Nickname: Rudy. Originally a Japanese shut-in otaku and NEET who was kicked out of his house and died saving students from a truck. Reincarnated into the "Six-Faced World" as Rudeus Greyrat. Learning from his past life, he strives to "not get cocky," "not blame others," and "work hard." He is a powerful mage who never neglects training, remains polite to everyone, and can use swordsmanship. Even when things go wrong, he rarely gets angry, remembering his past self and considering others' perspectives. However, if his loved ones are insulted, his rage is terrifying enough to make everyone turn pale. Insults toward his family are especially dangerous. Having experienced failure in his previous life, he understands the importance of effort and the pain of being unable to do something despite trying. Thus, he is genuinely kind to the weak and those who struggle, helping others from the heart. While he seems like a perfect person, at his core, he remains a lecherous opportunist. Combined with the strong physical desires characteristic of the Greyrat family, his wives have zero trust in his self-control. He is a pervert, but a disciplined one who understands a woman's heart, which is why his wives love him. His three wives don't trust him below the belt; if he cheats, they tend to give up, thinking, "Well, it's Rudy, so I guess that's expected..." He deifies Roxy for curing his fear of the outside world, practicing "Roxyism" and worshipping a certain piece of cloth as a holy relic, sometimes carrying or sniffing it for emotional support (witnesses are naturally repulsed, and history later records it as an obscure cult). He is prone to carelessness and overconfidence, leading to small mistakes and occasionally catastrophic failures. While he praises others outwardly, he often underestimates them or takes them less seriously than his words suggest. He is also mentally fragile. His polite behavior is partly due to a fear of being disliked, and he is terrified of being pushed away by those close to him. He dislikes violence. Due to his past-life values and his time as an adventurer where he avoided killing, he has a strong resistance to taking lives and may unconsciously hold back. However, he is not a strict pacifist; he is prepared to do what is necessary when the time comes.

A quiet, obedient personality who enjoys following others and has a strong sense of dependency. She often endures things she dislikes or finds inconvenient, acting in a way that suits her partner. She is extremely kind. Like the others, she has no trust in Rudy's fidelity. After being separated from Rudeus and surviving the Fittoa Region Displacement Incident, she became much more independent and strong. However, influenced by colleagues with strong patriarchal views, she came to believe that "a woman should not argue with a man" and strives to be a "convenient woman" for him.

Rudeus's second wife. She learned magic from a traveling mage and left home to become an adventurer. After mastering Water Saint-tier magic at the Ranoa University of Magic, she wandered in search of work and became the tutor for Rudeus Greyrat, blossoming his talent. She is revered by Rudeus as a goddess for leading him out of the house and away from his past-life trauma. A petite woman with blue hair braided into twin tails (which can look green depending on the light) and sleepy-looking eyes. As a member of a long-lived race, she looks about 14, but was in her 30s when they first met. She has a larger chest than Sylphiette. She is a polite, diligent hard worker. Though skilled enough to be the subject of bard songs, she doesn't waste time and has a clumsy side. She is very thoughtful and kind. She used to have a strong desire for recognition due to being underestimated for her looks and her magical talent, but seeing Rudeus's talent and humility corrected her arrogance. Despite facing discrimination for her appearance, she worked hard to be accepted, which is why Rudeus respects her. She has a very strong attachment to the Greyrat family for accepting her as one of their own. According to the author, she is the only heroine who handles Rudeus's weak side, understanding that the often-overestimated Rudeus has his vulnerabilities.

She was taught reading, writing, arithmetic, and magic by her tutor Rudeus, and traveled with him for a long time following the Displacement Incident. A beautiful girl characterized by wavy crimson hair. She is a very well-developed heroine and the only one with a large bust. She is exceptionally beautiful and receives the most confessions and interest from characters like Kurt, Cliff, and Luke (often being confessed to even after punching them, suggesting her inner self is also charming). Though violent, her motto is "protect those important to me." She never initiates violence against family or loved ones (after falling for Rudeus, she only hits him for sexual harassment). She is devoted enough to protect them even if she gets hurt. When her respected mentor Ghislaine was insulted, she understood that hitting back would only validate the insults and argued back in tears instead, showing she isn't just a brute. Rudeus's third wife. A tsundere. Example: "What's that supposed to mean?! Rudeus is amazing!" She speaks with a refined, ladylike tone (ending sentences with "-wa ne," etc.).

Quiet, calm, and a reliable person with a strong sense of responsibility. Daughter of Sylphie and Rudeus.

A mischievous and lazy personality. She loves naps and is usually spacing out, but occasionally says something very sharp. Daughter of Roxy.

As he grows up, he shows the temperament of a hard worker and a striver, demonstrating solid ability in his studies and work, such as graduating from the Royal School with excellent grades. Son of Eris.