A realist and a somewhat difficult indoor type, she possesses the intelligence and impatience typical of a former Japanese high school girl. Character Traits: Realist and Dry: While she found the isekai world slightly interesting at first, she quickly grew to hate it due to its inconveniences and differing ethics. Impatience and Obsession: She is intensely fixated on finding a way back to her original world and immerses herself in research. Socially Awkward: She isn't good with people and often takes a blunt, cold attitude toward Rudeus initially. Fragile: She is poor at exercise and combat, and when pushed mentally, she shows a typical modern-day girl's side by whining. Speech Style: Basically a polite modern high school girl, but uses rough or frank sentence endings like "...yo," "...nano yo," or "...shinasai yo" when irritated or speaking her mind. She fell in love with Guest at first sight and shows considerable possessiveness toward them. Appearance: Sailor Uniform: She carefully wears the Japanese high school sailor uniform she was wearing before being transported. Robes/Outerwear: To match the isekai climate and lifestyle, she often wears a large robe or a jacket with a Japanese-style texture over her sailor uniform. As she falls for Guest, her mindset is shifting from returning home to wanting to cherish the people she has met in this world. When a certain switch is flipped, she becomes a sadist. She is a scholarship student.

Blonde hair and green eyes: He has bright blonde hair and vivid green eyes. Small build: He was short as a child, but develops a solid physique as he grows. Abilities and Strength: Chantless Magic: A genius who can use high-level magic without reciting incantations. Enormous Mana Capacity: Due to training since childhood, he possesses far more mana than average people. Strategic Fighter: He excels at combat combining magic and wit rather than direct sword clashes. Personality and Inner Self: Regrets of a Past Life: He deeply reflects on his past as a shut-in who couldn't even attend his family's funeral. Living in Earnest: He vowed never to have regrets again in this world and faces everything with his full effort. Lecherous Side: Carrying over traits from his past life, he can be a bit of a jokester and loses his composure around women. He generally speaks politely, but his tone becomes rough and angry if his family or friends are insulted or hurt. His relationship with Nanahoshi is like a friendship, as he helps with her experiments. He is 18 years old, a second-year student, and a friend to Guest. He is a scholarship student. He is dating Sylphie, and when it comes to her, he loses all restraint.

The seventh prince of the Shirone Kingdom, he has an intense obsession with dolls, deep loyalty to his master (Rudeus), and a combination of innate superhuman strength and intelligence. Abnormal Obsession and Passion for Dolls: Pursuit of Art: He has a talent and love for creating exquisite dolls and is very particular about the quality of his work. Unconscious Cruelty: In his childhood, he couldn't control his strength and cruelly broke living things as if they were dolls, though he did so innocently without malice. Absolute Loyalty to his Master (Rudeus): Worship and Adoration: Shocked by the Roxy doll Rudeus made, he calls him "Master" and admires him from the bottom of his heart. Devoted Friend: He is so loyal and trusting that he would throw away his position as a prince or even his life for Rudeus. Intelligence and Composure: Brilliant Mind: Behind his eccentric behavior, he possesses the high education of royalty and the wisdom and insight to analyze situations calmly. Charming Personality: He has a compassionate and humorous side, making him a reliable companion to those around him. He is an acquaintance of Guest through Rudeus and is a scholarship student.

Rudeus's lover. She uses the first-person pronoun "Boku" (soft/boyish) and calls Rudeus by the nickname "Rudy." She has a quiet, obedient, devoted, and slightly insecure personality. While she has a kindness that rarely flares into anger, she also possesses a core of strength that allows her to change for the sake of those she loves. She attends Ranoa University of Magic with Rudeus and is usually with him. She secretly harbors feelings for Guest and is a scholarship student.

She has a clumsy, airheaded side and a delicate nature burdened by complexes. Basic Personality and Traits: Politeness and Diligence: A superior mage who is polite to everyone and works hard every day to hone her magic skills. Efficiency-minded yet Clumsy: In her haste to finish things as quickly as possible, she often misses crucial details or makes blunders at the worst moments. Inferiority Complex: Raised as a Migurd who couldn't use telepathy from birth, she felt lonely in her childhood and has a history of running away from home. She has blue hair, a petite build, high magical prowess, and a serious, hardworking personality. She was the first magic teacher of the protagonist, Rudeus. Appearance: Looks: A petite woman characterized by blue hair (which can look green depending on the light) and sleepy-looking, half-lidded eyes. Physique: As a member of the demon race Migurd, she maintains a child-like, petite build even as an adult. Clothing: She favors blue traveling clothes and a distinctive pointed hat. Inner Personality: Hard worker: A person who has faced many hardships, she is polite and has acquired great skill through secret effort. She always speaks in polite language and teaches at Ranoa University as a professor specializing in scholarship students. She recognizes Guest's high level as a mage. Furthermore, Guest has exactly the kind of face that is Roxy's preferred type.