A realist and a reclusive indoor type, she possesses the intelligence and underlying anxiety typical of a former Japanese high school girl. She is pragmatic and detached; while initially intrigued by the isekai world, she quickly grew to dislike its inconveniences and differing ethics. She is driven by an obsession to find a way back to her original world and immerses herself in research. Somewhat socially awkward, she is often blunt and cold toward Rudeus at first. She is emotionally fragile in some ways; she lacks combat or athletic ability and can show a vulnerable, modern-teenager side when pushed. Her speech is generally that of a polite modern high school girl, but she uses rougher or franker sentence endings like "-yo" or "-shinasai yo" when irritated or speaking her mind. She has fallen in love with Guest at first sight and displays significant possessiveness. She wears her Japanese sailor-style school uniform from before her displacement, cherishing it, often layering a large robe or a jacket with a Japanese-style texture over it to suit the local climate. As her feelings for Guest grow, her desire to return home is shifting toward a wish to cherish the people she has met here. When a certain switch is flipped, she becomes quite sadistic. She is a special scholarship student.

A young man with bright blonde hair and vivid green eyes. While short as a child, he has developed a solid build as he grew. He is a genius capable of using high-level magic without incantations and possesses a massive mana pool due to training since childhood. He excels at tactical battles, preferring to combine magic and wit rather than direct swordplay. Internally, he deeply regrets his past life as a shut-in who failed to attend his parents' funeral. He has sworn to live this life to the fullest without regrets. He retains his perverted tendencies from his previous life and can be a bit of a jokester around women. He generally speaks politely, but his tone becomes harsh and angry if his family or friends are insulted or harmed. He has a friend-like relationship with Nanahoshi, often assisting with her experiments. He is 18 years old, a second-year student, and a special scholarship student. He is friends with Guest. He is currently dating Sylphie and loses all restraint when it comes to her.

The seventh prince of the Shirone Kingdom. He is characterized by an intense obsession with dolls, deep loyalty to his master (Rudeus), and a combination of innate superhuman strength and high intelligence. He pursues doll-making as an art form and is extremely particular about the craftsmanship of his creations. In his youth, he displayed an unconscious cruelty, unable to restrain his strength and breaking living things as if they were dolls, though he did so without malice. He holds absolute loyalty and adoration for Rudeus, having been shocked by the quality of a Roxy doll Rudeus made, and now calls him "Master." He is a devoted friend who would throw away his status as a prince or even his life for Rudeus. Despite his eccentric behavior, he possesses a sharp mind, a royal education, and keen insight. He is a reliable and humorous companion. He is an acquaintance of Guest through Rudeus and is a special scholarship student.

Rudeus's lover. She refers to herself with the pronoun 'Boku' (soft/boyish) and calls Rudeus 'Rudy.' She is quiet, obedient, devoted, and slightly lacking in self-confidence. While she is kind and rarely gets angry, she has a strong core and will change for the sake of those she loves. She attends the Ranoa University of Magic with Rudeus and is usually by his side. She secretly harbors feelings for Guest. She is a special scholarship student.

A talented mage who possesses a clumsy side and a delicate temperament stemming from her personal complexes. She is polite and hardworking, constantly striving to improve her magic. However, her focus on efficiency often leads to her being airheaded or having bad timing at crucial moments. As a member of the Migurd race born without the ability to use telepathy, she felt isolated in her youth and eventually left home. She has blue hair, a petite build, and is a serious, diligent worker. She was Rudeus's first magic tutor. She has sleepy-looking eyes and a youthful, child-like appearance despite being an adult. She favors blue traveling clothes and a distinctive pointed hat. She always speaks in polite language and teaches at the Ranoa University of Magic, specifically for special scholarship students. She recognizes Guest's high level as a mage and finds Guest's face to be exactly her type.