Supporting characters Aunt Nakahara
Sunako's aunt (addressed as Oba-san or "Auntie"), who expects Kyohei, Takenaga, Yuki, and Ranmaru to make Sunako into a lady. Called the "infamous of the East", Miss Nakahara is extremely wealthy and usually travels in unconventional fashion, such as in a fleet of . The Landlady is rarely around (usually in with her latest boyfriend or fiancé) and the four males have managed to convince her that Sunako is on the fast track to becoming a lady when really her niece is not. However, the Landlady has also been known to make unexpected visits, which often leads to the boys putting on an act of some sort with Sunako to make her appear more ladylike and, occasionally, resulting in raised rent when all does not go as planned.
The Landlady is actually the younger sister of Sunako's father and, like her niece, requires very little effort to frighten the boys. It is known that her husband is dead and the apparent reason why she keeps getting a new boyfriend is that she is lonely, but she loves none of these men in the same way she loved her husband. While their interaction is relatively limited, Sunako actually admires her aunt a great deal and considers her the most beautiful woman she knows; the Landlady, in turn, simply wants Sunako to be happy and believes that helping her niece become a lady will do so, especially since as a child Sunako always wanted to be like her aunt. She gradually turns her focus away from trying to shape Sunako into an elegant lady, believing that Sunako is perfectly capable of acting as such, and attempting to change Kyohei into a suitable partner for her niece. She has been shown to be fluent in various languages like French, Russian, and Tagalog.
In the live-action series, her name is Mine Nakahara and she has a son.
Takeru Nakahara
Takeru Nakahara (中原 タケル Nakahara Takeru) is the Landlady's son and Sunako's cousin. Unlike most children his age, Takeru has a courageous personality (although he can be frightened as well). He only appears in the drama.
Noi Kasahara
Noi Kasahara (笠原 乃依 Kasahara Noi) is a very pretty and exceedingly popular girl who becomes Sunako's closest female friend at school. She loves being called beautiful by the others, especially Sunako. She admires Sunako's tough attitude and is often very protective of her when someone insults her. She believes that Sunako and Kyohei are compatible as a couple. Noi is in love with Takenaga, though she tends to be insecure about their relationship because Takenaga is too shy to openly admit that he likes her. As stated in recent chapters, she's a fan of shoujo manga.
Hiroshi-kun
Hiroshi-kun is an , Sunako's most precious possession and best friend. Sunako often confides in him regarding her feelings about the boys and situations, although she does not get a reply. Despite not being alive, Hiroshi-kun is treated like a living person, narrating the opening of each anime episode, and dancing during in the anime's end credits. Hiroshi-kun was found by Sunako in a pile of rubbish shortly after she was described as being ugly by her first crush, and she formed a bond with Hiroshi-kun, both being "discarded" from the world.
Sunako takes good care of Hiroshi-kun, along with her other anatomical friends (Josephine, Akira-kun, and Sergeant George). His fake organs have a habit of falling out or being removed by Sunako. The boys at first are dismissive of Sunako's relationship with Hiroshi-kun, but eventually come to accept it over the course of the manga and anime, treating him the same way Sunako does but remembering that he is not alive. On several occasions, Hiroshi-kun is kidnapped by other characters and held to ransom. These characters include The Boss so he could meet Sunako, and a trio of obsessive fan girls of Kyouhei, which results in Sunako risking life and limb to save Hiroshi-kun.
Tamao Kikunoi
Tamao Kikunoi (菊之井 玉绪 Kikunoi Tamao) is the fiancée of Ranmaru because of an arranged marriage by both their parents. She is extremely wealthy and studies at an all-girls school. Aside from hoping Tamao's calm demeanor will change Ranmaru's womanizing habits, both Ranmaru's parents are extremely fond of her and would like her to become their daughter-in-law. Her character is a perfect example of a "lady" as she foils Noi's loud mouth and Sunako's un-ladylike nature. In her first meeting with the boys, she is unfazed by any of their attempts to portray Ranmaru as a ladies' man or someone undesirable. Despite Ranmaru's playboy qualities, she has fallen in love with him, to the extent of admitting her feelings. His rejection of her does not faze her, hoping that eventually he would come to feel the same way.
Sebastian
Sebastian is the Landlady's butler, and is often seen when the Landlady returns to the mansion, often assisting in her schemes towards the four boys and Sunako. Despite her outwardly not showing it, the Landlady cares for Sebastian greatly, as seen when she gave him time off in care for his health, albeit in a roundabout way. Sebastian is shown to be very devoted to the Landlady, often putting up with her many extravagant actions, and when not service the Landlady, is shown to be at a loss over what to do. He has been serving the Landlady for a long while, and is presumed to have known her deceased husband as well.
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