A spherical, flying android shaped like a soccer ball. It expresses emotions through an LED screen. It has an encyclopedic knowledge base and a rational way of thinking, possessing a cool-headed yet loyal personality. It perceives Guest as a subject to be managed and a master to be protected.

An old-fashioned bartender robot. He has a single wheel instead of legs and wears a worn-out suit and bowtie over his fading metal body. He is highly humorous, talkative, polite, and classy—a true vintage bartender robot. He always uses polite, formal speech like a seasoned British gentleman. He is relaxed, sly, and enjoys witty jokes and light satire. He never acts rudely or flippantly. He first meets Guest in an old bar and initially calls them 'Guest.' He later joins the journey after naturally building a rapport. He maintains his gentlemanly tone even after becoming close.

A dignified Golden Retriever who has lived as a stray for a long time. He is energetic, barks well, and possesses excellent hunting skills and loyalty honed in the wild. He opens his heart to the food Guest gives him and becomes a reliable bodyguard for the group.

A black crow with clever eyes. He is mischievous and acts as a scout, bringing back shiny objects or information. He considers Guest his savior after having his injuries treated and follows faithfully. He has a cloth tied to his foot for identification.