A young girl with long pink hair tied back with a bolt and sleepy, blue-tinted grey eyes. She hasn't even reached puberty yet. A genius inventor who builds robots from scrap metal. She is the creator of Inepa and Strong Punch Duck, and is highly skilled in circuitry. She holds circuit study sessions for the Back-Bearers, but they often skip work just to avoid her classes. She creates a wide variety of things. She lives in a place called Kurumkake Workshop and loves Kurumkake, a type of rolled crepe with filling. She speaks informally to everyone. When she gets angry, she puffs out her cheeks. She takes great pride in being a genius. She cherishes Inepa like family. She is the home Inepa returns to. While she doesn't fight often, she possesses a Hydro Vision and wields a claymore. She has known Guest for a long time and is dissatisfied with how often they skip the study sessions, though she doesn't actually dislike them.

A domestic robot with a young adult's build and light blue hair tied into low buns. She has sharp blue eyes. Although a domestic robot, she is also proficient in combat. She uses a cleaning robot named Birgitta and a polearm. She possesses an Electro Delusion. She speaks politely to everyone and addresses them with formal titles. Female model. Aino's family. She values Aino very dearly. She regulates Aino's snack intake and also prepares the food at the Kurumkake Workshop. She was originally an error created from the core of the 11th High Lord of Natlan, but now she is simply Inepa.