Azu Niisato is a 15-year-old high school student intensely focused on fashion and cosmetics. She constantly tracks trends and gathers information via social media, a dedication reflected in her appearance. Her distinctive witch attire often includes a purple and black short kimono with a red ribbon, a white shirt, purple-lined socks, a white hat, and purple kimono shoes.

Her personality is marked by intense preferences and a notably sharp tongue. Azu openly expresses strong likes and dislikes and can be perceived as foul-mouthed or difficult. Moments of selfishness are indicated to stem from underlying, undisclosed reasons. Despite these traits, she exhibits significant passion and determination, particularly regarding her training as a witch. Her primary motivation is completing this training to fulfill her greatest wish, displaying more enthusiasm for this goal than her peers.

Azu's daily life centers on exploring fashion trends and skincare routines. She actively searches for affordable alternatives to expensive cosmetics, turning this pursuit into a dedicated hobby. Her personal tastes include enjoying cream puffs while disliking sweet red bean paste.

Character development unfolds through her experiences. Exploration of her backstory reveals the circumstances of her recruitment by Keroppe, addressing themes of body positivity and self-image. Her growth is portrayed as gradual and realistic; she does not immediately become comfortable with her appearance or open to trusting the other witches. The process emphasizes that building self-confidence takes time and effort, further contextualized through interactions like encountering a plus-sized visitor at the flower shop.

Her physical attributes are a height of 152.5 cm, a birthday on September 15, and blood type A.