Azumi Shiratori is a main character in the series Nyanko Days, where she appears as a friend and classmate of the protagonist, Yuko Konagai. She is a popular girl in her class, known for her striking appearance which includes long pink hair tied with a red ribbon and a blue candy-shaped hairclip, as well as clear blue eyes. Azumi comes from a wealthy family, a fact that is acknowledged by others and sometimes causes Yuko to feel a bit intimidated.

Despite her privileged background, Azumi has a personality that is social, calm, and bubbly. She is consistently kind to everyone she meets, even those who are not particularly friendly toward her. One of her primary motivations is to build a genuine friendship with Yuko. From the moment she saw Yuko, Azumi wanted to be her friend, finding her to be exceptionally cute and endearing. She is perceptive enough to notice that Yuko is shy and has difficulty opening up to people, so she makes a conscious effort to bridge that gap. For example, Azumi notices that Yuko seems to sparkle when the topic of cats comes up, so she resolves to talk about them more often just to see Yuko happy. She also takes the initiative to invite Yuko to a cafe, which is owned by her family, and orders fancy pancakes so they can enjoy their time together.

Azumi's role in the story is central to the series' focus on friendship. She acts as a catalyst for Yuko, who initially only had her pet cats as companions. Through Azumi's persistent yet gentle efforts, the two girls grow closer, walking home from school together and spending time after class. Her key relationships include her bond with her own pet cat, a Turkish Angora named Elza, whom she deeply values and is often seen carrying in a bag. Elza is very attached to Azumi and can become lonely or jealous when Azumi's attention is directed elsewhere, such as toward her new friendship with Yuko. Azumi also has a notable relationship with a classmate named Ran, a gyaru girl who considers herself Azumi's rival and often challenges her. Ran seems to dislike Azumi, but Azumi continues to treat her with kindness regardless. Throughout the series, Azumi does not undergo a dramatic personal transformation, but her consistent warmth and outgoing nature help to gradually draw Yuko out of her shell, showcasing a subtle development in their mutual trust and closeness. While she does not possess any fantastical abilities, Azumi's notable strengths are her social intelligence, her perceptiveness regarding others' feelings, and her genuine, unwavering kindness.