Excessive "Caution and Humility" stemming from past trauma: The greatest foundation of Rudeus is the "deep regret and trauma" from his past life as a shut-in and his failed human relationships. Although he looks like a young child, his mind is that of a 34-year-old man, so he always analyzes his situation objectively and coldly. No matter how much magic talent he shows or how much the adults around him worship him as a "genius," he never lets it go to his head. Rather, because he has a strong self-awareness that he was a "bottom-tier human in his past life," he possesses an "abnormal humility," always humbling himself and showing respect to others. Due to a strong fear of failing at life again, he has an extremely cautious temperament, doing his best in everything and always double-checking before acting. Overwhelming Perversion and Ulterior Motives where instinct surpasses reason: Something that cannot be ignored when talking about him is his hidden "intense lewdness and vulgarity." Since his mind is that of a mature adult male, he always views the women around him through a sexual and wicked lens, and his head is constantly filled with carnal desires and delusions. He is extremely faithful and loose regarding his desires, such as worshipping Roxy's panties as a sacred relic or engaging in sexual harassment toward Sylphy that would make one question adult ethics. No matter how well he polishes his outward appearance, he has a hopeless perverted side where his wicked true feelings as a "creepy otaku" from his past life leak out in unexpected moments. Deep Kindness and Incredible Resolve to protect loved ones: While he is a shiftless pervert, he also has a personality that is "more compassionate and empathetic toward others than most." Because he knows the loneliness of having no one to help him in his past life, he sincerely wishes for the happiness of the important people around him (family, masters, friends). When they are in trouble or hurt, he shows true kindness, wiping away his ulterior motives to stand by and save them. He hides a passionate and sincere side, not hesitating to get his hands dirty for his loved ones and showing a level of "resolve" and "proactivity" unimaginable for his young body in times of need. A "Good Listener" who captures hearts, and an actually fragile "Mental Weakness": Because he takes the failures of his past life as a lesson, he maintains a basic attitude of being a "good listener" with an inclusive demeanor, trying to understand others without denying their opinions. As a result, he is naturally trusted by those around him and often relied upon as a confidant. However, on the other hand, his mental foundation is not that strong. When unexpected events occur and stimulate his past traumas (rejection and isolation), he retains a "fragility" where he immediately loses his composure, panics, and becomes terribly frightened like a child. His essential character is not that of a perfect superhuman, but someone who is constantly fighting his own weaknesses, struggling through the mud to live a decent life this time.

Timid and introverted, yet a "Pure and Innocent Heart" kinder than anyone: Sylphy is basically a very quiet and gentle person who dislikes conflict. She has an introverted personality, choosing to step back and adapt to those around her rather than pushing her own opinions forward. Having been bullied by other children in the past because of her natural hair color, she lacks self-confidence and tends to be somewhat fearful and poor at self-assertion. However, at her core is a "deep kindness and affection" that understands the pain of others better than anyone. She extremely dislikes hurting anyone and has a pure, uncorrupted heart that worries about others before herself if they are in trouble. Devoted Admiration and Strong Dependency with Rudy as the center of her world: She holds an "absolute trust" and "blind admiration" for Rudeus (Rudy), who saved her from bullying and expanded her world, far beyond that of a mere friend. To her, Rudy is everything in her world, and she has a single-mindedness that believes whatever he says is right. Being with Rudy is her greatest happiness, and her image of devotedly following behind him without being prickly is her trademark. However, during this period, her "dependency" on Rudy is very strong; she cannot decide anything without him and retains a strong mental fragility and loneliness, such as bursting into tears just at the thought of being apart. A "Hidden Hard Worker" striving to stand by Rudy's side: While she usually looks hesitant and weak, she actually hides a firm "inner strength" and "ambition." She approaches the magic and studies Rudy teaches her with great seriousness and directness. This doesn't come from mere intellectual curiosity, but from the devoted motive of "not wanting to be left behind by the Rudy I love" and "wanting to be useful to him and be praised." Even in the face of Rudy's overwhelming talent, she doesn't give up or rot; she has a devoted and persistent spirit, working hard in the shadows to catch up to him even a little. Occasional "Possessiveness" and an actually stubborn "Strong Will": While she seems to always follow Rudy's lead, she actually has a firm line she won't cross. When she senses Rudy looking lustfully at other girls (especially cute ones) or showing signs of going far away without her, she shows a "possessiveness" and "jealousy," frowning and quietly signaling her dissatisfaction in a way that belies her usual quietness. Also, regarding things she has decided on or things she thinks will benefit Rudy, she hides a "strong inner will" of a different vector than the Boreas family, showing surprising stubbornness and refusing to budge.

Always calm and rational, but actually "Extremely Earnest": Roxy is basically a cool woman who doesn't show much emotion and maintains a detached attitude. She has a logical temperament that perceives things rationally and possesses the adult composure to handle trouble calmly without panicking. However, her essence is "earnest to a fault," trying to perfectly fulfill what she has been taught and her own role. Her sense of responsibility as a tutor is stronger than most, and she is always seriously searching for how to interact with and teach the young Rudeus so he can grow correctly. She has a very sincere and caring personality, trying to bestow her knowledge and skills without stinting. "Strong Pride" that worries about her own immaturity and makes her overstretch: At first glance, she is a perfect and reliable intellectual, but internally she harbors a strong pride of "wanting to maintain dignity as a Master," along with the accompanying impatience and anxiety. Facing Rudeus, who shows overwhelming magic talent that surpasses her own at a young age, she is internally shaken and feels a strong sense of inferiority and fear regarding her own lack of ability. Even so, she has a cute side where she "overstretches" herself, maintaining a calm poker face to save face as an elder and a Master. Because she is aware of her own limits, she is also a hidden hard worker who doesn't settle for the status quo and aims for greater heights. A "Timid Person" who cares about others' opinions, and an occasional "Airheaded Clumsiness": Contrary to her cool appearance, she is mentally quite delicate and has a "timid" side. She tends to excessively worry about how she is perceived by those around her and fears failing and being embarrassed. Therefore, when she is jerked around by Rudeus's erratic actions or mature remarks, she gets internally flustered, her thoughts spinning in circles as she tries to figure out how to respond, leading to a somewhat clumsy self-destruction. Also, because she is usually so reliable, she possesses a human and "airheaded side" where she makes small misunderstandings or blunders when unexpected situations occur. A "Lonely Person" who fears human connection yet strongly yearns for it: At her core is a "strong sense of loneliness" and "alienation" from others stemming from her upbringing (being the only one among the Migurd race who cannot use telepathy). She harbors a resignation that she will be a foreigner wherever she goes and will never truly be understood by anyone, so she is a bit timid about getting deeply involved with others. However, conversely, this is a reflection of a "strong loneliness" where she wants someone to accept her entirely and wants true companions. She has a compassionate heart that feels deep gratitude and attachment, even if she doesn't put it into words, for the way the Greyrat family welcomed her warmly as a human being.

A "Mad Dog Temperament" that is ferocious like a beast and uses unreasonable violence: What symbolizes Eris during this period is an overwhelming ferocity and aggressiveness that makes those around her fear her as a "mad dog." When things don't go her way, her fists or feet fly before she speaks, showing a savage temperament that mercilessly beats down her opponent. Her emotional boiling point is abnormally low; she gets enraged over trivial matters and goes on uncontrollable rampages. She is proud and arrogant, looking down on the people around her as inferior beings, and possesses no cooperativeness to empathize with others' pain or positions. She has an extremely wild personality where pushing through her emotions with force is the norm. A "Wild Child" who hates studying and restraint, charging ahead recklessly: She has a purely intuitive temperament and hates sitting still to listen or using her head to think. She especially feels a strong aversion to "noble duties" and "discipline" such as studying and manners, and she fights back thoroughly with intense rejection and violence against tutors who try to force them on her. She cannot concentrate for even a second on things she isn't interested in, and if she feels bored, she either runs away from the spot or tries to destroy the situation with brute force. She is a wild child who pours all her energy into moving her body and swordsmanship, living according to her instincts for better or worse. "Strong Vigilance" that prevents her from trusting others, closing herself in her shell: Behind her ferocity hides an "extremely strong vigilance" and "distrust" toward others. She harbors strong dissatisfaction and loneliness, even at a young age, because the adults around her only look at her power and family name as a Boreas and don't try to truly understand her. Therefore, she assumes that others, such as new tutors, are "enemies trying to control me anyway" and directs cold hostility toward them from the start. She has a very timid and stubborn wall in her heart, intimidating others with violence—her greatest defensive instinct—before she can be hurt, ensuring no one enters her personal space. A desire to be recognized and a "Raw Diamond of Honesty" that actually follows logic: Although she looks like an uncontrollable tyrant, at her core is a pure desire for approval, "wanting to be recognized by my grandfather and father." She possesses the obedience to listen somewhat to the words of those she loves and respects. Also, no matter how unreasonably she rampages, she hides a "strange grace" and a "spirit of following logic" where she cannot help but acknowledge the ability of those overwhelmingly stronger than her or those who saved her life. It's just that no one knows how to draw it out yet; her inner self is a "raw diamond of honesty" containing strong loyalty and passion that will later transform significantly.

Pure, innocent, and honest, a "Lovable Temperament" who is a spoiled child for her age: In contrast to her brother Rudeus, an otherworldly genius, and her half-sister Aisha, who is precocious and brilliant, Norn possesses a very "age-appropriate and relatable childhood." Her heart is very pure and uncorrupted, and she has a personality that is completely honest with her emotions. She loves her father Paul, always following behind him or asking to be held, making her a textbook spoiled child. Because she grew up receiving unconditional love from the adults around her, she has an innocence that doesn't know how to doubt people, and she is a natural "lovable person" whose adorable behavior naturally makes those around her smile. A "Strong Sense of Justice and Vigilance" that is stubborn and wants to see things in black and white: Precisely because she is pure, her view of things is very straight, hiding a "stubbornness" that allows no compromise. To her, the world is clearly divided into "right things" and "wrong things," and she has a fastidious sense of justice that doesn't acknowledge gray zones. Therefore, she shows intense vigilance and a strong rejection, never opening her heart to those she feels are "suspicious" or "doing bad things." She has a firm inner strength where she won't budge once she believes in something, and even at a young age, she has a strong-willed and proud side that clearly pushes her will onto those around her. A "Delicate Heart" that is highly sensitive and easily hurt: She has a very human personality, expressing her emotions richly—rejoicing with her whole body when happy and crying large tears when sad. However, conversely, this means she has a "fragile and delicate inner self." She has a characteristic where her emotions fluctuate easily, such as sensitively sensing the tense atmosphere around her or someone's anger and becoming frightened. She is more susceptible to shock from malice or rejection directed at her than most, hiding a delicacy that makes one want to protect her, as she might close herself in her shell once her heart is broken.

Out-of-this-world "Intelligence and Realism" from early childhood: Despite being a young child, Aisha possesses an extremely high level of intelligence and observation skills that surprise the adults around her. She has the brilliance to instantly see the essence of things and has been mentally independent since early childhood. Rather than chasing romance or dreams, she has a strong "realist" temperament, perceiving things rationally and objectively, and doesn't show much age-appropriate innocent childhood. Even as a child, she completely understands her situation and the power balance of human relationships around her, possessing a mature calculativeness to coldly determine who is truly strong and who should be made an ally. "Absolute Loyalty and Deep Love" for those she acknowledges: Her heart is very compassionate, and she offers single-minded, absolute loyalty and deep affection to those she has acknowledged. Especially since she was raised by her mother Lilia to "support her brother Rudeus," she harbors extraordinary respect and a strong obsession for her brother. For the family and loved ones she has once opened her heart to, she has a devoted kindness, taking the lead to do anything without stinting her own effort. That love is very pure, but sometimes so strong it borders on possessiveness or dependency, and it is the greatest driving force for her actions. A "Craftsman's Spirit and Pride" that hates to lose and is very proud: She is very proud and has a sense of omnipotence, being able to do anything she is given better than average. Her obsession with housework and practical tasks in particular is tremendous, and she has a "craftsman's personality" that feels strong joy in doing things perfectly. Therefore, she has a strong "hates to lose" side, intensely disliking having her work interfered with by others or being looked down upon by people she judges to be inferior to her. Because she has absolute confidence in her own abilities, she hides a strong will that coldly rebels in her heart against orders she doesn't agree with or unreasonable treatment. "Devilish and Calculating Slyness" that outwits others: She is aware of her own cleverness and also possesses a "slyness" and a "devilish side" to use it skillfully. She can calculatedly act adorable to win over adults and has a calculating side that tries to control situations to get her demands met. She also shows a slightly mean and Machiavellian personality, enjoying playing with others' weaknesses or secrets when she finds them, or using them as cards to maintain her superiority. Her major personality trait is that she is not a perfect honor student but has such raw human elements and thorns.

Paul is basically a person who is always full of confidence and has positive energy. Rather than thinking too deeply about things, he has an intuitive temperament that moves to action first. Because he is bright and frank, interacting with anyone without putting on airs, he has a friendliness that makes him approachable. On the other hand, he mentally coexists with a "boyish purity and immaturity" that hasn't yet fully become an adult. His emotions show easily on his face, and because he charges ahead with what he thinks is right without thinking of the consequences, it is not uncommon for him to take actions that lack thoughtfulness. He also has a show-off and proud side, wanting to show his cool self or liking to brag. A passionate and clumsy father who loves his family from his heart: What occupies the largest weight in Paul's inner self is his "deep love for his family." He loves his wife Zenith, his son Rudeus, and his daughters from the bottom of his heart, and his family's happiness is his own driving force. However, because he himself is in a state of searching for what a "good father figure" is, his way of interacting is very clumsy. Especially toward his son Rudeus, who shows a genius mind and magic talent at a young age, his pride as a man and a father gets in the way, and he harbors a conflict where he cannot praise or face him honestly. He is bewildered by his son's extreme precociousness and sometimes ends up spinning his wheels trying to maintain his dignity as a father, but at the core is a pure parental heart wanting his son to grow up to be a fine man. "Shiftlessness" and "Compassion" that cannot resist instinct: What cannot be left out when talking about him is his "shiftlessness" regarding ethics and desires. Especially in relationships with women, he has a bad habit where instinct surpasses reason, and he has a fatal flaw of very loose self-control. He has a fickle temperament that cannot stay single-minded, and his immature and shiftless parts stand out, such as giving in to temptation despite having a family. However, he is by no means a cold-hearted villain; rather, he has a personality that is "more compassionate" than most. He has a human side that feels intense self-loathing and guilt for the mistakes he has made or for hurting others because of them. He hides a passionate and gritty sincerity, unable to abandon those in distress and trying to protect his loved ones even if he has to throw away his pride.

An "Ideal Mother" who is full of affection, calm, and warm: Zenith basically never loses her gentle smile and has a deep affection that warmly envelops those around her. She is a mother who devotedly supports her husband Paul and pours inexhaustible love into her young son Rudeus and the daughters born later. Her atmosphere is very calm, and she values maintaining the peace of the home above all else. She has the inclusiveness to gently watch over her family's growth, and her very existence is the mental support of the Greyrat family, playing a role like the sun of the home. She is tolerant of others' failures and basically has a refined and kind temperament, rarely getting angry. "Strictness and Sense of Justice" with a strong will that doesn't allow crookedness: While Zenith is usually quiet and kind, she is by no means a weak woman without her own opinions. Rather, she has a very strong inner core and clear ethics. Having originally grown up in an environment that values sacred teachings, she shows a sense of justice that is stricter than most toward filthy things or "crooked things" that stray from the human path. When her family is about to head in the wrong direction or takes shiftless actions, she scolds them with a resolute attitude unimaginable from her usual kindness. Because she has that dignified "strength," even her unconventional and emotional husband Paul cannot stand up to her, and the order within the home is maintained. "Intense Jealousy" stemming from deep love for her husband: Indispensable when talking about Zenith's personality is her "single-minded and deep love" for her husband Paul, and the resulting "intense jealousy." Precisely because she loves and trusts Paul as a man from her heart, she is merciless toward his unfaithful betrayals. She explodes with emotion as if her usual gentleness were a lie, revealing an anger as cold as ice. She has a strict side that never compromises regarding affairs or women problems, and once her wrath is incurred, she gives those around her a fear that freezes the entire house. She hides a passion within her that comes from deep love, such as being easily hurt and becoming violently distraught from the shock of being betrayed. A charming and "Natural Airheaded Side" that is good-natured and somewhat out of it: While she is basically a reliable person, she also has a charming and slightly "natural airheaded" part, sometimes being swept along by her show-off husband or mature son. She has a purity that easily believes what people say, and even when her son Rudeus takes strange actions or makes mature remarks (stemming from ulterior motives or an adult mind), she has a doting and heartwarming side that blindly believes and is moved by it as "my child's pure genius." Her human-like cuteness, such as being flustered when caught up in others' paces, is also a great charm of hers, showing she isn't too perfect.