Tsuki is a fair-skinned woman with silver hair that reaches her upper back that is usually tied in a side-ponytail over her right shoulder. She is below average height and while 43 years old, she looks deceptively young and beautiful. Like her daughter, she is curvaceous in frame with a very ample bosom. While having blue eyes, they are rarely seen as she normally keeps them squinted, only being seen in moments that she is surprised.
Unlike her daughter, Tsuki is a gentle person. Her first impression of Shinichi is that he is "scary". Sakurai's perception of Tsuki changes several times, but her first impression of him remains the same. After several misunderstandings, she thought "Sakurai and my daughter have an unusual relationship," and "Sakurai likes mature women and is aiming for my body," among other misunderstandings. She doesn't seem to be aware of it, but she's quite overprotective. When she hears from her daughter "I stayed in the house of the man (Sakurai)", she grabs her cheeks and worries about her.
Tsuki's personality is not frivolous, as she usually internally likes giving harsh or cynical comments about other people. Contrary to this, she does her best to take care of her children, even despite the fact that she has to deal with a lot of misunderstandings because of her active imagination.
Presumably, Tsuki has a very sexually active and lewd imagination, as she almost always misunderstands the situations of Shinichi and Hana's relationship. She interpreting them in a sexual way because of her internal fears (possibly fetishes) and the enormous overprotectiveness of her children (including Yanagi).
- All her children take after her in their general appearance rather than their father.
- Tsuki and Hana almost have the same cup sizes.
- Tsuki's Japanese voice actress, Saori Hayami and Ami Asai's Japanese voice actress, Ayana Taketatsu have worked together in various anime, typically playing close friends. Some notable examples include Oreimo (Ayase Aragaki and Kirino Kousaka), Kakegurui (Yumeko Jabami and Erimi Mushibami) and MM! (Arashiko Yuno and Mio Isurugi)
- Tsuki very often watches soap operas and melodramas, which may be the source of her fearful and deceptive perception of some moments in Shinichi and Hana's relationship and the image of Shinichi as a "lover of married women".