good self-control, but it is not infinite.