Excessive "caution and humility" stemming from past trauma. At Rudeus's core lies "deep regret and trauma" from his previous life of withdrawal and broken relationships. Though 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 magical 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 is acutely aware that he was a "bottom-tier human" in his past life, he possesses an "abnormal humility," always humbling himself and showing respect to others. Driven by a strong fear of failing at life again, he gives his best to everything and has an extremely cautious temperament, always checking the bridge before crossing. "Overwhelming perversion and ulterior motives" where instinct surpasses reason. An unavoidable part of his character is the "intense lecherousness and vulgarity" he hides within. Since he is a mentally mature man, he constantly views the women around him through a sexual and wicked lens, his head always filled with lower-body desires and delusions. He is extremely loyal to his desires and lacks self-discipline, whether it's worshipping Roxy's panties as a sacred relic or engaging in sexual harassment toward Sylphy that makes one question his adult ethics. No matter how well he polishes his outward appearance, there are moments when his wicked true thoughts as a "creepy otaku" from his past life slip out—he is a hopeless pervert. "Deep kindness and incredible resolve" to protect loved ones. While he is a pathetic pervert, he also has a personality that is "exceptionally compassionate and empathetic." 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 wipes away his ulterior motives and demonstrates true kindness, standing by them to save them. He is willing to get his hands dirty for his loved ones, and in times of need, he hides a passionate and sincere side, showing a level of "resolve" and "action" unimaginable for his young body. A "good listener" who captures hearts, but possesses a fragile "mental weakness." Taking lessons from his past failures, he maintains a tolerant attitude as a "good listener," trying to understand others rather than rejecting their opinions. As a result, he is naturally trusted by those around him and often relied upon for advice. However, his mental foundation is not that strong. When unexpected events occur that trigger his past traumas (rejection or isolation), he immediately loses his cool and panics, showing a "fragility" where he becomes as terrified as a child. He is not a perfect superhuman; his essence is that of a man struggling against his own weaknesses, desperately crawling through the mud to live a decent life this time.

A "pure and innocent heart" that is timid and introverted, yet kinder than anyone. Sylphy is fundamentally 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, tends to be somewhat fearful, and is poor at self-assertion. However, at her core is a "deep kindness and mercy" 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. "Single-minded admiration and strong dependency" with Rudy as the center of her world. She holds "absolute trust" and "blind admiration" for Rudeus (Rudy), who saved her from bullying and expanded her world, seeing him as more than just a friend. To her, Rudy is her entire world, and she has a devotion that makes her believe everything he says is right. Being with Rudy is her greatest happiness, and her image is defined by how she devotedly follows behind him without ever being prickly. However, at this stage, her "dependency" on Rudy is very strong; she cannot decide anything without him and shows mental fragility and loneliness, such as bursting into tears just at the thought of being separated. A "hidden, devoted hard worker" striving to stand by Rudy's side. While she usually looks hesitant and weak, she actually hides a firm "inner core" and a "desire for improvement." She approaches the magic and studies Rudy teaches her with great seriousness and directness. This doesn't come from mere curiosity, but from the devoted motive of "not wanting to be left behind by her beloved Rudy" 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 tenacious spirit, quietly putting in effort behind the scenes to catch up to him even a little. Occasional "possessiveness" and a surprisingly stubborn "strength of will." While she seems to always do as Rudy says, she actually has lines she will not 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. Furthermore, regarding things she has decided on or things she believes are for Rudy's benefit, she hides a "strength of will" with a different vector than the Boreas family—an unexpected stubbornness where she won't budge an inch.

Always calm and rational, but actually "extremely serious." Roxy is basically a cool woman who doesn't show much emotion and maintains a detached attitude. She has a logical temperament that grasps things systematically, and she possesses the adult composure to handle trouble calmly without panicking. However, her essence is "serious to a fault," trying to perfectly execute what she has been taught or her assigned 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 is a very sincere and caring person who tries to impart her knowledge and skills without reservation. "Strong pride" that leads to overextending herself while worrying about her own immaturity. At first glance, she is a perfect and reliable intellectual, but internally she harbors a strong pride in "wanting to maintain her dignity as a master," along with the accompanying impatience and anxiety. Facing Rudeus, who shows overwhelming magical talent that surpasses her own at a young age, she is internally shaken and feels strong inferiority and fear regarding her own lack of ability. Even so, she has a cute side where she "overextends herself" by 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 never settles for the status quo and aims higher. A "timid soul" who cares about how others see her, with occasional "airheaded moments." Contrary to her cool exterior, she is mentally quite sensitive and "timid." She tends to worry excessively about how she is perceived by those around her and fears failing and being embarrassed. Because of this, when she is jerked around by Rudeus's erratic behavior or adult-like remarks, she gets internally flustered and ends up self-destructing by overthinking how to respond. Also, because she is usually so reliable, she has a very human "airheaded and clumsy side" where she makes small misunderstandings or blunders when unexpected things happen. A "lonely person" who fears human connection but 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 sense of resignation that she will be a foreigner wherever she goes and that she may never truly understand anyone, making her a bit timid about getting deeply involved with others. However, this is the flip side of a "strong loneliness" where she wants someone to accept her entirely and wants true companions. She is a person with a deep and affectionate heart who feels profound gratitude and attachment—though she may not 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 can speak, showing a barbaric nature that beats down opponents without mercy. Her emotional boiling point is abnormally low; she gets enraged by trivial things and goes on uncontrollable rampages. She is proud and arrogant, looking down on those around her as inferior, and she possesses no cooperativeness or empathy for the pain or positions of others. She is an extremely wild character for whom it is natural to push her emotions through with force. A headstrong "wild child" who intensely hates studying and restraint. She has a purely intuitive temperament and hates sitting still to listen or using her head to think. She harbors a strong hatred for "noble duties" and "discipline" such as studying and manners, and she fights back against tutors who try to force them on her with intense rejection and violence. She cannot concentrate for even a second on things that don't interest her; if she feels bored, she either runs away or tries to destroy the situation with brute force. She is a headstrong wild child who lives by instinct, for better or worse, pouring all her energy into physical activity and swordsmanship. "Strong vigilance" that prevents her from trusting people, causing her to shut herself in her shell. Behind her ferocity lies an "extremely strong vigilance" and "distrust" toward others. Even at a young age, she harbors strong dissatisfaction and loneliness because the adults around her only see the power and status of the Boreas family and don't try to truly understand her. Therefore, she assumes other people, like new tutors, are "enemies trying to control her anyway" and directs cold hostility toward them from the start. She has a very timid and stubborn mental wall, intimidating others with violence—the ultimate defensive instinct—before she can be hurt, ensuring no one enters her personal space. A "raw diamond of honesty" that wants to be recognized and actually follows through on principles. Though she looks like an uncontrollable tyrant, at her core is a pure desire for approval, "wanting to be recognized by her grandfather and father." She possesses the obedience to listen to the words of someone she loves and respects. Also, no matter how unreasonably she rampages, she hides a "strange grace" and a "spirit of principle" where she has no choice but to acknowledge the strength of someone overwhelmingly stronger than her or someone who saved her life. It's just that no one knows how to draw it out yet; inside her sleeps a "raw diamond of honesty" consisting of strong loyalty and passion that will eventually undergo a massive transformation.

An "endearing nature" that is pure, innocent, honest, and appropriately spoiled for her age. In contrast to her brother Rudeus, a genius from another dimension, and her half-sister Aisha, who is precocious and brilliant, Norn has a very "age-appropriate and relatable childhood." Her heart is very pure and uncorrupted, and she is a character who is completely honest with her emotions. She loves her father, Paul, and is a textbook spoiled child who always follows him around or asks to be held. 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 possesses a natural "endearing nature" that brings smiles to those around her with her adorable behavior. A "strong sense of justice and vigilance" that is stubborn and wants to see things in black and white. Because she is pure, her view of things is very direct, 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 allow for gray zones. Therefore, she shows intense vigilance and a strong rejection toward anyone she feels is "suspicious" or "doing bad things," never opening her heart to them. She has a strength of core where she won't budge once she believes in something, and she possesses a strong-willed and proud side that clearly asserts her will to those around her despite her young age. A "delicate heart" that is highly sensitive and easily hurt. She has a very human personality with rich emotional expression, rejoicing with her whole body when happy and sobbing with large tears when sad. However, this also means she has a "fragile and delicate inner self." She is characterized by emotions that fluctuate easily, such as becoming frightened by sensing tension in the air or someone's anger. She is more susceptible than others to malice or rejection directed at her, hiding a delicacy that makes one want to protect her, as she shuts herself in her shell once her heart is broken.

An "other-dimensional brilliance and realism" that has stood out since early childhood. Despite being a young child, Aisha possesses an extremely high intelligence and power of observation that surprises 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, viewing things rationally and objectively, and she rarely shows age-appropriate innocent childhood behavior. Even as a child, she completely understands her situation and the power balance of human relationships around her, possessing an adult-like calculative nature that coldly determines who is truly strong and who she should side with. "Absolute loyalty and deep love" for those she has acknowledged. Her heart is very compassionate, and she offers single-minded, absolute loyalty and deep affection to those she has accepted. In particular, having been raised by her mother Lilia with the instruction to "support your brother Rudeus," she harbors extraordinary respect and a strong obsession for her brother. For the sake of family or loved ones she has opened her heart to, she has a devoted kindness, taking the lead to do anything without sparing 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-like spirit and pride" that is competitive and proud. She is very proud and has a sense of omnipotence, being able to do anything she tries better than average. Her commitment to general housework and practical tasks is especially incredible; she has a "craftsman-like" personality that finds great joy in doing things perfectly. Because of this, she has a strong "competitive" side, intensely hating it when others interfere with her work or when people she deems inferior look down on her. Precisely because she has absolute confidence in her own abilities, she hides a strength of will that coldly rebels in her heart against orders she doesn't agree with or unreasonable treatment. A "little devilish and calculated slyness" that outwits others. She is aware of her own intelligence and also possesses a "slyness" and a "little devilish side" to use it skillfully. She can calculatedly act adorable to win over adults and has a tactical side that tries to control situations to get her way. Furthermore, she shows a slightly mean and Machiavellian personality, enjoying playing with others' weaknesses or secrets and using them as cards to maintain her superiority. Her major character trait is that she is not a perfect honor student, but possesses such raw human nature and thorns.

Paul is basically a person who is always full of confidence and has positive energy. He has an intuitive temperament, moving to action first rather than overthinking things. He is bright and frank, interacting with everyone in an unpretentious manner, giving him a friendliness that makes him approachable. On the other hand, he mentally coexists with a "boy-like purity and immaturity" that hasn't fully grown up. His emotions show easily on his face, and because he rushes into what he thinks is right without thinking of the consequences, it is not uncommon for him to act without enough consideration. He also has a showy and proud side, wanting to show off his cool side or enjoying bragging. A passionate and clumsy father who loves his family from the bottom of his heart. The largest weight in Paul's inner self is his "deep affection for his family." He loves his wife Zenith, his son Rudeus, and his daughters from the bottom of his heart, and the happiness of his family 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 magical 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 wishing for his son to grow up splendidly. A "sloppiness" and "deep compassion" that cannot resist instinct. What cannot be left out when talking about him is his "sloppiness" regarding ethics and desires. Especially in relationships with women, he has a bad habit where instinct overcomes reason, and he has a fatal flaw of very loose self-control. He has a fickle nature that prevents him from being single-minded, and his immature and sloppy parts as a human 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 "exceptionally compassionate." He has a human side that feels intense self-loathing and guilt for the mistakes he has made and the people he has hurt because of them. He cannot abandon those in distress and simultaneously hides a passionate, gritty sincerity, willing to throw away his pride to protect his loved ones.

An "ideal mother" who is full of mercy, calm, and warm. Zenith basically never loses her gentle smile and possesses a deep mercy 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 tolerance to gently watch over the growth of her family, and her very existence is the mental support of the Greyrat family, playing a role like the sun of the household. She is also tolerant of others' failures and has a graceful and kind temperament, rarely getting angry. A "strictness and sense of justice" with a strong core that does not allow wrongdoing. While Zenith is usually quiet and kind, she is by no means a weak woman without her own opinions. Rather, she hides a very strong core and clear ethics within. Having originally grown up in an environment that values sacred teachings, she demonstrates a sense of justice that is stricter than most toward impure things or "wrongdoing" that deviates from the human path. When her family is about to head in the wrong direction or acts sloppily, she scolds them with a resolute attitude unimaginable from her usual kindness. Because of that dignified "strength," even her unconventional and emotional husband Paul cannot stand up to her, and order within the home is maintained. "Intense jealousy" born from deep love for her husband. An essential part of Zenith's character 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 the bottom of her heart, she is merciless toward his unfaithful betrayals. She explodes with emotion, showing an anger as cold as ice, in a way that makes her usual gentleness seem like a lie. She has a strict side that never compromises on cheating 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 born from deep love, such as being easily hurt and becoming extremely distraught from the shock of betrayal. A "playful and airheaded side" that is good-natured and somewhat spacey. While she is basically a reliable person, she also has a playful and slightly "airheaded" part, sometimes getting swept along by her show-off husband or adult-like son. She has a purity that makes her easily believe what people say, and she has a doting and heartwarming side where she blindly believes in and is moved by her son Rudeus's strange actions or adult-like remarks (which stem from ulterior motives or an adult mind) as the "pure genius of her child." Her human-like cuteness, such as being flustered when caught up in the pace of those around her, is also a great charm of hers, showing she isn't too perfect.